AAVSO: American Association of Variable Star Observers

Proposal #211

Proposer (43151) Stewart Bean (sjbeanmail@aol.com) obscode: BENS
Assigned To(3663) Dirk Terrell
Date SubmittedMay 10, 2021

The BAA VSS has started a campaign to observe CG Dra see https://britastro.org/node/25925. CG Dra is a rapidly outbursting ( ~11 days) DN but is rather faint and of modest range.

The present campaign follows a similar exercise in 2008 and aims to clarify the behaviour of this eclipsing DN. The proposed observations would be unfiltered photometry on a nightly basis. The programme will run until the end of December 2021 and the data published by J Shears et al probably in the BAA journal.


Stewart Bean

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
CG Dra 19.125731 52.97447 17.4–14.1 SRO 1 Nov. 26, 2021 No


(4726) Kenneth Menzies — May 30, 2021, 5:50 p.m.

Committed to SRO

(43151) Stewart Bean — June 3, 2021, 7:53 a.m.

How do I obtain a magnitude value in VPHOT for images taken with no filter?

If the C filter and magnitude values are mutually exclusive, can I change to the V filter.



(4726) Kenneth Menzies — June 3, 2021, 8:24 p.m.


Notice that the proposal states "unfiltered photometry", that means a clear filter. This is probably noted because the target is faint? Ask Jeremy what he meant?

You should use the comp V reference magnitudes for your analysis in VPhot. IF you cannot figure this out in vphot, send me an email to kenmenstar@gmail.com or we can skype..


(43151) Stewart Bean — June 6, 2021, 6:39 p.m.

I have asked Jeremy.
I have also signed up for the Vphot course coming soon.

(43151) Stewart Bean — Oct. 21, 2023, 1:40 p.m.

Ken, As SRO ran into difficulties and did not produce many results , could this be rescheduled onto say MPO61. CG Dra continues to be monitored by a few people in the BAA but another set of results from the another time zone would be good. The lates BAA journal has an magazine has an article on CG Dra in it.
Stewart Bean

Comments on this proposal are closed.