Proposal #370

Proposer (45802) Mikhail Ashchepkau (ashchepkau@gmail.com) obscode: AMIF
Assigned To(3663) Dirk Terrell
Date SubmittedJune 19, 2023
StatusDeclined
PriorityNormal
Proposal

Dear AAVSO, I would propose dual observations of MS Aql field with interval about 1 week. There are a lot of SR vars in the field, but ASASSN-V 194033.04+115216.7 is suspicious: my photometry in CV gives 13-14m (close to VSX), but ASASSN-V light curve shows brightness about 15V or less. Other measured 10 stars in 30-min field do no have such high difference. I hope, pair of R-V-B images taken with BSM or even MPO will help to get reliable data.

Plate name: MS Aql
Plate center: 295.27962 +11.81392
Range: 9.5-16V
Main target: ASASSN-V 194033.04+115216.7 (about 15V by ASASSN-V)

Targets
Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
ASASSN-V 194033.04+115216.7 19.675844 11.87133 15.5–14.5 No

Comments

(3000) Sebastián Otero — June 19, 2023, 3:56 p.m.

Mikhail, the difference in magnitude you are talking about is just a problem with the pre-processed magnitudes in the latest version of the ASAS-SN variable stars database.
The numbers in VSX came from the original processing and they were correct. I don't know what they did more recently to end up with such faint magnitudes.
The Sky Patrol data shows the correct range.
I updated the VSX page with data from different surveys and the range is V= 13.4 - 14.1.
So the primary justification for the proposal is no longer valid.
The star is a run of the mill semirregular red giant. Do you still want to observe it, now that you know that the difference is just an artifact of the ASAS-SN procesing?

(45802) Mikhail Ashchepkau — June 19, 2023, 4:53 p.m.

Thank you, Sebastian! Yes, Patrol shows 15g but not V. Proposal is not valid.

I will continue to observe this nice field with my modest equipment :)

Comments on this proposal are closed.