Skip to main content

Air Mass

The membership database is currently undergoing upgrading/testing. Web functions that involve an interface with the member database (webobs, etc.) may experience intermittent problems. We hope to have this issue resolved within 24 hours (by 5pm Eastern Time on October 1st or 12:00 UT). Thank you for your patience.
Ed Wiley_WEY's picture
Ed Wiley_WEY
Joined: 2010-08-30

Can anyone tell me what the minimum FITS keywords are needed to compute airmass? My earlier images have airmass but the last batch I uploaded lack airmass.

I also note that longitude in the FITS header is +95... not -95. Observatory information is correct and I think SkyX is correct, but I need to check the original images ans see where the problem lies. This does not seem to be the airmass problem since earlier images with +95 seem to have airmass values that make sense..

Ed Wiley (WEY)

Air Mass
roe's picture
Joined: 2010-07-25

All VPHOT needs is the altitude of the target (OBJCTALT).

AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484