From 62df42f892328debb1592b5b247f46af55d648da Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Wed, 29 Jul 2026 17:01:39 +0000
Subject: [PATCH 1/5] Add example UDL federation plugin (ephemeris +
 conjunction assessments)

Co-Authored-By: Jake Cosme <jake@cognition.ai>
---
 .../udlFederation/ConjunctionLimitProvider.js |  87 ++++++++++++
 example/udlFederation/UDLObjectProvider.js    | 131 ++++++++++++++++++
 example/udlFederation/UDLTelemetryProvider.js | 124 +++++++++++++++++
 example/udlFederation/plugin.js               |  72 ++++++++++
 example/udlFederation/satellites.js           |  59 ++++++++
 index.html                                    |   1 +
 src/plugins/plugins.js                        |   2 +
 7 files changed, 476 insertions(+)
 create mode 100644 example/udlFederation/ConjunctionLimitProvider.js
 create mode 100644 example/udlFederation/UDLObjectProvider.js
 create mode 100644 example/udlFederation/UDLTelemetryProvider.js
 create mode 100644 example/udlFederation/plugin.js
 create mode 100644 example/udlFederation/satellites.js

diff --git a/example/udlFederation/ConjunctionLimitProvider.js b/example/udlFederation/ConjunctionLimitProvider.js
new file mode 100644
index 0000000000..241246e30e
--- /dev/null
+++ b/example/udlFederation/ConjunctionLimitProvider.js
@@ -0,0 +1,87 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2024, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+// Screening thresholds commonly used for conjunction assessment triage.
+const PC_CRITICAL = 1e-4;
+const PC_WARNING = 1e-5;
+
+const LIMITS = {
+  critical: {
+    cssClass: 'is-limit--upr is-limit--red',
+    low: PC_CRITICAL,
+    high: Number.POSITIVE_INFINITY,
+    name: 'Pc Critical'
+  },
+  warning: {
+    cssClass: 'is-limit--upr is-limit--yellow',
+    low: PC_WARNING,
+    high: PC_CRITICAL,
+    name: 'Pc Warning'
+  }
+};
+
+export default class ConjunctionLimitProvider {
+  supportsLimits(domainObject) {
+    return domainObject.type === 'udl.conjunctions';
+  }
+
+  getLimitEvaluator() {
+    return {
+      evaluate: function (datum, valueMetadata) {
+        if (!valueMetadata || valueMetadata.key !== 'pc') {
+          return undefined;
+        }
+
+        if (datum.pc >= PC_CRITICAL) {
+          return LIMITS.critical;
+        }
+
+        if (datum.pc >= PC_WARNING) {
+          return LIMITS.warning;
+        }
+
+        return undefined;
+      }
+    };
+  }
+
+  getLimits() {
+    return {
+      limits: function () {
+        return Promise.resolve({
+          WARNING: {
+            high: {
+              color: 'yellow',
+              pc: PC_WARNING
+            }
+          },
+          CRITICAL: {
+            high: {
+              color: 'red',
+              pc: PC_CRITICAL
+            }
+          }
+        });
+      }
+    };
+  }
+}
diff --git a/example/udlFederation/UDLObjectProvider.js b/example/udlFederation/UDLObjectProvider.js
new file mode 100644
index 0000000000..d1db456af5
--- /dev/null
+++ b/example/udlFederation/UDLObjectProvider.js
@@ -0,0 +1,131 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2024, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+import { SATELLITES } from './satellites.js';
+
+const EPHEMERIS_VALUES = [
+  {
+    key: 'utc',
+    source: 'utc',
+    name: 'Timestamp',
+    format: 'utc',
+    hints: { domain: 1 }
+  },
+  {
+    key: 'altitude',
+    name: 'Altitude',
+    unit: 'km',
+    format: 'float',
+    hints: { range: 1 }
+  },
+  {
+    key: 'latitude',
+    name: 'Latitude',
+    unit: 'deg',
+    format: 'float',
+    hints: { range: 2 }
+  },
+  {
+    key: 'longitude',
+    name: 'Longitude',
+    unit: 'deg',
+    format: 'float',
+    hints: { range: 3 }
+  },
+  {
+    key: 'velocity',
+    name: 'Velocity',
+    unit: 'km/s',
+    format: 'float',
+    hints: { range: 4 }
+  }
+];
+
+const CONJUNCTION_VALUES = [
+  {
+    key: 'utc',
+    source: 'utc',
+    name: 'Timestamp',
+    format: 'utc',
+    hints: { domain: 1 }
+  },
+  {
+    key: 'pc',
+    name: 'Probability of Collision',
+    format: 'float',
+    hints: { range: 1 }
+  },
+  {
+    key: 'missDistance',
+    name: 'Miss Distance',
+    unit: 'km',
+    format: 'float',
+    hints: { range: 2 }
+  },
+  {
+    key: 'secondary',
+    name: 'Secondary Object',
+    format: 'string',
+    hints: { range: 3 }
+  }
+];
+
+export default class UDLObjectProvider {
+  get(identifier) {
+    if (identifier.key === 'node') {
+      return Promise.resolve({
+        identifier,
+        name: 'UDL Federation Node',
+        type: 'folder',
+        location: 'ROOT'
+      });
+    }
+
+    if (identifier.key === 'conjunctions') {
+      return Promise.resolve({
+        identifier,
+        name: 'Conjunction Assessments',
+        type: 'udl.conjunctions',
+        location: 'udl:node',
+        telemetry: {
+          values: CONJUNCTION_VALUES
+        }
+      });
+    }
+
+    const satellite = SATELLITES.find((candidate) => candidate.key === identifier.key);
+    if (satellite === undefined) {
+      return Promise.reject(new Error(`Unknown UDL object: ${identifier.key}`));
+    }
+
+    return Promise.resolve({
+      identifier,
+      name: satellite.name,
+      type: 'udl.ephemeris',
+      location: 'udl:node',
+      noradId: satellite.noradId,
+      telemetry: {
+        values: EPHEMERIS_VALUES
+      }
+    });
+  }
+}
diff --git a/example/udlFederation/UDLTelemetryProvider.js b/example/udlFederation/UDLTelemetryProvider.js
new file mode 100644
index 0000000000..a0b9693332
--- /dev/null
+++ b/example/udlFederation/UDLTelemetryProvider.js
@@ -0,0 +1,124 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2024, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+import { EARTH_RADIUS_KM, MU_EARTH, SATELLITES } from './satellites.js';
+
+const EPHEMERIS_PERIOD_MS = 1000;
+const CONJUNCTION_PERIOD_MS = 5000;
+const SECONDARY_OBJECTS = [
+  'COSMOS 2251 DEB',
+  'FENGYUN 1C DEB',
+  'SL-16 R/B',
+  'STARLINK-30452',
+  'IRIDIUM 33 DEB'
+];
+
+function ephemerisDatum(satellite, timestamp) {
+  const radiusKm = EARTH_RADIUS_KM + satellite.altitudeKm;
+  const periodSeconds = 2 * Math.PI * Math.sqrt(Math.pow(radiusKm, 3) / MU_EARTH);
+  const meanMotion = (2 * Math.PI) / periodSeconds;
+  const theta = meanMotion * (timestamp / 1000) + (satellite.phaseDeg * Math.PI) / 180;
+  const inclination = (satellite.inclinationDeg * Math.PI) / 180;
+
+  const latitude = (Math.asin(Math.sin(inclination) * Math.sin(theta)) * 180) / Math.PI;
+  const earthRotationDeg = ((timestamp / 1000) * 360) / 86164;
+  const longitude =
+    (((((Math.atan2(Math.cos(inclination) * Math.sin(theta), Math.cos(theta)) * 180) / Math.PI +
+      satellite.raanDeg -
+      earthRotationDeg) %
+      360) +
+      540) %
+      360) -
+    180;
+
+  return {
+    id: satellite.key,
+    utc: timestamp,
+    altitude: satellite.altitudeKm + Math.sin(theta * 3) * 2,
+    latitude,
+    longitude,
+    velocity: Math.sqrt(MU_EARTH / radiusKm)
+  };
+}
+
+function conjunctionDatum(timestamp) {
+  const slot = Math.floor(timestamp / CONJUNCTION_PERIOD_MS);
+  const wave = Math.abs(Math.sin(slot / 7));
+  const pc = wave > 0.92 ? 0.0002 + wave / 2000 : wave / 50000;
+
+  return {
+    id: 'conjunctions',
+    utc: timestamp,
+    pc: Number(pc.toPrecision(3)),
+    missDistance: Number((0.4 + (1 - wave) * 24).toFixed(2)),
+    secondary: SECONDARY_OBJECTS[slot % SECONDARY_OBJECTS.length]
+  };
+}
+
+export default class UDLTelemetryProvider {
+  supportsRequest(domainObject) {
+    return this.#isUDLTelemetry(domainObject);
+  }
+
+  supportsSubscribe(domainObject) {
+    return this.#isUDLTelemetry(domainObject);
+  }
+
+  request(domainObject, options) {
+    const period =
+      domainObject.type === 'udl.conjunctions' ? CONJUNCTION_PERIOD_MS : EPHEMERIS_PERIOD_MS;
+    const start = Math.floor(options.start / period) * period;
+    const data = [];
+
+    for (let timestamp = start; timestamp <= options.end; timestamp += period) {
+      data.push(this.#datumFor(domainObject, timestamp));
+    }
+
+    return Promise.resolve(data);
+  }
+
+  subscribe(domainObject, callback) {
+    const period =
+      domainObject.type === 'udl.conjunctions' ? CONJUNCTION_PERIOD_MS : EPHEMERIS_PERIOD_MS;
+    const interval = setInterval(() => {
+      callback(this.#datumFor(domainObject, Date.now()));
+    }, period);
+
+    return function unsubscribe() {
+      clearInterval(interval);
+    };
+  }
+
+  #datumFor(domainObject, timestamp) {
+    if (domainObject.type === 'udl.conjunctions') {
+      return conjunctionDatum(timestamp);
+    }
+
+    const satellite = SATELLITES.find((candidate) => candidate.key === domainObject.identifier.key);
+
+    return ephemerisDatum(satellite, timestamp);
+  }
+
+  #isUDLTelemetry(domainObject) {
+    return domainObject.type === 'udl.ephemeris' || domainObject.type === 'udl.conjunctions';
+  }
+}
diff --git a/example/udlFederation/plugin.js b/example/udlFederation/plugin.js
new file mode 100644
index 0000000000..b18a726419
--- /dev/null
+++ b/example/udlFederation/plugin.js
@@ -0,0 +1,72 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2024, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+import ConjunctionLimitProvider from './ConjunctionLimitProvider.js';
+import { SATELLITES } from './satellites.js';
+import UDLObjectProvider from './UDLObjectProvider.js';
+import UDLTelemetryProvider from './UDLTelemetryProvider.js';
+
+/**
+ * Simulated Unified Data Library (UDL) federation node. Exposes a
+ * constellation's ephemeris streams and a conjunction-assessment feed the way
+ * a UDL data-integration node would federate them into a mission-ops tool.
+ */
+export default function UDLFederationPlugin() {
+  return function install(openmct) {
+    openmct.types.addType('udl.ephemeris', {
+      name: 'UDL Ephemeris',
+      description: 'Satellite state vectors federated from a Unified Data Library node.',
+      cssClass: 'icon-telemetry'
+    });
+
+    openmct.types.addType('udl.conjunctions', {
+      name: 'UDL Conjunction Assessments',
+      description:
+        'Conjunction data messages federated from a Unified Data Library node, with probability-of-collision screening limits.',
+      cssClass: 'icon-alert-triangle'
+    });
+
+    openmct.objects.addRoot({
+      namespace: 'udl',
+      key: 'node'
+    });
+
+    openmct.objects.addProvider('udl', new UDLObjectProvider());
+
+    openmct.composition.addProvider({
+      appliesTo: function (domainObject) {
+        return domainObject.identifier.namespace === 'udl' && domainObject.type === 'folder';
+      },
+      load: function () {
+        return Promise.resolve(
+          SATELLITES.map((satellite) => ({
+            namespace: 'udl',
+            key: satellite.key
+          })).concat([{ namespace: 'udl', key: 'conjunctions' }])
+        );
+      }
+    });
+
+    openmct.telemetry.addProvider(new UDLTelemetryProvider());
+    openmct.telemetry.addProvider(new ConjunctionLimitProvider());
+  };
+}
diff --git a/example/udlFederation/satellites.js b/example/udlFederation/satellites.js
new file mode 100644
index 0000000000..024cf5c3cd
--- /dev/null
+++ b/example/udlFederation/satellites.js
@@ -0,0 +1,59 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2024, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+/**
+ * Simulated constellation for the UDL federation node. Orbital parameters are
+ * simplified two-body circular orbits, sufficient for a representative
+ * ephemeris stream (UDL `elset`/`statevector` analog).
+ */
+export const SATELLITES = [
+  {
+    key: 'gps-iii-sv05',
+    name: 'GPS III SV05 (NAVSTAR 82)',
+    noradId: 48859,
+    altitudeKm: 20180,
+    inclinationDeg: 55,
+    raanDeg: 40,
+    phaseDeg: 0
+  },
+  {
+    key: 'wgs-11',
+    name: 'WGS-11',
+    noradId: 54800,
+    altitudeKm: 35786,
+    inclinationDeg: 0.02,
+    raanDeg: 0,
+    phaseDeg: 130
+  },
+  {
+    key: 'sbirs-geo-6',
+    name: 'SBIRS GEO-6 (USA 336)',
+    noradId: 53355,
+    altitudeKm: 35786,
+    inclinationDeg: 1.4,
+    raanDeg: 0,
+    phaseDeg: 245
+  }
+];
+
+export const EARTH_RADIUS_KM = 6371;
+export const MU_EARTH = 398600.4418; // km^3/s^2
diff --git a/index.html b/index.html
index 42417f0022..001972ddc8 100644
--- a/index.html
+++ b/index.html
@@ -105,6 +105,7 @@
       openmct.install(openmct.plugins.example.EventGeneratorPlugin());
       openmct.install(openmct.plugins.example.ExampleImagery());
       openmct.install(openmct.plugins.example.ExampleTags());
+      openmct.install(openmct.plugins.example.UDLFederation());
 
       openmct.install(openmct.plugins.Espresso());
       openmct.install(openmct.plugins.MyItems());
diff --git a/src/plugins/plugins.js b/src/plugins/plugins.js
index 938bc51c09..62f383d41f 100644
--- a/src/plugins/plugins.js
+++ b/src/plugins/plugins.js
@@ -28,6 +28,7 @@ import ExampleUser from '../../example/exampleUser/plugin.js';
 import ExampleFaultSource from '../../example/faultManagement/exampleFaultSource.js';
 import GeneratorPlugin from '../../example/generator/plugin.js';
 import ExampleImagery from '../../example/imagery/plugin.js';
+import UDLFederationPlugin from '../../example/udlFederation/plugin.js';
 import AutoflowPlugin from './autoflow/AutoflowTabularPlugin.js';
 import BarChartPlugin from './charts/bar/plugin.js';
 import ScatterPlotPlugin from './charts/scatter/plugin.js';
@@ -105,6 +106,7 @@ plugins.example.ExampleDataVisualizationSourcePlugin = ExampleDataVisualizationS
 plugins.example.ExampleTags = ExampleTags;
 plugins.example.Generator = () => GeneratorPlugin;
 plugins.example.ExampleStaleness = ExampleStaleness;
+plugins.example.UDLFederation = UDLFederationPlugin;
 
 plugins.UTCTimeSystem = UTCTimeSystem;
 plugins.LocalTimeSystem = LocalTimeSystem;

From 29cb665981d73c20aa7e4f5bbb27b8814d5693a6 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Wed, 29 Jul 2026 17:09:46 +0000
Subject: [PATCH 2/5] Address review feedback: cspell words, formatString
 metadata, bounded request size

Co-Authored-By: Jake Cosme <jake@cognition.ai>
---
 .cspell.json                                  | 10 +++-
 example/udlFederation/UDLObjectProvider.js    | 14 +++---
 example/udlFederation/UDLTelemetryProvider.js | 11 ++++-
 test-plan-udl.md                              | 25 ++++++++++
 test-report.md                                | 48 +++++++++++++++++++
 5 files changed, 97 insertions(+), 11 deletions(-)
 create mode 100644 test-plan-udl.md
 create mode 100644 test-report.md

diff --git a/.cspell.json b/.cspell.json
index f8710f7fc7..8b99ef2db1 100644
--- a/.cspell.json
+++ b/.cspell.json
@@ -489,7 +489,15 @@
     "requestfinished",
     "LOCF",
     "Unack",
-    "Tabnabbing"
+    "Tabnabbing",
+    "elset",
+    "statevector",
+    "NAVSTAR",
+    "raan",
+    "sbirs",
+    "SBIRS",
+    "FENGYUN",
+    "STARLINK"
   ],
   "dictionaries": ["npm", "softwareTerms", "node", "html", "css", "bash", "en_US", "en-gb", "misc"],
   "ignorePaths": [
diff --git a/example/udlFederation/UDLObjectProvider.js b/example/udlFederation/UDLObjectProvider.js
index d1db456af5..ac408f12fa 100644
--- a/example/udlFederation/UDLObjectProvider.js
+++ b/example/udlFederation/UDLObjectProvider.js
@@ -34,28 +34,28 @@ const EPHEMERIS_VALUES = [
     key: 'altitude',
     name: 'Altitude',
     unit: 'km',
-    format: 'float',
+    formatString: '%0.2f',
     hints: { range: 1 }
   },
   {
     key: 'latitude',
     name: 'Latitude',
     unit: 'deg',
-    format: 'float',
+    formatString: '%0.4f',
     hints: { range: 2 }
   },
   {
     key: 'longitude',
     name: 'Longitude',
     unit: 'deg',
-    format: 'float',
+    formatString: '%0.4f',
     hints: { range: 3 }
   },
   {
     key: 'velocity',
     name: 'Velocity',
     unit: 'km/s',
-    format: 'float',
+    formatString: '%0.3f',
     hints: { range: 4 }
   }
 ];
@@ -71,21 +71,19 @@ const CONJUNCTION_VALUES = [
   {
     key: 'pc',
     name: 'Probability of Collision',
-    format: 'float',
     hints: { range: 1 }
   },
   {
     key: 'missDistance',
     name: 'Miss Distance',
     unit: 'km',
-    format: 'float',
+    formatString: '%0.2f',
     hints: { range: 2 }
   },
   {
     key: 'secondary',
     name: 'Secondary Object',
-    format: 'string',
-    hints: { range: 3 }
+    format: 'string'
   }
 ];
 
diff --git a/example/udlFederation/UDLTelemetryProvider.js b/example/udlFederation/UDLTelemetryProvider.js
index a0b9693332..91c66f1a3e 100644
--- a/example/udlFederation/UDLTelemetryProvider.js
+++ b/example/udlFederation/UDLTelemetryProvider.js
@@ -24,6 +24,7 @@ import { EARTH_RADIUS_KM, MU_EARTH, SATELLITES } from './satellites.js';
 
 const EPHEMERIS_PERIOD_MS = 1000;
 const CONJUNCTION_PERIOD_MS = 5000;
+const MAX_REQUEST_DATUMS = 50000;
 const SECONDARY_OBJECTS = [
   'COSMOS 2251 DEB',
   'FENGYUN 1C DEB',
@@ -86,9 +87,15 @@ export default class UDLTelemetryProvider {
   request(domainObject, options) {
     const period =
       domainObject.type === 'udl.conjunctions' ? CONJUNCTION_PERIOD_MS : EPHEMERIS_PERIOD_MS;
-    const start = Math.floor(options.start / period) * period;
-    const data = [];
+    const size = options.size ?? MAX_REQUEST_DATUMS;
+    let start = Math.floor(options.start / period) * period;
+    const requestedCount = Math.floor((options.end - start) / period) + 1;
+
+    if (requestedCount > size) {
+      start = options.end - (size - 1) * period;
+    }
 
+    const data = [];
     for (let timestamp = start; timestamp <= options.end; timestamp += period) {
       data.push(this.#datumFor(domainObject, timestamp));
     }
diff --git a/test-plan-udl.md b/test-plan-udl.md
new file mode 100644
index 0000000000..394875faf2
--- /dev/null
+++ b/test-plan-udl.md
@@ -0,0 +1,25 @@
+# Test Plan: UDL Federation example plugin (PR #14)
+
+App: http://localhost:8080 (webpack dev server, branch devin/1785344499-udl-federation-plugin). Record the run.
+
+## Test 1: It should show UDL Federation Node tree with 3 satellites + Conjunction Assessments
+- Expand "UDL Federation Node" root in left tree.
+- PASS: children exactly: "GPS III SV05 (NAVSTAR 82)", "WGS-11", "SBIRS GEO-6 (USA 336)", "Conjunction Assessments".
+
+## Test 2: It should render live-updating ephemeris plot for a satellite
+- Click GPS III SV05. Expect a plot view with series (Altitude ~20180 km ±2, plus lat/lon/velocity).
+- Switch time conductor to Real-Time (local clock) mode; wait ~10s.
+- PASS: plot renders data (non-empty line), new points appear at right edge over time (compare two screenshots ~10s apart).
+
+## Test 3: It should plot Pc values and highlight limit rows in telemetry table
+- Click Conjunction Assessments: plot shows Pc values (mostly <2e-5, occasional spikes ≥2e-4).
+- Switch view to "Telemetry Table" via view switcher (top right).
+- PASS: table shows rows with Timestamp, Probability of Collision, Miss Distance, Secondary Object columns; rows with pc ≥1e-4 highlighted red (is-limit--red), 1e-5≤pc<1e-4 yellow. Widen historical window if needed to capture a spike (pc spikes when |sin(slot/7)|>0.92, slot=5s buckets, so spikes occur in bursts every ~110s — a 30+ min historical window guarantees several).
+
+## Test 4: It should produce no console errors from the plugin
+- Check browser console after above interactions.
+- PASS: no uncaught errors/warnings referencing udlFederation files.
+
+## Test 5 (Regression): existing objects still work
+- Create > Sine Wave Generator into My Items; open it.
+- PASS: object created and plot renders.
diff --git a/test-report.md b/test-report.md
new file mode 100644
index 0000000000..bc51d6baab
--- /dev/null
+++ b/test-report.md
@@ -0,0 +1,48 @@
+# Test Report — PR #14: UDL Federation example plugin
+
+Tested end-to-end in the browser against the local webpack dev server (`npm start`, http://localhost:8080) on branch `devin/1785344499-udl-federation-plugin` (HEAD 62df42f). Recording: `/home/ubuntu/screencasts/rec-07188730-0284-41ec-8f54-9a65314a7790/rec-07188730-0284-41ec-8f54-9a65314a7790-edited.mp4`.
+
+## Results
+
+| # | Test | Result |
+|---|------|--------|
+| 1 | Tree shows UDL Federation Node with 3 satellites + Conjunction Assessments | ✅ Passed |
+| 2 | Satellite ephemeris plot renders and streams live in Real-Time mode | ✅ Passed |
+| 3 | Conjunction Assessments plots Pc; telemetry table highlights limit rows (red ≥1e-4, yellow ≥1e-5) | ✅ Passed |
+| 4 | No console errors from the plugin | ✅ Passed |
+| 5 | Regression: Sine Wave Generator create + plot still works | ✅ Passed |
+
+## Evidence
+
+### 1. Root node and children
+Tree and Grid View show exactly: GPS III SV05 (NAVSTAR 82), WGS-11, SBIRS GEO-6 (USA 336) (all UDL Ephemeris) and Conjunction Assessments (UDL Conjunction Assessments).
+
+| Tree (zoom) | Grid View |
+|---|---|
+| ![Tree](https://app.devin.ai/attachments/0cd84fa7-e148-40b7-b220-b34382e86d90/ss_zoom_c74004fe.png) | ![Grid](https://app.devin.ai/attachments/51f780b0-67f9-4fec-bb01-b40d6feb123b/ss_93d8323d.png) |
+
+### 2. Live ephemeris plot (GPS III SV05)
+Altitude plots ~20181.8–20182 km (matches simulated 20180 km ±2 wobble); Latitude/Longitude/Velocity available as series options. After switching the time conductor to Real-Time (Local Clock), the plot right edge advanced each second (axis extended 17:04 → 17:06 during observation, "Last update" ticking).
+
+| Fixed timespan plot | Real-Time mode streaming (axis extended, new points at right edge) |
+|---|---|
+| ![Fixed](https://app.devin.ai/attachments/6ae57317-142b-4bac-aa29-6539780e4368/ss_217a2175.png) | ![Realtime](https://app.devin.ai/attachments/5a1bc27c-92ea-4e5f-9821-f17fd1a81550/ss_3eb63459.png) |
+
+### 3. Conjunction Assessments — Pc plot and limit highlighting
+Pc plot shows baseline values <2e-5 with periodic spikes up to ~7e-4. Telemetry Table view highlights Probability of Collision cells: **red** for Pc ≥ 1e-4 (e.g. 0.000679, 0.000694, 0.0007), **yellow** for 1e-5 ≤ Pc < 1e-4 (e.g. 0.0000107–0.0000183), no highlight below 1e-5 (e.g. 0.00000549). Rows carry Miss Distance (km) and Secondary Object (debris/RB names).
+
+| Pc plot | Table limit highlighting (zoom) |
+|---|---|
+| ![Pc plot](https://app.devin.ai/attachments/8aa3239f-53be-4423-aacd-d7a1ff2922fd/ss_14ad1a8d.png) | ![Table limits](https://app.devin.ai/attachments/9cd36722-c472-423d-9906-93eef5f53518/ss_zoom_fe05ab94.png) |
+
+### 4. Console
+After a fresh page reload and interacting with all UDL objects, the console contained no errors. Only pre-existing noise: a Vue `defineExpose()` compiler-hint warning from `AppLayout/StatusIndicators` (present on master, unrelated to plugin) and webpack-dev-server/HMR info logs.
+
+### 5. Regression — Sine Wave Generator
+Created via Create > Sine Wave Generator into My Items; plot renders live sine data in Real-Time mode.
+
+![Sine regression](https://app.devin.ai/attachments/d5d489cf-400b-4a26-a8e9-6a09b68535b9/ss_f6064aaa.png)
+
+## Notes
+- The limit thresholds observed in the table match `ConjunctionLimitProvider.js` (PC_CRITICAL=1e-4 red, PC_WARNING=1e-5 yellow).
+- No issues found.

From 5a0bdcbaad6e4de136fa7071a519ca27048334a2 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Wed, 29 Jul 2026 17:16:49 +0000
Subject: [PATCH 3/5] Down-sample bounded requests across full window; drop
 test artifacts; add norad to cspell

Co-Authored-By: Jake Cosme <jake@cognition.ai>
---
 .cspell.json                                  |  4 +-
 example/udlFederation/UDLTelemetryProvider.js | 12 ++---
 test-plan-udl.md                              | 25 ----------
 test-report.md                                | 48 -------------------
 4 files changed, 8 insertions(+), 81 deletions(-)
 delete mode 100644 test-plan-udl.md
 delete mode 100644 test-report.md

diff --git a/.cspell.json b/.cspell.json
index 8b99ef2db1..2bd524dbdd 100644
--- a/.cspell.json
+++ b/.cspell.json
@@ -497,7 +497,9 @@
     "sbirs",
     "SBIRS",
     "FENGYUN",
-    "STARLINK"
+    "STARLINK",
+    "norad",
+    "NORAD"
   ],
   "dictionaries": ["npm", "softwareTerms", "node", "html", "css", "bash", "en_US", "en-gb", "misc"],
   "ignorePaths": [
diff --git a/example/udlFederation/UDLTelemetryProvider.js b/example/udlFederation/UDLTelemetryProvider.js
index 91c66f1a3e..ad6db11679 100644
--- a/example/udlFederation/UDLTelemetryProvider.js
+++ b/example/udlFederation/UDLTelemetryProvider.js
@@ -88,16 +88,14 @@ export default class UDLTelemetryProvider {
     const period =
       domainObject.type === 'udl.conjunctions' ? CONJUNCTION_PERIOD_MS : EPHEMERIS_PERIOD_MS;
     const size = options.size ?? MAX_REQUEST_DATUMS;
-    let start = Math.floor(options.start / period) * period;
+    const start = Math.floor(options.start / period) * period;
     const requestedCount = Math.floor((options.end - start) / period) + 1;
-
-    if (requestedCount > size) {
-      start = options.end - (size - 1) * period;
-    }
+    const count = Math.min(requestedCount, size);
+    const step = count > 1 ? (options.end - start) / (count - 1) : period;
 
     const data = [];
-    for (let timestamp = start; timestamp <= options.end; timestamp += period) {
-      data.push(this.#datumFor(domainObject, timestamp));
+    for (let i = 0; i < count; i++) {
+      data.push(this.#datumFor(domainObject, start + Math.round(i * step)));
     }
 
     return Promise.resolve(data);
diff --git a/test-plan-udl.md b/test-plan-udl.md
deleted file mode 100644
index 394875faf2..0000000000
--- a/test-plan-udl.md
+++ /dev/null
@@ -1,25 +0,0 @@
-# Test Plan: UDL Federation example plugin (PR #14)
-
-App: http://localhost:8080 (webpack dev server, branch devin/1785344499-udl-federation-plugin). Record the run.
-
-## Test 1: It should show UDL Federation Node tree with 3 satellites + Conjunction Assessments
-- Expand "UDL Federation Node" root in left tree.
-- PASS: children exactly: "GPS III SV05 (NAVSTAR 82)", "WGS-11", "SBIRS GEO-6 (USA 336)", "Conjunction Assessments".
-
-## Test 2: It should render live-updating ephemeris plot for a satellite
-- Click GPS III SV05. Expect a plot view with series (Altitude ~20180 km ±2, plus lat/lon/velocity).
-- Switch time conductor to Real-Time (local clock) mode; wait ~10s.
-- PASS: plot renders data (non-empty line), new points appear at right edge over time (compare two screenshots ~10s apart).
-
-## Test 3: It should plot Pc values and highlight limit rows in telemetry table
-- Click Conjunction Assessments: plot shows Pc values (mostly <2e-5, occasional spikes ≥2e-4).
-- Switch view to "Telemetry Table" via view switcher (top right).
-- PASS: table shows rows with Timestamp, Probability of Collision, Miss Distance, Secondary Object columns; rows with pc ≥1e-4 highlighted red (is-limit--red), 1e-5≤pc<1e-4 yellow. Widen historical window if needed to capture a spike (pc spikes when |sin(slot/7)|>0.92, slot=5s buckets, so spikes occur in bursts every ~110s — a 30+ min historical window guarantees several).
-
-## Test 4: It should produce no console errors from the plugin
-- Check browser console after above interactions.
-- PASS: no uncaught errors/warnings referencing udlFederation files.
-
-## Test 5 (Regression): existing objects still work
-- Create > Sine Wave Generator into My Items; open it.
-- PASS: object created and plot renders.
diff --git a/test-report.md b/test-report.md
deleted file mode 100644
index bc51d6baab..0000000000
--- a/test-report.md
+++ /dev/null
@@ -1,48 +0,0 @@
-# Test Report — PR #14: UDL Federation example plugin
-
-Tested end-to-end in the browser against the local webpack dev server (`npm start`, http://localhost:8080) on branch `devin/1785344499-udl-federation-plugin` (HEAD 62df42f). Recording: `/home/ubuntu/screencasts/rec-07188730-0284-41ec-8f54-9a65314a7790/rec-07188730-0284-41ec-8f54-9a65314a7790-edited.mp4`.
-
-## Results
-
-| # | Test | Result |
-|---|------|--------|
-| 1 | Tree shows UDL Federation Node with 3 satellites + Conjunction Assessments | ✅ Passed |
-| 2 | Satellite ephemeris plot renders and streams live in Real-Time mode | ✅ Passed |
-| 3 | Conjunction Assessments plots Pc; telemetry table highlights limit rows (red ≥1e-4, yellow ≥1e-5) | ✅ Passed |
-| 4 | No console errors from the plugin | ✅ Passed |
-| 5 | Regression: Sine Wave Generator create + plot still works | ✅ Passed |
-
-## Evidence
-
-### 1. Root node and children
-Tree and Grid View show exactly: GPS III SV05 (NAVSTAR 82), WGS-11, SBIRS GEO-6 (USA 336) (all UDL Ephemeris) and Conjunction Assessments (UDL Conjunction Assessments).
-
-| Tree (zoom) | Grid View |
-|---|---|
-| ![Tree](https://app.devin.ai/attachments/0cd84fa7-e148-40b7-b220-b34382e86d90/ss_zoom_c74004fe.png) | ![Grid](https://app.devin.ai/attachments/51f780b0-67f9-4fec-bb01-b40d6feb123b/ss_93d8323d.png) |
-
-### 2. Live ephemeris plot (GPS III SV05)
-Altitude plots ~20181.8–20182 km (matches simulated 20180 km ±2 wobble); Latitude/Longitude/Velocity available as series options. After switching the time conductor to Real-Time (Local Clock), the plot right edge advanced each second (axis extended 17:04 → 17:06 during observation, "Last update" ticking).
-
-| Fixed timespan plot | Real-Time mode streaming (axis extended, new points at right edge) |
-|---|---|
-| ![Fixed](https://app.devin.ai/attachments/6ae57317-142b-4bac-aa29-6539780e4368/ss_217a2175.png) | ![Realtime](https://app.devin.ai/attachments/5a1bc27c-92ea-4e5f-9821-f17fd1a81550/ss_3eb63459.png) |
-
-### 3. Conjunction Assessments — Pc plot and limit highlighting
-Pc plot shows baseline values <2e-5 with periodic spikes up to ~7e-4. Telemetry Table view highlights Probability of Collision cells: **red** for Pc ≥ 1e-4 (e.g. 0.000679, 0.000694, 0.0007), **yellow** for 1e-5 ≤ Pc < 1e-4 (e.g. 0.0000107–0.0000183), no highlight below 1e-5 (e.g. 0.00000549). Rows carry Miss Distance (km) and Secondary Object (debris/RB names).
-
-| Pc plot | Table limit highlighting (zoom) |
-|---|---|
-| ![Pc plot](https://app.devin.ai/attachments/8aa3239f-53be-4423-aacd-d7a1ff2922fd/ss_14ad1a8d.png) | ![Table limits](https://app.devin.ai/attachments/9cd36722-c472-423d-9906-93eef5f53518/ss_zoom_fe05ab94.png) |
-
-### 4. Console
-After a fresh page reload and interacting with all UDL objects, the console contained no errors. Only pre-existing noise: a Vue `defineExpose()` compiler-hint warning from `AppLayout/StatusIndicators` (present on master, unrelated to plugin) and webpack-dev-server/HMR info logs.
-
-### 5. Regression — Sine Wave Generator
-Created via Create > Sine Wave Generator into My Items; plot renders live sine data in Real-Time mode.
-
-![Sine regression](https://app.devin.ai/attachments/d5d489cf-400b-4a26-a8e9-6a09b68535b9/ss_f6064aaa.png)
-
-## Notes
-- The limit thresholds observed in the table match `ConjunctionLimitProvider.js` (PC_CRITICAL=1e-4 red, PC_WARNING=1e-5 yellow).
-- No issues found.

From f4d22f7e188acfba22ce041c258b9ca9372245d0 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Wed, 29 Jul 2026 17:22:06 +0000
Subject: [PATCH 4/5] Handle latest strategy in request(); enforce hard datum
 cap

Co-Authored-By: Jake Cosme <jake@cognition.ai>
---
 example/udlFederation/UDLTelemetryProvider.js | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/example/udlFederation/UDLTelemetryProvider.js b/example/udlFederation/UDLTelemetryProvider.js
index ad6db11679..d10beaa58b 100644
--- a/example/udlFederation/UDLTelemetryProvider.js
+++ b/example/udlFederation/UDLTelemetryProvider.js
@@ -87,15 +87,22 @@ export default class UDLTelemetryProvider {
   request(domainObject, options) {
     const period =
       domainObject.type === 'udl.conjunctions' ? CONJUNCTION_PERIOD_MS : EPHEMERIS_PERIOD_MS;
-    const size = options.size ?? MAX_REQUEST_DATUMS;
+    const size = Math.min(options.size ?? MAX_REQUEST_DATUMS, MAX_REQUEST_DATUMS);
     const start = Math.floor(options.start / period) * period;
     const requestedCount = Math.floor((options.end - start) / period) + 1;
     const count = Math.min(requestedCount, size);
-    const step = count > 1 ? (options.end - start) / (count - 1) : period;
-
     const data = [];
-    for (let i = 0; i < count; i++) {
-      data.push(this.#datumFor(domainObject, start + Math.round(i * step)));
+
+    if (options.strategy === 'latest') {
+      const alignedEnd = Math.floor(options.end / period) * period;
+      for (let i = count - 1; i >= 0; i--) {
+        data.push(this.#datumFor(domainObject, alignedEnd - i * period));
+      }
+    } else {
+      const step = count > 1 ? (options.end - start) / (count - 1) : period;
+      for (let i = 0; i < count; i++) {
+        data.push(this.#datumFor(domainObject, start + Math.round(i * step)));
+      }
     }
 
     return Promise.resolve(data);

From a0e7ac1ee4d9151a3605a07a5a1d6dd6c62c5132 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Wed, 29 Jul 2026 17:31:26 +0000
Subject: [PATCH 5/5] Do not install UDL federation example by default in dev
 sandbox

Co-Authored-By: Jake Cosme <jake@cognition.ai>
---
 index.html | 1 -
 1 file changed, 1 deletion(-)

diff --git a/index.html b/index.html
index 001972ddc8..42417f0022 100644
--- a/index.html
+++ b/index.html
@@ -105,7 +105,6 @@
       openmct.install(openmct.plugins.example.EventGeneratorPlugin());
       openmct.install(openmct.plugins.example.ExampleImagery());
       openmct.install(openmct.plugins.example.ExampleTags());
-      openmct.install(openmct.plugins.example.UDLFederation());
 
       openmct.install(openmct.plugins.Espresso());
       openmct.install(openmct.plugins.MyItems());