1. Home
  2. Forums
  3. Variable Star Observing
  4. AAVSOnet

BSM Question

Announcement: New Forums

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.

Ed Wiley_WEY
Affiliation
American Association of Variable Star Observers (AAVSO)
Fri, 01/04/2019 - 03:05

Re the BSM scopes: I am wondering what the upper (bright) limits are for Ic imaging. For example, could I reasonably image a variable if its Ic magnitude at the time was Ic mag 3-4?

Thanks, Ed

HQA
Affiliation
American Association of Variable Star Observers (AAVSO)
Fri, 01/04/2019 - 11:26
BSM bright limit

Hi Ed,

The BSM systems are spec'd to be able to image 2nd magnitude objects.  That said, 2nd magnitude requires about 50-100 images per filter to reduce scintillation.  At mag 3-4, you need about 10 images per filter to reduce scintillation, and then stack and measure.  We did eps Aur in 2009-2020 without problem, so you should be safe at Ic=3-4.

Arne