Electronic Telegram No. 5017
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


RS OPHIUCHI
     Further to CBET 5015, B. Wang (Shaoxing, Zhejiang, China) and L.-p. Lou
(Shaoxing, Zhejiang, China) report the following estimated magnitudes of the
rising outburst of RS Oph in its early stages, from images obtained with a
Sony A7M2 camera (+ 20-mm f/2.8 lens), using comparison-star magnitudes from
AAVSO charts:  Aug. 8.531 UT, [10; 8.574, 9.1; 8.578, 8.4; 8.632, 7.0.  They
have posted images at website URLs http://nova.astrometry.net/image/11658797
and http://nova.astrometry.net/image/11658847.
     The following additional visual magnitude estimates, showing the decline
in brightness of RS Oph after its recent outburst, have been received by the
Central Bureau:  Aug. 8.983 UT, 4.9 (W. Souza, Praia do Pauba, SP, Brazil,
naked eye); 9.97, 5.0 (J. G. de S. Aguiar, Campinas, Brazil, 11x80
binoculars); 10.457, 5.3 (R. H. McNaught, Coonabarabran, NSW, Australia,
2.3x40 binoculars); 10.539, 5.3 (McNaught); 10.97, 5.2 (Aguiar, 20x50
binoculars); 11.083, 5.2 (Souza, 10x50 binoculars); 11.465, 5.8 (McNaught);
11.91, 5.7 (Aguiar); 12.469, 6.0 (McNaught, 10x42 binoculars); 12.598, 6.1
(McNaught); 13.378, 6.6 (McNaught); 13.622, 6.6 (McNaught); 14.367, 6.9
(McNaught); 15.600, 7.1 (McNaught).  McNaught used comparison-star magnitudes
from AAVSO RS Oph charts.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2021 CBAT
2021 August 15                   (CBET 5017)              Daniel W. E. Green