ZYT

How to find ePSF for multiple dithered undersample images?

1

I want to use ePSF to refine star center positions, then feed to Scamp for better wcs to do SWarp. But im not clear how EPSFBuilder work on dither images,...

why find_optimal_celestial_wcs() always return PC coefficients with 1.0, 0.0, 1.0, 0.0

4

I tried several images but find_optimal_celestial_wcs() keeps returning PC1_1, PC2_2 = 1.0, PC1_2, PC2_1 = 0. I want to write it to the final coadd image. ``` files = glob.glob(path...

Version: 0.14.0 ``` 1 coaddfile = os.path.join(path, 'new_cube.fits') 2 header_out = hdus[0].header 3 array = reproject_and_coadd(hdus, 4 wcs_out, 5 #output_array=hdu_out[0].data.astype(np.float64), 6 shape_out=shape_out, 7 combine_function = 'mean', 8 reproject_function=reproject_interp, 9 match_background=True,...

版本2025.12.01.02

I tried to run `astcheck -c "2025-01-01T21:02:24" 67.954683175479 46.508558421918 O17 -r 18000 -m 21` with `MPCORB.DAT` downloaded in 2025-07-22. And I found the precision was quite bad (online astcheck result...