Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J17395720-2627410

TCP J17395720-2627410   2024 03 10.7754*  17 39 57.20 -26 27 41.0  11.5 U             Oph       9 0

2024 03 06.775

Discovered by Tadashi Kojima, Tsumagoi,Gunma-ken, Japan, on three frames(5_s exp) under limiting mag.= 12.8 taken by Canon EOS 6D digital camera + 200mm f/3.2 lens. Nothing is visible at this location taken on 2024 Mar06.807UT under limiting mag.=13.2 . mag=11.3 on 2024 Mar 10.784UT with same instrument.

2024 03 10.80701

Independent discovery by Minoru Yamamoto, Okazaki, Aichi, Japan, on three frames (mag=11.1, limiting mag 15.0, end figures 57.28s, 41.2") using Canon EOS 6D digital camera + 180-mm lens. Nothing is visible at this location on the frames taken on 2024 Mar. 09.81 UT (limiting mag 15) by same instrument. --- Isao Endoh (NAOJ)

2024 03 10.82479

Independent discovery by Shigehisa Fujikawa, Kan'onji, Kagawa, Japan, mag=10.4, end figures 56.97s, 39.6" using digital camera + 120-mm lens. On 2024 Mar. 10.85195 UT, mag=10.9, end figures 57.11s, 42.0" using digital camera + 400-mm lens. --- Isao Endoh (NAOJ)

2024 03 10.7966

Independent discovery by Yuji Nakamura, Kameyama, Mie, Japan, on two frames (6-s exp. mag=11.1, limiting mag 13.0, end figures 57.20s, 43.1") using 135-mm lens and CMOS camera. Nothing is visible at this location on the frames taken on 2024 Feb. 27.8159 UT (6-s exp. limiting mag 13.0) by same instrument. --- Isao Endoh (NAOJ)

2024 03 10.7722

Independent discovery by Andrew Pearce, Nedlands, Western Australia using Canon 800D camera and 85mm f/1.2 lens. Visible on 3 images. Mar 10.772 UT magnitude 11.3 (unfiltered). Not visible on images taken on Mar 8.772 or Mar 9.771 UT to a limiting magnitude of 12.0. Same object as TCP J17395699-2627413.

2024 03 11.1068

Photometry with the 2nd NMW wide-field camera (135mm f/2.0 telephoto lens + unfiltered SBIG STL-11000 CCD): 2024-03-11.1068 CV=10.28 +/-0.05 ---- Stanislav Korotkiy (Astroverty, Ka-Dar), Kirill Sokolovsky (UIUC, SAI MSU), Sergei Ostapenko, Vladimir Belousov, Nikolay Potapov

2024 03 11.296

Photometry results were B=11.75, V=10.34, I=7.82. position end figures 57s.08, 42".0 using 0.51-m f/6.8 corrected Dall-Kirkham + CMOS; remotely Deep Sky Chile. An image at http://orange.zero.jp/k-yoshimoto/TCP_J17395720-2627410_20240311.jpg observed by K. Yoshimoto, Yamaguchi, Japan,

2024 03 11.3201

Position end figures 57s.08, 41".7 measured with 0.35m f/7.2 reflector + CCD at Rio Hurtado Valley, Chile (T73). J2000, Gaia DR2 positions. Magnitude 11.2 (unfiltered). Position is 0.85" away from a Gaia 18.9 G magnitude star (Gaia DR3 4061829569164264576). Andrew Pearce, Nedlands, Western Australia.

2024 03 11.6850

Photometry using with 0.50m f/6.8 reflector + CCD at Siding Spring, NSW, Australia (T30) as follows: Mar 11.685 UT B = 12.89, V = 11.15. Correction to unfiltered magnitude estimate reported on Mar 11.320 UT from 11.2 to 10.2. Andrew Pearce, Nedlands, Western Australia.

2024 03 11.39502

The position measured from the 4.1m SOAR telescope g-band acquisition image relative to the surrounding Gaia DR3 stars, 17:39:57.080 -26:27:41.93 +/-0.1 J2000, is consistent within 0.2" with the measurements reported earlier by A. Pearce, K. Yoshimoto, and K. Itagaki. There is no catalogued Gaia DR3 source matching the nova position within the uncertainties. Photometry derived from the same image: 2024-03-11.39502 g=11.26 +/-0.01. The plate-solved FITS image is available at http://scan.sai.msu.ru/~kirx/img/TCPJ17395720-2627410/ ---- Kirill Sokolovsky (UIUC), Isabella Molina, Ryan Urquhart, Elias Aydi, Laura Chomiuk, Jay Strader (MSU)