Central Bureau for Astronomical Telegrams
IAUC 2830: N Cyg 1975; A0620-00
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Circular No. 2830
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
NOVA CYGNI 1975
The following photoelectric magnitudes have been reported:
1975 UT V B - V U - B V - R R - I b - y Observer
Aug. 30.3 1.98 +0.51 -0.81 +0.57 +0.15 Strittmatter
30.40 2.01 +0.40 Fawley
30.52 2.02 "
31.25 1.92 +0.64 -0.11 Schommer
31.3 1.87 +0.62 -0.65 +0.82 +0.21 Strittmatter
31.33 1.90 +0.64 +0.02 Tedesco
31.51 2.02 +0.65 -0.15 Schommer
Sept. 1.3 2.26 +0.55 -0.69 +1.03 +0.20 Strittmatter
1.31 2.61 +0.49 -0.21 Tedesco
1.47 2.80 +0.49 -0.40 Schommer
2.18 3.73 +0.34 -0.52 "
2.19 3.96 +0.38 Fawley
2.32 4.19 +0.35 "
2.38 4.24 +0.34 "
2.47 4.02 +0.31 -0.54 Schommer
P. A. Strittmatter et al. (University of Arizona).
W. Fawley (University of California, Berkeley).
R. Schommer and J. Deeter (University of Washington). From the
extremely rapid decline G. Wallerstein deduces M_v = -9.2.
E. F. Tedesco, A. Herzog, T. Schneeberger and G.Garwood(New Mexico
State University). Comparison star epsilon Cyg. Errors ~ +/- 0.02.
The following recent visual magnitude estimates have been
reported: Sept. 3.07, 4.2 (C. Sherrod, North Little Rock, Arkansas);
3.10, 3.7 (D. di Cicco, Waltham, Massachusetts); 3.21, 4.8
(Sherrod); 4.07, 4.8 (L. Jacchia, Cambridge, Massachusetts); 4.08,
4.9 (Sherrod); 4.10, 4.7 (di Cicco).
A0620-00
P. R. Warren, South African Astronomical Observatory, reports:
"Blue band observations made by Robertson using the 51-cm telescope
at Sutherland on Aug. 22, 23, 24 and 25 UT for periods of about 1.5
hr and with time resolution of about 3 min show the optical candidate
for A0620-00 to have an approximately constant B magnitude of
11.3, but to show variations of 0.1 magnitude on time scales of
between 30 and 60 min. B-V values ranged between +0.05 and +0.70."
1975 September 4 (2830) Brian G. Marsden
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