AAVSO: American Association of Variable Star Observers

Proposal #185

Proposer (37929) Peter Bealo (pbealo@comcast.net) obscode: BPEC
Assigned To(3663) Dirk Terrell
Date SubmittedJan. 22, 2021

Name: Peter Bealo
Code: BPEC
Observation Use: Follow up observations of recently classified UXOR variable. Suggested by M Kenworthy, Univ. of Leiden and E. Mamajek, NASA JPL
Use of Data: Submit to AAVSO Database after VPhot analysis
I request that images be sent to VPhot
Target Star: ASASSN-V J170615.23-322944.7 in SCO
Magnitude Range: 12. – 13.5 mag
Comp Stars: from X26038AIA chart – 104, 129, 139, 125 I'll deal with these in VPhot NOTE: Comp/Check stars are 10’ – 20’ from variable, consider this when assigning to telescopes please!
Observation Cadence: Daily if time is available
Filters Required: B, V, R, I
Number of Exposures per Run: 3X per filter
Exposure Times: Site Owner's Best Guess initially, will review following 1st observing run
Start Date: Mar 1, 2020
End Date: TBD

Target RA (H.HH) Dec (D.DD) Magnitude Telescope Observation Frequency Expiration Date Proprietary Term
ASASSN-V J170615.23-322944.7 in SCO 17.104231 -32.49575 12.0–13.5 BSM_Berry Aug. 4, 2021 No


(3663) Dirk Terrell — Jan. 27, 2021, 4:07 p.m.

Comments from Arne:
"The field is a bit crowded, so plenty of nearby comp stars but unknown if there might be a close companion or two. At -32, this is a tough field for northern telescopes, but doable. It is too faint, and the field is too crowded, for the current Australian BSMs - this situation will improve when they start using the E180's. I think Peter should ask the Sequence Team for comp stars closer to the target so that other telescopes, such as OC61, can be used. I'd also like at least a deep snapshot from TMO61 or OC61 to look for close companions, to help in understanding the amplitude of any variation in the target."

(37929) Peter Bealo — Feb. 1, 2021, 7:57 p.m.

I was wondering if this would be a problem. I'll ping the sequence team as soon as I figure out how! I saw it somewhere on the site in the past, just hadn't done so yet.

(2108) Arne Henden — Feb. 2, 2021, 11:31 a.m.

If you go to
under the Variable Star Plotter banner is a link to "request a sequence"

(37929) Peter Bealo — Feb. 2, 2021, 2:04 p.m.

Wow, quick work on developing a sequence. Looks great. A couple stars may be problematical due to close companions, but several don't have that possible issue.

(4726) Kenneth Menzies — Feb. 5, 2021, 6:25 p.m.

Committed to Berry and OC61.

(37929) Peter Bealo — March 28, 2021, 10:02 p.m.

The individual images from Berry2 of ASASSN-V J170615.23-322944.7 and ASASSN-V J181654.06-202117.6 are really nice, and I see no need for as many images as in the plan for binning. I have no idea how "booked up" that system is, but I think I can return about 30 min per observing night to use for whatever else may be in queue without affecting the quality of the data I report out.

Both variables use the same exposure series: qty 5 B 180 sec exposures, qty 3 V 120 sec, qty 3 R 120 sec and qty 3 I 120 sec images.

I'd be comfortable backing down to Qty 2 B 180 sec, qty 2 V 120 sec, qty 2 R 120 sec and qty 2 I 120 sec images.

If you think this is a good idea I'll make that note on the 185 and 186 proposal forms by Monday.
All the Best,

Comments on this proposal are closed.