Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

CBAT "Transient Object Followup Reports"

PNV J17244011-2421463

PNV J17244011-2421463   2018 02 12.8339*  17 24 40.11 -24 21 46.3  12.5 U             Oph       5 0



2018 02 12.834

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.




2018 02 13.32

The star mentioned by Kojima-san is USNO-A2.0 0600-26778250 (R= 15.6, B= 17.4 mag). It is identical with GSC2.3 S8D5032733 (V= 16.2, F= 15.3, N= 13.1 mag) and an H-alpha emission star. In 2017 October a brightening at the transient's position was recorded by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K): 2017 Sept. 23.055 UT, V~15.7 mag; Oct. 1.002, 15.2; 2.034, 15.1; 7.019, 14.6; 9.024, 14.7; 13.007, 14.1; 14.007, 14.3; 16.010, 14.4 - https://asas-sn.osu.edu/light_curves/df8ce49c-ee38-4f3f-99eb-27b540040291 --- Patrick Schmeer (Saarbr├╝cken-Bischmisheim, Germany)




2018 02 13.5140

Photometry results were B=14.13, V=13.01 and Ic=10.83 with 0.25-m f/3.4 astrograph + SBIG ST-10XME CCD camera (T-05, iTelescope.NET at Mayhill, NM, USA) http://meineko.sakura.ne.jp/ccd/PNV_J17244011-2421463.jpg Seiichiro Kiyota (Kamagaya, Japan)




2018 02 13.521

Mag. B= 14.05, V= 12.87, I= 10.87, position end figures 39s.93, 47".4 observed by K. Yoshimoto, Yamaguchi-ken, Japan, using 0.25-m f/3.4 reflector at Mayhill, remotely. An I-band image at http://orange.zero.jp/k-yoshimoto/PNV-J17244011-2421463_20180213.jpg.



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