According to the data posted at VSNET the precise position is RA = 11h12m17.4s, Dec = -35o38m29s which corresponds to the 20.88 mag star GSC2.3 S55U020591.
| 2007.12.17 | 2007.12.19 |
|
|
b
Light curve (click to enlarge):
| HJD | Date UT | Time UT | UT-decimal | magnitude |
| 2454451.71 | 2007-12-17 | 05:03 | - | >12.0 |
| 2454451.79 | 2007-12-17 | 07:02 | - | >13.8 |
| 2454452.791 | 2007-12-18 | 07:00:57 | - | 11.50 |
| 2454453.726 | 2007-12-19 | 05:25:51 | - | 11.70 |
| 2454453.731 | 2007-12-19 | 05:33:31 | - | 11.68 |
| 2454453.734 | 2007-12-19 | 05:37:41 | - | 11.56 |
| 2454453.737 | 2007-12-19 | 05:41:52 | - | 11.62 |
| 2454453.793 | 2007-12-19 | 07:02:47 | - | 11.57 |
New data posted at VSNET strongly suggest that the object is a WZ Sge-type dwarf nova:
2007.12.24 Arne Henden wrote:
We also obtained images on 071223 from SRO, with astrometry
11:12:17.40 -35:38:28.8 (J2000)
UCAC2 reductions, errors less than 0.1arcsec; essentially identical
to Suzuki-san's measurements.
The rough photometry is
V B-V V-Rc R-I V-Ic
12.91 -0.03 0.06 0.03 0.08
So no evidence of any Halpha emission. With an 8-magnitude outburst
amplitude and the high galactic latitude, I'd consider this to be
a cataclysmic binary, probably WZ Sge subclass.
2007.12.28 Daiskau Nogami wrote:
Kenzo Kinugasa obtained three optical spectra (~4000-8000A)
of this star around Dec. 25.83 (UT) at Gunma Astronomical
Observatory with a 1.5-m telescope and a low resolution
spectrograph. The combined spectrum is a typical one of
dwarf novae in outburst, showing a very blue continuum
having singly peaked Halpha and He I emission lines, an
emission core superposed on the shallow Hbeta absorption
line, He II 4686 and CIV 5802/5812 in emission. This
spectrum and the photometric results reported by H. Maehara
(vsnet-alert 9775/9778) indicate that OT J1112 is a WZ Sge-
type dwarf nova, having an intermediate inclination,
caught during the very early phase of a superoutburst.