Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J16001844-2230106

TCP J16001844-2230106   2026 05 09.6135*  16 00 18.44 -22 30 10.6  13.3 U             Sco       9 9

2026 05 09.6135

Discovered by Tadashi Kojima, Tsumagoi,Gunma-ken, Japan, on three frames(4_s exp) under limiting mag.= 14.3 taken by Canon EOS 6D digital camera + 300mm f/2.8 lens. mag=14.5: on 2026 Apr 13.694UT with same instrument.

2026 05 10.5472

Follow-up photometry results were B =14.48, V =13.68, I =12.55. position end figures 18s.41, 12".0 using 0.3-m f/4 reflector + CMOS. Same position as Gaia EDR3 6243217104889830912 G mag=14.92, This object to be a brightening of [PBB2002] USco J160018.4-223011. An image at URL http://orange.zero.jp/k-yoshimoto/TCP_J16001844-2230106_20260510.jpg. observed by K. Yoshimoto, Yamaguchi, Japan (P87).

2026 05 10.44915

Brightening of a young stellar object listed as Orion Variable in Simbad. Unfiltered V-zeropoint photometry with the NMW-TexasTech wide-field cameras (two identical 135mm telephoto lenses + QHY600M CMOS): 2026-04-23.40329 2461153.90329 13.78 0.08 Camera-1 2026-04-23.40461 2461153.90461 13.66 0.07 Camera-1 2026-04-23.43406 2461153.93406 13.72 0.08 Camera-2 2026-04-23.43459 2461153.93459 14.15 0.12 Camera-2 2026-04-25.30435 2461155.80435 13.94 0.13 Camera-2 2026-04-25.30485 2461155.80485 13.85 0.13 Camera-2 2026-04-28.43940 2461158.93940 14.01 0.18 Camera-1 2026-04-28.44013 2461158.94013 13.86 0.15 Camera-1 2026-04-28.45484 2461158.95484 14.35 0.24 Camera-2 2026-04-28.45541 2461158.95541 14.13 0.18 Camera-2 2026-05-07.41429 2461167.91429 14.07 0.17 Camera-2 2026-05-07.41485 2461167.91485 13.76 0.12 Camera-2 2026-05-07.44240 2461167.94240 13.84 0.16 Camera-1 2026-05-07.44320 2461167.94320 13.77 0.14 Camera-1 2026-05-08.30569 2461168.80569 13.24 0.06 Camera-2 2026-05-08.30833 2461168.80833 13.34 0.06 Camera-2 2026-05-08.36201 2461168.86201 13.40 0.08 Camera-1 2026-05-08.36267 2461168.86267 13.41 0.08 Camera-1 2026-05-09.31329 2461169.81329 13.08 0.05 Camera-2 2026-05-09.31387 2461169.81387 13.13 0.05 Camera-2 2026-05-09.36978 2461169.86978 13.43 0.07 Camera-1 2026-05-09.37043 2461169.87043 13.43 0.07 Camera-1 2026-05-10.44831 2461170.94831 13.67 0.12 Camera-1 2026-05-10.44915 2461170.94915 13.57 0.12 Camera-1 ----- Kirill Sokolovsky, Katie Barnhart, Darien Perla, Vallia Antoniou, Elias Aydi (Texas Tech University)

2026 05 10.5274

Follow-up photometry observations: 13.5G, 14.2B, SeestarS50 tri-color G, B-channels, using UCAC-4 star catalogs. And also, 10.6384UT; 13.4G, 14.1B. T.Yusa, Osaki, Japan.