Electronic Telegram No. 5357
Central Bureau for Astronomical Telegrams
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V6620 SAGITTARII = PNV J18025353-2914151 = NOVA SAGITTARII 2024
     I. Endoh, National Astronomical Observatory of Japan, reports the
discovery by Yuji Nakamura (Kameyama, Mie, Japan) of a possible nova (mag 9.7)
on two 10-s CMOS exposurse (limiting mag 13.0) taken on Jan. 24.870 UT using
a 10-cm f/3 refractor.  Nothing is visible at this location on frames taken
between 2023 Sept. 29 and 2023 Nov. 15 with the same instrument.  The position
of the variable was given as R.A. = 18h02m53s.53, Decl. = -29d14'15".1
(equinox J2000.0), and the provisional designation PNV J18025353-2914151 was
assigned to the star when it was posted to the Central Bureau's TOCP webpage.
Additional magnitudes reported to the Bureau for PNV J18025353-2914151:
2024 Jan. 26.855, [10.5 (T. Kato, Shimizu, Shizuoka, Japan, Canon EOS 6D
camera + 200-mm-f.l. lens; reported by K. Itagaki, Yamagata, Japan; image
posted at website URL http://k-itagaki.jp/images/PN-Sgr-2024-01.jpg);
Jan. 28.874, 10.2 (Nakamura; as above); Jan. 28.877, 9.9 (Itagaki, 0.35-m f/11
telescope + KAF-1001E CCD; position end figures 53s.54, 16".1; image posted at
http://k-itagaki.jp/images/PN.Sgr-2024-01.jpg); Jan. 29.727, 10.8 (R. Kaufman,
Bright, Victoria, Australia, Canon 800D camera + 200-mm-f.l. f/3.5 lens; image
posted at URL https://www.flickr.com/photos/199988457@N04/53497403400);
Jan. 29.867, 10.8 (Kato, 400-mm.-f.l. lens; image posted at website URL
http://k-itagaki.jp/images/PN-Sgr-2024-01-K.jpg); Feb. 2.851, 10.2 (T.
Noguchi, Katori, Japan; 0.23-m f/10 Schmidt-Cassegrain telescope + unfiltered
KAF-0261E CCD; position end figures 53s.58, 14".2; image posted at website URL
http://park8.wakwak.com/~ngc/images/PNVinSgr_20240202.jpg); Feb. 13.769, V =
11.55 (A. Pearce, Nedlands, Western Australia, remotely using a 0.50-m f/6.8
reflector + CCD at Siding Spring, NSW, Australia; position end figures 53s.48,
15".0, Gaia DR2 reference stars).  Pearce notes that his position is 1".1 away
from a 14.3-magnitude star (Gaia DR3 4062388426016744448), which is also a
long-period variable (OGLE-BLG-LPV-190334).
     Low-resolution spectroscopy (range 400-800 nm) of PNV J18025353-2914151
was obtained by J. Strader et al. on Feb. 1.4 UT at high airmass in morning
twilight with the 4.1-m Southern Astrophysical Research (SOAR) Telescope
located at Cerro Pachon, Chile.  The spectrum is consistent with that of a
classical nova, showing a flat continuum with strong broad emission lines; the
strongest lines are H-alpha (FWHM about 1300 km/s), H-beta, and O I; emission
lines from He I, N II, and Fe II are also seen. (Details are provided at URL
http://www.astronomerstelegram.org/?read=16428).
     E. Kazarovets writes that the permanent GCVS designation V6620 Sgr 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 2024 CBAT
2024 February 23                 (CBET 5357)              Daniel W. E. Green