AAVSO: American Association of Variable Star Observers

Proposal #194

Proposer (37929) Peter Bealo (pbealo@comcast.net) obscode: BPEC
Assigned To(3663) Dirk Terrell
Date SubmittedFeb. 12, 2021

Name: Peter Bealo
Code: BPEC
Observation Use: Alert Notice 729.
Use of Data: Submit to AAVSO Database after VPhot analysis
I request that images be sent to VPhot
Target Star: V406 VUL
Magnitude Range: 16. – 21 mag
Comp Stars: from X26198ALP chart – 151, 164, 170, 161
Observation Cadence: Daily if time is available
Filters Required: B, V, R, I
Number of Exposures per Run: 2X per filter
Exposure Times: Site Owner's Best Guess initially, will review following 1st observing run
Start Date: Immediately
End Date: TBD

Target Name Right Ascension Declination Minimum Magnitude Maximum Magnitude Keep Proprietary Proposal
V406 VUL 18 58 41.51 +22 39 30.2 21 16

Note: Seems a good target for the NM 60cm...

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
V406 VUL 18.978197 22.65839 21.0–16.0 TMO61 daily Aug. 12, 2021 No


(3663) Dirk Terrell — Feb. 12, 2021, 7:35 p.m.

The TAC has approved this proposal.

(4726) Kenneth Menzies — Feb. 13, 2021, 6:22 p.m.

Committed to TMO61

(37929) Peter Bealo — Feb. 13, 2021, 6:58 p.m.

Thanks Gentlemen.

(37929) Peter Bealo — March 16, 2021, 3:29 p.m.

It seems that V0406 VUL is down near its quiescent at 20 mag or maybe less. So taking 40 min per run of telescope time is a waste, we just won't see it, especially with trailed images and stars painting more pixels.

How about changing filter use and exposure time with dual goals of A) spotting V0406 as soon as it begins its next outburst and B) Obtaining useful photometric data in the primary band, V, when it outbursts.

I'm thinking 4 ea 150 sec C filter exposures and 4 each 150 sec V exposures per observing run. This reduces observing time by half, increases chance of seeing V0406 near or at quiescence for monitoring purposes and produces data in the primary band while its as faint as possible. I'm also hoping that with less/no trailing we'd achieve more photons per pixel, thus increasing chance of capturing it as well. I guess the price paid is that we can't produce transformed data.

Comments on this proposal are closed.