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Re: DPCC Time stamp from FITS header

Posted by karenacollins on Aug 05, 2018; 6:30am
URL: http://astroimagej.170.s1.nabble.com/DPCC-Time-stamp-from-FITS-header-tp1031p1032.html

Hi Mark,


It is not currently possible to select the timing information keyword. Doing so would be somewhat complicated because the various keywords and keyword combinations tend to have different value formats. 


AIJ currently searches through a list of well known keywords (or combinations of keywords) to find what it thinks is the best timing information available in the header. 


Is the format of the  "GPSSTART" keyword the same as the standard "DATE-OBS" keyword? If so, I should be able to add this keyword to the sequence that is checked when I return to the office where my development computer is later in the coming week. 


Also, do you know what AIJ is currently selecting as a timing source keyword? The GPSSTART keyword would need to have higher priority in the search list.


Karen



From: Mark Salisbury [via AstroImageJ] <ml+[hidden email]>
Sent: Sunday, August 5, 2018 1:52 AM
To: karenacollins
Subject: DPCC Time stamp from FITS header
 
Hello

I am trying to find out if it is possible to change the FITS header field used to determine the UTC-based start of exposure time in DPCC?  One of the telescopes I am using has recently been upgraded with a GPS time unit and shutter trigger to provide very accurate timing but the new GPS determined start time is being added to the FITS header with a different FITS keyword - "GPSSTART".  I would like to use this time stamp to determine BJD_TDB rather than the usual "DATE-OBS" keyword.

Many thanks
Mark Salisbury

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