I was trying to use astroimagej to create an AAVSO report. The macro requests the “catalog magnitude error” for check and comp star. Where is this found? Sorry, if this is an obvious question but up till now, I’ve been using VPHOT to generate the file and haven’t had to look for this. I didn’t see anything labeled “catalog magnitude error” on the generated plot or photometric report from the plot. Any guidance would be appreciated.
Isn’t the catalog magnitude error the decimal number inside parentheses listed beneath the tabulated standard magnitude in the “Table of Field Photometry”? To make the table, use AAVSO’s Variable Star Plotter. Click the radio button labeled “Photometry.”
Best, Andy
That may be it, but here is a longer winded explanation. I’m actually taking measurements in TR, TG, TB so I don’t see that filter type in any selection as available in the VSP.
However, it looks like there is another err which does show up in the VPHOT processed image overlayed with the comps and targets. If I mouse over, say 121, it will show the magnitude and an error factor and this magnitude and error factor will change based on the filter type. That may be what I’m looking for but I haven’t found any reference specfically to it.
I think that what you are pointing out is indeed what I am looking for. The values that show up in the TR, TG, and TB images in Vphot do match the R, V, and B values.
Thanks very much.
Hi, John,
The catalog values are available only for standard photometric filters (Johnson-Cousins system). B and V are Johnson, Rc is Cousins.
You can approximate that B = TB, V = TG and Rc = TR.
Nikola
Yes, that’s what I have done.
I just started trying to use AIJ and am having issues of my own. But I may have something to offer here from my initial experience.
I was able to plate solve the images before doing the Multi-Aperture measurements and then checked the “prompt to enter ref star apparent magnitude…”. When I did the Multi-Aperture processing, and after clicking on the target star, AIJ went through a set of comp stars and, for each star, took me to SIMBAD which has magnitudes for various filters. I glanced at SIMBAD and entered the magnitude for the filter I was using in a new input box and hit OK. This makes things quite easy.
But, I have yet to figure out how to get the results into a file.
So, I did the analysis but cannot figure out how to get to the results. The documentation on line references a table that I cannot find.
I would be extremely grateful if someone would guide me through one session. I hope to see you in Portland this weekend.
Thanks,
Mark Spearman (SIQ)
Mark,
I use AIJ differently from the way you do, so be careful with the following, but hopefully it may help.
During a photometry run, my computer screen fills with windows, much like the first screenshot below. Note the minimized window at the top left, which I’ve highlighted with a red rectangle. It may not even be visible, so if not, tab through the open windows until you see it. When you do, click the maximize icon (the open square) in the middle. That should display a table of photometry results, part of which is shown in the second screenshot.
Roy,
Thank you so much for getting back to me. I did see that little icon but did not know what it did.
Clear skies,
Mark