Central Bureau for Astronomical Telegrams
CBAT "Transient Object Followup Reports"
TCP J18200437-1033071
TCP J18200437-1033071 2019 04 08.7083* 18 20 04.37 -10 33 07.1 13.3 U Ser 9 0
2019 04 08.708
Discovered by H. Nishimura, Shizuoka-ken, Japan, on three frames using Canon EOS 6D Digital camera + 200-mm f/3.2 lens under the limiting mag = 14.7, who writes nothing is visible at this location on two frames taken on 2019 Apr. 5.724 and 6.720 UT with the limit mag.= 14s and there is a star (mag = 15.5) on USNO-A2.0 catalog.
2019 04 08.118
Recent observations by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) confirm this transient: 2019 Apr. 7.076 UT, gmag. fainter than 16.33; 8.118, 13.77; 8.574, 13.45; no previous eruptions or outbursts were recorded since 2012 Apr. 22/2015 Feb. 1; complete light curve at https://asas-sn.osu.edu/light_curves/0c86c2b5-5786-44dc-ad89-c619169e2422. Galactic latitude +2.1°. Galactic nova? --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)
2019 04 08.88
Nishimura-san wrote: "There is a star (mag = 15.5) on USNO-A2.0 catalog." This star is USNO-A2.0 0750-12956864 (Bmag. 15.7, Rmag. 15.3; epoch 1951.577) with position end figures 04.28s, 07.8" (J2000.0); it is not included in other catalogues (or several magnitudes fainter and at a somewhat different position). A previous brightening of this object in 1951 July? --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)
2019 04 09.3530
TCP J18200437-1033071 was clearly visible at 13.5V brightness on a 60s CCD V image taken by Robert Fidrich, Budapest, Hungary on 9.3530 April 2019, using a 0.25cm iTelescope.net reflector remotely at Mayhill, New Mexico, USA.
2019 04 09.3814
Photometry results were B=13.93, V=13.54 and Ic=14.44 with 0.25-m f/3.4 astrograph + SBIG ST-10XME CCD at iTelescope.NET(Mayhill, NM, USA), Position end figures were 04.23 and 08.6 in R.A. and Dec. http://meineko.sakura.ne.jp/ccd/TCP_J18200437-1033071.jpg Seiichiro Kiyota(Kamagaya, Japan)
2019 04 09.3530
Position end figures were 04.21 and 08.7 RA and D respectively. Astrometry based on a 60s V and 2x45s I-band images taken by Robert Fidrich, Budapest, Hungary on 9.3530 April 2019, using a 0.25cm iTelescope.net reflector remotely at Mayhill, NM. https://www.dropbox.com/s/ixw8alscd5084oy/tcp1820-10_190409t5v1tx_crop.jpg?dl=0
2019 04 09.3530
Position end figures were 04.21 and 08.7 RA and D respectively. Astrometry based on a 60s V and 2x45s I-band images taken by Robert Fidrich, Budapest, Hungary on 9.3530 April 2019, using a 0.25cm iTelescope.net reflector remotely at Mayhill, NM. https://www.dropbox.com/s/ixw8alscd5084oy/tcp1820-10_190409t5v1tx_crop.jpg?dl=0
2019 04 09.47
Vizer shows only a ~22.76g mag (~21.8r mag) sources within 0.06 arcsec of the positions provided by recent astrometry: VPHAS DR2 J182004.2-103308.7 (PNSTARRS 95332750174837530). This suggest an object with at least 8 magnitude amplitude. (Robert Fidrich, Budapest, Hungary)
2018 0404 09.47
A progenitor candidate is PSO J182004.207-103308.550 (at RA 18 20 04.207, DE -10 33 08.66, J2000.0; gmag. 21.9, rmag. 22.1) = VPHASDR2 J182004.2-103308.7; USNO-A2.0 0750-12956864 (Bmag. 15.7, Rmag. 15.3; epoch 1951.577 – see above) is 1" away and may have been a previous outburst in 1951 July. --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)
2019 04 09.47
(Date of follow-up report corrected) --- A progenitor candidate is PSO J182004.207-103308.550 (at RA 18 20 04.207, DE -10 33 08.66, J2000.0; gmag. 21.9, rmag. 22.1) = VPHASDR2 J182004.2-103308.7; USNO-A2.0 0750-12956864 (Bmag. 15.7, Rmag. 15.3; epoch 1951.577 – see above) is 1" away and may have been a previous outburst in 1951 July. --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)
2019 04 09.3814
Correction of my last follow up report. Ic=13.24m not 14.44. Seiichiro Kiyota
2019 04 09.3556
I-band photometry: 12.90Ic on 9.3556 April 2019 based on 2x45s CCD images taken by Robert Fidrich, Budapest, Hungary using a 0.25cm iTelescope.net reflector remotely at Mayhill, NM, US.
