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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0002019||CCdciel||[All Projects] General||public||18-11-13 20:34||18-11-17 21:09|
|Reporter||Cedric Raguenaud||Assigned To||Patrick Chevalley|
|Target Version||2.0||Fixed in Version|
|Summary||0002019: Suggestion: add option to cancel exposure when PhD deviates too much|
|Description||Add the option to cancel the current exposure when PhD guiding's total RMS goes over a certain value more than e.g. 2 cycles. That would avoid fat stars and trails.|
|Tags||No tags attached.|
This look possible, the PHD2 event monitor send this information, AvgDist, in the GuideStep event.
The value is in pixel but we can also ask for the pixel size in arcseconds.
The abort condition can be set as AvgDist>limit[arcsec] for more than X seconds.
If this condition is raised the program must:
- abort main camera exposure
- stop autoguiding
- start autoguiding
- restart exposure without increment of the counter
Restarting the autoguiding is necessary to reset the lock position, because if it was not successful to recenter the guide star in the previous 15 seconds it will probably not in the next. Also the settling wait after the restart must ensure the guiding is now good.
||I was thinking simpler : if AvgDist>limit[arcsec] for more than X seconds, cancel the current exposure and wait until PhD does its job and recenters (I. E. AvgDist<limit[arcsec] again).|
||Yes this is better this way.|
||I guess in the case the coordinates of the target are known, if after Y seconds PhD isn't reporting that it's guiding again <limit[arcsec], ccdciel could stop guiding, recenter (with plate solving if the option is activated), then start guiding again.|
As for 0002025 the problem is to cleanly stop the current exposure without the risk to break the sequence depending on the current operation.
It is safer to report to V2.0
|18-11-13 20:34||Cedric Raguenaud||New Issue|
|18-11-13 22:41||Patrick Chevalley||Assigned To||=> Patrick Chevalley|
|18-11-13 22:41||Patrick Chevalley||Status||new => assigned|
|18-11-13 22:41||Patrick Chevalley||Target Version||=> 1.0|
|18-11-13 22:41||Patrick Chevalley||Note Added: 0005070|
|18-11-13 22:51||Cedric Raguenaud||Note Added: 0005072|
|18-11-14 09:47||Patrick Chevalley||Note Added: 0005073|
|18-11-14 15:01||Cedric Raguenaud||Note Added: 0005080|
|18-11-16 22:01||Patrick Chevalley||Relationship added||related to 0002025|
|18-11-17 21:09||Patrick Chevalley||Target Version||1.0 => 2.0|
|18-11-17 21:09||Patrick Chevalley||Note Added: 0005106|