We are excited to announce the launch of our new forums! You can access it forums.aavso.org. For questions, please see our blog post. The forums at aavso.org/forum have become read-only.
Announcement: New Applications
We are excited to announce the launch of our new applications! We're opening up early access to our new applications for searching, downloading, and submitting photometric observations. You can now access these applications through these links:
We ask for your feedback in order to help us improve these applications. Please send feedback for the applications above to feedback@aavso.org. Note: please avoid duplicating submissions across the two submit applications.
Capital letters are used for Standard Values. I assume that this is what you are looking for. Go to the web page, select "Observing" Tab, then "Star Charts". Enter the object name or coordinates, etc,, and select "Photometry Table". A Table of U, B, V, B-V, R, Ic, and nir Standard values will be displayed. You can print both the finder chart and the Photometry Table for future use.
You can ascertain the B-V of variables in the VSD database using SeqPlot
http://www.aavso.org/seqplot
You can also get a rough idea of the color of your variables by noting the spectral type in VSX.
http://www.aavso.org/vsx/
Be aware that B-V can and does change during the cycle of many types of variables, so one of the things we strive to get AAVSO observers to do is provide transformed color and magnitude information when you submit data. It's essentially wide band spectroscopy, and can yield important science results.
I guess you need B-V in order to transform TG magnitudes to V using the Citizens Sky DSLR photometry tutorial. I wouldn't do this.
Instead just submit IMHO the TG magnitudes to AAVSO.
If you realy want to transform you TG magnitudes to V I'd recommend first to determine the transformation coefficients of your camera using the methode described here: http://reductionism.net.seanic.net/CCD_TE/cte.html
Hello
Capital letters are used for Standard Values. I assume that this is what you are looking for. Go to the web page, select "Observing" Tab, then "Star Charts". Enter the object name or coordinates, etc,, and select "Photometry Table". A Table of U, B, V, B-V, R, Ic, and nir Standard values will be displayed. You can print both the finder chart and the Photometry Table for future use.
Gary
You can ascertain the B-V of variables in the VSD database using SeqPlot
http://www.aavso.org/seqplot
You can also get a rough idea of the color of your variables by noting the spectral type in VSX.
http://www.aavso.org/vsx/
Be aware that B-V can and does change during the cycle of many types of variables, so one of the things we strive to get AAVSO observers to do is provide transformed color and magnitude information when you submit data. It's essentially wide band spectroscopy, and can yield important science results.
Mike Simonsen (SXN)
AAVSO
I guess you need B-V in order to transform TG magnitudes to V using the Citizens Sky DSLR photometry tutorial. I wouldn't do this.
Instead just submit IMHO the TG magnitudes to AAVSO.
If you realy want to transform you TG magnitudes to V I'd recommend first to determine the transformation coefficients of your camera using the methode described here: http://reductionism.net.seanic.net/CCD_TE/cte.html
Clear skies,