View here: Details for Nova in Oph: V4371 Oph (N Oph 2025 = TCP J17301230-2753488 = AT 2025wyg)
Abstract: V4371 Oph (N Oph 2025 = TCP J17301230-2753488 = AT 2025wyg) was discovered by Tadashi Kojima (Tsumagoi, Gunma-ken, Japan) on 2025 Sep. 5.433 UT, magnitude 12.5 unfiltered (Canon EOS 6D CMOS). SPECTROSCOPY by Mitugu Fujii (Okayama, Japan) using the Fujii Kurosaki Observatory 0.4-m telescope + NLS-II spectrograph (res ~1000) on 2025 Sep. 6.423 UT shows a nova; continuum is highly reddened. Spectrum at https://otobs.org/FBO/fko/n/tcp_j1730123-2753488/tcp_j17301230-2753488.htm (via CBET 5603). COORDINATES (J 2000): RA 17 30 12.30 Dec. -27 53 48.8 (VSX). NEARBY STARS: A. Pearce (Nedlands, W. Australia) reports nova is 0.4" from Pan-STARRS DR1 catalogue star 74522625511123781 (mag <20) and 1.4" from Gaia DR3 4061213018095504128 (G magnitude 20.6) (via CBET 5603). PHOTOMETRY: see Justification. LIGHT CURVE: View the light curve via the AAVSO Light Curve Generator (Enhanced LCG).
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. NOTE: E. Kazarovets (Inst. of Astronomy, Moscow) reports assignment of the GCVS name V4371 Oph (via CBET 5603, D. W. E. Green, Ed.). PHOTOMETRY (selected from observations submitted to the AAVSO): 2025 Aug. 30.461 UT, <13.0 unfiltered CMOS (T. Kojima, via CBET 5603); Sep. 5.406, 10.9 unfiltered CCD (K. Itagaki, Yamagata, Japan, prediscovery, via CBET 5603); 8.126, 12.85 B (K. Yoshimoto, Yamaguchi, Japan, remotely via Utah Desert Remote Observatory, Beryl Junction, UT, via CBET 5603); 8.126, 10.83 V (Yoshimoto); 8.126, 8.31 I (Yoshimoto); 8.6167, 12.627 B +/-0.012 (A. Pearce, Nedlands, W. Australia); 8.6171, 11.035 V +/-0.004 (Pearce); 8.6175, 9.798 R +/-0.002 (Pearce); 8.6178, 8.598 I +/-0.003 (Pearce); 8.6182, 11.055 V +/-0.005 (Pearce); 8.6186, 12.670 B +/-0.017 (Pearce); 8.6237, 12.611 B +/-0.018 (Pearce); 8.6240, 11.046 V +/-0.004 (Pearce); 8.6243, 9.802 R +/-0.003 (Pearce); 8.6246, 8.639 I +/-0.003 (Pearce). IMAGES: K. Itagaki, Sep. 5.406 UT http://k-itagaki.jp/images/Oph-25-09.jpg; K. Yoshimoto, Sep. 8.126 UT (via CBET 5603) http://orange.zero.jp/k-yoshimoto/TCP_J17301230-2753488_20250908.jpg
