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TCP J15472959-0532144: new transient (12.1 mag) in Libra

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SPK
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TCP J15472959-0532144: new transient (12.1 mag) in Libra

TCP J15472959-0532144 (UG:)

Discovery details:
R.A. 15h47m29.59s, Decl. -05°32'14.4" (J2000.0)
2018 Dec. 29.8217 UT, 12.1 mag (CCD, unfiltered)
Discoverer: Hideo Nishimura (Shizuoka-ken, Japan)

2018 12 29.822 UT
Discovered by H. Nishimura, Shizuoka-ken, Japan, on three frames with 30 second exposure using Canon EOS 6D digital camera + 200-mm f/3.2 lens under the limiting mag = 15, who writes nothing is visible at this location on a frame taken on 2018 Dec. 20.867 UT with limit mag.= 13 and there is a star (mag = 18.5) at this location. Also S. Kaneko, Shizuoka-ken, reports no star was visible on two frames (limit mag = 14.4) taken 2018 Dec. 28.843 UT.

2018 12 30.12 UT
A progenitor candidate from Gaia DR2 is 5" away at R.A. 15h47m29.838s, Decl. -05°32'18.10" (equinox J2000.0, epoch 2015.5; Gmag. 17.44, parallax 2.0059 ± 0.1161 mas, distance ~0.49 kpc). Other designations are CSS_J154729.8-053218 (Vmag. range 16.8-17.3), USNO-A2.0 0825-08927905 (Bmag. 18.5, Rmag. 17.2), USNO-B1.0 0844-0276155, GSC2.3 S89H006806 (Fmag. 17.60), PSO J154729.843-053218.154 (gmag. 18.83, rmag. 17.82), 2MASS J15472984-0532182, GALEX J154729.8-053218 (nuv_mag. 21.9), etc. No previous outbursts were detected by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) at the transient's position between 2012 March 17 and 2018 September 22; complete light curve at
https://asas-sn.osu.edu/light_curves/2308153f-5f15-4fdc-a525-dababb4df431
--- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

http://www.cbat.eps.harvard.edu/unconf/followups/J15472959-0532144.html

*** Precise astrometry, spectroscopy, and multiband (and time-resolved) photometry are urgently required. ***

Clear skies,
Patrick

FRF
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~13.4V

TCP J15472959-0532144 is clearly visible on my 2x45s V images made  remotely using an 0.61m itelescope.net reflector at Sierra Remote Observatory, Auberry, California, USA. Preliminary photometry resulted ~13.4V brightness on 30.5799UT December 2018.
 

File upload: 
FRF
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~13.1 Ic

Ic-band photometry based on my 2x45s I images made remotely using an 0.61m itelescope.net reflector at Sierra Remote Observatory, Auberry, California, USA on 30.5824UT December 2018 around ~13.1 Ic brightness.

Deconinck Michel
Deconinck Michel's picture
I just had the opportunity to

I just had the opportunity to look visually to this object.

At 5:30 UTC 31/12/2018 my estimate magnitude was between 13.5 and 13.6 

Michel

vkagnihotri
vkagnihotri's picture
Multiband Photometric Observations (TCP J15472959-0532144)

Hello

Good morning

Adding Multiband Photometric data TCP J15472959-0532144.

TCP J15472959-0532144

Astrometry: Catalog UCAC4, J2000

RA= 15h47m29.84s DEC= -05°32'17.94''

UT 30.988 R MAGNITUDE= 13.61 ±0.10 

UT 30.991 I MAGNITUDE= 13.71 ±0.10

UT 30.993 V MAGNITUDE= 13.51 ±0.09

UT 30.998 B MAGNITUDE= 13.63 ±0.23

telescope details: 0.28m Schmidt–Cassegrain+CCD +Bessell BVRI+PRiSMv10

Imaged: K. Vora, India

Measured: V.K.Agnihotri, India

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