Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PNV J10251200-5331109

PNV J10251200-5331109   2025 06 25.440 *  10 25 12.00 -53 31 10.9   5.7 U             Vel       9 9

2025 06 25.440

Possible new nova in Vela. Discovered by John Seach, Grafton, NSW, Australia. DSLR with 50 mm f/1.2 lens. Object visible on 3 images. No object identified at position on 3 images taken with same instrument on May 24.506 UT, limiting magnitude 10.8. No minor planet or variable star at position. No object on DSS2-red.

2025 06 25.541

Independent discovery by Andrew Pearce (Nedlands, Western Australia). Images taken with Canon 800D camera + 85mm f/1.2 lens. Approximate position RA 10h 25m 13.97s Dec -53d 31m 19.8s. J2000 positions. Unfiltered magnitude 5.5.

2025 06 25.515

Correction to the time of independent discovery. Correct date and time is June 25.515 UT. Visual magnitude estimate 5.6 on June 25.575 UT. Andrew Pearce, Nedlands, Western Australia.

2025 06 25.5794

Following the posting on the Central Bureau's Transient Object Confirmation Page regarding a possible nova in Vela (TOCP Designation: TCP PNV J10251200-5331109), we performed follow-up observations of this object using a 0.35-m f/3.0 reflector telescope equipped with a CMOS camera, located near Perth, Western Australia, and operated by SPACEFLUX company. In images taken on June 25.57, 2025, we confirm the presence of an optical counterpart with an unfiltered CMOS magnitude of approximately +7 (this value is a lower limit due to strong saturation in the 1-second exposure, indicating the object is likely significantly brighter), at coordinates R.A. = 10 25 13.89, Decl. = -53 31 21.0 (equinox 2000.0; astrometry based on Gaia DR2 catalogue reference stars). An animation showing a comparison between our image and an archive POSS plate (1996): - https://tinyurl.com/novavela - Ernesto Guido & Marco Rocchetto (SPACEFLUX)

2025 06 26.368

Bright H-alpha object visible at the location of the nova using DSLR and 50 mm F/1.2 lens with H-alpha filter. Nova has brightened to magnitude 4.9, unfiltered image with DSLR and 50 mm F/1.2 lens on June 26.368 UT. John Seach, Grafton, NSW, Australia.

2025 06 26.4592

Follow-up photometry results were B =5.26, V =4.98, R =4.75, I =4.07. position RA 10 25 13.90, Dec -53 31 18.9. magnitude was measured with 0.5sec x sixteen stacked image. Comparison star was TYC 8600 2985, (V=7.808, B-V=+0.986). using 0.51-m f/6.8 reflector + CCD + f/4.5 focal reducer (T30); remotely Siding Spring. observed by K. Yoshimoto, Yamaguchi, Japan.