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IAUC 2776: SN IN NGC 4102; 1974c; 1975b; 1975c; 1975d

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IAUC number


                                                  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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