Electronic Telegram No. 5574
Central Bureau for Astronomical Telegrams
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V572 VELORUM = NOVA VELORUM 2025 = PNV J10251200-5331109
     John Seach, Grafton, NSW, Australia, reports his discovery of a possible
nova (mag 5.7) on three unfiltered images taken on June 25.440 UT with a
digital SLR camera (+ 50-mm-f.l. f/1.2 lens), the position given as R.A. =
10h25m12s.00, Decl. =  -53d31'10".9 (equinox J2000.0); the object was assigned
the designation PNV J10251200-5331109 when Seach posted it to the Central
Bureau's TOCP website.  Seach notes that nothing was visible at this location
on three images taken with the same equipment on May 24.506 (limiting mag
10.8), and nothing is visible at this location on a red Digital Sky Survey
image from the second Palomar Sky Survey.  Seach adds that an unfiltered
image taken on June 26.368 shows that the star had brightened to mag 4.9;
a bright H-alpha object is visible at the location of PNV J10251200-5331109
on an image taken at the same time (same equipment) with an H-alpha filter.
     Andrew Pearce (Nedlands, Western Australia) reports his independent
discovery of PNV J10251200-5331109 at mag 5.5 on unfiltered images taken on
June 25.515 UT with a Canon 800D camera (+ 85-mm-f.l. f/1.2 lens), providing
approximate position end figures 13s.97, 19s.8.  He estimated visual mag 5.6
on June 25.575.
     K. Yoshimoto, Yamaguchi, Japan, reports the following precise position
for PNV J10251200-5331109 from a CCD image obtained remotely on June 26.459 UT
using a 0.51-m f/6.8 reflector located at Siding Spring (NSW, Australis):
R.A. = 10h25m13s.90, Decl. = -53d31'18".9 (equinox J2000.0).  Yoshimoto also
provdes the following magnitudes for PNV J10251200-5331109 obtained with the
same telescope on June 26.459:  B = 5.26, V = 4.98, R = 4.75, I = 4.07
(comparison star TYC 8600 2985, V = 7.808, B-V = +0.986).
     E. Guido and M. Rocchetto (Spaceflux Italia, Venice, Italy) report that
unfiltered CMOS images obtained remotely using a 0.35-m f/3.0 reflector
located near Perth, W. Australia, on June 25.57 UT show a saturated image of
PNV J10251200-5331109 at R.A. = 10h25m13s.89, Decl. = -53d31'21".0 (equinox
2000.0; astrometry based on Gaia DR2 catalogue reference stars).  Nothing is
visible at this location on a red 1996 Palomar Sky Survey plate; a comparison
animation is posted at website URL https://tinyurl.com/novavela.
     R. H. McNaught, Coonabarabran, NSW, reports the following magnitudes for
PNV J10251200-5331109 from 60-s exposures taken at ISO 800 with a Canon 6D
camera (+ 135-mm-f.l. f/2.8 lens):  June 19.500 UT, [14.5; 20.568, 9.3:;
21.410, 8.0; 21.526, 8.0; 23.376, 6.2; 24.456, 5.9.
     Visual magnitude estimates of PNV J10251200-5331109 reported to the
Central Bureau:  June 25.89 UT, 5.4 (A. Amorim, Florianopolis, Brazil);
25.91, 5.3 (J. G. de S. Aguiar, Campinas, Brazil); 25.917, 5.2 (W. Souza,
Sao Paulo, Brazil); 25.92, 5.2 (L. Camargo da Silva, Sao Jose dos Campos, Sao
Paulo, Brazil); 26.356, 5.3 (McNaught).
     E. Kazarovets (Institute of Astronomy, Moscow) writes that the permanent
GCVS designation V572 Vel 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 2025 CBAT
2025 June 26                     (CBET 5574)              Daniel W. E. Green