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OpenMay 29, 2026
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•Last updated This "milestone" is really just a tag for all issues that either turn out not to be a bug in GalSim or maybe involved just a question about how GalSim works or similar discussions that don't end up leading to new committed code.
It's mostly just a classification of issues that shouldn't be in one of the regular milestones, so giving them this milestone helps filter them out of issue lists to be classified.
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Minimize bouncing on extended diffraction spikes
numericsInvolving details of the numerical algorithms for performing some calculation(s)Involving details of the numerical algorithms for performing some calculation(s)optics/atmRelated to realistic PSFs from optics, atmosphere, etc.Related to realistic PSFs from optics, atmosphere, etc.romanRelevant to Roman Space Telescope specifically, especially including the galsim.roman module.Relevant to Roman Space Telescope specifically, especially including the galsim.roman module.Status: Closed (completed).#1342 In GalSim-developers/GalSim;Extinction for chromatic objects
chromaticRelated to the Chromatic classes, SEDs, bandpasses, etc.Related to the Chromatic classes, SEDs, bandpasses, etc.descOf possible interest to LSST DESC members looking for a projectOf possible interest to LSST DESC members looking for a projectfeature requestRequest for a new feature in GalSimRequest for a new feature in GalSimstarter projectsPossibly a good choice for someone looking to get started on GalSim developmentPossibly a good choice for someone looking to get started on GalSim developmentStatus: Closed (completed).#541 In GalSim-developers/GalSim;Thread safe C++ library
feature requestRequest for a new feature in GalSimRequest for a new feature in GalSimnumericsInvolving details of the numerical algorithms for performing some calculation(s)Involving details of the numerical algorithms for performing some calculation(s)optimization/performanceRelated to the speed and/or memory consumption of some aspect of the codeRelated to the speed and/or memory consumption of some aspect of the codeStatus: Closed (completed).#545 In GalSim-developers/GalSim;Improved RealGalaxy catalog
descOf possible interest to LSST DESC members looking for a projectOf possible interest to LSST DESC members looking for a projectfeature requestRequest for a new feature in GalSimRequest for a new feature in GalSiminputsRelated to input files used by GalSim, such as the cosmos data, SEDs, bandpasses, etc.Related to input files used by GalSim, such as the cosmos data, SEDs, bandpasses, etc.Status: Closed (completed).#551 In GalSim-developers/GalSim;Simulate prism observations
feature requestRequest for a new feature in GalSimRequest for a new feature in GalSimromanRelevant to Roman Space Telescope specifically, especially including the galsim.roman module.Relevant to Roman Space Telescope specifically, especially including the galsim.roman module.Status: Closed (completed).#1018 In GalSim-developers/GalSim;Intracluster light
descOf possible interest to LSST DESC members looking for a projectOf possible interest to LSST DESC members looking for a projectfeature requestRequest for a new feature in GalSimRequest for a new feature in GalSimlsstRelevant to LSST specificallyRelevant to LSST specificallystarter projectsPossibly a good choice for someone looking to get started on GalSim developmentPossibly a good choice for someone looking to get started on GalSim developmentStatus: Closed (completed).#893 In GalSim-developers/GalSim;Add Roman's brighter-fatter effect to galsim.roman module
feature requestRequest for a new feature in GalSimRequest for a new feature in GalSimromanRelevant to Roman Space Telescope specifically, especially including the galsim.roman module.Relevant to Roman Space Telescope specifically, especially including the galsim.roman module.Status: Closed (completed).#1015 In GalSim-developers/GalSim;Roman detector functionality updates from hackathon: a taxonomy of bad pixels
feature requestRequest for a new feature in GalSimRequest for a new feature in GalSimromanRelevant to Roman Space Telescope specifically, especially including the galsim.roman module.Relevant to Roman Space Telescope specifically, especially including the galsim.roman module.Status: Closed (completed).#1013 In GalSim-developers/GalSim;Inventory of publicly available GalSim datasets
adminAdministrative stuff, rather than codeAdministrative stuff, rather than codeinputsRelated to input files used by GalSim, such as the cosmos data, SEDs, bandpasses, etc.Related to input files used by GalSim, such as the cosmos data, SEDs, bandpasses, etc.Status: Closed (completed).#1044 In GalSim-developers/GalSim;inner scale
feature requestRequest for a new feature in GalSimRequest for a new feature in GalSimoptics/atmRelated to realistic PSFs from optics, atmosphere, etc.Related to realistic PSFs from optics, atmosphere, etc.Status: Closed (completed).#1133 In GalSim-developers/GalSim;New quintic kernel for interpolation in Fourier Space
feature requestRequest for a new feature in GalSimRequest for a new feature in GalSimnumericsInvolving details of the numerical algorithms for performing some calculation(s)Involving details of the numerical algorithms for performing some calculation(s)Status: Closed (completed).#1265 In GalSim-developers/GalSim;Add 2nd central moments to base+compound GSObjects
descOf possible interest to LSST DESC members looking for a projectOf possible interest to LSST DESC members looking for a projectfeature requestRequest for a new feature in GalSimRequest for a new feature in GalSimstarter projectsPossibly a good choice for someone looking to get started on GalSim developmentPossibly a good choice for someone looking to get started on GalSim developmentStatus: Closed (completed).#815 In GalSim-developers/GalSim;Spergelets
feature requestRequest for a new feature in GalSimRequest for a new feature in GalSimStatus: Closed (completed).#628 In GalSim-developers/GalSim;implement fourier space moments from BFD
feature requestRequest for a new feature in GalSimRequest for a new feature in GalSimStatus: Closed (completed).#1119 In GalSim-developers/GalSim;Multiply SED in ChromaticTransformation by absolute value of determinant.
chromaticRelated to the Chromatic classes, SEDs, bandpasses, etc.Related to the Chromatic classes, SEDs, bandpasses, etc.numericsInvolving details of the numerical algorithms for performing some calculation(s)Involving details of the numerical algorithms for performing some calculation(s)Status: Closed (abandoned).GalSim-developers/GalSimnumber 1348#1348 In GalSim-developers/GalSim;Update all logging to use native Python loggers
input/outputRelated to reading or writing files in GalSimRelated to reading or writing files in GalSimStatus: Closed (abandoned).GalSim-developers/GalSimnumber 1345#1345 In GalSim-developers/GalSim;Want the ability to read in "LONPOLE" and potentially other arguments (e.g. SIP coefficients) from FITS headers.
feature requestRequest for a new feature in GalSimRequest for a new feature in GalSimwcsRelated to WCS coordinate transformationsRelated to WCS coordinate transformationsStatus: Closed (completed).#1361 In GalSim-developers/GalSim;Update jax_galsim test expected values for JAX 0.8.x
testsRelated to the test suiteRelated to the test suiteStatus: Merged (completed).GalSim-developers/GalSimnumber 1344#1344 In GalSim-developers/GalSim;fix: ensure we use .at syntax in tests
testsRelated to the test suiteRelated to the test suiteStatus: Closed (abandoned).GalSim-developers/GalSimnumber 1354#1354 In GalSim-developers/GalSim;bandpass definitions, demonstrations, etc.
chromaticRelated to the Chromatic classes, SEDs, bandpasses, etc.Related to the Chromatic classes, SEDs, bandpasses, etc.demosRelated to demos, tutorials, other example codeRelated to demos, tutorials, other example codedescOf possible interest to LSST DESC members looking for a projectOf possible interest to LSST DESC members looking for a projectdocsRelated to documentationRelated to documentationnotation/conventionsRelated to choices of units, names of things, other semi-arbitrary conventionsRelated to choices of units, names of things, other semi-arbitrary conventionsstarter projectsPossibly a good choice for someone looking to get started on GalSim developmentPossibly a good choice for someone looking to get started on GalSim developmentStatus: Closed (completed).#929 In GalSim-developers/GalSim;- Status: Closed (abandoned).GalSim-developers/GalSimnumber 1096#1096 In GalSim-developers/GalSim;
- Status: Closed (abandoned).GalSim-developers/GalSimnumber 1000#1000 In GalSim-developers/GalSim;
- Status: Closed (abandoned).GalSim-developers/GalSimnumber 1027#1027 In GalSim-developers/GalSim;
Chromatic seeing when photon shooting
chromaticRelated to the Chromatic classes, SEDs, bandpasses, etc.Related to the Chromatic classes, SEDs, bandpasses, etc.optics/atmRelated to realistic PSFs from optics, atmosphere, etc.Related to realistic PSFs from optics, atmosphere, etc.Status: Closed (abandoned).GalSim-developers/GalSimnumber 1225#1225 In GalSim-developers/GalSim;Define setter for Image.array to allow inplace operations
base classesRelated to GSObject, Image, or other base GalSim classesRelated to GSObject, Image, or other base GalSim classesfeature requestRequest for a new feature in GalSimRequest for a new feature in GalSimStatus: Closed (abandoned).GalSim-developers/GalSimnumber 1276#1276 In GalSim-developers/GalSim;