THE ASTRONOMER Electronic Circular No 555 1991 August 20 19.51UT
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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PERIODIC COMET HARTLEY 2 (1991t)
Improved orbital elements from MPC 18598:
Epoch = 1991 Sept.21.0 ET
T = 1991 Sept.11.6542 ET Peri. = 174.9337
e = 0.719489 Node = 226.0539 1950.0
q = 0.953285 AU Incl. = 9.2561
a = 3.398382 AU n = 0.1573243 P = 6.265 years
Ephemeris by Hurst using a program by N.James:
m = 10.5 + 5.0 log R + 15.0 log r
Date R.A. (1950) Dec. R r Elong Mag. Motion
h m o ' (AU) (AU) o "/hr P.A.
1991 Aug
22.00 5 21.80 +29 32.7 0.786 1.001 66.4 10.0 209 97
27.00 5 52.69 +28 27.3 0.802 0.981 64.4 9.9 202 101
1991 Sept
1.00 6 21.69 +27 0.7 0.822 0.966 62.7 9.9 193 104
6.00 6 48.64 +25 18.4 0.847 0.957 61.4 9.9 184 107
11.00 7 13.51 +23 25.4 0.875 0.953 60.4 9.9 174 110
16.00 7 36.39 +21 26.1 0.906 0.955 59.7 10.0 165 112
21.00 7 57.44 +19 23.6 0.937 0.963 59.4 10.1 156 113
26.00 8 16.83 +17 20.5 0.969 0.977 59.4 10.3 147 115
1991 Oct
1.00 8 34.71 +15 18.5 1.001 0.996 59.7 10.5 138 116
6.00 8 51.21 +13 19.1 1.031 1.019 60.2 10.7 130 117
11.00 9 6.46 +11 23.0 1.060 1.047 61.1 10.9 122 118
16.00 9 20.53 +9 31.1 1.087 1.079 62.2 11.2 114 119
21.00 9 33.52 +7 43.5 1.112 1.114 63.5 11.4 107 120
26.00 9 45.51 +6 0.6 1.134 1.152 65.1 11.7 99 120
31.00 9 56.53 +4 22.5 1.154 1.192 67.0 12.0 92 121
PERIODIC COMET LEVY (1991q)
Improved orbital elements by B. G. Marsden, Center for
Astrophysics, from 33 observations, June 15-Aug. 4 (MPC 18597):
T = 1991 July 8.1929 ET Peri. = 41.4773
e = 0.928837 Node = 328.7229 1950.0
q = 0.982521 AU Incl. = 19.1845
a = 13.806596 AU n = 0.0192121 P = 51.301 years
Ephemeris:
m = 7.5 + 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 Aug
22.00 7 1.82 +36 38.2 1.672 1.226 46.8 9.5 110 94
27.00 7 19.41 +36 18.1 1.707 1.274 47.9 9.7 103 97
1991 Sept
1.00 7 35.74 +35 51.8 1.740 1.324 49.2 9.9 97 99
6.00 7 50.85 +35 21.2 1.771 1.376 50.8 10.1 90 100
11.00 8 4.79 +34 47.7 1.798 1.430 52.6 10.3 84 102
16.00 8 17.62 +34 12.5 1.822 1.485 54.5 10.5 78 103
21.00 8 29.40 +33 36.8 1.843 1.541 56.7 10.7 73 104
26.00 8 40.19 +33 1.3 1.861 1.597 59.1 10.9 67 105
1991 Oct
1.00 8 50.02 +32 26.7 1.875 1.655 61.7 11.1 62 106
6.00 8 58.95 +31 53.8 1.886 1.712 64.5 11.2 56 106
11.00 9 6.99 +31 23.0 1.893 1.770 67.5 11.4 51 107
16.00 9 14.16 +30 54.7 1.898 1.828 70.6 11.5 46 107
21.00 9 20.49 +30 29.4 1.899 1.886 74.0 11.6 40 107
26.00 9 25.98 +30 7.3 1.897 1.944 77.6 11.8 35 107
31.00 9 30.64 +29 48.6 1.893 2.002 81.4 11.9 29 107
Guy M Hurst