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TCP J18104219-1534184: new transient (12.1 mag) in Serpens

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SPK
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TCP J18104219-1534184: new transient (12.1 mag) in Serpens

TCP J18104219-1534184 (UG:)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=1540762

RA 18h10m42.19s, DE -15°34'18.4" (J2000.0)
2020 February 22.8389 UT, mag. 12.1 (CCD, unfiltered)
Discoverer: Hideo Nishimura (Kakegawa, Shizuoka-ken, Japan)
http://www.cbat.eps.harvard.edu/unconf/followups/J18104219-1534184.html

Dwarf nova outburst (with an amplitude of 8 magnitudes)?
Spectroscopy, precise astrometry, and multiband as well as time-resolved photometry are urgently required.

Clear skies,
Patrick

Ccolvin968
Ccolvin968's picture
On it!

Will be reporting in TR TG and TB. 

Working on transforms for my camera this week and having some minor issues. Hope to be fixed soon!

Definitely will be monitoring this one.

FRF
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T. Kojima prediscovery: 11.8, ASASN-SN this morning 13.86g

Updates:

2020 02 22.811

Mag.= 11.8 by T. Kojima, Tsumagoi, Gunma-ken, Japan, with Canon EOS 6D + 200-mm f/3.2 lens, pre-discovery image.

2020 02 23.3814

TCP J18104219-1534184 has been observed by ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) at 13.86g magnitude on 2020 Feb 23.3814 UT.
Light curve: https://asas-sn.osu.edu/light_curves/ef9a17f3-7feb-4cd0-a75a-0e319bf8b605

The ~2 magn difference between the ASAS-SN g photometry and the brighness reported by japanese observers suggests red color (or rapid fading) --> probably a galactic nova.

I tried to observe this TCP using various iTelescope facilities, but so far without success
- The area was not visible from Spain (iTelescope).
- New Mexico: "roof closed"
- Sierra Remote Observatory (California): "roof closed"

Robert

Deconinck Michel
Deconinck Michel's picture
Hi

Hi

I too tryed to observe this TCP this morning 23/2/2020 - 4h35 UTC but without success,

I used the AAVSO chart X25151JZ (with no faint comparison stars) but I was sure of the field, those maps are just perfect !

Using Tycho2 values my estimation was : fainter than +12.1

Michel

SPK
SPK's picture
Classification as a galactic classical (Fe II?) nova

E. Aydi, J. Strader, L. Chomiuk, A. Kawash, K. V. Sokolovsky (MSU), and T. W. S. Holoien (Carnegie):
"Classification of TCP J18104219-1534184 as a classical nova" (ATel #13517)
http://www.astronomerstelegram.org/?read=13517

Precise astrometry, multiband photometry, and further spectroscopy are urgently required.

Clear skies,
Patrick

Ccolvin968
Ccolvin968's picture
Even when observing with CCD

Even when observing with CCD/DLSR, I end up with only one check star in the FOV.

When measuring against 88 and adding another check star of 104 (HD 166321)...

I ended up with a result of about 12.741 mag at 0705 UTC on 23 Feb 2020.

SPK
SPK's picture
S. Kiyota's results

2020 02 23.8248 UT
Photometry results were V=13.18, Rc=11.50 and Ic=10.16 with 0.25m SCT + Apogee Alta F47 CCD at TAO, Kamagaya, Chiba, Japan. Position end figures were 42.51 and 18.41 in R.A. and Dec. http://meineko.sakura.ne.jp/ccd/TCP_J18104219-1534184.jpg
Seiichiro Kiyota (Kamagaya, Japan)

VAastro
TCP J18104219-1534184 Chart X25153B

TCP J18104219-1534184 Comparison stars now available in VSP chart X25153B

18.5 arcminute scale

AAVSO Sequence Team

Ccolvin968
Ccolvin968's picture
After new comp stars added...

After new comp stars added...

2020 Feb. 23.29300 // TG // 12.583 // err 0.020

2020 Feb. 23.29583 // TG // 12.614 // err 0.024

2020 Feb. 23.29925 // TG // 12.630 // err 0.028

2020 Feb. 23.30269 // TG // 12.660 // err 0.024

2020 Feb. 23.30616 // TG // 12.612 // err 0.018 

Additional time is planned tonight along with transforms once I get my B filters downloaded and solved.

 

TYS
TYS's picture
N 2020 Ser

Imaged this Nova this morning with the Slooh C2wf scope in Chile. N Ser is a very red star, not easy to estimate. Based on chart X25153QD I estimated its mag at 13.5 on a Tri-g image. mage was taken on 02/24/08/28/00 UTC.

FRF
FRF's picture
Fading? - Feb. 24.5184 UT 13.896V

2020 02 24.5184

Photometry results were V=13.896V, and Ic=10.841 with 0.25m iTelescope.net reflector + SBIG ST-10XME CCD at Mayhill, New Mexico, US. Position end figures were 42.29 and 18.5 in R.A. and Dec.

Robert

weo
weo's picture
Alert Notice 701: N Ser 2020 = TCP J18104219-1534184

AAVSO Alert Notice 701 reports on N Ser 2020 = TCP J18104219-1534184. Please see the notice for details and observing instructions.

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

Ccolvin968
Ccolvin968's picture
Just uploaded my second set

Just uploaded my second set of data in TG, TB, V, and B from last night. 

Nova is definitely dimming, Clouded out as of right now for tonight, but will follow up if possible in TG.

Getting far too faint in Blue for reliable transforms.

 

Clear skies to the rest of you!

FRF
FRF's picture
Astrometry

I've just made astrometry of 3 CCD images of Nova Sct made by Antal Kocsis (Hungary) using a Slooh telescope in Chile remotely:  the position end figures are 42.30 and 18.3 in R.A. and Dec, quite in agreement with the positions delivered  by Berto Monard and myself previously.

Robert

Ccolvin968
Ccolvin968's picture
Still observing this object.

Still observing this object.

Bad data received last night due to user error so no observations from me for the night of the 25th/morning of the 26th.

Trying again tonight.

SPK
SPK's picture
V670 Serpentis = Nova Serpentis 2020 = TCP J18104219-1534184

CBET 4726 (behind paywall):
http://www.cbat.eps.harvard.edu/iau/cbet/004700/CBET004726.txt

Regards,
Patrick

Ccolvin968
Ccolvin968's picture
Any chance of a summary of

Any chance of a summary of the data for those of us who don't have access?

Or instructions on how to pay to get access?

Thanks!

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