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IAUC 4313: 1987d; N Her 1987

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                                                  Circular No. 4313
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 617-495-7244/7440/7444


COMET TERASAKO (1987d)
     Improved parabolic orbital elements from MPC 11614:

         T = 1986 Dec. 24.8975 ET    Peri. = 195.6091
                                     Node  =  96.9334   1950.0
         q =   0.395122 AU           i     =  40.8496

     1987 ET      R.A. (1950) Decl.     Delta      r       m1
     Feb. 14     1 14.18    -17 51.9    1.614    1.239     9.0
          19     1 33.92    -15 03.0
          24     1 51.43    -12 27.4    1.819    1.416     9.8
     Mar.  1     2 07.15    -10 05.3
           6     2 21.42    - 7 56.0    2.042    1.586    10.6
          11     2 34.50    - 5 58.8
          16     2 46.61    - 4 12.6    2.275    1.751    11.2
          21     2 57.91    - 2 36.2
          26     3 08.53    - 1 08.7    2.510    1.910    11.8
          31     3 18.58    + 0 10.7
     Apr.  5     3 28.13    + 1 23.0    2.742    2.065    12.3
          10     3 37.25    + 2 28.6
          15     3 46.00    + 3 28.3    2.967    2.215    12.8

     R. H. McNaught reports that a 30-min J exposure by D. Waldon
on Jan. 29.45 UT with the U.K. Schmidt telescope shows a narrow
100' gas tail in p.a. 93 deg and a dust fan from this point, through
p.a. 180 deg, increasing in intensity and length to 15' in p.a. 238 deg.
     Further total visual magnitude estimates:  Jan. 27.84 UT, 8.5
(J. Campos, Warner Beach, R.S.A., 0.13-m refractor); 29.44, 7.2 (D.
Seargent, The Entrance, N.S.W., 15x80 binoculars); Feb. 1.11, 7.5
(C. S. Morris, Lockwood Valley, CA, 20x80 binoculars; 4.41, 8.0 (J.
Kobayashi, Kumamoto, Japan, 0.31-m refl.); 6.44, 8.3 (Seargent);
18.14, 8.7 (Morris, Whitaker Peak, CA, 0.26-m reflector).


NOVA HERCULIS 1987
     H. Kosai, Tokyo Astronomical Observatory, reports that a
prediscovery photograph by M. Honda on Jan. 22.85 UT yields mv = 8.8.
     Visual magnitude estimates (cf. IAUC 4309):  Feb. 2.54 UT, 7.9
(P. Collins, Tucson, AZ);  5.42, 7.4 (C. Scovil, Stamford, CT);
8.53, 8.1 (Collins); 10.42, 9.3 (Scovil); 11.41, 9.5 (Scovil);
13.41, 8.8 (Scovil); 16.77, 8.5 (McNaught, Coonabarabran, N.S.W.).


1987 February 18               (4313)            Daniel W. E. Green

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