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Central Bureau for Astronomical Telegrams -- Image credits

CBAT "Transient Object Followup Reports"

TCP J16540110-2515100

TCP J16540110-2515100   2018 05 10.6793*  16 54 01.10 -25 15 10.0  11.7 U             Oph       9 0

2018 05 10.679

Discovered by Y. Sakurai, Ibaraki-ken, Japan, on two frames with 15-s exposure using Nikon D7100 + digital camera + 180-mm f/2.8 lens under the limiting mag = 13.6, who writes that nothing is visible at this location on two frames taken on 2018 May 4.679 UT.

2018 05 10.81

This transient is identical with the Mira variable ASASSN-V J165400.90-251511.4 (period 234 d; Gaia DR2 position end figures 00.92s, 11.3"): https://asas-sn.osu.edu/database/light_curves/60579. --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)