Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

CBAT "Transient Object Followup Reports"

TCP J18035290-3127298

TCP J18035290-3127298   2025 09 21.381 *  18 03 52.90 -31 27 29.8  10.2 U             Sgr       9 1


2025 09 21.381

Transient object in Sagittarius. Discovered by John Seach, Grafton, NSW, Australia. Object visible on 3 images taken with DSLR with 40 mm f/1.4 lens. No object identified at position on 3 images taken with same instrument on September 20.380 UT, limiting magnitude 11.0. No minor planet at position. No object on DSS2-red. No variable star on VSX brighter than magnitude 12.7 within 1.3 arc minutes of the position. No variable object on ASAS-SN database. Note this is a crowded star field in the reference image with possible faint stars close to the position.



2025 09 21.449

Independent discovery has been reported (on Sept. 21.484 UT) from Kazuyoshi Kanatsu, Shimane, Japan. The object was mag about 10.6 on three images taken using f.l.135-mm lens and Pentax K30 digital camera with ISO 1600, 10 seconds exposure. Position end figures 52s.75, 24".7. ASAS-SN caught this object (mag about 11.2) on Sept. 21.096 UT. TCP J18035278-3127240 seems to be the same object. - Hitoshi Yamaoka (NAOJ)



2025 09 22.3757

Object has brightened to magnitude 8.5, unfiltered image with DSLR and 40 mm F/1.4 lens on September 22.3757 UT. John Seach, Grafton, NSW, Australia.



2025 09 22.4796

Position end figures 52s.75, 26.5" measured with 0.05m refractor + CMOS camera, Perth, Western Australia. J2000, Gaia DR2 positions. Transient position is within 0.7" of Gaia DR3 catalogue star 4043865232860503296 (19.8 G mag). Photometry - TB = 9.02, V = 8.78, TR = 8.43. Andrew Pearce, Nedlands, Western Australia



2025 09 22.5212

Follow-up photometry results were V =8.58, I =7.74. position end figures 52s.76, 26".7 using 0.43-m f/6.8 reflector + CMOS.(iTelescope.NET at Siding Spring Observatory) An image at URL http://orange.zero.jp/k-yoshimoto/TCP_J18035290-3127298_20250922.jpg. observed by K. Yoshimoto, Yamaguchi, Japan.



2025 09 22.6940

Follow-up photometry with the NMW wide-field survey camera (135mm f/2.0 telephoto lens + unfiltered ST-8300M CCD): 2025-09-22.6940 UTC CV=8.5. ---- Oxana Chernyshenko, Stanislav Korotkiy (Astroverty, Ka-Dar), Kirill Sokolovsky (UIUC) for the NMW team


Valid HTML 4.01!