Electronic Telegram No. 5570
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


V462 LUPI = NOVA LUPI 2025
     The Central Bureau was alerted by A. Pearce (Nedlands, W. Australia) that
K. Z. Stanek has reported online (on June 14) the discovery of a possible nova
("AB" magnitude 8.7, with a Sloan g filter) on an image obtained (presumably
with the double 14-cm "Brutus" telescope at Haleakala, Hawaii) apparently on
June 12.87 UT in the course of the "All-Sky Automated Survey for SuperNovae"
(ASAS-SN), with the position given as R.A. = 15h08m03s.27, Decl. =
-40d08'29".6 (equinox J2000.0 presumed).
     R. H. McNaught (Coonabarabran, NSW, Australia) provides the following
magnitude estimates for the new variable from unfiltered images taken with a
Canon EOS 6D camera (+ 135-mm-f.l. f/2.8 lens at ISO 800):  June 4.678 UT,
[14.7; 4.778, [14.3; 5.447, [13.2; 5.477, [12.8; 13.378, 8.0; 13.418, 8.0;
13.460, 8.1; 13.501, 8.3; 13.544, 8.2; 13.590, 8.2; 13.634, 8.2; 13.678, 8.1;
13.715, 8.1; 13.753, 8.2; 14.340, 7.8.  He used AAVSO B chart X40333FK and D
chart X40333IC for comparison-star magnitudes.  McNaught also provides the
following visual magnitude estimates with 10x42 binoculars:  June 14.452, 8.1;
15.408, 7.2; 16.383, 6.4.
     Additional visual magnitude estimates received by the Central Bureau:
June 15.892 UT, 6.8 (A. Amorim, Florianopolis, Brazil); 15.948, 6.8 (W.
Souza, Sao Paulo, Brazil); 15.95, 6.7 (J. G. de S. Aguiar, Campinas, Brazil).
     Spectroscopy (wavelength 400-800 nm, resolution R about 400) by Y. Tampo
using the 1-m Lesedi telescope at the South African Astronomical Observatory
in Sutherland on June 14.745 UT was obtained of this new variable; a
normalized spectrogram shows the Balmer lines, and either He I or Fe II lines,
with P-Cy profiles.  The P-Cyg profiles of H-alpha and H-beta have absorption
minima around -1200 and -900 km/s, respectively.  Tampo suggests that the
inferred large brightness outburst and these spectral features suggest that
this is a new classical nova (details are given at the following website URL:
https://www.astronomerstelegram.org/?read=17228).
     E. Kazarovets writes that the permanent GCVS designation V462 Lup has
been given to this new 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 16                     (CBET 5570)              Daniel W. E. Green