Nova in Cen: V1935 Cen (N Cen 2025 = PNV J14372177-5847400)
Abstract:
V1935 Cen (N Cen 2025 = PNV J14372177-5847400) was discovered by John Seach (Grafton, NSW, Australia) at unfiltered magnitude 6.2 on DSLR images obtained on 2025 Sep. 22.396 UT (via CBET 5611, ed. D. W. E. Green). SPECTROSCOPY: Low-resolution spectroscopy by R. Kaufman (Bright, Victoria, Australia) obtained on 2025 Sep. 23.383 UT indicates the object to be a classical nova (via CBET 5611). COORDINATES (J 2000): RA 14 37 21.80 Dec. -58 47 40.8 (VSX). NEARBY STARS: A. Pearce reports Gaia DR3 5879255150965919104 (G magnitude 16.7), located within 0.35". E. Guido, M. Rocchetto, and L. Izzo report Gaia DR3 5879255150966541696 (G-band magnitude 20.85), located approximately 1.302" away (via CBET 5611). PHOTOMETRY: see Justification. LIGHT CURVE: View the light curve via the AAVSO Light Curve Generator (https://www.aavso.org/LCGv2/). IMAGES: Animation by Guido et al. (via CBET 5611) comparing their image taken Sep. 22.55 UT and a 1993 POSS plate posted at URL https://tinyurl.com/PNCEN202
Justification:
The AAVSO requests coverage of this nova with observations of all types (visual, CCD/CMOS, DSLR, spectroscopy) and in all filters as it evolves. All novae are worthy of as good coverage as possible for as long as possible to support research on novae being carried out now and in the future. Spectroscopy is also encouraged where possible. See sections below for cadence and other observing recommendations. NOTES: The name PNV J14372177-5847400 was assigned when Seach's discovery report was submitted to the IAU CBAT TOCP. E. Kazarovets (Inst. of Astronomy, Moscow) reports assignment of the GCVS name V1935 Cen (via CBET 5611). PHOTOMETRY (selected from observations submitted to the AAVSO): 2025 Sep. 21.366 UT, <11.0 unfiltered DSLR (Seach); 22.55, 5.8 unfiltered CMOS (E. Guido, M. Rocchetto, and L. Izzo, remotely from near Moorook, Australia, via CBET 5611); 22.9125, 6.4 (A. Amorim, Florianopolis, Brazil); 23.4688, 7.0 (N. Brown, Yanchep, W. Australia); 23.4885, 6.970 TG (A. Pearce, Nedlands, Western Australia); 23.4885, 7.276 TB (Pearce); 23.4956, 7.416 B +/-0.001 (Pearce); 23.4959, 7.197 V +/-0.001 (Pearce); 23.496, 6.8 (Pearce); 23.4961, 6.159 R +/-0.001 (Pearce); 23.4963, 5.354 I +/-0.001 (Pearce); 23.9200, 7.5 (J. Aguiar da Silva, Campinas, Brazil); 23.9521, 7.5 (Amorim); 25.4729, 7.4 (Pearce); 25.4756, 7.7 (Brown); 24.7278, 7.5 CV DSLR (S. O'Meara, Maun, Botswana).
Requested Data Types:
Photometry, Spectroscopy
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| V1935 Cen | 5.80 | N |
Cadence: Custom Precision: 100 mmag |
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), 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/). Field is very crowded.
Co-Authorship
Observers are 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 nova, 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 nova 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 nova evolves."
Additional Submission Location:
Not provided
Notes:
No public notes