Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J17234205-3103072

TCP J17234205-3103072   2020 09 08.4229*  17 23 42.05 -31 03 07.2  12.5 U             Sco       9 0

2020 09 08.423

Discovered by Tadashi Kojima, Tsumagoi,Gunma-ken, Japan, on three frames under limiting mag.= 13.5 taken by Canon EOS 6D + 300mm f/3.2 lens. Nothing is visible at this location taken on 2020 Aug18.450 UT under limiting mag.= 14.0 taken by Canon EOS 6D + 300mm f/3.2 lens. Mag=12.7 on 2020 Sep08.4213UT same camera.

2020 09 08.63

Crowded field. The closest star found via Vizier is Gaia DR2 4058144727782811648 with position end figures 41.933s in RA and 07.75" in DE (equinox J2000.0, epoch J2015.5, Gmag. 16.26), which is 1.6" WSW of the reported position of the transient (and also included in several other catalogues). No (obvious) brightenings were observed by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) since 2016 Mar. 10; the latest observation is 2020 Sept. 4.874 UT, fainter than gmag. 15.6; complete light curve and data at https://asas-sn.osu.edu/light_curves/3ecc3966-aaa9-4a84-a5da-ec0abae2bff2 —— Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2020 09 09.406

RMag.= 11.4, position end figures 41s.93, 08".2 observed by T. Noguchi, Chiba-ken, Japan, using 0.23-m f/6.3 Schmidt Cassegrain + unfiltered CCD(KAF-0261E), An image at http://park8.wakwak.com/~ngc/images/TCPinSco_20200909.jpg.

2020 09 08.8703

The abovementioned red star (Gaia DR2 4058144727782811648) is also the closest VizieR source to the position reported by Noguchi-san (the Gaia source is 0.5" to the north). The most recent ASAS-SN Sky Patrol observations are 2020 September 4.874 UT, fainter than gmag. 15.6; 8.870 UT, gmag. 14.20; recent light curve and data at https://asas-sn.osu.edu/light_curves/65052cbb-497a-4857-ae38-6041519bd6d6 —— Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2020 09 11.4491

Photometry results were B=17.87, V=14.39, Rc=12.19 and Ic=10.87 with 0.43-m f/6.8 CDK astrograph + FLI PL4710 CCD (T17, iTelescope.NET) at SSO, NSW, Australia. Position end figures were 41.92 and 07.5 in R.A. and Dec., respectively. I also took a low-resolution spectrum with the same telescope. This object was highly reddened and it was very weak at wavelengths shorter than H alpha. I might be detected broad H alpha emission, but it was uncertain. More Spectra will be needed to confirm its nature. My spectrum image is available at http://meineko.sakura.ne.jp/Spe/TCP_J17234205-3103072-spe-200911.jpg. Seiichiro Kiyota (Kamagaya, Japan)

2020 09 11.378

Vmag. 14.40, Imag. 11.19, position end figures 41.93s, 07.6" (RA, DE J2000.0) observed by Andrew Pearce, Redlands, W. Australia, using 0.50-m f/6.8 reflector (T31, iTelescope.Net) at Siding Spring Observatory (SSO; near Coonabarabran, NSW, Australia) —— Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2020 09 11.378

Corrigendum: "Redlands" should read "Nedlands". Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)