[vsnet-alert 23112] TCP J05515391+6504346: likely dwarf nova outburst (13.2 mag) in Camelopardalis

Tue Apr 2 03:34:28 JST 2019

TCP J05515391+6504346 (UG:)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=686919

Discovery details:
R.A. 05h51m53.91s, Decl. +65°04'34.6" (J2000.0)
2019 Apr. 1.4504 UT, 13.2 mag (CCD, unfiltered)
Discoverer: Hideo Nishimura (Shizuoka-ken, Japan)

2019 04 01.450 UT
Discovered by H. Nishimura, Shizuoka-ken, Japan, on
three frames with 15 second exposure using Canon EOS 6D
digital camera + 200-mm f/3.2 lens under the limiting 
mag = 14.7, who writes there is no previous image since
this is not his survey area and also because of a faint
star, he has confirmed the appearance of this star on
April 1.593 UT.

2019 04 01.65 UT
A (blue) progenitor candidate is 2.3" away at Gaia DR2
position end figures 53.825s, 36.80" (equinox J2000.0,
epoch 2015.5; Gmag. 20.62). Other designations are
USNO-B1.0 1550-0122180 (Bmag. 20.9, Rmag. 20.2),
GSC2.3 NAQ5009716 (Fmag. 20.08, Bjmag. 21.52),
PSO J055153.857+650436.965 (gmag. 20.59, rmag. 20.63),
and CSS_J055153.8+650436. No outbursts were recorded
by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...
788...48S and Kochanek et al. 2017PASP..129j4502K)
between 2012 Jan. 11 and 2019 Mar. 30; complete light
curve at
https://asas-sn.osu.edu/light_curves/acb806ec-ce61-4bcf-8e9e-6e1a54a2e73d

The transient is probably a dwarf nova outburst with
an amplitude of about 7 magnitudes (WZ Sge type?).

*** Spectroscopy as well as multiband and time-resolved
photometry are strongly recommended. ***

--- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

http://www.cbat.eps.harvard.edu/unconf/followups/J05515391+6504346.html

Clear skies,
Patrick