[vsnet-alert 21558] Re: TCP J05074264+2447555: new transient (10.8 mag) in Taurus

[Hiroyuki Maehara]

The recent KWS data suggest that the V-Ic color index of the object is ~1.0 on Oct 31.723.

http://kws.cetus-net.org/~maehara/VSdata.py?object=050743%2B2447.9&resolver=&plot=1&obs_ys=2017&obs_ms=01&obs_ds=01&obs_ye=&obs_me=&obs_de=&submit=Send+query

object               date(UT)       mag.     code  err.
TCPJ05074264+2447555 20171026.75975 12.269V  KW2   0.136
TCPJ05074264+2447555 20171026.78350 12.223V  KW2   0.130
TCPJ05074264+2447555 20171026.78353 10.667Ic KW2   0.113
TCPJ05074264+2447555 20171026.78384 12.126V  KW2   0.121
TCPJ05074264+2447555 20171026.78388 10.767Ic KW2   0.126
TCPJ05074264+2447555 20171030.72359 11.585V  KW2   0.074
TCPJ05074264+2447555 20171030.72362 10.459Ic KW2   0.094
TCPJ05074264+2447555 20171030.72394 11.607V  KW2   0.075
TCPJ05074264+2447555 20171030.72398 10.320Ic KW2   0.083
TCPJ05074264+2447555 20171030.74630 11.603V  KW2   0.075
TCPJ05074264+2447555 20171030.74634 10.343Ic KW2   0.085
TCPJ05074264+2447555 20171030.74664 11.585V  KW2   0.074
TCPJ05074264+2447555 20171030.74668 10.380Ic KW2   0.087
TCPJ05074264+2447555 20171031.72300 11.449V  KW2   0.067
TCPJ05074264+2447555 20171031.72304 10.437Ic KW2   0.088
TCPJ05074264+2447555 20171031.72333 11.411V  KW2   0.065
TCPJ05074264+2447555 20171031.72337 10.366Ic KW2   0.082
TCPJ05074264+2447555 20171031.74568 10.316Ic KW2   0.076
TCPJ05074264+2447555 20171031.74602 10.094Ic KW2   0.063

KW2:
 f.l.=105mm lens + SBIG ST-8XME (V-band)
 f.l.=105mm lens + SBIG STT-1603ME (Ic-band)

On Tue, Oct 31, 2017 at 21:56:03, Patrick Schmeer pasc1312-aavso at yahoo.de via vsnet-alert wrote:
> TCP J05074264+2447555  (CV:)
> 
> RA 05h07m42.64s, DEC +24°47'55.5" (J2000.0)
> 
> 2017 Sept. 2.762 UT, 13.0 mag
> 2017 Oct. 25.688 UT, 11.7 mag
> 2017 Oct. 31.734 UT, 10.8 mag
> (all CCD, unfiltered)
> 
> Discoverer: Tadashi Kojima, Gunma-ken, Japan
> 
> 2017 10 31.734 UT
> Discovered by T. Kojima, Gunma-ken, Japan, who found
> this on three frames taken using Canon EOS 6D + 135-mm
> f3.2 lens with the limiting mag.= 13.0. Star is visible
> on 2017 Sept. 2.762 (mag.= 13.0) and on Oct. 25.688
> (mag.= 11.7) UT. Also this star is cataloged on USNO-A2
> as mag.= B14.7 and R13.6. An image at
> http://www.oaa.gr.jp/~oaacs/image/TCPinTau2017.jpg
> 
> Follow up-reports:
> http://www.cbat.eps.harvard.edu/unconf/followups/J05074264+2447555.html
> 
> Spectroscopy and time-resolved photometry are urgently
> required.
> 
> Clear skies,
> Patrick
>