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IDProjectCategoryView StatusLast Update
0002062CCdciel[All Projects] Generalpublic19-01-24 16:14
ReporterhanAssigned ToPatrick Chevalley 
PrioritynormalSeverityfeatureReproducibilityhave not tried
Status resolvedResolutionfixed 
Product Version 
Target Version1.0Fixed in Version 
Summary0002062: Feature: FITS keyword for altitude
DescriptionFor image HFD analyses it could be useful to have the altitude. If already available, could it be added to the FITS header? For completeness the azimuth could be added. This azimuth could be used for sky background analyses in diffferent directions but use will be limited. Looking to the existing keywords, I would propose to use:

CENTALT – nominal Altitude of center of image in degrees.
CENTAZ – nominal Azimuth of center of image in degrees.

In use by other software programs:
MaximDL
OBJCTALT – nominal altitude of center of image
OBJCTAZ – nominal azimuth of center of image
CENTAZ – nominal Azimuth of center of image in degrees.
CENTALT – nominal Altitude of center of image in degress.

SBIG (2003)
CENTAZ String - Azimuth in degrees of the center of the image in degrees. Format is the same as the OBJCTDEC keyword.
CENTALT String - Altitude in degrees of the center of the image in degrees. Format is the same as the OBJCTDEC keyword.


SGP
OBJCTALT= 40.4226 / Altitude of the object
CENTALT = 40.4226 / Altitude of the object
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Activities

Patrick Chevalley

19-01-24 13:32

administrator   ~0005278

Yes this is a good point.

The best position to give here is probably at the time of middle exposure. I not see any information about that in the Sbig document.

han

19-01-24 13:37

reporter   ~0005279

I think there is no need to calculate the middle of the exposure. At the end or start of exposure is fine for me.

Patrick Chevalley

19-01-24 16:14

administrator   ~0005281

This is done :
https://github.com/pchev/ccdciel/commit/6bf32f3efa0ad730b8c857301f42cc01fd196a13

I add both CENTxx and OBJCTxx if this can help more software.
I also take the occasion to add the airmass that was not present on Ascom images.

This is for mid-exposure, not something difficult to do and this can help for photometry application that also need this value.

Issue History

Date Modified Username Field Change
19-01-24 13:08 han New Issue
19-01-24 13:32 Patrick Chevalley Assigned To => Patrick Chevalley
19-01-24 13:32 Patrick Chevalley Status new => assigned
19-01-24 13:32 Patrick Chevalley Note Added: 0005278
19-01-24 13:37 han Note Added: 0005279
19-01-24 16:14 Patrick Chevalley Status assigned => resolved
19-01-24 16:14 Patrick Chevalley Resolution open => fixed
19-01-24 16:14 Patrick Chevalley Target Version => 1.0
19-01-24 16:14 Patrick Chevalley Note Added: 0005281