Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J18154219+3515598

TCP J18154219+3515598   2017 06 04.31  *  18 15 42.19 +35 15 59.8  11.8 U                       9 0

2017 06 05.953

Visual magnitude estimate of this transient in Lyra by Patrick Schmeer, Saarbrücken-Bischmisheim, Germany: 2017 June 5.953 UT, 11.6 (203-mm Schmidt-Cassegrain telescope).

2017 06 05.93

The UV source GALEX J181542.2+351559 (FUV= 20.69, NUV= 19.88 mag) is only 0.7" from the reported position of the transient. This UV source is probably identical with a Gaia DR1 source (G= 19.148 mag) with position end figures 42.199s, 59.34" and with the blue star USNO-B1.0 1252-0273704 (42.249s, 59.96"; B1= 18.26, R1= 19.52, B2= 19.12, R2= 19.14, I= 18.64 mag).--- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2017 06 06.86028

Observation of this transient object was made on 2017 06 06.86028 by Andrea Mantero at Bernezzo Observatory (MPC C77) Cuneo, Italy, with a telescope 0.25 m. f/4 + V filter. Performed photometry returns a value of 12.479 +/- 0.008 V magnitude (reference v mags from AAVSO sequence).Astrometry RA= 18 15 42.18 De= +35 15 59.4 position measured from reference stars UCAC-4 catalogue.

2017 06 07.881

P. Berardi (ARAS), L'Aquila, Italy, obtained a low-resolution spectrum of this transient on 2017 Jun 7, 21:08 UT. Observation was performed at Bellavista Observatory (MPC code C93), using 0.23 m SCT telescope and Lhires III spectrograph configured for low resolving power (4200-7400A, 10A res.). The blue continuum and absorption of H-beta, H-gamma lines (h-alpha emission component fills the photospheric absorption) give evidence of the dwarf nova nature. U Sollecchia (ARAS), L'Aquila, Italy, obtained a comparable spectrum observing the target on 21 UT with a 0.20 m SCT telescope and Alpy 600 spectrograph. Spectral profile is available here: http://quasar.teoth.it/html/spectra/tcpj18154219+3515598_PB.png