I downloaded 1.7, found the Bug, is the star browser Bug.
Posted: 03.10.2017, 07:11
Look! Sol!
Yes, there is a bug in the Star browser in Celestia 1.7 64 bit.
http://celestia.space/forum/viewtopic.php?f=4&t=17731&start=20
Added after 1 minute 38 seconds:
Celestia 1.7 doesn't "see" add-on stars it seems.