Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PNV J17224490-4137160

PNV J17224490-4137160   2023 04 20.6780*  17 22 44.90 -41 37 16.0   8.0 U             Sco       3 0

2023 04 20.678

Discovered by Andrew Pearce, Nedlands, Western Australia, who found this star on three images (limit mag.= 12.5) taken with Canon 800D digital camera + 85-mm f/1.2 lens, writes nothing is visible at the discovery position on three images taken on 2023 April 19.690 UT or April 18.693 UT with the same instrument. Star was visually confirmed on April 20.705 UT at magnitude 8.0. Position is approximate.

2023 04 20.724

Position end figures 45s.04, 16".5 measured with 0.35m R-COP reflector + CCD at Perth Observatory, W. Australia. J2000, Gaia DR2 positions. Position appears to correspond to a 19th magnitude star (Gaia DR3 5959616875349110656). Photometry using R-COP as follows: April 20.724 UT V = 7.60 and B = 8.50

2023 04 20.855

Further photometry using 0.35m R-COP reflector + CCD at Perth Observatory, W. Australia as follows: April 20.756 UT V = 7.53 and B = 8.51, April 20.818 UT V = 7.40 and B = 8.35, April 20.855 UT V = 7.32 and B = 8.22 Visual magnitude estimates: April 20.722 UT 7.9, April 20.760 UT 7.6 and April 20.860 UT 7.6. Andrew Pearce, Nedlands, Western Australia.

2023 04 20.80069

Observed by Hideo Nishimura, Kakegawa, Shizuoka, Japan (mag 9.9, 10-s exp.) on three frames (limiting mag 13, position end figures 45s.08, 16".8) taken by Canon EOS 6D digital camera + 200-mm F/3.0 lens. --- Seiichiro Naito and Isao Endoh (NAOJ)

2023 04 21.54

we performed some follow-up of this object through a TEL 0.1-m f/3.56 astrograph + CMOS located in Yass, North South Wales in Australia and operated by Telescope Live network (MPC code Q56). On images taken on April 21.5, 2023 we can confirm the presence of an optical counterpart with R-filtered CCD magnitude +7.8 (R-filtered images were saturated in 30-second exposures) at coordinates: R.A. = 17 22 45.01, Decl.= -41 37 15.6 (equinox 2000.0; Gaia DR2 catalogue reference stars for the astrometry). Our confirmation image: https://tinyurl.com/novasco23 - An animation showing a comparison between our image and an archive POSS plate: https://tinyurl.com/novascoanimation - With kind regards Ernesto Guido, Luca Izzo, Adriano Valvasori

2023 04 21.6809

Additional photometry using 5-second exposures with the same setup 0.1-m f/3.56 astrograph + CMOS operated by Telescope Live network (Australia, MPC code Q56) are as follows: April 21.6809 UT V = 7.3 and April 21.6814 UT R = 7.1 - E. Guido, L. Izzo, A. Valvasori