AAVSO: American Association of Variable Star Observers

Proposal #224

Proposer (37207) Brian Ramey (ramey.brian@gmail.com) obscode: RBCA
Assigned To(3663) Dirk Terrell
Date SubmittedAug. 10, 2021

In support of Alert 752: RS Oph in outburst. Provide V,B,I filter transformed photometry to AAVSO database.

Observer: RBCA
Data photometry: VPHOT
Results: Upload to AAVSO database
Target: RS Oph
Mag: 4.3 - 12.5
Exposure time strategy: Use dual exposure time with shorter time used while near outburst max, then move to longer time as mag declines over time.
Filters + (exposure time): B(15/45sec), V(15/45 sec), I (15/45 sec)
Total number of exposures per filter: 24 (12 at each time exposure)
Time series photometry to be performed.
Start date: ASAP (outburst is close to max now)
End date: Sept 30, 2021 or until outburst is completed

Proposal submitted by: Brian Ramey
Observer Code: RBCA

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
RS Oph 17.836992 -6.70794 12.5–4.3 BSM_Berry 1 Feb. 12, 2022 No


(4726) Kenneth Menzies — Aug. 16, 2021, 9:36 p.m.


What do you really mean by time series photometry? Do you simple want a few daily images that you will stack and subsequently follow over its decline from max outburst. Why did you ask for so many images per filter per night? I have not done that initially based on what I think you want.

I have committed to NH, NM and Berry. It's low in NH so we will see what happens. NM and Berry will work better.

Check how the exposures work, both short and long.


(37207) Brian Ramey — Aug. 16, 2021, 10:28 p.m.

Hi Ken, Thanks much for setting this up. The number of images was based on my experience using NM2 on SS CYG, which has a similar minimum (12.5). I typically get 8 - 24 images per night for that one (# of exposures vary night to night). Having fewer images while RS Oph is just close to outburst should be fine. I thought a time series might be interesting to see if there was any light modulation as it declined, but this was not ask for in the alert, so not required. I'll take a look at the first set of data and let you know how the exposure time vs SNR looks. I'm betting that what you set up will work just fine.


(37207) Brian Ramey — Aug. 28, 2021, 2:53 p.m.

HI Ken, the 5,10,5 (V,B,I) look good RS Oph. Thanks.

(37207) Brian Ramey — Oct. 16, 2023, 3:41 p.m.

This project is complete. You can remove RS Oph from the target list. Thanks!

(4726) Kenneth Menzies — Oct. 17, 2023, 5:22 p.m.

Done. Thanks for your work on the project.

Comments on this proposal are closed.