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TCP J06373299-0935420: new transient (10.4 mag) in Monoceros

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SPK
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TCP J06373299-0935420: new transient (10.4 mag) in Monoceros

TCP J06373299-0935420 (UG:)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=684300

Discovery details:
R.A. 06h37m32.99s, Decl. -09°35'42.0" (J2000.0)
2019 Feb. 21.4516 UT, 10.4 mag (CCD, unfiltered)
Discoverer: Shizuo Kaneko (Kakegawa, Shizuoka-ken, Japan)

2019 02 21.452 UT
Discovered by S. Kaneko, Kakegawa, Shizuoka-ken, Japan, with on 10-s exposure on eight frames using Canon 6D digital camera + 200-mm f/2.8 lens under the limiting mag = 14.5, who writes that nothing is visible at this location on a frame taken on 2019 Feb. 20.447 UT with limit mag.= 14.7.

2019 02 21.65 UT
A (blue) progenitor candidate from Gaia DR2 is 0.3" away at R.A. 06h37m33.004s, Decl. -09°35'42.15" (equinox J2000.0, epoch 2015.5; Gmag. 19.21, parallax 2.7192 ± 0.4374 mas, distance ~0.38 kpc). Other designations are USNO-A2.0 0750-02439919 (Bmag. 18.6, Rmag. 18.9), USNO-B1.0 0804-0087491, GSC2.3 S3BJ014199 (Fmag. 18.9, Bjmag. 19.4), WISE J063733.02-093541.9, PSO J063733.002-093542.127 (gmag. 19.47, rmag. 19.32). Observations by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) of the current brightening: 2019 Feb. 13.291 UT, gmag. fainter than 16.45; 21.156, gmag. 12.56; no previous eruptions or outbursts were recorded since 2012 Jan. 29; complete light curve at https://asas-sn.osu.edu/light_curves/aef18120-7c35-4b28-9a31-2e083608bf8f
--- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

http://www.cbat.eps.harvard.edu/unconf/followups/J06373299-0935420.html

*** Multiband and time-resolved photometry, spectroscopy, and precise astrometry are urgently required. ***

Clear skies,
Patrick

msheald
New Transient Comps?

Glad to help!

   Do we have comps for the field? Best regards.

Mike

SPK
SPK's picture
TCP J06373299-0935420 = ASASSN-19de

2019 02 21.78 UT

Meanwhile the All-Sky Automated Survey for Supernovae reported (on "Thu Feb 21 12:48:54 EST") this transient as ASASSN-19de: "RA 06:37:32.98, Dec -09:35:42.4, discovery 2019-02-21.15 UT, gmag. 12.16; bright CV candidate, matches to PS1 g=19.5, g>17.3 on 2019-02-13.29, g=12.6 on 2019-02-21.16."

http://www.astronomy.ohio-state.edu/~assassin/transients.html

Regards,
Patrick

SPK
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Now in VSX
CTX
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Sequence Now Avaiable

Sequence Now Available

Deconinck Michel
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Thanks, I observed this

Thanks, I observed this transient tonight, brillant and easy to observe. I post the estimations tomorrow. 

Michel

graemecoates
graemecoates's picture
Also have observed

Taken a time resolved series this evening and uploaded to AID. Possibly some variation between Vmag 10.3 and 10.4 over ~70min. 

Deconinck Michel
Deconinck Michel's picture
I made two estimations via

I made two estimations via Tycho magnitudes but there are quite were different, it looks like the magnitude change in 15 minutes from +/- 0.2 ???  My visual estimation was +10.4.

The stars given in the new sequence are too faint.

An interesting star indeed !

Michel 

CTX
CTX's picture
Added Brighter Comps

Added Brighter Comps... should have done this yesterday... I apologize

 

 

Deconinck Michel
Deconinck Michel's picture
Thank you Timothy, much

Thank you Timothy, much appreciated

Tonight visualy between 10.4 and 10.5 using your new sequence.

Michel

Robin Leadbeater
TCP J06373299-0935420 spectrum

A low resolution R~500 spectrum taken at 20190221.814 shows a blue continuum
with no H alpha line and H beta and higher Balmer lines in weak absorption.
The spectrum can be viewed in the BAA spectroscopy database here
https://britastro.org/specdb/data_graph.php?obs_id=3925

Robin

hboussier
TCP J06373299-0935420 spectrum

An other low resolution R~550 spectrum taken at 20190222.855 U.T from K21, South of france.

 

http://www.astrosurf.com/astrild/TCP_j06373299-0935420_20190222_855_HBO.jpg

 

Hubert Boussier

SPK
SPK's picture
Probably a WZ Sge-type dwarf nova (at supermaximum)

Photometry and spectroscopy indicate that TCP J06373299-0935420 is a UGWZ superoutburst.

Deconinck Michel
Deconinck Michel's picture
I wonder

Hello

Just as a question, I'm not specialised in spectroscopy but is it sure that this is a nova and not a SN ? There is a good galactical candidate in the neigbour, look at the photo taken by a friend (LLJA) and the references here join ?

Also, the curve decreasing is not a classical nova one, isn't it ?

Michel

File upload: 
msheald
How Long should I Monitor TCP J06373299-0935420?

Hello! I am happy to monitor TCP J06373299-0935420. How long is data typically useful after an outburst of this type? Thank you and best regards.

Mike

hambsch
hambsch's picture
Coverage

Hi Mike,

in principle as long as you can observe the star. You need to adjust exposure times as the stars get dimmer. Superhumps may pop up at a larger amplitude only later in the outburst. Also there might be rebrightenings etc.

So I normally follow new targets as long as I can.

Josch

msheald
Thank you! Mike

Thank you!

Mike

msheald
? Significant Drop in Brightness of TCP J06373299 over 24 Hours

Hello! My images from last night show a significant decrease in magnitude of TCP J06373299-0935420 of about 2 magnitudes from a day ago. I had windy conditions, and the magnitude is nearing the limits of my equipment, giving my measurements an error range about 0.2 mags in B,V, and I last night.

    Tonight, I will have better conditions, and I'll be able to use longer integration times to get a better error range. Best regards.

Mike

Deconinck Michel
Deconinck Michel's picture
I confirm

I confirm

A friend of mine (LLJA) did this CCD estimation yesterday evening:

13.03.2019 - 20h30 UTC

     Filter Baader red magnitude 14.224

     Filter Baader bleue magnitude 14.875

For my 250mm it's off.  Maybe a hub in a while ...

Michel

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