Electronic Telegram No. 5423
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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Prepared using the Tamkin Foundation Computer Network


V615 VULPECULAE = NOVA VULPECULAE 2024 = PNV J19430751+2100204
     K. Sokolovsky, University of Illinois and Sternberg Astronomical
Institute; together with S. Korotkiy, N.Potapov, and S. Ostapenko, report the
discovery of an apparent nova (mag 11.2) on wide-field unfiltered CCD images
obtained with a 135-mm-f.l. f/2.0 telephoto lens in the course of the "New
Milky Way" (NMW) survey operating at the Astroverty astrofarm in Nizhnii
Arkhyz, Karachay-Cherkessia, Russia, on July 29.832 UT; the position was
given as R.A. = 19h43m07s.51, Decl. = +21d00'20".4 (equinox J2000.0), which
yielded the assignment of the preliminary designation PNV J19430751+2100204
when the variable was posted to the Central Bureau's TOCP webpage.  Nothing
was visible at this location on an NMW survey image taken on July 28.840
(limiting mag 14.5), and Sokolovsky et al. note that no previous outbursts
are present in ASAS-SN data (previous observation on July 27.492 showing
nothing to limiting mag 16.5).  The discovery images are available at the
following URL:  http://scan.sai.msu.ru/~kirx/img/PNVJ19430751+2100204/.
     Additional reported magnitudes for PNV J19430751+2100204:  July 29.513,
[14.0 (T. Kojima, Tsumagoi, Gunma-ken, Japan, Canon EOS 6D digital camera +
300-mm-f.l. f/2.8 lens); 30.513, 9.9 (R. Kaufman, Bright, Vic., Australia;
object appears quite red and highly saturated; "TG" magnitude); 30.521, V =
9.79, B = 11.51, I_c = 7.79 (K. Yoshimoto, Yamaguchi, Japan; 0.20-m f/8
reflector + CMOS; position end figures 07s.50, 21".4; image posted at URL
http://orange.zero.jp/k-yoshimoto/PNV_J19430751+2100204_20240730.jpg);
30.575, V = 9.86, TB = 11.40, TR = 9.21 (A. Pearce, Nedlands, W. Australia,
0.05-m f/5 refractor + CCD; position end figures 07s.49, 21".2; Gaia DR2
reference stars); 30.893, B = 11.52 +/- 0.01, V = 9.61 +/- 0.01, R_c = 8.46
+/- 0.01, I_c = 7.30 +/- 0.01 (E. Broens, Mol, Belgium, 0.28-m Schmidt-
Cassegrain telescope + CCD; Johnson-Cousins bands; position end figures
07s.52, 21".4); 31.515, V = 9.9 (T. Yusa, Osaki, Miyagi, Japan; stacked
G-band images with a ZWO Seestar 50-mm f/5 All-in-One Smart Telescope;
limiting mag 14.5; Hipparcos Catalogue reference stars); 31.874, B = 11.98
+/- 0.01, V = 10.24 +/- 0.01, R_c = 8.83 +/- 0.01, I_c = 7.50 +/- 0.01
(Broens).  Pearce notes that his position for PNV J19430751+2100204 (above)
is within 0".2 of Gaia star 1825912166611947136 (magnitude G = 19.8).
A. Amorim, Florianopolis, Brazil, reports visual mag 10.6 on Aug. 1.03 as
seen with a 0.09-m refractor (Tycho-2 catalogue reference stars via AAVSO).
Spectroscopy indicates that this is a reddened nova that is rapidly changing
(e.g., cf. http://www.astronomerstelegram.org/?read=16746).
     E. Kazarovets writes that the permanent GCVS designation V615 Vul 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 2024 CBAT
2024 August 1                    (CBET 5423)              Daniel W. E. Green