Electronic Telegram No. 5135 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 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 R.A. = 13h24m31s.30, Decl. = -72d10'30".3 (equinox 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 reported to the Central Bureau for N Mus 2022: 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). Selected 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). Additional observations appear on AAVSO Alert Notice 781. 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. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2022 CBAT 2022 June 16 (CBET 5135) Daniel W. E. Green