[vsnet-alert 21860] Re: PNV J17244011-2421463: new transient (12.5 mag) in Ophiuchus

[Hiroyuki Maehara]

 This object is listed as an H-alpha emission-line star (2MASS J17243996-2421474
= KW 011 519-33) in Kohoutek, L. and Wehmeyer, R., AN 324, 437 (2003).

 According to the ASAS-SN light curve (Shappee et al. 2014, Kochanek et
al. 2017), the brightening of this object started in 2017 Sep.
https://asas-sn.osu.edu/light_curves/bd9f4922-8561-4b5c-a04c-fab2c03dfa94


> -----Original Message-----
> From: vsnet-alert [mailto:vsnet-alert-bounces at ooruri.kusastro.kyoto-u.ac.jp] On Behalf Of Patrick Schmeer
> pasc1312-aavso at yahoo.de via vsnet-alert
> Sent: Tuesday, February 13, 2018 5:35 PM
> To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp; vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp;
> cvnet-outburst at yahoogroups.com; baavss-alert at yahoogroups.com
> Subject: [vsnet-alert 21859] PNV J17244011-2421463: new transient (12.5 mag) in Ophiuchus
> 
> PNV J17244011-2421463
> https://www.aavso.org/vsx/index.php?view=detail.top&oid=608210
> 
> RA 17h24m40.11s, DEC -24°21'46.3" (J2000.0)
> 2018 Feb. 12.8339 UT, 12.5 mag (CCD, unfiltered)
> Discoverer: Tadashi Kojima (Gunma-ken, Japan)
> 
> "2018 02 12.834 UT
> Discovered by T. Kojima, Gunma-ken, Japan, on three frames
> with five second exposure using Canon EOS 6D digital camera
> + 200-mm f/3.2 lens under the limiting mag = 13.5, who writes
> nothing is visible at this location on the previous frame
> (limit mag = 12.0) taken 2018 Feb. 8.844 UT and also a frame
> on 2017 Apr. 27 UT. There is a star (mag= 15.6) at the
> position of 39s.95 and 47".0.
> 
> Follow-up reports:
> http://www.cbat.eps.harvard.edu/unconf/followups/J17244011-2421463.html
> (see also my comments there)
> 
> Spectroscopy and precise astrometry are urgently required.
> 
> Clear skies,
> Patrick