Issue with DP Target Coordinate Retrieval

[ghawkins]

So I came across something I've never seen before.  I was doing an extended photometry run on 2/1/23. This involved a meridian flip about 90 mins into the run.  I processed the data through the DP in the usual way, either entering the target name or seeing that it was already in place.  When I examined the AIRMASS and ALT_OBJ in the measurement file and AIRMASS on the plot, the numbers were clearly wrong.

I started checking parameters; the image FITS headers showed the correct time and target Altitude.  I checked the DP Coodinate Convertor, and the target name was correct.  I went to the CCD Data Processor, and Target Coordinate Source showed Coordinate Convertor Manual enter.  I switched this to FITS header target name.  The run aborted as it could not find the appropriate information in the FITs header.  I changed the Target Coordinate Source back to Coordinate Convertor Manual, and reentered the DP Coordinate Convertor, typed in the target name, and I'm pretty sure the RA/Dec coordinates changed from what was there previously.  I checked these new coordinates - they were correct. After running the DP, AIRMASS now calculates correctly.

It seems at one point the target name was correct in the DP Coordinate Convertor but the RA/Dec was wrong.

Best regards,

Gary

[karenacollins]

I'm not sure how this would happen unless for some reason the target did not resolve when you pressed enter (SIMBAD down??), or maybe <enter> was inadvertently not pressed on the first run?? If you are able to duplicate the problem and a sequence of steps to cause it to happen, then we could dig deeper with an example dataset.

[ghawkins]

Hi Karen,

Yes, it's difficult to understand what happened.  I'll keep an eye out for any further occurrences.

Best regards,

Gary