Central Bureau for Astronomical Telegrams
IAUC 2782: SNe; AL Com; Occn OF epsilon Gem BY MARS ON 1976 Apr. 8; 1973m; 1975d
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Circular No. 2782
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
SUPERNOVAE
Mr. J. R. Dunlap, Corralitos Observatory, Northwestern University,
reports the discovery by Yvonne Dunlap and himself of a suspected
supernova 5" east and 10" south of the nucleus of NGC 2935
(R.A. = 9h34m.5, Decl. = -20o54', equinox 1950.0). The object was at mpv
about 15 on May 14, 15 and 16 UT.
Mr. Dunlap also informs us that the supernova in NGC 4102 (cf.
IAUC 2776) had faded to mpv 17.4 on May 15.1 UT.
AL COMAE BERENICES
Mr. C. Scovil, Stamford Museum, provides the following visual
magnitude estimates (cf. IAUC 2760): Apr. 2.17 UT, 14.4; 10.11, 14.7.
Dr. L. Rosino, Director of the Asiago Astrophysical Observatory,
sends the following photographic magnitudes: Feb. 9, ~19;
Apr. 12, 15.05; 18, 15.50. He adds that the outburst was at least
as long in duration as that of 1961 and that a long series of
plates taken at Asiago shows that the star has its minimum at mpg ~
19-19.5 (rather than at mpg 22, as is given in the General Catalogue
of Variable Stars).
OCCULTATION OF epsilon GEMINORUM BY MARS ON 1976 APRIL 8
Mr. G. E. Taylor, H.M. Nautical Almanac Office, writes that
this event will be visible from the North Pacific, North and Central
America, the northern part of South America, the North Atlantic,
western Europe and northwest Africa; from the Pacific Ocean
and the western half of North America the occultation will occur in
daylight. The following selected local circumstances are based on
the FK4 position and proper motion of the star and on a
recently-computed ephemeris of Mars supplied by the Jet Propulsion
Laboratory; the adopted radius of Mars is 3394 km.
Disappearance Reappearance Altitude of
UT P UT P star sun
Hawaii 0h52m2 134o 0h56m3 237o 47o +52o
Tonantzintla 0 56.8 143 1 00.3 228 77 - 3
Palomar Mtn. 0 54.5 115 0 59.4 256 80 +14
McDonald Obs. 0 55.5 119 1 00.3 253 82 + 3
Washington 0 56.9 94 1 02.0 278 59 -16
Toronto 0 56.6 87 1 01.7 284 59 -12
Caracas 0 59.1 142 1 02.7 230 46 -36
Jamaica 0 58.0 132 1 02.2 239 58 -24
Bermuda 0 57.8 98 1 02.9 273 50 -28
Lisbon 0 59.2 49 1 02.6 323 7 -44
The northern limit of the occultation is as follows (where C is the
change in the latitude Lat. corresponding to a difference of -0".1 in
the relative declination (in the sense planet minus star):
UT Long. Lat. Alt. C UT Long. Lat. Alt. C
0h59m8 +10o3 +55o9 15o -2o6 1h00.0 + 2o9 +51.3 9o -2o4
0 59.9 + 7.0 +53.8 12 -2.5 1 00.1 - 5.0 +46.7 3 -2.3
PERIODIC COMET BORRELLY (1973m)
The following precise positions have been measured by C. Y.
Shao from plates taken by R. E. McCrosky and G. Schwartz with the
155-cm reflector at Harvard Observatory's Agassiz Station:
1975 UT R. A. (1950) Decl.
Mar. 5.34826 14 25 43.92 +24 49 03.0
19.25156 14 16 04.98 +26 30 16.9
COMET BRADFIELD (1975d)
The following precise positions have been reported:
1975 UT R. A. (1950) Decl. m2 Observer
Apr. 16.33656 3 34 36.40 -14 57 06.8 12.5 Gilmore
16.35045 3 34 39.93 -14 56 50.7 "
18.31590 3 43 33.57 -14 20 44.7 12.2 "
18.32953 3 43 37.18 -14 20 29.9 "
28.36146 4 28 38.30 -11 04 50.4 Herald
28.36493 4 28 39.47 -11 04 46.2 "
May 1.71007 4 43 22.73 - 9 57 07.4 Hers
2.72049 4 47 47.32 - 9 36 38.0 "
3.36944 4 50 36.20 - 9 23 32.3 Herald
3.39306 4 50 42.60 - 9 22 57.8 "
7.70868 5 09 13.28 - 7 56 08.3 Hers
10.71493 5 21 50.85 - 6 56 22.6 "
11.71354 5 25 59.09 - 6 36 46.9 "
A. C. Gilmore (Carter Observatory). 41-cm f/13.5 Cassegrain
reflector. Measurer: Pamela M. Kilmartin.
D. Herald (Woden, near Canberra). 31-cm reflector.
J. Hers (Randburg, near Johannesburg). 20-cm reflector.
1975 May 20 (2782) Brian G. Marsden
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