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THE ASTRONOMER Electronic Circular No 3715      2022 Jun 16 16.41UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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V415 MUSCAE = NOVA MUSCAE 2022
The Central Bureau has been informed of the discovery of a nova (at Sloan g 
magnitude 9.5) by the All-Sky Automated Survey for Supernovae (reported by K. 
Z. Stanek for the ASAS-SN team, according to E. O. Waagen, AAVSO) on an image 
obtained on June 10.13 UT.  

The variable is located at:
RA 13h24m31s.30, DEC-72d10'30".3 (J2000.0).  Waagen notes that P.
Schmeer finds that pre-discovery ASAS-SN data show that the nova had reached 
its maximum magnitude of 8.7 (g) on 2022 June 8.  A. Pearce, Nedlands, W. 
Australia, writes that he obtained a confirming CCD image of the nova on June 
10.935 with a 200-mm ASA H8 Hyperbolic telescope (+ luminence filter) at the 
Skygems Observatory in Namibia, measuring magnitude 9.8 and position end 
figures 31s.31, 30".3.  

Follow-up images obtained remotely by E. Guido, M. Rocchetto, and A. Valvasori 
with a "Telescope Live" 0.6-m f/6.5 astrograph at El Sauce, Chile, on June 
11.06 show the nova at R mag about 8.1 with position end figures 31s.34, 30".2 
(Gaia DR2 catalogue reference stars for the astrometry); their image compared 
to a Palomar Sky Survey plate from 1999 Feb. 13 can be viewed at website URL 
https://tinyurl.com/novamusca2.

Visual magnitude estimates:
June 10.978 UT, 9.9 (A. Amorim, Florianopolis, Brazil, 9-cm refractor); 
11.923, 10.2 (Amorim); 12.08, 10.4 (J. G. de S. Aguiar, Campinas, Brazil, 
0.27-m reflector; clouds; moonlight); 12.901, 10.4 (Amorim); 13.905, 10.8 
(Amorim); 14.02, 10.5 (Aguiar; moonlight); 15.01, 10.5 (Aguiar; moonlight).

Slected photometric magnitudes supplied by Waagen:  June 11.035 UT, I = 8.03 
(F.-J. Hambsch, Mol, Belgium, remotely from Atacama, Chile); 11.036, R = 8.57 
(Hambsch); 11.066, B = 10.34 (E. Gomez, Sylva, NC, USA); 11.067, V = 9.81 
(Gomez); 12.032, I = 8.32 (Hambsch); 12.032, V = 10.14 (Hambsch); 12.033, B = 
10.30 (Hambsch); 12.033, R = 8.71 (Hambsch); 14.027, I = 8.80 (Hambsch); 
14.027, V = 10.52 (Hambsch); 14.027, B = 10.53 (Hambsch); 14.028, R = 9.00 
(Hambsch).  

Waagen adds that spectroscopy indicating the object to be a nova was obtained 
on June 11.423 UT by H. Barker (Nelson, New Zealand) with 20-cm Newtonian 
reflector (+ and L200 Littrow spectrograph with a 180-lines/mm grating; cf. 
website URL https://www.wis-tns.org/object/2022mmp).

E. Kazarovets writes that the permanent GCVS designation V415 Mus has been 
assigned to this nova.

Guy M Hurst

