Electronic Telegram No. 5444
Central Bureau for Astronomical Telegrams
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V1725 SCORPII = NOVA SCORPII 2024 No. 3 = TCP J17064645-3528079
     Koichi Itagaki, Yamagata, Japan, reports his discovery of an apparent
nova (mag 11.4) on unfiltered CCD images obtained with a 180-mm-f.l. f/2.8
camera lens on Sept. 9.436 UT, giving the position as R.A. = 17h06m46s.45,
Decl. = -35d28'07".9 (equinox 2000.0).  The provisional designation TCP
J17064645-3528079 was assigned to this object when Itagaki posted it to the
Central Bureau's TOCP webpage.  A confirming CCD image by Itagaki on Sept.
9.486 yielded mag 10.7 and position end figures 46s.57, 06".3; his image is
posted at website URL http://k-itagaki.jp/images/Sco-2024-09.jpg.
     An independent discovery of TCP J17064645-3528079 was made by Andrew
Pearce (Nedlands, Western Australia) on Sept. 4.474 UT at mag 11.3 on three
unfiltered images obtained with a Canon 800D camera (+ 85-mm-f.l. f/1.2 lens);
he reported position end figures 45s.71, 04".6.  CCD imaging by Pearce on
Sept. 9.579 with a 0.05-m f/5 refractor yielded magnitudes TG = 11.1, TB =
11.9, TR = 10.43 and position end figures 46s.54, 06".7 (Gaia DR3 reference
stars); he adds that there is no obvious progenitor star at this position,
noting a star of mag G = 20.6 that is 1".6 away (Gaia 5977230501831148928).
Additional CCD imaging by Pearce using a 0.36-m f/8 reflector at the Skygems
Observatory in Namibia yields V = 10.60, B = 11.75, and position end figures
46s.55, 06".7.
     Additional magnitudes for TCP J17064645-3528079 that were reported to the
Central Bureau:  Aug. 11.444 UT, [12.0 (Pearce); Sept. 6.503, [14 [R. H.
McNaught, Coonabarabran, NSW, Australia; Canon 6D camera + 135-mm-f.l. f/2.8
lens, ISO 800); 9.407, [11.6 (S. Ueda, Kushiro, Hokkaido, Japan; Canon EOS 6D
camera + 200-mm-f.l. f/3.0 lens, 3-s unfiltered exposures; via I. Endoh,
National Astronomical Observatory of Japan); 9.410, 11.5 (McNaught;
unfiltered); 9.497, 11.4 (McNaught); 9.512, B = 12.53, V = 11.29, I = 9.59 (K.
Yoshimoto, Yamaguchi, Japan; remotely using a 0.51-m f/6.8 reflector + CCD at
Siding Spring Observatory; position end figures 46s.52, 06".9; image posted at
http://orange.zero.jp/k-yoshimoto/TCPJ17064645-3528079_20240909.jpg); 9.528,
R = 10.6 (E. Guido and M. Rocchetto, using a "Telescope Live" 0.1-m f/3.6
astrograph + CMOS located at Yass, NSW, Australia; position end figures 46s.54,
07".0, Gaia DR2 stars; image posted at https://tinyurl.com/possnovasco;
comparison with Palomar Survey at URL https://tinyurl.com/possnovasco24);
9.571, 10.9 (McNaught); 10.437, V = 10.3 (T. Yusa, Osaki, Miyagi, Japan;
stacked G-band images with a ZWO Seestar 0.05-m f/5 All-in-One Smart
Telescope; Tycho Catalogue reference stars).
     Y. Tampo obtained spectroscopy on Sept. 9.764 UT with the 1.9-m telescope
at the Sutherland Observatory of the South African Astronomical Observatory
(range 450-700 nm; resolution about 3000) that shows Balmer and HE i lines
with P-Cyg profiles (the absorption minimum of this profile at H_alpha was
about 1400 km/s), concluding that this is a new classical nova (cf. website
URL http://www.astronomerstelegram.org/?read=16808).
     E. Kazarovets writes that the permanent GCVS designation V1725 Sco 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 September 10                (CBET 5444)              Daniel W. E. Green