Proposal #710

Proposer	(47688) Brian Scott (bnscott@mac.com) obscode: SBQ
Assigned To	(3663) Dirk Terrell
Date Submitted	July 14, 2026
Status	Allocated
Priority	Normal
Proposal	The R Coronae Borealis type variable NSV 11664 in Aqulia appears to be rapidly dimming. It is currently (as of 7/14/26) at around magnitude 14.9V, down from its historical maximum of around 13.5 to 14.0. I have been following it for a couple of months but if it dims much further it will start to get beyond the reach of my equipment, so I am hoping a scope in the AAVSOnet might start observing it. There are only a handful of observations of this star during a dimming episode in the AAVSO database so I think getting more data on it would be useful.

Targets

Target Name	RA (H.HH)	Dec (D.DD)	Magnitude	Observation Frequency	Expiration Date	Proprietary Term
NSV 11664	19.026022	14.93600	18.5–13.3	1	July 31, 2027	No

Plans currently in place

dso35/AAVSO_P710_SBQ_AUTO.csv

# $Id: AAVSO_P710_SBQ_AUTO.csv 5911 2026-07-24 18:37:46Z MZK $
#PROPOSAL=710
#REQUESTER=SBQ,,vphot
#target,hh,mm,ss.ss,dd,mm,ss.s,desc,priority,monitor,maxX,nrepeat,bin,[filter,exposure,nexp],[filter,exposure,nexp]
NSV_11664,19,1,33.68,14,56,9.6,NSV_11664,50,1,2,1,1,V,60,3,SI,50,3,EarliestTime=2026-07-14T00:00:00,LatestTime=2027-07-31T00:00:00

Comments

(47688) Brian Scott — July 20, 2026, 3:35 p.m.: NSV 11664 is continuing to dim, down to 15.426 TG by my observation last night (7/19/26).
(47688) Brian Scott — July 21, 2026, 4:04 p.m.: I forgot to include filter recommendations; I think certainly V and either I or R would be fine. I don't think a B filter is probably worthwhile since this star is quite red and if it dims much more it will be very faint in B, so B results might not have very good SNR.
(3663) Dirk Terrell — July 24, 2026, 5:11 p.m.: Ken will place it in the DSO35 queue.
(4726) Kenneth Menzies — July 24, 2026, 6:38 p.m.: Committed to dso35

Comments on this proposal are closed.