Electronic Telegram No. 5007
Central Bureau for Astronomical Telegrams
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V606 VULPECULAE = NOVA VULPECULAE 2021 = TCP J20210770+2914093
     Koichi Itagaki, Yamagata, Japan, reports his discovery of a variable on
a CCD image taken on July 16.475 UT using a 180-mm lens; a confirming
unfiltered CCD image taken on July 16.492 with a 0.5-m f/6 reflector yields
magnitude 12.0 and position R.A. = 20h21m07s.70, Decl. = +29d14'09".3
(equinox J2000.0).  Nothing is visible at this position on a CCD image taken
by Itagaki with the 180-mm lens on 2021 July 15.489 (limiting mag 14.2).
Itagaki posted an image at URL http://k-itagaki.jp/images/2021-Vul.jpg.  When
the variable was posted to the Central Bureau's TOCP webpage, it was
automatically assigned the designation TCP J20210770+2914093.
     Additional CCD magnitudes reported for TCP J20210770+2914093 (unfiltered
unless noted otherwise):  July 14.395 UT, [17.0 (ASAS-SN Sky Patrol, via P.
Schmeer, Saarbruecken-Bischmisheim, Germany); July 16.147, 13.2 (ASAS-SN, via
Schmeer); July 16.178, 13.0 (ASAS-SN, via Schmeer); July 16.190, 13.0
(ASAS-SN, via Schmeer); July 16.545, R = 11.8 +/- 0.1 (F. Watanabe, Nayoro,
Japan, 0.4-m f/10 Meili telescope; position end figures 07s.67, 10".0; UCAC4
references stars); July 16.565, B = 13.13, V = 12.28, R_c = 11.68, I_c = 11.15
(S. Kiyota, Kamagaya, Japan, 0.25-m f/6.3 Schmidt-Cassegrain reflector; image
posted at URL http://meineko.sakura.ne.jp/ccd/TCP_J20210770+2914093.jpg);
July 16.753, B = 12.77 (N. Ikonnikova and K. Sokolovsky, SAI, Moscow State
University, using a 0.6-m telescope at Kislovodsk, Russia, position end
figures 07s.70, 09".2; APASS reference stars); July 16.756, V = 12.19, R_c =
11.46, I_c = 11.24 (Ikonnikova and Sokolovsky); July 16.836, R_c = 10.7 +/-
0.1 (N. Ruocco, Sorrento, Italy, 0.35-m f/10 Meade LX200 reflector; reference
stars from GAI DR2 catalogue); July 16.900, 12.4 (R. Fidrich, Budapest,
Hungary, using an iTelescope 0.15-m refractor + green filter at Nerpio, Spain;
image posted at URL https://twitter.com/fidusz/status/1416585687558725639);
July 16.96, 11.2 (J. G. Bosch, Dauban, France, 0.40-m f/2.8 Newtonian
reflector; UCAC-4 reference stars); July 17.121, V = 12.84 (K. Yoshimoto,
Yamaguchi, Japan, image obtained remotely with an iTelescope 0.32-m f/8
reflector at Nerpio, Spain; position end figures 07s.69, 09".0; image posted
at http://orange.zero.jp/k-yoshimoto/TCP_J20210770+29140931_210210717.jpg);
July 17.461, 12.4 (Itagaki); July 17.584, 12.6 (Itagaki); July 20.888, 11.7
(G. Masi, Ceccano, Italy, 0.43-m robotic telescope; position end figures
07s.70, 09".0); July 24.202, V = 12.10, B = 12.73 (F. Romanov, Yuzhno-Morskoy,
Nakhodka, Russia; remotely using a 0.355-m f/6.2 Schmidt-Cassegrain telescope
at Abbey Ridge Observatory, Stillwater Lake, NS, Canada); July 24.203, R_c =
11.44 (Romanov); July 24.204, I_c = 10.84 (Romanov); July 29.247, V = 10.95
(Romanov); July 29.248, B = 11.62, R_c = 10.38 (Romanov); July 29.249, I_c =
9.78 (Romanov).
     Schmeer adds that he found no previous brightenings of this variable in
ASAS-SN Sky Patrol images since 2015 Feb. 27, and he notes that a possible
progenitor is catalogued as Gaia EDR3 1861166838700691968 (position end
figures 07s.704, 09".09, magnitude G = 21.0 in 2016), as SDSS
J202107.70+291409.0 (magnitudes g = 22.3, r = 21.7, i = 21.4), and as
Pan-STARRS1 source PSO J202107.703+291409.136 (magnitudes g = 21.8, r = 21.3,
i = 21.1).  R. Leadbeater, Wigton, U.K., writes that a low-resolution (R
about 500) spectrogram taken on July 16.915 UT (instrumentation not
specified) shows strong Balmer lines in emission showing P-Cyg profiles with
an estimated velocity of about 1400 km/s, adding that there are other broad
emission lines including He; the spectrogram has been posted at website URL
https://britastro.org/specdb/data_graph.php?obs_id=10094.  The AAVSO informs
us that spectroscopy by Munari et al. on July 17, 18, and 28 indicate this
to be an Fe-II-type nova.
     E. Kazarovets writes that the permanent GCVS designation V606 Vul has
been given to this nova.


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

                         (C) Copyright 2021 CBAT
2021 July 31                     (CBET 5007)              Daniel W. E. Green