GalSim-developers/GalSim

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The modular galaxy image simulation toolkit. Documentation:

Stars: 272
Forks: 121
Open beginner issues: 0
Indexed issues: 22

Dominant language: Python
License: No license data
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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22 open issues indexed

FFT segfault Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

GalSim-developers/GalSim#1362 · 1 comment · Opened Jun 9, 2026
Check that the user has write permissions for the output directory in the config file Open

config feature request

Difficulty 3/5 1-2 days Newbie friendliness 45/100

GalSim-developers/GalSim#1353 · Opened Mar 13, 2026
Error in the flux when summing achromatic opticalPSF using photon shooting Open

numerics optics/atm

Difficulty 3/5 1-2 days Newbie friendliness 45/100

GalSim-developers/GalSim#1352 · Opened Mar 10, 2026
random number generators perform unnecessary copy Open

optimization/performance

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

GalSim-developers/GalSim#1351 · 1 comment · Opened Mar 4, 2026
Photon shooting with OpticalPSF/InterpolatedImage gives different results on Mac ARM and Linux Open

numerics optics/atm

Difficulty 4/5 3-5 days Newbie friendliness 35/100

GalSim-developers/GalSim#1350 · 5 comments · Opened Mar 4, 2026
numerical issue for some realizations of atmosphere Open

optics/atm

Difficulty 5/5 Over a week Newbie friendliness 25/100

GalSim-developers/GalSim#1280 · 29 comments · Opened Mar 23, 2024
Sum over ghosts or use a diffrent formula for periodic cardinal sinus. Open

numerics optimization/performance

Difficulty 5/5 Over a week Newbie friendliness 25/100

GalSim-developers/GalSim#1267 · Opened Dec 21, 2023
define `origin` and `world_origin` for CelestialWCS classes? Open

feature request wcs

Difficulty 5/5 Over a week Newbie friendliness 35/100

GalSim-developers/GalSim#1260 · 8 comments · Opened Nov 7, 2023
Have GalSim support Windows installations. Open

build

Difficulty 4/5 3-5 days Newbie friendliness 30/100

GalSim-developers/GalSim#1168 · 3 comments · Opened Jul 14, 2022
King density profile implementation Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 20/100

GalSim-developers/GalSim#1134 · 1 comment · Opened Sep 9, 2021
Make most keyword parameters invalid as positional arguments Open

cleanup

Difficulty 5/5 Over a week Newbie friendliness 35/100

GalSim-developers/GalSim#1130 · Opened Jul 13, 2021
Investigate functools.lru_cache Open

cleanup

Difficulty 5/5 Over a week Newbie friendliness 35/100

GalSim-developers/GalSim#1125 · 1 comment · Opened Jun 19, 2021
`whitenNoise` not working properly with COSMOSCatalog real galaxies Open

bug report correlated noise

Difficulty 4/5 3-5 days Newbie friendliness 35/100

GalSim-developers/GalSim#1071 · 6 comments · Opened Dec 13, 2019
extrapolated galaxy models Open

desc feature request inputs

Difficulty 5/5 Over a week Newbie friendliness 25/100

GalSim-developers/GalSim#808 · 8 comments · Opened Sep 29, 2016
chromatic "RealGalaxy" objects from hydro simulations Open

chromatic desc feature request inputs

Difficulty 5/5 Over a week Newbie friendliness 20/100

GalSim-developers/GalSim#669 · 12 comments · Opened Jun 4, 2015
Update Gaussian random shear field generation Open

cleanup desc feature request lensing starter projects

Difficulty 5/5 Over a week Newbie friendliness 25/100

GalSim-developers/GalSim#641 · Opened Feb 9, 2015
streamlined, simplified validation scripts Open

cleanup tests

Difficulty 5/5 Over a week Newbie friendliness 30/100

GalSim-developers/GalSim#574 · 3 comments · Opened Jul 1, 2014
tabulated sersics Open

base classes feature request numerics starter projects

Difficulty 5/5 Over a week Newbie friendliness 25/100

GalSim-developers/GalSim#566 · 6 comments · Opened Jun 18, 2014
Centroid shifts from lensing Open

desc feature request lensing starter projects

Difficulty 5/5 Over a week Newbie friendliness 25/100

GalSim-developers/GalSim#557 · 6 comments · Opened May 29, 2014
Opacity of foreground objects Open

desc feature request starter projects

Difficulty 5/5 Over a week Newbie friendliness 20/100

GalSim-developers/GalSim#550 · Opened May 28, 2014
Updates to Shapelet.fitImage functionality Open

feature request

Difficulty 4/5 3-5 days Newbie friendliness 35/100

GalSim-developers/GalSim#502 · 1 comment · Opened Jan 20, 2014
time DFT vs. photon-shooting branch Open

desc numerics starter projects tests

Difficulty 4/5 3-5 days Newbie friendliness 25/100

GalSim-developers/GalSim#205 · 10 comments · Opened Jun 27, 2012

GalSim-developers/GalSim

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