FITS Header fields data origins

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Patrick
Posts: 2
Joined: 01 Oct 2019, 01:10

FITS Header fields data origins

Post by Patrick » 01 Oct 2019, 01:29

Hello,
Can someone please explain where the data for following FITS header fields originates?:

RA
DEC
OBJECTRA
OBJECTDEC

I have images where the two RA values are the same (as are the two DEC values).

Regards,
Patrick

fabdev
Posts: 198
Joined: 03 Dec 2018, 21:43

Re: FITS Header fields data origins

Post by fabdev » 01 Oct 2019, 10:44

Hello, they are both the approximate center of the image. They are not standard, but widely used.
Astroart writes both to help other programs which may support only one. They are read from the telescope.
Reference:
https://heasarc.gsfc.nasa.gov/docs/fcg/common_dict.html
https://heasarc.gsfc.nasa.gov/docs/heas ... tsExt.html

Patrick
Posts: 2
Joined: 01 Oct 2019, 01:10

Re: FITS Header fields data origins

Post by Patrick » 05 Oct 2019, 06:48

Thank you - very helpful.
RA and DEC used by IRAF
Regards,
Patrick

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