ixpeobssim uses 'angle_utilities' which has been deprecated in astropy 6.0

[albertomanfreda]

Apparently in Astropy6.0 'angle_utilities', which is used in ixpeobssim.utils.astro to import 'angular_separation' is gone, and you should now import 'angular_separation' directly from 'astropy.coordinates'

https://docs.astropy.org/en/stable/changelog.html
cta-observatory/pyirf#270

Thus ixpeobssim is currently not compatible with Astropy 6:

from ixpeobssim.utils import astro
Traceback (most recent call last):
File "", line 1, in
File "/home/alberto/xpe/ixpeobssim/ixpeobssim/utils/astro.py", line 28, in
from astropy.coordinates import angle_utilities, SkyCoord
ImportError: cannot import name 'angle_utilities' from 'astropy.coordinates' (/home/alberto/heasoft/.heasoft-env/lib/python3.10/site-packages/astropy/coordinates/init.py)

[lucabaldini]

Looking into this...

[lucabaldini]

Shipped in 30.6.4