Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

CBAT "Transient Object Followup Reports"

TCP J08371988-0602457

TCP J08371988-0602457   2018 10 20.7821*  08 37 19.88 -06 02 45.7  13.0 U             Hya       8 0

2018 10 20.782

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 = 14.1, who writes nothing is visible at this location on a frame taken on 2017 Nov. 28 UT with limit mag.= 13.5.

2018 10 20.7682

Independently discovered by Shigehisa Fujikawa, Kan'onji, Kagawa, Japan, on a frame taken on 2018 Oct 20.7682 using a Minolta 120-mm-f.l. f/3.5 camera lens. His position end figures are 20s.13, 41".0 and his estimation of the magnitude is 12.3.

2018 10 21.13

A possible progenitor is CSS_J083720.2-060242, magnitude range from Catalina Real-time Transient Survey (CRTS) data about 19.3–21.0. Gaia DR2 position end figures are 20.23s, 43.7" (J2000.0, Ep. 2000.0); proper motion pmRA= -17.8, pmDE= +10.8 mas/yr. Other designations are USNO-B1.0 0839-0186052, GSC2.3 S3LG001777, PSO J083720.218-060243.557. No outbursts were recorded by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) since 2012 Feb. 11; latest available observation is 2018 Oct. 17.592 UT, Vmag. 16.5 (contaminated by nearby stars); complete light curve at https://asas-sn.osu.edu/light_curves/e4b49b7b-6fc1-4eb1-a89d-88a43b35a83e --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2018 10 21.8

Kazuya Ayani, Bisei Astronomical Observatory, Ibara, Okayama, Japan, obtained a low-resolution spectrogram (range 400-800 nm; resolution 0.5 nm at H-alpha)of this TCP with the 1.01-m telescope of Bisei Astronomical Observatory on Oct. 21.8 UT. It shows absorption lines of H-beta, H-gamma, H-delta, He I (447.1 nm) on a blue continuum. H-alpha line is not discernible probably because the absorption is filled with the emission. These imply that it may be a dwarf nova. The spectrum can be viewed via website URL http://www.bao.city.ibara.okayama.jp/astro/2018/tcp/TCP_J08371988-0602457_Oct21.jpg .

2018 10 22.762

Mag. B= 13.11, V= 13.20, I= 13.17, position end figures 20s.20, 43".5 observed by K. Yoshimoto, Yamaguchi-ken, Japan, using 0.50-m f/6.8 reflector + CCD + f/4.5 focal reducer, Siding Spring, remotely. An image at ttp://orange.zero.jp/k-yoshimoto/TCP-J08371988-0602457_20181022.jpg.

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