[vsnet-alert 18166] MASTER OT J150302.53-674306.4 - CV with a slow rising outburst

[Denis Denisenko]

MASTER-SAAO robotic telescope recently installed in South African
Astronomical Observatory (see http://master.sai.msu.ru/masternet/ and
http://www.saao.ac.za/spod/first-light-with-master-saao/ for more
details and images) has started discovering new objects in the
southern hemisphere. The 2nd CV found by MASTER-SAAO has shown
unusually slow rise to the outburst (at least 4 days), as shown by the
table below:

MASTER OT J150302.53-674306.4
  20150101.051  174C  MASTER-SAAO
  20150103.043  173C  MASTER-SAAO
  20150104.045  159C  MASTER-SAAO
  20150105.047  154C  MASTER-SAAO
  20150106.060  153C  MASTER-SAAO
  20150107.055  148C  MASTER-SAAO
  20150107.063  149C  MASTER-SAAO

This object in Circinus was found by Oleg Gress from Irkutsk on Jan.
7th and published in ATel #6884,
http://www.astronomerstelegram.org/?read=6884
MASTER-SAAO discovery and reference images together with the
preliminary light curve are available at
http://master.sai.msu.ru/static/OT/MASTERJ150302.53-674306.4.png

Color-combined DSS finder chart:
http://master.sai.msu.ru/static/OT/J150302-674306-VRIR5x5.jpg

The object was in bright outburst on two 1987-05-24 Quick-V plates,
not so bright on 1991-07-17 Red plate and at quiescence on remaining 9
DSS plates.

Coordinates and magnitudes from various catalogs:
USNO-B1.0 0222-0658690 15 03 02.48 -67 43 06.2 B2=18.03 R2=17.05 I=16.54
USNO-B1.0 0222-0658692 15 03 02.59 -67 43 07.2 R1=15.71 B2=17.55
R2=17.01 I=16.56
GSC 2.3.2: 15 03 02.37 -67 43 06.2 Fmag=17.09 jmag=16.41 Vmag=15.34 Nmag=17.42
2MASS J15030243-6743062 J=16.08+/-0.13 H=15.33+/-0.11 K=15.17+/-0.17

Judging by the light curve, the object may be similar to RU Peg.
Follow up observations are encouraged.

Denis Denisenko
Member of MASTER team at SAI MSU