View here: Details for Nova in Sgr: V7993 Sgr = N Sgr 2025 No. 3 = TCP J18022164-3310319
Abstract: V7993 Sgr (N Sgr 2025 No. 3 = TCP J18022164-3310319) was independently discovered by the NMW survey (Stanislav Korotkiy, Kirill Sokolovsky, Vladimir Belousov reporting for NMW team, Nizhnii Arkhyz, Karachay-Cherkessia, Russia) and by Tadashi Kojima (Tsumagoi, Gunma-ken, Japan). NMW DETAILS: 2025 Mar. 24.0555 UT, 12.2 unfiltered CCD. Second NMW camera on Mar. 24.0714 UT, 12.8 unfiltered +/-0.2. Mar. 15.081 UT image <13. KOJIMA DETAILS: 2025 Mar. 23.7635 UT, 13.5 unfiltered. Mar. 09.794 UT images <14.2. ADDITIONAL PHOTOMETRY: Mar 24.834 UT, 12.15B, 11.02V, 9.28Ic (K. Yoshimoto, Yamaguchi, Japan); Mar. 25.713, 11.91B, 10.62V, 9.83R, 8.94Ic (A. Pearce, Nedlands, Western Australia). Pearce notes no catalog star found within 2.6". For more data see Notes. SPECTROSCOPY by Y. Tampo (SAAO, U. Capetown) using SAAO 1-m Lesedi telescope on Mar 24.990 UT shows a classical nova (ATel #17108). NOTES: Located near dark nebula LDN 1762. Information from CBET 5530. Additional notes see Justification.
Justification: The AAVSO is requesting 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. ADDITIONAL NOTES: There is a very nearby 14.1 star; see Comparison and check stars below. E. Kazarovets (Inst. of Astronomy, Moscow) reports assignment of the GCVS name V7993 Sgr. Instrumentation: NMW cameras used (135-mm+unfiltered ST-8300M CCD). Kojima used Canon EOS 6D+300mm f/2.8 lens. Images: NMW - http://scan.sai.msu.ru/$kirx/img/TCPJ18022164-3310319/ ; Yoshimoto - http://orange.zero.jp/k-yoshimoto/TCP_J18022164-3310319_20250324.jpg. ATel #17108 link: https://www.astronomerstelegram.org/?read=17108 . Except for spectroscopy, information in this observing campaign was taken from IAU CBET 5530 (Daniel W. E. Green, editor); additional details may be found there. More photometry (all F.-J. Hambsch, Mol, Belgium): 2025 Mar. 26.41628 UT, 8.792 I +/-0.006; 26.41645, 8.810 I +/-0.006; 26.41672, 12.042 B +/-0.005; 26.41700, 12.036 B +/-0.005; 26.41729, 10.651 V +/-0.003; 26.41751, 10.636 V +/-0.003.
