Proposal #145

Proposer (37994) Enrique T. Boeneker ( obscode: BETB
Assigned To(3663) Dirk Terrell
Date SubmittedJuly 18, 2020

AS Cas (RA 00 25 37.82 - Dec +64 13 48.2) is a Cepheid Variable Star that has not been recently observed. The objective is to confirm the periodicity of the star (actually established at 3.02125 days), the difference of magnitude of the star itself (0.74), and to encourage other observers to follow up this star.
Due to the fact that the chart provided by our organization does not have comparison stars, I researched a few in SIMBAD that might be used as comparison stars, which are:
TYC-4023-1135-1 Vmag = 11.857 [0.033]
TYC-4023-608-1 Vmag = 11.393 [0.031]
TYC-4023-1060-1 Vmag = 10.042 [0.036]
TUC-4023-818-1 Vmag = 10.632 [0.036]
2MASS J00271228+6414252 Vmag = 14.444 [0.093]
GSC 04023-00919 Vmag = 13.113 [0.045]
This will allow me to make the difference apperture photometry with the Chart X25555TQ (2ยบ FOV).
The cadence suggested for these observations is twice a day (every night 2 observations 5 hours appart from one another) if it is possible for 30 consecutive days. This will help to confirm the periodicity of this star and it's cepheid-like nature. The filter suggested is the V filter: 20 subframes of 60 s each per observation properly calibrated will be required. The frames should be downloaded for further processing in the ftp server.

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
AS Cas 0.427172 64.23006 12.55–11.81 BSM_NH2 1 Jan. 17, 2021 No


(3663) Dirk Terrell — July 21, 2020, 11:50 a.m.

The TAC has some suggestions:

1) Contact the sequence team about getting a proper sequence, perhaps suggesting comparison stars to them.

2) Make BVRI observations to increase the return on investment. Once on the field, additional filters don't add much overhead.

(4726) Kenneth Menzies — July 21, 2020, 12:01 p.m.

Test plan generated and committed to NH, Hamren and NM. Runs once per night on each at moment to check exposure and resolution.

(4726) Kenneth Menzies — July 23, 2020, 2:14 p.m.

Plan revised to take two images per night. With the plan on three scopes, you may get extra data which will help generate better light curve.

Comments on this proposal are closed.