Possible nova in Vel: PNV J10251200-5331109
Abstract:
The possible nova PNV J10251200-5331109 was discovered independently by John Seach (Grafton, NSW, Australia) on 2025 Jun 25.440 UT at unfiltered magnitude 5.7 (DSLR 50 mm f/1.2 lens), and by Andrew Pearce (Nedlands, Western Australia) on Jun 25.515 UT at unfiltered magnitude 5.5 (Canon 800D camera + 85mm f/1.2 lens). Its nature has not been confirmed spectroscopically. COORDINATES (J 2000): RA 10 25 13.88 Dec. -53 31 19.2. PROGENITOR: S. Otero (AAVSO) reports the likely progenitor is blue, large amplitude variability; DECaPS images show 22.2:V. He also notes that the object is nearly superimposed on the 16.8 B mag. galaxy LEDA 96477. PHOTOMETRY: see Justification. View the light curve via the AAVSO Light Curve Generator (https://www.aavso.org/LCGv2/).
Justification:
The AAVSO requests coverage of this object with observations of all types (visual, CCD/CMOS, DSLR, PEP, spectroscopy) and in all filters as it evolves.As good coverage as possible for as long as possible is requested. Spectroscopy is also encouraged where possible. See sections below for cadence and other observing recommendations. The name PNV J10251200-5331109 was assigned when the object was reported to the IAU CBAT Transient Objects Confirmation Page (TOCP, http://www.cbat.eps.harvard.edu/unconf/tocp.html). ADDITIONAL PHOTOMETRY (reported via the TOCP): 2025 Jun. 25.575 UT, 5.6 visual (A. Pearce); 25.5794, brighter than 7 (lower limit due to saturation; E. Guido and M. Rocchetto using SPACEFLUX 0.35-m f/3.0 reflector and CMOS camera in Perth, W. Australia). Download photometric/spectroscopic observations submitted to the AAVSO via the AAVSO Global Search (https://apps.aavso.org/v2/data/search/global/).
Requested Data Types:
Spectroscopy, Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| PNV J10251200-5331109 | 5.60 | N: |
Cadence: Custom Precision: 100 |
Cadence: Custom Resolution: 250 Desired SNR: 100 |
Spectroscopy Lines:
He II (4686.0 Å), H-beta (4861.0 Å), H-alpha (6563.0 Å)
Photometry Filters:
B (Johnson), V (Johnson), R (Cousins), I (Cousins), u (Sloan), g (Sloan), r (Sloan), i (Sloan), z (Sloan), Other (Please Specify)
Comparison Stars:
Finder charts with comparison stars may be created using the AAVSO Variable Star Plotter (VSP, https://apps.aavso.org/vsp/). An 'AB' scale chart shows comp stars as bright as 5th mag. Sebastian Otero (AAVSO) notes that there is a 20.7 Vmag. star 2.3" to the N.
Co-Authorship
Observers are not eligible for co-authorship.
Additional Observer Input:
Additional photometry filters and cadence: also TB, TG, TR. Cadence depends on rate of change and other behavior of the object, but at least one observation per night is recommended. Additional spectroscopy lines and cadence: Bowen blend (4640 A). Frequency of observation depends on the rate of decline, but Dr. Fred Walter (Stony Brook University) recommends a minimum of one observation per night per band. For spectroscopy, Dr. Walter recommends spectra in blue to observe He II 4686, H-beta, and the Bowen blend (4640A), in addition to H-alpha. Cadence for spectra depends on how fast the object continues to evolve, but, he adds, "you can't go wrong with a spectrum every clear night." Former AAVSO Spectroscopy Section co-leader Lauren Herrington adds: "Slitless spectra would also be valuable; spectra with resolution as low as R=100 are useful to track broad changes in emission as the object evolves."
Additional Submission Location:
Not provided
Forum URL
https://forums.aavso.org/t/observing-campaign-897-possible-nova-in-vel-pnv-j10251200-5331109/2770
Notes:
No public notes