Hello Han, I'm having an issue getting ASTAP to platesolve using NINA.
I also tried platesolving using astrometry.net to make sure that there is nothing inherently wrong with my image, but it works. Following this I tried platesolving using ASTAP directly, yet I also cannot get it to work.
As far as I'm aware, I have entered all information correctly in NINA and ASTAP. I've also tried various downsampling factors. I will attach the file; the image is a 0.33° x 0.22° FOV.
Do you see anything wrong with the image which prevents platesolving? The stars look pretty round to me.
and the size in arcmin/degrees is about what you specified. The problem is that there are for the software only 14 stars recognisable. The average HFD halfflux diameter of stars is about 13 equals 4.5 arc seconds. so the image is focused.
Still it is strange that the number of stars is so low. It would require about 50 stars for reliable solving. So the camera sensitivity seems low. If you can' t record more stars, I'm afraid plate solving will be no success. Worst case keep this 100 seconds exposure and use Astrometry.net for solving.
Han
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The histogram is a little strange in ASTAP. The background value is very high. The gain in the header is reported as 50. However for unity gain it should be set at 0. See:
I think you should set the gain at unity gain=0 first. I would not deviate from unity gain. If you stack, make darks and flatd also again at unity gain=0.
Since you have a small field, probably it is also better to install the G18 star database and remove the G17, but first get an image with at least 50 stars. Normally an exposure of 10 seconds should be sufficient.
Setting the gain at zero should help. If not send me a link a of a new image at unity gain.
Hello Han, I'm having an issue getting ASTAP to platesolve using NINA.
I also tried platesolving using astrometry.net to make sure that there is nothing inherently wrong with my image, but it works. Following this I tried platesolving using ASTAP directly, yet I also cannot get it to work.
As far as I'm aware, I have entered all information correctly in NINA and ASTAP. I've also tried various downsampling factors. I will attach the file; the image is a 0.33° x 0.22° FOV.
Do you see anything wrong with the image which prevents platesolving? The stars look pretty round to me.
Image (.tif) : https://ufile.io/4rojxy1x
Image (.fits) : https://ufile.io/wpvjwqge
Camera is a QHY178-5 colour, 2.4um pixel size with a GBRG Pattern in Pixinsight
Thanks!
I check the dimension at:
http://nova.astrometry.net/user_images/3667993#annotated
and the size in arcmin/degrees is about what you specified. The problem is that there are for the software only 14 stars recognisable. The average HFD halfflux diameter of stars is about 13 equals 4.5 arc seconds. so the image is focused.
Still it is strange that the number of stars is so low. It would require about 50 stars for reliable solving. So the camera sensitivity seems low. If you can' t record more stars, I'm afraid plate solving will be no success. Worst case keep this 100 seconds exposure and use Astrometry.net for solving.
Han
The histogram is a little strange in ASTAP. The background value is very high. The gain in the header is reported as 50. However for unity gain it should be set at 0. See:
https://www.qhyccd.com/index.php?m=content&c=index&a=show&catid=94&id=42&cut=1
I think you should set the gain at unity gain=0 first. I would not deviate from unity gain. If you stack, make darks and flatd also again at unity gain=0.
Since you have a small field, probably it is also better to install the G18 star database and remove the G17, but first get an image with at least 50 stars. Normally an exposure of 10 seconds should be sufficient.
Setting the gain at zero should help. If not send me a link a of a new image at unity gain.
Clear skies, Han
Have a look at this graph:
https://www.qhyccd.com/uploadfile/2018/0811/20180811062535297.png
Last edit: han.k 2020-05-18