Proposal #627

Proposer	(35150) Dr. Pradip Karmakar (pradipkarmakar39@gmail.com) obscode: KPRB
Assigned To	(3663) Dirk Terrell
Date Submitted	July 17, 2025
Status	Accepted
Priority	Normal
Proposal	Dear Sir, I would like to get the ccd images of the Cepheids from the project " THE CLSSICAL CEPHEID PROGRM " BY THOMAS A. CRAGG ( Cragg T. 1972 JAAVSO ) of the following variable stars only in V-filter. Target RA (H.HH) Dec (D.DD) Magnitude VX Per 2.13013333333333 58.44353 8.99 - 9.69 V SZ Cas 2.45382533333333 59.46061 9.61 - 10.03 V SV MON 6.357308 6.47017 7.61 - 8.88 V T MON 6.420278 7.08572 5.58 - 6.58 V zet Gem 7.06848066666667 20.57031 3.62 - 4.18 V RU Cam 7.36225533333333 69.67075 8.1 - 9.1 V X Pup 7.54639733333333 -20.90969 7.86 - 9.17 V W VIR 13.433886 -3.37872 9.46 - 10.75 V AL VIR 14.1858473333333 -13.31067 9.10 - 9.92 V RX LIB 15.7000153333333 -20.77942 11.6 - 13.4 V AV SGR 18.0802166666667 -22.73244 10.67 - 12.1 V RU SCT 18.6989946666667 -4.11067 8.84 - 9.96 V Z SCT 18.7159113333333 -5.82089 9.05 - 10.16 V V336 AQL 19.0221473333333 0.14703 9.5 - 10.28 V SZ Aql 19.0776166666667 1.30617 7.92 - 9.20 V TT Aql 19.1371526666667 1.29867 6.53 - 7.65 V SV Vul 19.858586 27.46025 6.72 - 7.79 V Filter used: V Hope you consider my request. With regards, Pradip Karmakar

Targets
Target	RA (H.HH)	Dec (D.DD)	Magnitude	Telescope	Observation Frequency	Expiration Date	Proprietary Term
VX Per	2.130133	58.44353	8.99–9.69	—	—	—	No
SZ Cas	2.453825	59.46061	9.61–10.03	—	—	—	No
SV MON	6.357308	6.47017	7.61–8.88	—	—	—	No
T MON	6.420278	7.08572	5.58–6.58	—	—	—	No
zet Gem	7.068481	20.57031	3.62–4.18	—	—	—	No
RU Cam	7.362255	69.67075	8.1–9.1	—	—	—	No
X Pup	7.546397	-20.90969	7.86–9.17	—	—	—	No
W VIR	13.433886	-3.37872	9.46–10.75	—	—	—	No
AL VIR	14.185847	-13.31067	9.1–9.92	—	—	—	No
RX LIB	15.700015	-20.77942	11.6–13.4	—	—	—	No
AV SGR	18.080217	-22.73244	10.67–12.1	—	—	—	No
RU SCT	18.698995	-4.11067	8.84–9.96	—	—	—	No
Z SCT	18.715911	-5.82089	9.05–10.16	—	—	—	No
V336 AQL	19.022147	0.14703	9.5–10.28	—	—	—	No
SZ Aql	19.077617	1.30617	7.92–9.2	—	—	—	No
TT Aql	19.137153	1.29867	6.53–7.65	—	—	—	No
SV Vul	19.858586	27.46025	6.72–7.79	—	—	—	No

Comments

(3663) Dirk Terrell — July 17, 2025, 8 p.m.

The TAC will have several questions:

1) What is the desired cadence of the observations?
2) How long does each system need to be observed? Weeks? Months?
3) Have you looked to see if these systems have been observed by projects like ASAS-SN?
4) What is the motivation for making these observations?

In order to maximize the scientific return, we would like to see observations made in multiple filters like BVI.

(35150) Dr. Pradip Karmakar — July 18, 2025, 6:38 a.m.

Dear Sir,
Here are my answers.
1) Exposure time: 10sec-60sec
2) Start date: 21st July'25
End date: 31st July'26
3) I must see the ASAS-SN database for the observations records
of the target stars
4) I would like to re-analysis like Craggy T. 1972, JAAVSO.
Previous that I would like to use VPhot and VStar for photometry and time of maximum brightness.

I am requesting you to use BVI filters for observations purposes.
With regards,
Pradip Karmakar
P

(3663) Dirk Terrell — July 22, 2025, 5:58 p.m.

#1 was about cadence, not exposure time, cadence meaning one set of observations per day, once per week, etc.

(35150) Dr. Pradip Karmakar — July 22, 2025, 7:49 p.m.

cadence is 12 observations per day if possible.

(3663) Dirk Terrell — July 23, 2025, 4:17 p.m.

It would help us immensely if we better understand what you are trying to achieve. 12 observations per day is a lot for longer period systems like these and difficult for us to schedule. Cepheids have pretty smooth light curves, so dense sampling doesn't seem necessary but knowing what exactly you are trying to do with these data would help us understand what is really necessary.

(35150) Dr. Pradip Karmakar — July 23, 2025, 4:40 p.m.

Dear Sir,
My intention is to follow up the Cragg T. 1972 JAVSO paper. I would like to find the time of maximum light with the recent observations. Regarding cadence of the observations is upto you. That's which you feel better for this purpose. I am requesting you just only use V and I filters for observations. Hope you consider my proposal.
With regards,
Pradip Karmakar

(3663) Dirk Terrell — July 30, 2025, 2:44 p.m.

Ok, how about we observe a few of the targets that are currently visible once per day and see how that goes? Then we can see if that works well enough for your needs.

(35150) Dr. Pradip Karmakar — July 30, 2025, 3:23 p.m.

Dear Sir,
I am agree with you good suggestions.
With regards,
Pradip Karmakar

(35150) Dr. Pradip Karmakar — Aug. 1, 2025, 6:01 p.m.

Dear Sir,
Should I get that observations in BVI filters or in V filter only?
With regards,
Pradip Karmakar

(3663) Dirk Terrell — Aug. 1, 2025, 8:57 p.m.

We would prefer to get BVI observations to enhance the scientific return.

Comments on this proposal are closed.