Electronic Telegram No. 5012 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 V606 VULPECULAE R. E. Schmidt, Burleith Observatory, Washington, DC, reports the detection of a photometric period for this nova (cf. CBET 5007) of 3.0960 +/- 0.0391 hours, with a Cousins I-band amplitude of 0.0122 magnitude (mean curve), based on 836 CCD observations (0.32-m astrograph) over 13.14 days (epoch 2021 Aug. 3.0958 UT). Observed I_c magnitudes: July 24.166, 10.82; 26.1132, 10.53; 28.1782, 9.99; Aug. 3.1067, 8.79; 5.2439, 9.55; 6.1912, 9.71. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2021 CBAT 2021 August 8 (CBET 5012) Daniel W. E. Green