Affiliation
American Association of Variable Star Observers (AAVSO)
Fri, 07/18/2014 - 07:45
Seeing that were getting more CVs from the ASASSN survey, I wonder if we will get more AASVO charts with photometry tables at the F or E scale (Dim as IVB magnitude 16). So far I see ASASSN-14cv and ASASSN-14cl with photometry comparison star data, but the one I've been recently observing, ASASSN-14du, while having a chart, does not have any nearby stars (i.e. <0.5 degrees) to compare to. Maybe I'll have to do some standards and get my feet wet into all-sky photometry? :)
James Foster, Los Angeles, CA
Hi James,
If you go to the AAVSO home page, click on the Observing pull-down menu, go to the submenu for Variable Star Charts, you will see a link to "Request Comparison Stars." Follow the instructions, and the sequence team will create a sequence for the target that you want.
With today's available resources, such as APASS, there is little need to do all-sky photometry. I think it will die a natural death, just as all-sky astrometry has done. :-)
Arne
To: Dr. Arne,
Thanks! I know a researcher or two who wont let all-sky photometry die, but they have special interest in small body photometry where the fields are always changing and they measure atmospheric excitation while redcuing their IRVB data at various Sec(z)=1, Sec(z)=1.5, and Sec(z)=2.2 altitudes; this is done with IRAF of course! I'd prefer to keep it simple and do differential and get more data to AASVO than messing with complicated software packages.
Btw, thanks for your presentation of Photometry transforms at the SAS. Have a bunch of M67 I'm dying to get transfomation coefficient from!
James