AAVSO: American Association of Variable Star Observers

Proposal #421

Proposer (45979) Petr Holecek (petr.holecek@protonmail.com) obscode: HPEE
Assigned To(3663) Dirk Terrell
Date SubmittedSept. 14, 2023

Name: Petr Holecek
Code: HPEE
Use of Data: Submitting data to AAVSO database after VPHOT analysis
Observation Cadence: Weekly
Filters required: B,V,I

Please, send me photos directly to VPHOT, thank you very much !

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
W Dra 18.092953 65.94906 15.4–8.9 BSM_NH2 5 March 21, 2024 No


(3663) Dirk Terrell — Sept. 18, 2023, 4:05 p.m.

Petr, W Dra is ok but we don't recommend Z Tau because of the difficulties getting good data with aperture phometry. Arne and I, along with Walt Cooney and John Gross, looked at it a few years back and discovered that there were some close companions that interfered with the photometry in a significant way. We had to do PSF fitting to get good data. You can read our paper at


Also, it would be good when submitting proposals to give the allocation committee some justification for choosing your targets. Why do you want to observe these two stars?

(45979) Petr Holecek — Sept. 18, 2023, 5:36 p.m.

Hi Dirk,
excuse me, I wanted to have these Mira stars in the observing program because their photometry has been done for a long time, mainly visually. my goal was to contribute to the AAVSO database. I am currently quite busy at work and do not do photometry with my own telescope. I agree with the elimination of the Z Tau, that would be quite difficult for me...

(3663) Dirk Terrell — Sept. 18, 2023, 7:08 p.m.

Ok, thanks for the feedback, Petr. Is there another target you'd like to substitute for Z Tau?

(45979) Petr Holecek — Sept. 18, 2023, 7:17 p.m.

Not yet, thank you. I need some time to find a suitable targets that make sense to monitor using AAVSONET... Thank you very much for your support...

(3663) Dirk Terrell — Sept. 18, 2023, 7:25 p.m.

Ok, we'll go ahead and approve the observations of W Dra.

(4726) Kenneth Menzies — Sept. 23, 2023, 6:24 p.m.

Committed to NH.

Comments on this proposal are closed.