Electronic Telegram No. 4207
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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Prepared using the Tamkin Foundation Computer Network


PROBABLE NEW DWARF NOVA IN ORION = TCP J05002724+1334199
     H. Yamaoka, Kyushu University, forwarded to the Central Bureau a report
sent by H. Maehara, Okayama Astrophysical Observatory, National Astronomical
Observatory of Japan, of the discovery of a variable star (mag about 12.3) by
Shizuo Kaneko (Kakegawa, Shizuoka, Japan) on a CCD image taken on Nov. 28.557
UT with a Canon 5D Mark II camera (+ 200-mm-f.l. lens).  The variable star is
located at R.A. = 5h00m27s.24, Decl. = +13d34'19".9 (equinox J2000.0).  The
variable was designated TCP J05002724+1334199 when it was posted at the
Central Bureau's TOCP webpage.  Additional CCD magnitudes for TCP
J05002724+1334199, unfiltered unless noted otherwise:  Oct. 14.664, [15.6
(Kaneko); Nov. 4.378, 15.6 (T. Noguchi, Katori, Chiba-ken, Japan; 0.23-m
f/6.3 Schmidt-Cassegrain reflector; position end figures 27s.22, 19".7;
communicated by S. Nakano, Sumoto, Japan); 4.668, [15.8 (Kaneko); 20.651,
[15.5 (Kaneko); 27.629, [14.7 (Kaneko); 28.749, 12.2 (Kaneko); 28.752, 12.4
(Kaneko); 28.980, V = 12.5 (Kaneko; remotely with an iTelescope 0.32-m f/8
reflector + SBIG STXL-6303E camera at Nerpio, Spain; 28.982, R = 12.8 (Kaneko;
with Nerpio telescope); 28.984, B = 12.0 (Kaneko; with Nerpio telescope);
29.638, V = 12.8 (Kaneko; remotely with an iTelescope 0.32-m f/9 reflector +
SBIG ST-8XME camera at Siding Spring, Australia); 29.642, R = 13.4 (Kaneko;
with Siding Spring telescope); 29.644, B = 12.6 (Kaneko; with Siding Spring
telescope); 30.303, B = 12.42, V = 13.49 (S. Kiyota, Kamagaya, Japan; remotely
with an iTelescope 0.43-m f/4.5 CDK astrograph + FLI-PL6303E camera near
Mayhill, NM, USA; position end figures 27s.25, 20".3; image posted at URL
http://meineko.sakura.ne.jp/ccd/TCP_J05002724+1334199.jpg); 30.327, B =
13.7, V = 13.4, R =13.6 (T. Yusa, Osaki, Japan; remotely using a 0.50-m
f/6.8 astrograph + FLI ProLine PL11002M camera at the RAS Observatory near
Mayhill, NM, U.S.A.; position end figures 27s.25, 20".0; reference stars
from UCAC4 catalogue; limiting mag 16.0; image posted at website URL
http://space.geocities.jp/yusastar77/supernova/PNinOri_151130.htm);
30.472, 13.8 (Noguchi; position end figures 27s.24, 20".3; image posted at
URL http://park8.wakwak.com/~ngc/images/TCPinOri.jpg; communicated by
Nakano).
     Noguchi adds that there is a star of mag 15.6) at position end figures
27s.22, 19".7 a red Digitized Sky Survey image taken in 1989.  Maehara adds
that TCP J05002724+1334199 can be identified with catalogued objects in the
USNO-B1.0 catalogue (at red mag about 16.0) and the 2MASS catalogue (at J
magnitude 14.3), as well as with SDSS J050027.24+133419.9, GALEX
J050027.2+133420, 1RXS J050027.7+133415, and 1SXPS J050027.1+133418.
     Maehara also forwards a report from Mitsugu Fujii (Okayama, Japan), who
obtained a low-resolution spectrogram (range 400-750 nm; R = 600 at H-alpha)
of TCP J05002724+1334199 on Nov. 30.573 UT with a 0.4-m telescope at the
Fujii Kurosaki Observatory in Okayama, Japan.  The spectrum shows a blue
continuum with an H-alpha emission line.  The equivalent width of the H-alpha
emission is -1.5 nm.  These features suggest that the variable is likely a
dwarf nova in outburst.  The spectrum has been posted at the following
website URL:  http://otobs.org/FBO/etc/tcp_ori.htm.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2015 CBAT
2015 December 2                  (CBET 4207)              Daniel W. E. Green