THE ASTRONOMER Electronic Circular No 515       1991 Apr 28 09.36UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP, England. Telephone:  (0256)471074 Int:+44256471074
Telex: 9312111261 Answerback: TA G                     JANET BOXES:
GMH at UK.AC.CAM.ASTRONOMY.STARLINK or GUYH at UK.AC.SUSSEX.CLUSTER
TELECOM GOLD: 10074:MIK2885                       PRESTEL 256471074
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COMET HELIN-LAWRENCE (1991l)
Improved orbital elements:(cf E498)
T  1992 Jan  20.2520 E.T.    w 271.12330 )
e  1.00000000                O  11.12850 ) 1950.0
q  1.5196180 A.U.            i  95.47430 )
Source: IAUC 5247    Positions are geocentric
Ephemeris by Hurst using a program developed by N.James:
m =  4.5 + 5.0 log R + 10.0 log r
  Date    R.A. (1950) Dec.     R       r     Elong  Mag.    Motion
          h  m       o  '     (AU)    (AU)     o          "/hr P.A.
1991 Apr
  28.00  12 29.02   +8 57.6   2.778   3.647  144.8  12.3    59  264
  29.00  12 27.45   +8 54.9   2.777   3.637  143.7  12.3    59  263
  30.00  12 25.88   +8 52.1   2.777   3.628  142.5  12.3    58  263
1991 May
   1.00  12 24.33   +8 49.1   2.777   3.618  141.3  12.3    58  262
   2.00  12 22.79   +8 45.9   2.777   3.608  140.1  12.3    57  262
   3.00  12 21.27   +8 42.6   2.778   3.598  138.8  12.3    57  261
   4.00  12 19.75   +8 39.1   2.779   3.589  137.6  12.3    57  261
   5.00  12 18.26   +8 35.5   2.780   3.579  136.4  12.3    56  260
   6.00  12 16.78   +8 31.7   2.782   3.569  135.2  12.2    56  260
   7.00  12 15.31   +8 27.7   2.784   3.559  134.0  12.2    55  260
   8.00  12 13.86   +8 23.7   2.786   3.550  132.8  12.2    54  259
   9.00  12 12.43   +8 19.4   2.788   3.540  131.6  12.2    54  258
  10.00  12 11.02   +8 15.0   2.791   3.530  130.4  12.2    53  258
  11.00  12  9.62   +8 10.5   2.794   3.520  129.2  12.2    53  257
  12.00  12  8.25   +8  5.8   2.798   3.511  128.0  12.2    52  257
  13.00  12  6.90   +8  1.0   2.801   3.501  126.8  12.2    51  256
  14.00  12  5.56   +7 56.1   2.805   3.491  125.6  12.2    51  256
  15.00  12  4.25   +7 51.0   2.809   3.481  124.4  12.2    50  255
  16.00  12  2.96   +7 45.7   2.813   3.471  123.2  12.2    49  254
  17.00  12  1.69   +7 40.3   2.818   3.462  122.0  12.1    49  254
  18.00  12  0.44   +7 34.8   2.823   3.452  120.8  12.1    48  253
  19.00  11 59.21   +7 29.2   2.828   3.442  119.6  12.1    47  252
  20.00  11 58.01   +7 23.4   2.833   3.432  118.5  12.1    47  252
  21.00  11 56.83   +7 17.5   2.838   3.422  117.3  12.1    46  251
  22.00  11 55.67   +7 11.5   2.844   3.413  116.1  12.1    45  250
  23.00  11 54.54   +7  5.3   2.850   3.403  115.0  12.1    45  250
  24.00  11 53.43   +6 59.0   2.855   3.393  113.8  12.1    44  249
  25.00  11 52.34   +6 52.7   2.862   3.383  112.7  12.1    43  248
  26.00  11 51.28   +6 46.2   2.868   3.373  111.5  12.1    42  247

P/COMET MRKOS (1991k)
Improved orbital elements and ephemeris:
T  1991 Mar  18.9902 E.T.    w 180.42390 )
e  0.55037000                O   0.97780 ) 1950.0
q  1.4087290 A.U.            i  31.36090 )
Source: IAUC 5248    Positions are geocentric
m = 13.0 + 5.0 log R + 10.0 log r
  Date    R.A. (1950) Dec.     R       r     Elong  Mag.    Motion
          h  m       o  '     (AU)    (AU)     o          "/hr P.A.
1991 Apr
  14.00  11 25.29  -29 14.0   0.493   1.436  145.4  13.0   120  218
  24.00  11  7.13  -34 23.2   0.566   1.460  134.7  13.4    76  214
1991 May
   4.00  10 57.90  -37 49.0   0.652   1.492  126.5  13.8    45  199
  14.00  10 56.72  -40 12.4   0.747   1.529  120.2  14.2    31  167
  24.00  11  2.25  -42  1.3   0.846   1.572  115.2  14.6    34  136
Guy M Hurst