Inconsistent field-to-coordinates assignment

[RuslanKonno]

Disagreement in RA/Dec between images with the same Field ID.

e.g.: the reference image /marvin/references/1740/LAST.01.01.01_20240309.002455.399_clear_1740_000_001_020_sci_coadd_Image_1.fits has RA/Dec coordinates (162, 27) while the image /marvin/LAST.01.01.01/2024/03/03/proc/213523v0/LAST.01.01.01_20240303.213513.511_clear_1740_000_001_020_sci_coadd_Image_1.fits has RA/Dec coordinates (167, 75)

The coordinates are very off, so something clearly went wrong - not sure yet what the cause is or how many other images might have a similar issue.

[agioffe]

Did you check positions of some well-known objects in each of the fields? Do they appear where they should?

[RuslanKonno]

For one, just to show, the images do look like completely different fields.

Looking for some prominent objects, I do find them all on Simbad so it looks like the coordinates are correct wrt. to the image. So it seems like either of the images received the wrong target field or was pointed in the wrong direction.

[agioffe]

OK, so it looks like an issue of the pointing model as it was on that days. Let's just keep a list of such cases, probably, we'll see more of them, once we run the difference image pipeline further.

[EranOfek]

I suspect this is due to a problem with the goTo function. One possibility is that it failed due to a timeout. It will be good to consult with Enrico.

On Wed, Apr 17, 2024 at 11:17 AM Alexander Krassilchtchikov < @.***> wrote:

OK, so it looks like an issue of the pointing model as it was on that days. Let's just keep a list of such cases, probably, we'll see more of them, once we run the difference image pipeline further.

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[EastEriq]

I can only deal with this if it is reproducible. Find me a repeatable case where .goTo is commanded one position, and the mount goes somewhere else, then we talk.

[EranOfek]

is there a log file in which the mount reports on timeouts?

On Wed, Apr 17, 2024 at 11:39 AM EastEriq @.***> wrote:

I can only deal with this if it is reproducible. Find me a repeatable case where .goTo is commanded one position, and the mount goes somewhere else, then we talk.

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[EastEriq]

Only if specially activated beforehand on the whole MATLAB session. For past takes, not.

[EranOfek]

Closing due to ack oinformation.