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
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
Many thanks, Arne, just the information I needed.
Happy New Year, Ed