AAVSO -- Proposal #443

Proposer	(3522) Bart Staels (staels.bart.bvba@pandora.be) obscode: SBL
Assigned To	(3663) Dirk Terrell
Date Submitted	Oct. 21, 2023
Status	Allocated
Priority	Normal
Proposal	PW Gem is an extremely eccentric EA system. November 27th is an ideal opportunity to monitor the eclips. Ephemeris: 00:51 UT start / 06:17 UT mid / 11:43 UT end (cfr. VSX) I have scheduled monitoring with the 20" TAGRA telescope in the south of Spain, but from here I can only get the start of the eclips till approximately the mid (timezone is UT+1). I want to see if there is any color change detectable during the eclips. That's why I scheduled 10 exposures in SG, followed by 2 in SR, 2 in SI and 2 in SZ, and repeating that pattern all night till dawn. Is it possible to have an AAVSONet telescope (TMO61, MPO61) scheduled for a similar time series, in order to have data on the second part of the eclips? Many thanks in advance! Bart

Targets
Target	RA (H.HH)	Dec (D.DD)	Magnitude	Telescope	Observation Frequency	Expiration Date	Proprietary Term
PW Gem	6.266706	23.78322	9.51–9.11	BSM_NM	0	May 5, 2024	No

Comments

(3663) Dirk Terrell — Oct. 26, 2023, 2:48 p.m.

At this brightness, the system can be easily observed by the BSM systems. We will schedule it there unless you have a strong argument against it? We should also try to observe the secondary eclipse. According to Sebastian:
"the most luminous star is eclipsed by its companion for almost 11 hs. and the combined brightness drops by 0.40 magnitudes. 3 days and 21 hs. later, the secondary eclipse begins and it is 3 times longer (1 d. 11 h. and 44 m.) with a drop of 0.35 mag."

(3522) Bart Staels — Oct. 26, 2023, 3:10 p.m.

Ok, that's fine to me. Thanks!

(4726) Kenneth Menzies — Oct. 26, 2023, 7:16 p.m.

So, TAC is proposing we use one BSM scope for ONE project ALL night, which happens to be tonight!

(4726) Kenneth Menzies — Oct. 26, 2023, 7:17 p.m.

Is the weather clear tonight in Spain??

(4726) Kenneth Menzies — Oct. 26, 2023, 7:21 p.m.

IMHO, this is pushing the definition of a SHARED resource and a little presumptuous of my time!

(3663) Dirk Terrell — Oct. 26, 2023, 7:28 p.m.

The proposal says November 27, not October, so we have plenty of time. In my mind, this is one of the better justified targets I've seen in a while, but I'll freely admit my EB bias.

(4726) Kenneth Menzies — Oct. 26, 2023, 7:29 p.m.

AHH! It's November not October!!!

(4726) Kenneth Menzies — Oct. 26, 2023, 7:44 p.m.

Bart: NH and NM both have sg, sr; si. NH has zs. Is zs necessary? Which fits better with your time interval (NH or NM)? Weather is obviously just a GUESS!! Do you really need secondary eclipse? Are you watching it too?

(3663) Dirk Terrell — Oct. 26, 2023, 7:50 p.m.

Speaking from the astrophysical analysis standpoint, having the secondary eclipse is a huge plus.

(3522) Bart Staels — Oct. 26, 2023, 7:57 p.m.

SZ can be cancelled
yes, I'm monitoring it already on a daily basis with the 20" TAGRA and will continue this till the end of the year

(3663) Dirk Terrell — Oct. 26, 2023, 9:06 p.m.

Looking at the TESS schedule, it looks like it will cover the eclipses in sector 72.

(3000) Sebastián Otero — Nov. 3, 2023, 5:59 p.m.

These are the predicted times for the secondary eclipse:

2460279.8640 Dec. 1, 2023 08:44 UT Beginning
2460280.6024 Dec. 2, 2023 02:27 UT Mideclipse
2460281.3408 Dec. 2, 2023 20:11 UT End

(4726) Kenneth Menzies — Nov. 7, 2023, 6:26 p.m.

Committed to entire nights on NM. Both 11/27 and 12/02

Short Test run initially to check exposures. Bart -- Make sure you confirm test exposures before eclipses.

(3522) Bart Staels — Nov. 12, 2023, 10:33 a.m.

BSM_NM2:
SNR SG ~ 80
SNR SR ~ 70 à 90
SNR SI ~ 95
This iis based on only a few images; I'll check again when more images are available.

Comments on this proposal are closed.