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Dátum: 2013-12-09 19:39:09
Feladó: FIDRICH Robert (Fidusz)
Tárgy: Uj, 13 magnis torpe nova az UMi-ban: MASTER OT J162323.48+782603.3
Sziasztok!

ATel #5643. számában tették közzé a hírt legújabb felfedezésükről
Deniszenkó és munkatársai:

MASTER OT J162323.48+782603.3

Az új, 13 magnitúdó fényességű törpenóva mindössze 31´-re van a 11,8
magnis NGC 6217 galaxistól, a dzéta UMi közelében.

A ma feldedezett törpe nóvának archív felvételek szerint tavaly januárban
és novemberben is volt egy-egy 13,3 magnitúdós kitörése, egyébként pedig
halványabb mint 18 magni.

Részletek:

http://www.astronomerstelegram.org/?read=5643

MASTER OT J162323.48+782603.3 - new bright CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 16h
23m 23.48s +78d 26m 03.3s on 2013-12-09.49575 UT. The OT unfiltered
magnitude is 13.2m (limit 16.4m). The OT is seen in 13 images. The object
has brightened to 13.0m by 2013-12-09.575 UT. We have reference image on
2011-10-07.51162 UT with OT at unfiltered magnitude 18.0 (limit 19.4m).

The object at quiescence is identical to the blue star USNO-A2.0
1650-01856527 (16 23 23.60 +78 26 02.1 R=18.3 B=18.2) = USNO-B1.0
1684-0061530 (16 23 23.378 +78 26 03.56 pmRA=-10 pmDE=24 B1=18.19 R1=18.20
B2=19.14 R2=18.91 I=18.30 ) = SDSS J162323.38+782603.6 (u=18.62 g=18.37
r=18.37 i=18.28 z=17.91). There is also an UV counterpart GALEX
J162323.3+782603 (FUV=19.63+/-0.09 NUV=19.20+/-0.05). Finally, there is a
faint X-ray source 2RXP J162322.7+782559 (0.00726 cnts/s) formally 5"
away. There is nothing at this position in GCVS and AAVSO VSX. This area
of sky in Ursa Minor is not covered by SDSS, CRTS and NEAT.

The object was included into the Atlas of Radio/X-ray associations
(Flesch, 2010) with a 93% probability of being a quasar, 1% - a galaxy and
1% - a star. However, the proper motion (-10, 24) mas/yr which is evident
between POSS-I and POSS-II plates taken in 1955 and 1995 respectively
shows the object to be a star in our Galaxy and definitely not a QSO.

The object was also detected in outbursts to 13.3m by MASTER-Amur on
2012-11-19.551 and 2012-01-07.928 UT. Based on the blue color and outburst
amplitude (~5m), MASTER OT J162323.48+782603.3 is most likely a dwarf nova
of SU UMa (UGSU) type in superoutburst. Follow up observations are
required. The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/162323.48782603.3.png

üdv:

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