AAVSO: American Association of Variable Star Observers

Proposal #276

Proposer (45470) John Phillips (john.d.phillips@comcast.net) obscode: PJDB
Assigned To(3663) Dirk Terrell
Date SubmittedAug. 15, 2022

I am trying to reproduce the extinction example given in Appendix G of Astronomical Photometry (Henden & Kaitchuck 1982). In the example, this star was observed 12 times through the night at 30-minute intervals. While HR 8641 (omi Peg) is not the star used in the example, it is chosen since it is in Appendix A First Order Extinction Stars and rises, transits, and sets conveniently to cover a wide range of air masses from New Mexico in a single night. As a bright star, it will require short exposures, and it does not have any close neighbors to interfere with the photometry. This will also serve as my first proposal as a new AAVSO member.

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
HR 8641 22.695950 29.30768 4.79 BSM_TX 2 Feb. 14, 2023 No


(45470) John Phillips — Aug. 15, 2022, 6:48 p.m.

Sorry to have missed this, but the form did not ask for filters. The example given by Henden & Kaitchuck uses U, V, and B.

(3663) Dirk Terrell — Aug. 17, 2022, 7 p.m.

Suggestion is to use BSM_TX for u' filter and better horizon.

(4726) Kenneth Menzies — Aug. 18, 2022, 6:49 p.m.

Committed to TX. SU,B,V,R,I filters used. Will run every two days till October 15. Please advise when you have adequate data.

Comments on this proposal are closed.