Follow-up Photometry of the M31 Nova AT2025ahzx
ATel #17568; K. Hornoch (Ondrejov), H. Kucakova, M. Wolf (Charles University), M. Serrau (Observatoire de Banon La Tuilerie - SAF), T. Vaccaro (Ball St. U.), A. W. Shafter (SDSU)
on 31 Dec 2025; 20:43 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Allen W. Shafter (ashafter@sdsu.edu)
Subjects: Optical, Nova, Transient
We report extensive multi-color photometry of the M31 nova AT2025ahzx (= M31N 2025-12e) previously reported in ATel#17558. Follow-up observations of the nova were taken with the Danish 1.54-m telescope at La Silla (D154), the 0.65-m telescope in Ondrejov (D65), the 0.4-m reflector in Banon (Alpes de Haute-Provence), France (B40), and the SARA Observatory's 1-m Jacobus Kapteyn Telescope (SARA) at the Roque de los Muchachos, La Palma, Spain. The resulting magnitudes are given in the table below.
Date [UT] | Exposure | Mag | Err | Filter | Telescope
2025 12 23.027 6x60s 17.52 0.05 R D154
2025 12 24.694 12x60s 16.72 0.06 R D65
2025 12 26.743 5x300s 17.26 0.09 V B40
2025 12 26.775 5x300s 16.97 0.07 r' B40
2025 12 26.801 6x300s 17.61 0.08 g' B40
2025 12 26.817 11x60s 16.97 0.07 R D65
2025 12 27.787 5x300s 17.35 0.12 g' B40
2025 12 27.812 6x300s 17.31 0.11 r' B40
2025 12 27.833 6x300s 17.40 0.11 V B40
2025 12 27.871 8x300s 16.35 0.16 i' B40
2025 12 28.678 12x70s 17.17 0.06 R D65
2025 12 28.793 5x300s 17.85 0.12 g' B40
2025 12 28.824 7x300s 17.58 0.11 r' B40
2025 12 28.849 7x300s 16.28 0.14 i' B40
2025 12 28.871 5x300s 17.85 0.14 v B40
2025 12 29.827 5x360s 17.49 0.13 R SARA
2025 12 29.862 8x300s 18.05 0.14 g' B40
2025 12 29.880 12x300s 17.49 0.13 r' B40
2025 12 30.736 9x300s 18.14 0.14 g' B40
As with all extragalactic novae, follow-up spectroscopic and photometric observations to confirm the nova's nature and determine its spectroscopic class and rate of decline (speed class) are encouraged.
