Star annotation in photometry not available ?
Stacking program, astrometric (plate) solver, fits file viewer
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Hello,
I watched the Youtube video for ASTAP photometry from hank. In photometry tab, there is a checkbox 'Annotate Variables' , and a button 'Refresh Astrometric Solution'. Both are not visible in my recent version 2023.11.10.
Ok annotation of variables is done automatically and workes fine, BUT , in Youtube video, after 'Annotate Variables' was executed, pictures also show annotations of all known stars, including spectral info and B-V value. Those annotations I never see in my pictures. How can I achieve this ?
Thanks and regards from Dresden/Germany
Thomas
Hi Thomas,
The star database annotation is available from the viewer menu "Tools", "Star database Annotation". Only when you have selected the V50 or V17 database in the stack menu, tab alignment you will see both the V magnitude and the difference between Gaia Bp and Rp. Theoretical I could also calculate B_V but that is a little more unreliable and that was not done.
With the same Tools menu and If you select in the tab photometry one of the online annotation options you can annotate the stars with the calculated Johnson B, V R magnitude.
While writing this, it is easy to add B-V from the online annotation since it calculated from the Gaia mangitudes. But this has not been implemented.
There are also some online options under the Viewer popup menu, "Online Query". Select a section with the mouse while holding the right mouse button down and after releasing it select "Online Query".
Han
Hi Han,
thank you very much for fast answer. Sorry, I am not able to see Bp-Rp, what I did
- open one Image
- go to alignment tab and choose star database V50 (was auto before)
- check 'Star alignment' , click Solve current image , also choose Star database Annotation from tools menu -> I only see yellow ring and a magnitude vale
- I did a cleanup and the same with 'Astrometric alignment' , same result
Please ... help :-)
Thomas
What I mean, in Youtube video
https://www.youtube.com/watch?v=99XxzmJPPPQ
at minute 6:56 there are green annotations of many stars, showing B-V values.
If this is now Bp-Rp it is also fine, but I am not able to produce those green annotations at all.
Activate that using the red marked menu as shown in the attachment. The online option goes much deeper. The local database maybe till magn 12.
Many thanks, I think I think I've got it right now :-)
Hello Han, I just saw the changes with "measure the magnitudes of all visible AAVSO VSX and VSP stars". In an image of M101, there are 4 variable stars - all are shown. But there are 14 AAVSO stars - only 4 are shown. If not all could be listed, then use those which mostly (!) fit the AAVSO value. That is what I always do.
Regards Achim
same with an image oF NGC3310:
2 variable stars - 2 are shown
10 AAVSO stars - 2 only are shown
Hi Achim,
Did you select the online database up to magnitude 99. To "measure all" you have to select "Annotation online database magn 99 & measure all". See attached.
I will update the documentation. It is experimental.
Cheers, Han
I looked again using other images and I think your correct. Some AAVSO stars are missing. I will fix it.
Han
I fixed some things. Try this development version 2023.12.05:
http://www.hnsky.org/astap#beta_version
Updated documentation:
http://www.hnsky.org/astap#measure_all
looks good, all variables and AAVSO-stars are now in. Just the count is double, shows 8 than 4, see attachment.
And it would be helpful, if the 'best fit' stars would be listed first.
Regards Achim
I will half the values.
I'm searching for the best interface /usability. That is not fully clear yet. It is important to match the check stars with the variables. Ideally the check star should be of similar magnitude and close to the variable position. This could be done in the AAVSO report menu or in the listview table.
I also like to use the local database since it can cover wide FOV then the online version.
Thomas is till copied in this discussion. I would suggest to move to this discussion:
https://sourceforge.net/p/astap-program/discussion/suggestions/thread/11ff524eed/
Han
Hello Han,
you are right, selecting check stars with similar magnitude is better, than 'best fit'-stars.
It's funny, I used 'best fit' (0.02..0.03m diff) as check and '3' stars and compared the result with 'worst fit'-stars (0.1...0.2m diff.), the measured magn. of the variable is fully identical.
Regards Achim
Hi.
I tried the new version 2023.12.06 64bit and now I can see four-point pointers and vertical lines on stars as it was before, only from the Tool - Variable star annotation menu. But from the Photometry tab there are no such pointers and it is hard to understand which stars the inscriptions refer to.
Hi Aleh,
I agree when the stars are bright the frour dots are not visible. In next version I will set for all cases the "pen" to Xor. This will result for a white background the 4 yellow dots will be blue. For the moment, reducing the brightness also helps.
This will be introduced in the next development version. It will be released in one or two days.
Cheers, Han
I apologize, perhaps I didn't express the point very well. I'm not saying that the dots are bad, they are NOT on the left image. I.e. if we open the Photometry tab, open a file or set of files, do the analysis, astrometry and whatever else is necessary, then we double-click on the file to label it Var, Check and 3. Now, this open image only has labels on it, no dots or vertical lines. So you can't tell which stars in the image the labels refer to.
It is just fixed in ASTAP version 2023-12-08. Try this version. If it is not working tell me.
Han