Central Bureau for Astronomical Telegrams
IAUC 2776: SN IN NGC 4102; 1974c; 1975b; 1975c; 1975d
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Circular No. 2776
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
SUPERNOVA IN NGC 4102
Mr. J. R. Dunlap, Corralitos Observatory, Northwestern University,
reports that a supernova has been discovered by Yvonne Dunlap
and himself 21" east and 27" north of the nucleus of NGC 4102 (R.A. =
12h03m.8, Decl. = +52o59', equinox 1950.0). On May 7.1284 UT the
photovisual magnitude was 16.7.
COMET LOVAS (1974c)
The following improved orbital elements, by B. G. Marsden, are
from 45 observations 1974 Mar. 21 to 1975 Mar. 18. Perturbations
by all nine planets were taken into account.
Epoch = 1975 Aug. 16.0 ET
T = 1975 Aug. 22.1809 ET Peri. = 261.3649
e = 0.999656 Node = 11.6714 1950.0
q = 3.011402 AU Incl. = 50.6417
1975/76 ET R. A. (1950) Decl. Delta r m1
June 17 12 12.67 -69 32.4 2.514 3.082 12.9
27 12 08.24 -69 03.4
July 7 12 10.22 -68 41.7 2.594 3.046 12.9
17 12 17.98 -68 31.7
27 12 30.97 -68 35.1 2.697 3.023 13.0
Aug. 6 12 48.93 -68 51.1
16 13 11.87 -69 17.2 2.813 3.012 13.0
26 13 39.86 -69 49.3
Sept. 5 14 13.0 -70 21.3 2.937 3.015 13.1
15 14 51.3 -70 46.4
25 15 34.1 -70 56.9 3.071 3.030 13.3
Oct. 5 16 19.9 -70 45.4
15 17 06.8 -70 06.9 3.219 3.058 13.4
25 17 52.53 -68 59.6
Nov. 4 18 35.37 -67 24.8 3.382 3.099 13.6
14 19 14.38 -65 26.4
24 19 49.33 -63 09.6 3.560 3.151 13.7
Dec. 4 20 20.48 -60 39.2
14 20 48.31 -58 00.1 3.746 3.214 13.9
24 21 13.31 -55 16.2
Jan. 3 21 35.94 -52 30.6 3.933 3.286 14.1
13 21 56.60 -49 46.0
23 22 15.60 -47 04.4 4.108 3.369 14.3
m1 = 6.0 + 5 log Delta + 10 log r
PERIODIC COMET WEST-KOHOUTEK-IKEMURA (1975b)
Extension of the ephemeris on IAUC 2756:
1975 ET R. A. (1950) Decl. Delta r m2
May 28 7 44.61 +40 38.3 2.206 1.705 19.0
June 7 8 19.79 +39 57.0
17 8 53.12 +38 45.8 2.414 1.826 19.5
27 9 24.34 +37 11.0
July 7 9 53.45 +35 18.6 2.628 1.954 20.0
17 10 20.54 +33 13.9
27 10 45.78 +31 01.6 2.843 2.086 20.5
PERIODIC COMET KOHOUTEK (1975c)
Dr. Elizabeth Roemer, Lunar and Planetary Laboratory, provides
the following precise position, obtained with the 154-cm reflector
at the Catalina Station. Measurer: Carolyn C. McCarthy.
1975 UT R. A. (1950) Decl. m2
Mar. 13.14306 5 10 25.58 +20 30 30.9 ~17.3
Dr. Roemer adds that a 40-min exposure with the Steward Observatory
229-cm reflector on May 5.1 UT showed the comet to be unexpectedly
bright. There was a strong condensation of m2 ~ 16.5 and possibly
a tail at least 1' long to the south of east.
COMET BRADFIELD (1975d)
The following precise positions have been reported:
1975 UT R. A. (1950) Decl. Observer
Apr. 14.32760 3 25 31.22 -15 32 59.6 Kilmartin
14.33941 3 25 34.39 -15 32 47.8 "
23.36319 4 06 19.33 -12 44 04.1 Herald
23.36618 4 06 20.37 -12 44 02.1 "
24.36285 4 10 48.69 -12 24 31.8 "
24.37188 4 10 50.96 -12 24 26.4 "
24.71910 4 12 24.81 -12 17 32.1 Hers
26.72882 4 21 23.16 -11 37 31.1 "
30.71181 4 38 59.80 -10 17 27.0 "
30.72569 4 39 03.86 -10 17 07.3 "
P. M. Kilmartin (Carter Observatory). The time of observation
could be uncertain by as much as 0.5 min. 41-cm reflector.
D. Herald (Woden, near Canberra). On Apr. 28 m1 was 9.5-10 and the
coma asymmetric about the nucleus (m2 ~ 12). 31-cm reflector.
J. Hers (Randburg, near Johannesburg). 20-cm Celestron telescope.
1975 May 9 (2776) Brian G. Marsden
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