AAVSO: American Association of Variable Star Observers

Proposal #308

Proposer (35057) Andrew Corkill (viram@charter.net) obscode: CANG
Assigned To(3663) Dirk Terrell
Date SubmittedDec. 30, 2022

Target: T CrB
Variable Type: NR + ELL
Recurrent novae and Rotating ellipsoidal variable

Magnitude Range: 2.0 – 10.8 V
Current visual magnitude is around 10.0.

Background: T CrB is has gone through a sustained brightening period in 2016 and recently gone through a small stabilization period (2021). It is due to go Nova within the next couple of years if it follows similarly to its previous out burst in 1946.
Proposal: Nightly Observations of T CrB from January 2023 to January 2025. At least one (1) observation per night, but an optimal series of 3 per night as telescope time and telescope location permit.

Objective: Monitor T CrB in advance of its upcoming outburst and record unusual behavior both visually and in the B, V, R & I band using CCD's. These observations will help further refine and understand the outburst cycle. Also to obtain high quality photometry during an outburst which is probable to occur in the next 2 years and to provide Professional astronomers with this data on T CrB. I will be monitoring also with visual observations over the next two years to supplement the CCD observations.

Filters: B, V, R, I (2 images per filter)

Images delivered to VPHOT for analysis and upload to AAVSO.

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
T CrB -4.410000 12.02300 10.8–2.0 BSM_NM 1 July 8, 2023 No


(35057) Andrew Corkill — Dec. 30, 2022, 12:57 a.m.

FYI - The RA and DEC was copied incorrectly.
Revise to: 15 59 30.16 +25 55 12.6

(3663) Dirk Terrell — Dec. 30, 2022, 5:26 p.m.

From Arne:
"I note that T CrB was an HST object in 2021, and Brian Ramey had a proposal (P223) for it. That proposal was only for 6 weeks, yet I see P223 still enabled on BSM_NH2. I recommend it be turned off and Corkill's proposal enabled instead."

(4726) Kenneth Menzies — Jan. 9, 2023, 2:40 p.m.

Committed to NH and NM.

(4726) Kenneth Menzies — Jan. 9, 2023, 2:43 p.m.

P223 archived in NH.

(35057) Andrew Corkill — July 1, 2023, 2:38 a.m.

Hi Ken and Team - Can we continue the allocation on this proposal for another 6 months? The Expiration Date is coming up soon and we should continue monitoring T CrB.
Thanks - Andrew

(4726) Kenneth Menzies — July 16, 2023, 4:21 p.m.

actually no end date in plan.

Comments on this proposal are closed.