Airmass calculation
Posted: 15 Jul 2020, 20:01
Is there an Airmass calculation in AA7 or AA6 that can be taken from the ASCOM mounts altitude/azimuth info and be placed in the FITS header?
Thanks
Erik
Thanks
Erik
Code: Select all
lon = Observatory.Longitude
lat = Observatory.Latitude
ra,de = Image.EstimateRADec
azi,alt = EquatToAltaz(ra,de,lon,lat,Image.JD)
print "Azi,Alt =" ; azi ; alt
print "Airmass" ; Airmass(alt)
Image.SetKey("AIRMASS", Airmass(alt))
function Airmass(objalt)
if objalt < 0 then objalt = 0
thDeg = objalt + 244 / (165 + 47 * objalt^1.1)
return 1 / Sin(thDeg / 180 * PI)
end function
https://en.wikipedia.org/wiki/Air_mass_ ... e_formulas
Actually you don't need to read altitude/azimuth from the telescope, given the ra/dec and the coordinates of the observatory, they can be calculated. An option to add the AIRMASS keyword for every new image will be added in Service Pack 5 this september. If you need the prerelease just let me know.
Greetings, Fabio.
