Details
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Type:
Story
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Status: Done
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Resolution: Done
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Fix Version/s: None
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Component/s: obs_lsst
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Labels:None
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Story Points:1
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Team:Ops Middleware
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Urgent?:No
Description
The values in the SAL messages from the pointing component that are used for the RASTART and RAEND headers are incorrect.
Prior to about 2021-02-11T1845Z, they were in decimal hours and were offset by -37 seconds from the correct value (due to TAI/UTC).
After about 2021-02-11T1845Z, they are in decimal degrees but are still offset by -37 seconds (of time, not of arc).
It is expected that there will be a further change in the future to remove the offset.
Please adjust obs_lsst to produce the correct values for this metadata.
Tiago Ribeiro Please correct if I got anything wrong.
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Activity
| Field | Original Value | New Value |
|---|---|---|
| Description |
The values in the SAL messages from the pointing component that are used for the RASTART and RAEND headers are incorrect.
Prior to about 2021-02-11T1900Z, they were in decimal hours and were offset by -37 seconds from the correct value (due to TAI/UTC). After about 2021-02-11T1900Z, they are in decimal degrees but are still offset by -37 seconds of arc. It is expected that there will be a further change in the future to remove the offset. Please adjust obs_lsst to produce the correct values for this metadata. [~tribeiro] Please correct if I got anything wrong. |
The values in the SAL messages from the pointing component that are used for the RASTART and RAEND headers are incorrect.
Prior to about 2021-02-11T1845Z, they were in decimal hours and were offset by -37 seconds from the correct value (due to TAI/UTC). After about 2021-02-11T1845Z, they are in decimal degrees but are still offset by -37 seconds of arc. It is expected that there will be a further change in the future to remove the offset. Please adjust obs_lsst to produce the correct values for this metadata. [~tribeiro] Please correct if I got anything wrong. |
| Status | To Do [ 10001 ] | In Progress [ 3 ] |
I've had a quick look at a couple of files and after I correct for the hours->degrees problem and 37 seconds I have:
$ translate_header.py -p lsst.obs.lsst.translators -m fixed tests/headers/latiss-AT_O_20210212_000006.yaml | grep RA
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Analyzing tests/headers/latiss-AT_O_20210212_000006.yaml...
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RA: 260.181360944445
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RASTART: 260.1785517385836
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RAEND: 260.17851507256665
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(lsst-scipipe-0.3.1) milo:obs_lsst_test (tickets/DM-28783) $ translate_header.py -p lsst.obs.lsst.translators -m fixed tests/headers/latiss-AT_O_20210210_000011.yaml | grep RA
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Analyzing tests/headers/latiss-AT_O_20210210_000011.yaml...
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RA: 355.38776875
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RASTART: 355.41750341182313
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RAEND: 355.3854958801916
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It looks like there was poor tracking on the observation on the 10th but it ended up in the right place. I think the observation are showing a 8 to 10 arcsecond error now.
Tiago Ribeiro would you mind taking a quick look?
I wasn't sure about applying cos(dec) when correcting for the 37 seconds.
| Reviewers | Tiago Ribeiro [ tribeiro ] | |
| Status | In Progress [ 3 ] | In Review [ 10004 ] |
| Reviewers | Tiago Ribeiro [ tribeiro ] | Merlin Fisher-Levine [ mfisherlevine ] |
Merlin Fisher-Levine thank you for agreeing to review.
| Status | In Review [ 10004 ] | In Progress [ 3 ] |
| Status | In Progress [ 3 ] | In Review [ 10004 ] |
| Description |
The values in the SAL messages from the pointing component that are used for the RASTART and RAEND headers are incorrect.
Prior to about 2021-02-11T1845Z, they were in decimal hours and were offset by -37 seconds from the correct value (due to TAI/UTC). After about 2021-02-11T1845Z, they are in decimal degrees but are still offset by -37 seconds of arc. It is expected that there will be a further change in the future to remove the offset. Please adjust obs_lsst to produce the correct values for this metadata. [~tribeiro] Please correct if I got anything wrong. |
The values in the SAL messages from the pointing component that are used for the RASTART and RAEND headers are incorrect.
Prior to about 2021-02-11T1845Z, they were in decimal hours and were offset by -37 seconds from the correct value (due to TAI/UTC). After about 2021-02-11T1845Z, they are in decimal degrees but are still offset by -37 seconds (of time, not of arc). It is expected that there will be a further change in the future to remove the offset. Please adjust obs_lsst to produce the correct values for this metadata. [~tribeiro] Please correct if I got anything wrong. |
Looks fine. I didn't check that the dates were correct
| Status | In Review [ 10004 ] | Reviewed [ 10101 ] |
| Reviewers | Merlin Fisher-Levine [ mfisherlevine ] | Robert Lupton [ rhl ] |
| Resolution | Done [ 10000 ] | |
| Status | Reviewed [ 10101 ] | Done [ 10002 ] |
| Story Points | 1 |
The translator currently is set up to
Current data therefore needs the RASTART header corrected by the time offset. If the time is out by 37 seconds I think you are asking for a correction of 15*37*cos(dec) arcseconds to be made. We should be able to see that in the difference between the RASTART and RA headers. I take it that we have some data somewhere at NCSA that has this style of RASTART onsky header?