AAVSO: American Association of Variable Star Observers

Proposal #365

Proposer (37032) Eric Fabrigat (astronomicom1@yahoo.fr) obscode: FERA
Assigned To(3663) Dirk Terrell
Date SubmittedMay 29, 2023

Observation Use: legacy progam, low observed
1 exposure per 5 night
Filter Requested: B, V, R, I
Start Date : around 10/05/2023
End date : 31/10/2023
Images delivered to Vphot for analysis and upload.

best regards

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
V404 CYG 20.401060 33.86722 20.0–17.0 MPO61 5 Oct. 31, 2023 No


(3663) Dirk Terrell — June 2, 2023, 7:21 p.m.

From Arne:
"James Foster monitored this LMXB target a couple of years ago, perhaps for Alert Notice 592. The proposer should use the finding chart in that AN, as there is a very close companion. In addition to that, the data from FJQ indicates that this target lives around V=18-19 unless in outburst. So quality photometry is going to be very difficult, and will require the 60cm telescopes. In 60seconds, you can get SNR=100 on V=16 with a 60cm telescope. So to get decent signal/noise, I'd suggest at least 3x 3min at V and scale accordingly for the other filters. Perhaps the requester should get a night or two and demonstrate that they are able to use the images effectively before assigning a long-term monitoring program for this object."

(4726) Kenneth Menzies — June 4, 2023, 8:52 p.m.

Committed one night on mpo61 in V for you to check photometry. Advise if it works?

(37032) Eric Fabrigat — Aug. 6, 2023, 12:02 p.m.

Hello, I received V images from MPO061. Photometry analysis shows behaviour around magnitude 18 in V. Photometry analysis could not be ended because there is no B images. Up to you to decide if you want to continue. best regards. FERA.

(4726) Kenneth Menzies — Aug. 7, 2023, 4:54 p.m.


You requested this proposal. Do you want to continue? What sort of SNR did you get for the V images? The B images will be more difficult. R and I images might be acceptable. You could submit just the V data.

BTW, MPO61 had hardware problems from a lightning strike. That's why you just got images!


(37032) Eric Fabrigat — Aug. 8, 2023, 10:54 a.m.

the SNR is 28 for 300s exposure. that seems to be very faint/difficult target. We can stop this request, I will find another target, could you have an idea about an interresting target ? (something usefull for community).
Best regards. Eric

Comments on this proposal are closed.