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TYC 2483-160-1 - Exoplanet candidate observation alert

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weo
weo's picture
TYC 2483-160-1 - Exoplanet candidate observation alert

AAVSO Alert Notice 704 announces an urgent observation alert for the exoplanet candidate system TYC 2483-160-1 for THIS EVENING, 2020 MAY 6. Please see the notice for details and observing instructions.

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

hjw
hjw's picture
TYC 2483-160-1 - Exoplanet candidate observation alert

Can anyone suggest some comparison stars or how soon we could get a sequence for this star.

Thanks

dennis-conti
dennis-conti's picture
Comparison stars

Hi John,

At least one good comp star is due West of the target with approx. same mag and color. Its catalog designation isTycho 2483-165 at RA 08:35:06.6, DEC 31:32:15.5. Let me know your FOV and I will suggest some others.

Dennis

hjw
hjw's picture
Comparison stars

Thanks Dennis,

My FOV is approx 24X24 arcmin.

CTX
CTX's picture
TYC 2483-160-1 Sequence

TYC 2483-160-1 Sequence is now available for observers.

Tim Crawford, Sequence Team

dennis-conti
dennis-conti's picture
Comparison stars

Tim: thanks for the sequencing.

John: you should now be able to use VSP to get comparisons stars for your FOV.

Dennis

hjw
hjw's picture
Comparison stars

Thanks Tim and Dennis. I got it!

Sebastian Otero
Sebastian Otero's picture
Ephemeris for tonight's eclipse

Hello all,
an updated ephemeris for mideclipse is tonight at 03.00 UT.
The eclipse depth is around 0.8 mag. so it is very easy to detect.

Good observing!

Sebastian
 

cdk
Color index for object?

Anyone know the color index for the object: tyc 2483-160-1 which I assume is the same star as the designation Tycho 2483:160?

Don

Sebastian Otero
Sebastian Otero's picture
B-V color index

It has B-V= 0.62 according to APASS.

Cheers,
Sebastian

econseil
econseil's picture
Hi,

Hi,

With a mid-eclipse ephemeris at 03:00 UT and an eclipse duration of about 06h40, I expected a start of ingress around 23:40 UT because exoplanet transit lightcurves are usually symetrical.

Here in Europe, the target was very low and I just planned to see the ingress. But at first glance, I see a flat lightcurve during my whole session, from 22:18 UT to 00:26 UT

 

Emmanuel

dennis-conti
dennis-conti's picture
Attempt

Hi Emmanuel,

Thanks for the attempt. Will see if any North American observers have had better luck. Please hold on to your images for the time being, however.

Thanks again.
.
Dennis
Chair, AAVSO Exoplanet Section

Sebastian Otero
Sebastian Otero's picture
Eclipse

Hi Emmanuel,
The main event was a deep eclipse not a transit. The eclipse duration was actually 5.8 hours so you should have caught a slight fading the last 20 minutes of your session.

Cheers,
Sebastian

WBY
WBY's picture
Success

Dennis,

PJMO captured a light curve of the primary eclipse from about 02:23:16 UT until we stopped just before the telescope hit its altitude limits at 06:04:18 UT. Below is a rough preliminary flux LC in R @ 10 sec EXPTIMES produced real time with the images calibrated by darks only. We didn't take flats until after the run. There were 3 anomalous images that produced the three spikes.

If life doesn't get in the way, I should have a final LC uploaded to AAVSO today. 

Brad Walter, WBY

dennis-conti
dennis-conti's picture
Success

Hi Brad,

I have asked Jerome Orosz (of SDSU) how he would best like to have the results conveyed to him. Will let you know when I hear back.

Thanks for doing the observation - looks great.

Dennis

WBY
WBY's picture
Final PJMO Light Curves

Thanks Dennis.

The PI may want the AIJ output files in addition to the WebObs data. If they want the original images we can also upload those to an sftp site. 

I noticed the RHM R filter LC  was very similar in shape over the common time range spanning the minimum but offset 0,3+ (oops dropped the decimal point initially) magnitudes (fainter) from the PJMO  R magnitude LC. APASS only has B and V magnitudes for this star but Gaia has observations in all of its normal filters and they transform to a value of 9.832 R mag. The PJMO R mag LC appears consistent with the R mag derived from Gaia data. and the average of 119 check star measured R magnitudes for the run was substantially less than one standard error from the R mag for the 119 check star in the VSP sequence.  I have no idea what causes the offset between LCs, but the RHM LC appears consistent with V magnitudes for this star in APASS and derived from Gaia rather than R magnitudes. 

I wish that we could have captured the complete egress but we were under 16 degrees altitude; the data had too much scatter to the point of occasional differential magnitude sign reversals between 11.349 R mag comp and 11.421 R mag check and the telescope was about to hit the hardwired stops. 

PJMO LCs below. Mag LC uploaded to AAVSO.

Brad Walter, WBY

RHM
measurements from Rochester, NY

I managed to measure a large portion of the eclipse from the RIT Observatory in Rochester, NY, though I missed both ingress and egress.  I used an "R" filter due to the large airmass -- the object was at sec(z) = 2.7 when I stopped observing around 12:30 AM.   You can find a description of the observations and reductions, together with a full dataset, at

http://spiff.rit.edu/richmond/ritobs/may06_2020/may06_2020.html

I've uploaded my measurements to the AAVSO website as well.   Note that I caught the eclipsing binary YY Cnc at the southern edge of my field, and it, too, was undergoing an eclipse last night.

Good luck to the project!

astrosberge
astrosberge's picture
Measurements from Casselman, Ontario

I was able to have a large portion of the transit but I did not have the ingress + egress... 

So a sequence of 120 images from 2020-05-07 01:23 UT to 2020-05-07 04:38 UT

 Do we have to submit the data to the AAVSO web obs ?

Serge

dennis-conti
dennis-conti's picture
Measurements

Hi Serge,

Do you have a light curve, even a partial one, that you can forward me?

Dennis

dennis-conti
dennis-conti's picture
Thanks to all

I want to thank all those who participated in this observation. My summary of results for those I have heard from so far are as follows:
   Brad Walter – captured eclipse approx. 40 minutes before midpoint to approx. 3 hours after

   Michael Richmond – captured eclipse approx. 1.5 hours before and 1.5 hours after midpoint

   Serge Bergeron – also was able to observe approx. 1.5 hours before and after midpoint; awaiting results

   Claudio Lopresti – unfortunately was only able to observe prior to ingress

   Emanuel Conseil – was able to observe only up to ingress.

So, because of the duration of the eclipse and time of midpoint, we were not able to get a full eclipse prior to and after egress, however, the observations of Brad, Michael and Serge should still be useful to the science team.  I’d like to  ask all three to continue communication with me directly via email at dennis@astrodennis.com so we can better discuss results. I will then report back to the Forum any preliminary results. I have heard via email from Brad, so if Michael and Serge could email me we can continue discussing the results and data format required to send to the PI.

Thanks again to all who participated.

Dennis Conti
Chair, AAVSO Exoplanet Section

Ed Wiley_WEY
Ed Wiley_WEY's picture
PI Data

I send Jerry an excel file of my results including both my AIJ fluxes and my VPhot magnitudes. He responded that what he needed was BJD(TDB) and flux (and I assume uncertainties). I will be sending my BVIc results to him today. I am also following up with some out-of-eclipse data if I get another clear night.

Ed

 

dennis-conti
dennis-conti's picture
PI Data

Hi Ed,

Thanks - can you forward me a copy of your results to dennis@astrodennis.com?

Thanks again.
Dennis

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