Proposal #504

Proposer	(44173) Justus Randolph (justusrandolph@gmail.com) obscode: RJUB
Assigned To	(3663) Dirk Terrell
Date Submitted	May 3, 2024
Status	Declined
Priority	Normal
Proposal	I propose an exoplanet transit observation of HIP 41378 f, a known super-puff planet. It has a period of 542 days, so chances to observe it are rare. Here is some information about transit times and location, which was based on a call from the Unistellar slack site. The observation period is from May 7 at UTC 18:27 and ends on May 9 at UTC 01:27 begins on May 8 at UTC 05:18 and ends on May 9 at UTC 16:17. The expected ingress starts at 05/08 at 13:18 UTC and the ingress at 5/09 at 08:17 UTC. Times near the predicted ingress and egress would be more important, but anytime during the observing would beneficial. Ideally, the observations should be at least four-hours long. If this proposal is successful, I would analyze the data using AstroImageJ and submit to the AAVSO's exoplanet database.

Targets
Target	RA (H.HH)	Dec (D.DD)	Magnitude	Telescope	Observation Frequency	Expiration Date	Proprietary Term
HIP 41378 f	8.440833	10.08037	8.93	MPO61	—	—	1 Year

Comments

(4726) Kenneth Menzies — May 4, 2024, 12:45 a.m.

Your 2 sentences above about observation period do not make sense to me? Clarify?

(44173) Justus Randolph — May 5, 2024, 7:49 p.m.

Hi Kenneth. More information on this special call was recently submitted by Karen Collins. Therefore, I intend to submit a new proposal request in just a few minutes. That new request will have more specific instructions about the observation period.

(44173) Justus Randolph — May 5, 2024, 9:22 p.m.

Hi Kenneth,

I wasn't sure if I should have created a new/amended proposal now that I received more specific information on the TFOP SG1. I figured that I should, so I created a new proposal (#506) that was assigned to Dirk Terrel. I'm sorry for the duplication if it causes an inconvenience.

(44173) Justus Randolph — May 5, 2024, 9:25 p.m.

By the way, here is a clarification about the period. It comes from an SG1 TFOP call from Karen Collins. I hope that this helps!

Copy of SG1 TFOP Call sent by Karen Collins--

Hi SG1 northern and southern hemisphere observers,
We have a special request from Zoë de Beurs and team for observations of known planet HIP 41378 f, which has orbital period P = 542 days. The next transit event is coming up in 2-3 days. The main goal with these observations is to prepare for a JWST proposal that would investigate this planet. Anyone who contributes useful data will be invited to join the JWST proposal and would be invited as coauthor on any resulting paper.

The target Dec is + 10, so it is observable from most observatory locations in the north and south.
RA = 08:26:27.849
Dec = +10:04:49.34

The target star is bright at V = 8.93 and the depth is 5 ppt, so most SG1 observatories can probably detect the event.

Use a red (r', R, i', I, z, Y, CBB) filter that gives the best photometric precision for your instrumentation.

Given the bright target star, you may want to offset your field to catch other bright comparison stars.

The transit duration is 19 hours, so we are hoping to detected ingress and egress independently from different observatory locations.

The timing uncertainty is +/- 6 hours due to TTVs. Since the TTF currently triggers only on nominal ingress and egress times, there are 5 different ephemerides on the TTF, each shifted by 3 hours over the +/- 6 hour range. The five ephemerides are named:

TIC 366443426.53 (TOI-4304.53) - 6 hours early ephemeris
TIC 366443426.54 (TOI-4304.54) - 3 hours early ephemeris
TIC 366443426.55 (TOI-4304.55) - nominal ephemeris
TIC 366443426.56 (TOI-4304.56) - 3 hours late ephemeris
TIC 366443426.57 (TOI-4304.57) - 6 hours late ephemeris

Three or more hours of observations over the time range below might be useful to detect or rule out an ingress or egress:
UTC 2024-05-08 04:00 through 2024-05-09 15:00

(44173) Justus Randolph — May 7, 2024, 4:09 a.m.

Karen Collins announced yet another important revision to the ephemeris for the exoplanet campaign to observe the HIP 41378 f. This revision supersedes all previous announcements. Here is the text of the TFOP SFG1 Announcement sent by Karen Collins. It refers to RED text. I'll indicate red text with << >>.

Alternately, you might be able to view this discussion in context at the following URL:

https://groups.google.com/g/tfop-sg1-announce/c/HT6Wug214yU/m/bof_M3BzAQAJ?utm_medium=email&utm_source=footer&pli=1

I'm sorry for all the changes. I'm struggling to keep up with them myself!

=======
'Karen Collins' via TFOP SG1 Announcements <tfop-sg1-announce@googlegroups.com>

Hi SG1 northern and southern hemisphere observers,

THE EPHEMERIS SENT YESTERDAY HAS BEEN REVISED. THE TTF PREDICTIONS HAVE BEEN UPDATED, BUT IN CASE YOU ARE REFERENCING THE OBSERVING TIME RANGE BELOW, SEE THE UPDATED TIMING IN RED. <<THE UPDATED OBSERVING TIME RANGE IS ROUGHLY HALF A DAY EARLIER.>>

We have a special request from Zoë de Beurs and team for observations of known planet HIP 41378 f, which has orbital period P = 542 days. The next transit event is coming up in 2-3 days. The main goal with these observations is to prepare for a JWST proposal that would investigate this planet. Anyone who contributes useful data will be invited to join the JWST proposal and would be invited as coauthor on any resulting paper.

The target Dec is + 10, so it is observable from most observatory locations in the north and south.
RA = 08:26:27.849
Dec = +10:04:49.34

The target star is bright at V = 8.93 and the depth is 5 ppt, so most SG1 observatories can probably detect the event.

Use a red (r', R, i', I, z, Y, CBB) filter that gives the best photometric precision for your instrumentation.

Given the bright target star, you may want to offset your field to catch other bright comparison stars.

The transit duration is 19 hours, so we are hoping to detect ingress and egress independently from different observatory locations.

Two or more hours of observations over the time range below might be useful to detect or rule out an ingress or egress:
<<UTC 2024-05-07 18:00 through 2024-05-09 04:00>>

Cheers,
Karen

(4726) Kenneth Menzies — May 7, 2024, 7:31 p.m.

Weather at mpo61 poor tonight. No luck for proposal. Sorry.

(44173) Justus Randolph — May 7, 2024, 9:07 p.m.

Thank you anyway, Kenneth. It was good practice for me to see how the proposal process works. I've learned to keep any modifications in the comments and not a new proposal (my apologies once again). I'll keep my eye out for important TFOP SG1 calls or interesting targets and submit more proposals in the future.

(4726) Kenneth Menzies — May 9, 2024, 5:12 p.m.

FYI. Transits are tough unless you provide a long lead time. It usually takes 1-2 weeks to get a plan on the scope queue. They require long time series which suck up valuable scope time. The special SG1 projects usually don't provide such lead time.

Ken

(44173) Justus Randolph — May 14, 2024, 12:36 p.m.

Thank you for the information. I'll keep trying, especially if there is a good lead time.

Comments on this proposal are closed.