IAU Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

CBAT "Transient Object Followup Reports"

TCP J23191702+4831142

TCP J23191702+4831142   2012 10 12.5811*  23 19 17.02 +48 31 14.2  16.3 U             And       9 0

2012 10 12.581

P. Balanutsa, D. Denisenko, P. Podvorotny, E. Gorbovskoy, V. Lipunov, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov (Moscow State University, SAI), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov, A. Punanova (Ural Federal University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov (Blagoveshchensk Educational University), V. Shumkov, S. Shurpakov, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA) report: MASTER OT J231917.03+483114.2 – new CV? MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 23h 19m 17.03s +48d 31m 14.2s on 2012-10-12.58108 UT. The OT unfiltered magnitude is 16.3m (limit 18.3m). The OT is seen in 2 images. We have reference image without OT on 2011-12-26.41296 UT with magnitude limit in 'V' filter 18.1m. There is a blue star at the position of the OT on POSS-II plates. It was faint (mag ~21) on 1989 July 12 blue plate, but in outburst on 1989 Aug. 28. It is present in GSC 2.3.2 with coordinates 23 19 17.068 +48 31 14.16 and Jmag=16.95. Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J231917+483114-BRIR.jpg (10'x10' FOV) with comparison of 1989-07-12 and 1989-08-28 blue images at http://master.sai.msu.ru/static/OT/J231917+483114-anim-DDS-B.gif (200"x200" crop). The star has an ultraviolet counterpart GALEX J231917.0+483115 (NUV=21.61+/-0.32). It is absent in USNO-B1.0, 2MASS, 1RXS and GCVS catalogs, as well as in AAVSO VSX. This area of sky is not covered by SDSS, CSS and NEAT. Based on the blue color, amplitude of variability and presense of a previous outburst we conclude that MASTER OT J231917.03+483114.2 is a new cataclysmic variable (dwarf nova). Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/231917.03483114.2.png

2012 10 18.1243

Negative detection. Object not seen in sum of 20 x 120-sec images, limiting magnitude approx 20.0 . Observer: R. A. Koff, Antelope Hills Observatory, Bennett, Colorado USA (H09). Image posted at: http://antelopehillsobservatory.org/SNpictures/TCPJ23191702+4831142final.jpg

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