Central Bureau for Astronomical Telegrams
IAUC 3278: N Cyg 1978; TIME ADJUSTMENT ON 1978 Dec. 31
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Circular No. 3278
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758
NOVA CYGNI 1978
S. Yang, University of British Columbia; and R. Carlberg,
University of Victoria, report that a change in the blue wing of the
H-alpha emission profile, suggesting absorption, was detected between
Sept. 18.46 and 19.20 UT. A series of eight spectra obtained with
the U.B.C. 1024 Reticon system on the Dominion Astrophysical
Observatory's 120-cm telescope had a resolution of 0.48 A/pixel (20
A/mm). No short-term variations were evident in the profile.
R. J. Pfeiffer, University of Pennsylvania and Trenton State
University, provides the following polarization data: in the red,
P = 1.63 +/- 0.07 percent, theta(equatorial) = 31o.5 +/- 1o.2 on Sept. 16.05
UT; green, P = 1.45 +/- 0.09 percent, theta = 35o.0 +/- 1o.7 on Sept. 16.08;
blue, P = 1.71 +/- 0.07 percent, theta = 31o.7 +/- 1o.2 on Sept. 16.10;
ultraviolet, P = 2.55 +/- 0.08 percent, theta = 30o.6 +/- 0o.9 on Sept. 16.14.
V. Piirola and T. Korhonen, Tuorla Observatory and the University
of Turku, report that the following linear polarization data
were obtained on Sept. 16.83 UT: in the V band, P = 1.52 +/- 0.02
(m.e.) percent, theta(equatorial) = 41o.6 +/- 0o.4 (m.e.); B, P = 1.60 +/-
0.02 percent, theta = 39o.9 +/- 0o.4; U, P = 1.48 +/- 0.03 percent, theta =
37o.7 +/- 0o.7. Assuming the polarization to be interstellar, the lower
limits for the interstellar absorption and reddening were found to
be: A(V) = 0.53 magnitude, E(B-V) = 0.18 magnitude.
L. Baldinelli, Bologna, communicates the following photoelectric
data, obtained using the 40-cm reflector at the Horn D'Arturo
Observatory: Sept. 12.8403 UT, V = 6.35 +/- 0.01, B-V = +0.63 +/- 0.03,
U-B = -0.04 +/- 0.03; 14.8517, 6.66 +/- 0.00, +0.50 +/- 0.01, -0.44 +/-
0.01; 18.8488, 7.40 +/- 0.05; +0.29 +/- 0.06, -0.75 +/- 0.11. For the
comparison star, HD 206280, it was assumed that mv = 6.72, B-V =
-0.06, U-B = -0.21.
Visual magnitude estimates: Sept. 26.29 UT, 8.2 (P. L. Collins,
Mount Hopkins Observatory); 28.13, 8.5 (J. McMahon, Millville, NJ);
30.03, 8.3 (J. Bortle, Brooks Observatory); Oct. 1.02, 8.2 (Bortle);
3.01, 8.9 (S. O'Meara, Harvard College Observatory).
TIME ADJUSTMENT ON 1978 DECEMBER 31
The Bureau International de l'Heure informs us that a positive
leap second will occur such that the sequence of UTC second markers
will be: 1978 Dec. 31d23h59m59s, 31d23h59m60s, 1979 Jan. 1d00h00m00s.
1978 October 4 (3278) Brian G. Marsden
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