[vsnet-alert 22067] Re: PNV J18040967-1803581: possible nova (11.2 mag) in Sagittarius

Mon Apr 9 13:46:14 JST 2018

Photometry results by Vikrant Kumar Agnihotri, Rawatbhata, India:
2018 04 08.9274 UT
11.74V (0.04), 13.63B (0.04).

Fidrich Robert (Budapest, Hungary)


2018-04-08 22:41 keltezéssel, Patrick Schmeer pasc1312-aavso at yahoo.de 
via vsnet-alert írta:
> PNV J18040967-1803581 (N:)
> 
> RA 18h04m09.67s, DEC -18°03'58.1" (J2000.0)
> 2018 April 8.7229 UT, 11.2 mag (CCD, unfiltered)
> Independent discoverers: Tadashi Kojima (Gunma-ken, Japan)
> and Hideo Nishimura (Shizuoka-ken, Japan)
> 
> 2018 04 08.723 UT
> Discovered by T. Kojima, Gunma-ken and H. Nishimura, Shizuoka-ken,
> independently. Kojima found this star on six frames with five
> second exposure using Canon EOS 6D digital camera + 200-mm f/3.2
> lens under the limiting mag = 12.5, who writes nothing is visible
> at this location on a frames (limit mag = 13.2) taken 2018 March
> 27.767 UT. Nishimura also found this star (mag.= 11.2) on five
> frames taken on 2018 April 8.728 UT with ten second exposure using
> Canon EOS 6D digital camera + 200-mm f/3.2 under the limiting
> mag.= 14.3, who writes nothing is visible on a frame taken on
> Apr. 7.723 UT (limit mag.= 14) and gives the position at end
> figures 09s.46, 57".3.
> 
> 2018 04 08.728 UT
> Both images at
> http://www.oaa.gr.jp/~oaacs/image/PNVSgr2018K.JPG
> http://www.oaa.gr.jp/~oaacs/image/PNVSgr2018N.JPG
> 
> 2018 04 08.82 UT
> The nearest USNO-B1.0 star is 4" away: USNO-B1.0 0719-0746451 at
> RA 18h04m09.67s, DEC -18°03'54.4" (J2000.0, R= 18.16 mag,
> B= 21.42 mag; G= 18.31 mag in Gaia DR1; r= 19.11, g= 20.95 mag
> in Pan-STARRS DR1). No previous outbursts or eruptions were
> recorded at the transient's position by the ASAS-SN Sky Patrol
> (Shappee et al. 2014ApJ...788...48S and Kochanek et al.
> 2017PASP..129j4502K) since 2015 February; the latest available
> observation is 2018 March 29.605 UT, fainter than mag 16.1 V:
> https://asas-sn.osu.edu/light_curves/bec38ad2-4de7-4d4c-8439-4d1230931d53
> --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)
> 
> Follow-up reports:
> http://www.cbat.eps.harvard.edu/unconf/followups/J18040967-1803581.html
> 
> Spectroscopy, multiband photometry, and precise astrometry are
> urgently required.
> 
> Clear skies,
> Patrick
> 
>