MisV1446: Outburst of an X-ray Source
2012 Feb. 3
Seiichi Yoshida / MISAO Project
On January 9, 2012, we the MISAO Project discovered a new dwarf nova,
outburst of an X-ray source, from the survey images taken by
Youichirou Nakashima.
Variation of MisV1446 (Image: Youichirou Nakashima)
Field of view: about 8 arcmin.
This dwarf nova was discovered by Seiichi Yoshida (MISAO Project) in the
MISAO Project nova survey. It was picked up as one of the nova
candidates from Youichirou Nakashima (Okayama, Japan)'s unfiltered CCD
images on 2012 Jan. 5 by the PIXY System 2. It locates at R.A.
07h41m12s.70, Decl. -09o45'55".9 (equinox J2000.0) and the brightness
was 14.1 mag.
This object was not found on the past images of the MISAO Project from
Jan. 15 to Dec. 24 in 2011 by Nakashima with a limiting magnitude of
14.6-15.6 mag.
Yoshida confirmed that it is not a known asteroid using the Minor Planet
Checker. Yoshida also confirmed that it is not an infrared object using
the 2MASS images.
The SIMBAD database shows an X-ray source 1RXS J074112.2-094529 exists
near by this position. So it seemed to be an outburst of this X-ray
source.
Immediately, Diego Rodriguez confirmed the outburst of this
object. It was 14.65-14.66 mag on Jan. 8.919 and 8.923 on his
unfiltered CCD images with LX200 25cm f/6.3 and ST8XME. Then we the
MISAO Project assigned a new variable star designation MisV1446 to
this star.
We have discovered another dwarf nova MisV1443 just one year ago, on 2011
Jan. 10
(see MisV1443: Discovery of Bright Dwarf Nova in Orion).
Hidetaka Sato observed multi-band photometry on Jan. 9, and confirmed
that this star is bluish. Here is the report published at the CBAT
Transient Objects Confirmation Page (TOCP).
2012 01 09.0644
V-band mag = 14.74 +/- 0.04. R-band mag = 14.55 +/- 0.01, I-Band mag = 14.36 +/- 0.01 by Hidetaka Sato, Ota-ku, Tokyo, Japan. Position end figures 12s.72, 56".2 (USNO-A2.0), remotely using 0.43-m f/4.5 reflector + CCD (EV2 CCD47-10-1-109) at iTelescope Astrocamp Observatory, Nerpio, Spain (MPC-I89). Magnitudes were measured on each two images of 60 seconds (V) or 30 seconds (R and I) of exposure under 17.5 V, 18.0 R, 17.5 I of the limiting magnitude at 1.5 of airmass. The position was derived from two co-added images of R-band exposure. The standard stars were taken on Landolt SA98-666, 670, 671 and 685 at 1.5 of airmass.
Luca Buzzi Federica Luppi observed this object on Jan. 10. Here is the
report published at the CBAT Transient Objects Confirmation Page
(TOCP).
2012 01 10.965
This transient was observed by Luca Buzzi and Federica Luppi from Schiaparelli Observatory, Varese, Italy. In a single unfiltered 30 seconds image, it has position end figures 12s.71, 56".0 and magnitude 14.8. A star is visible in DSS red and blue images at position end figures 12s.71, 56".2 and magnitude 17.4 R. Image posted at URL: http://www.astrogeo.va.it/pub/TOCP/TCP_J07411270-0945559.jpg
Taichi Kato, Kyoto University, commented that GSC 2.3.2 has a 19.1(Bj)
mag counterpart. The object looks like a dwarf nova with a relatively
large outburst amplitude.
Taichi Kato and Tomohito Ohshima, VSNET, reported that observations
between Jan. 11 and 15 by Seiichiro Kiyota, Kiyoshi Kasai, William
Stein, Berto Monard, and Enrique de Miguel detected superhumps with a
period of 0.07786 (7) days, confirming the SU UMa-type nature of this
object. The amplitude of the superhumps was 0.2 mag, but became
temporalily very small (~0.05 mag) on Jan. 14. Further observations
by Berto Monard, William Stein, Josch Hambsch, Greg Bolt, Kiyoshi
Kasai and Tomohito Ohshima et al. at Kyoto University, showed this
dwarf nova started the rapid decline on Jan 15. Since the length for
which this object was at the plateau stage was 5 days, the true start
of outburst seems to have been a little earlier.
Diego Rodriguez reported that the dwarf nova faded down to 17.13
mag(CR), 17.50 mag(CV), on Jan. 17.93.
(Supplement on June 23, 2013)
Taichi Kato, Kyoto University, et al., published the paper.
PASJ: Publ. Astron. Soc. Japan , 1-?? (Feb. 23, 2013)
Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. IV: The Fourth Year (2011--2012)
T. Kato, et al.
(Updated on Nov. 8, 2018)
2018 Nov. 3.76650 14.8 cG Yutaka Maeda
2018 Nov. 2.86822 14.5 cG Yutaka Maeda
2018 Oct. 28.84671 13.8 cG Yutaka Maeda
2018 Oct. 27.82492 13.5 c Yutaka Maeda
2018 Oct. 26.80243 13.9 cG Yutaka Maeda
2018 Oct. 26.1465 13.93 V Eddy Muyllaert
2018 Oct. 25.818 13.7 visual Hiroyuki Maehara
2018 Oct. 24.75166 14.0 cG Yutaka Maeda
2018 Oct. 23.74742 13.9 c Yutaka Maeda
2018 Oct. 21.7457 [13.8 c Yutaka Maeda
2018 Oct. 20.7570 [16.1 c Yutaka Maeda
2018 Oct. 8.76455 [14.6 c Yutaka Maeda
2017 Mar. 23.296 [17.12 V ASAS-SN
2017 Mar. 20.300 14.69 V ASAS-SN
2017 Mar. 16.3 [16.71 V ASAS-SN
2017 Mar. 14.1 [15.93 V ASAS-SN
2014 Apr. 5.898 [18.2 C Eddy Muyllaert
2014 Mar. 1.994 [17.8 C Eddy Muyllaert
2014 Feb. 8.038 [17.5 C Eddy Muyllaert
2012 Mar. 21.56306 [15.3 C Youichirou Nakashima
2012 Mar. 21.56170 [15.2 C Youichirou Nakashima
2012 Mar. 21.56035 [14.9 C Youichirou Nakashima
2012 Feb. 19.59005 [15.6 C Youichirou Nakashima
2012 Feb. 19.58868 [15.8 C Youichirou Nakashima
2012 Feb. 19.58733 [15.8 C Youichirou Nakashima
2012 Feb. 12.59933 [14.1 C Youichirou Nakashima
2012 Feb. 12.59796 [14.2 C Youichirou Nakashima
2012 Feb. 12.59661 [14.5 C Youichirou Nakashima
2012 Feb. 2.65692 [15.5 C Youichirou Nakashima
2012 Feb. 2.65559 [15.3 C Youichirou Nakashima
2012 Feb. 2.65425 [15.5 C Youichirou Nakashima
2012 Jan. 30.64270 [15.6 C Youichirou Nakashima
2012 Jan. 30.64137 [15.6 C Youichirou Nakashima
2012 Jan. 30.64002 [15.5 C Youichirou Nakashima
2012 Jan. 17.932 17.50 CV Diego Rodriguez
2012 Jan. 17.930 17.13 CR Diego Rodriguez
2012 Jan. 17.59763 [15.7 C Youichirou Nakashima
2012 Jan. 17.59628 [15.3 C Youichirou Nakashima
2012 Jan. 17.59495 [15.6 C Youichirou Nakashima
2012 Jan. 8.923 14.65 CV Diego Rodriguez
2012 Jan. 8.919 14.66 CV Diego Rodriguez
2012 Jan. 5.62720 14.1 C Youichirou Nakashima
2012 Jan. 5.62586 14.1 C Youichirou Nakashima
2012 Jan. 5.62451 14.3 C Youichirou Nakashima
2011 Dec. 24.80741 [14.4 C Youichirou Nakashima
2011 Dec. 24.80606 [14.5 C Youichirou Nakashima
2011 Dec. 24.80472 [14.5 C Youichirou Nakashima
2011 Dec. 24.80339 [14.6 C Youichirou Nakashima
2011 Nov. 20.77806 [15.5 C Youichirou Nakashima
2011 Nov. 20.77671 [15.6 C Youichirou Nakashima
2011 Nov. 20.77538 [15.6 C Youichirou Nakashima
2011 Mar. 23.54037 [15.6 C Youichirou Nakashima
2011 Mar. 23.53903 [15.3 C Youichirou Nakashima
2011 Mar. 23.53770 [15.3 C Youichirou Nakashima
2011 Jan. 15.77907 [15.3 C Youichirou Nakashima
2011 Jan. 15.77771 [15.3 C Youichirou Nakashima
2011 Jan. 15.77634 [15.6 C Youichirou Nakashima
| 
