[vsnet-alert 14060] Re: OT J105122.8+​672528 = Catalina transient

[Denis Denisenko]

Congratulations to CRTS team on discovering this outburst! This
variable was found by Kirill Sokolovsky and myself from USNO-B1.0
magnitudes (R2=18.96, I=15.16) back in April 2011 when we were doing
the extended search for the CVs in the 30" circles around faint ROSAT
sources. It is 25.5" away from 1RXS coordinates with the nominal error
radius of 12". Then it has somehow escaped the publication in my
article "New CVs from USNO-B1.0: Stars with Outbursts on IR Palomar
Plates" (arxiv:1108.5122). Checking my notes now I see I was looking
at this variable again on Sep. 1st. It was in outburst on 1999 Dec. 12
infrared DSS plate and in quiescence on 17 other Palomar plates. Also
worth of note is the blue color in both USNO catalogs:

USNO-B1.0 1574-0152350
10 51 22.897 +67 25 28.51 pmRA=-14 pmDE=-8 B1=17.56 R1=18.72 B2=19.02
R2=18.96 I=15.16

USNO-A2.0 1500-05362482 10 51 23.03 +67 25 28.5 R=18.5 B=17.6

And finally, the star was bright in UV with two entries in GALEX
catalogue (observed on 2004 Jan. 21):

GALEX J105122.7+672528
FUV=16.89+/-0.04 NUV=16.34+/-0.02

GALEX J105122.7+672528
FUV=16.90+/-0.05 NUV=16.39+/-0.02

Denis Denisenko