INDI Library v1.8.5 Released (19 Apr 2020)

April 2020 release of INDI Library v1.8.5 introduces new drivers while providing fixes and improvements to existing devices and core framework.

Mosaic subfield center coordinates are wrong

9 months 3 weeks ago
Platinum Boarder
Platinum Boarder
Posts: 432
Karma: 1
Topic Author
Mosaic subfield center coordinates are wrong #43599
Shortly mentioned here , but maybe I rather put it in its own thread.
The center coordinates that the Mosaic tool of the scheduler creates are wrong (unless the mosaic is at the equator): The RA computation just assumes one RA second is 15 sky arc sec, but that is missing the factor 1/cos(DEC) and the overlap ends up being much to high.
E.g., for a 128x97 arcmin field with 5% overlap I get center coordinates in DEC 60⁰52'10" and 60⁰20'24", this is a difference of 92', which is 95% of 97' -> correct.
But for RA I get coordinates 2h58'36" and 2h50'31", ~8' in RA. At the equator this would indeed be 120', 95% of the width, but at DEC 60⁰ this is only 60' :ohmy:

openSUSE Tumbleweed KStars git INDI git

Please Log in or Create an account to join the conversation.

Time to create page: 0.306 seconds