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 ------------------------------------------------------------------- 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