Electronic Telegram No. 5260
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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Prepared using the Tamkin Foundation Computer Network


V6597 SAGITTARII = NOVA SAGITTARII 2023 No. 2 = TCP J17583414-2652300
     Koichi Itagaki, Yamagata, Japan, reported his discovery of a variable
star (unfiltered mag 12.0) on digital images obtained on May 16.698 UT with a
106-mm refractor (+ CMOS camera), with the position given as R.A. =
17h58m34s.14, Decl. = -26d52'30".0 (equinox J2000.0).  When Itagaki posted
the discovery to the Central Bureau's TOCP webpage, the provisional
designation TCP J17583414-2652300 was automatically given.  Additional CCD
magnitudes for TCP J17583414-2652300 received by the Central Bureau:  May
15.920, 13.1 (K. Sokolovsky, S. Korotkiy, N. Potapov, O. Smolyankina, A.
Prokudina, and S. Ostapenko, 135-mm f/2.0 telephoto lens + unfiltered SBIG
ST-8300M camera; pre-discovery); May 16.745, V = 13.91, R_c= 12.41, I_c =
11.03 (S. Kiyota, Kamagaya, Japan, 0.28-m reflector; annotated image posted
at website URL https://meineko.com/ccd/TCP_J17583414-2652300.jpg); May 17.636,
V = 14.77, B = 17.09 (A. Pearce, Nedlands, W. Australia, using a 0.35-m R-COP
reflector at Perth Observatory; position end figures 34s.19, 29".5 using Gaia
DR2 stars); May 18.07, 14.4 (Sokolovsky et al., 80-mm refractor + Canon EOS
600D camera); May 18.656, V = 14.90, I = 10.99, R = 12.76, B = 17.30 (Pearce).
Sokolovsky et al. have posted their images at the following website URL:
http://scan.sai.msu.ru/~kirx/img/TCPJ17583414-2652300/.
     K. Taguchi and K. Isogai, University of Kyoto, report on spectroscopy
obtained by Taguchi on May 16.78 UT with a fiber-fed integral field
spectrograph (KOOLS-IFU) on the 3.8-m telescope Seimei at the Okayama
observatory of Kyoto University.  The spectrum (resolution about 500) shows
absorption velocities with P-Cyg profiles of -570 km/s for H-alpha and -450
km/s for O I 777.3-nm, with Taguchi judging this to be a slow-rising 
classical nova that is highly reddened.
     E. Kazarovets writes that the permanent GCVS designation V6597 Sgr has
been assigned to this nova.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2023 CBAT
2023 May 19                      (CBET 5260)              Daniel W. E. Green