Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J17562787-1714548

TCP J17562787-1714548   2023 02 19.8234*  17 56 27.87 -17 14 54.8   9.6 U             Sgr       9 0

2023 02 19.823

Discovered by Yukio Sakurai, Mito, Ibaraki-ken, Japan, who found this star on three frames with 10-s exposure (limit mag.= 12.1) using Nikon D7100+180-mm f/2.8 lens, who writes nothing is visible at this location on three frames (limit mag.= 12.8) taken on 2023 Feb. 17.816 UT with same instrument.

2023 02 19.8044

H. Nishimura, Kakegawa, Shizuoka, Japan, reports his discovery of this object (mag 10.8) on the image taken on 2023 Feb. 19.8044 UT with Canon EOS6D + 200mmf/3 lens (limiting mag about 14.0). He reports the position end figures as 27s.89, 53".2. No object was found on his image taken on 2023 Feb. 17.8492 UT (limiting mag about 15.0). His report reached to NAOJ on Feb. 19.921 UT. (H. Yamaoka, NAOJ)

2023 02 19.8044

Nishimura-san's image: https://y2.nao.ac.jp/index.php/s/7od8X3zY2PKEA5w (H. Yamaoka)

2023 02 19.833

Independent discovery by Andrew Pearce, Nedlands, Western Australia using Canon 800D camera and 85mm f/1.2 lens. Visible on 3 images. Feb 19.833 UT magnitude 10.5 (unfiltered). Not visible on images taken on Feb 16.839 UT to a limiting magnitude of 11.5. Visible on image taken Feb 19.834 UT at approximate magnitude 11.0.

2023 02 18.834

Correction to the above positive observation on Feb 19.834 UT. That should be Feb 18.834 UT. Andrew Pearce, Nedlands, Western Australia.

2023 02 20.126

Position end figures 27s.90, 53".7 measured with 0.50m f/6.8 reflector + CCD at Skygems Observatory, Namibia. J2000, Gaia DR2 positions. Feb 20.126 UT magnitude 10.5 (unfiltered). Andrew Pearce, Nedlands, Western Australia.

2023 02 20.364

Photometry using T72 0.5m f/6.8 reflector + CCD at Rio Hurtado Valley, Chile as follows: Feb 20.364 UT V = 11.39, Feb 20.364 UT B = 12.07. Andrew Pearce, Nedlands, Western Australia.

2023 02 20.3575

Photometry results were B=11.71, V=11.18, Rc=9.80 and Ic=9.26 with T72, iTelescope.NET (0.34m F6.8 CDK) + FLI ML-16200 CCD at Deep Sky Chile at Rio Hurtado Valley, Chile. Seiichiro Kiyota (Kamagaya, Japan)

2023 02 20.827

Mag.= 10.95, position end figures 27s.91, 53".5 observed by T. Noguchi, Katori, Japan, using 0.23-m f/10 Schmidt-Cassegrain + unfiltered CCD (KAF-0261E), An image at http://park8.wakwak.com/~ngc/images/TCPinSgr_20230220.jpg

2023 02 21.5833

Observer: Filipp Romanov (AAVSO, Russia). Remotely using iTelescope.Net T11 (0.50-m f/6.8 reflector + CCD + f/4.5 focal reducer) in Utah Desert Remote Observatory, USA. 2023 Feb. 21.52255 11.884 V +/- 0.002; 2023 Feb. 21.52360 12.648 B +/- 0.005; 2023 Feb. 21.52459 10.551 Rc +/- 0.001; 2023 Feb. 21.52660 11.879 V +/- 0.001; 2023 Feb. 21.52767 12.625 B +/- 0.003; 2023 Feb. 21.52866 10.543 R +/- 0.001. Color image (3x60 sec. with V, B, Rc filters): https://www.flickr.com/photos/filipp-romanov/52702897703/

2023 02 21.6132

Correction in Rc magnitudes: 2023 Feb. 21.52459 10.715 Rc +/- 0.004 and 2023 Feb. 21.52866 10.718 Rc +/- 0.003. My Ic magnitudes: 2023 Feb. 21.52557 10.322 Ic +/- 0.009 and 2023 Feb. 21.52963 10.315 Ic +/- 0.006 (Filipp Romanov).