------------------------------------------------------------------- THE ASTRONOMER Electronic Circular No 1328 1998 Aug 15 17.30UT Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074 INTERNET: GUY@TAHQ.DEMON.CO.UK GMH at AST.STAR.RL.AC.UK WORLD WIDE WEB http://www.demon.co.uk/astronomer ------------------------------------------------------------------- COMET 1998 P1 (WILLIAMS) Preliminary parabolic elements for the comet reported in EC 1326, from 25 astrometric observations Aug 11-12, indicate this comet will be unobservable from the UK until December when it might be 10th mag in the morning sky. T 1998 Oct 16.95 TT w 292.81 ) e 1.00000 O 156.09 ) 2000.0 q 1.1623 A.U. i 145.62 ) Source: IAUC 6988 Positions are geocentric m = 7.5 + 5.0 log R + 10.0 log r Ephemeris using Eph.exe: Date R.A. (2000) Dec. R r Elong Mag. Motion h m o ' (AU) (AU) o "/hr P.A. 1998 Aug 15.00 14 35.93 -59 41.8 1.053 1.519 94.7 9.4 203 327 20.00 14 13.45 -54 23.6 1.142 1.473 86.0 9.5 166 333 25.00 13 59.75 -49 50.6 1.239 1.428 78.1 9.5 136 337 30.00 13 50.91 -46 0.7 1.339 1.385 70.7 9.5 112 340 1998 Sept 4.00 13 44.94 -42 47.4 1.440 1.345 63.8 9.6 93 343 9.00 13 40.78 -40 3.9 1.539 1.308 57.4 9.6 78 345 14.00 13 37.81 -37 44.1 1.634 1.274 51.2 9.6 67 347 19.00 13 35.64 -35 43.3 1.723 1.244 45.4 9.6 58 349 24.00 13 34.02 -33 57.5 1.805 1.218 39.9 9.6 51 350 29.00 13 32.77 -32 23.4 1.879 1.197 34.5 9.6 45 351 1998 Oct 4.00 13 31.77 -30 58.6 1.943 1.181 29.5 9.7 41 352 9.00 13 30.95 -29 40.9 1.997 1.169 24.9 9.7 38 352 14.00 13 30.23 -28 28.8 2.041 1.163 20.8 9.7 35 353 19.00 13 29.59 -27 20.9 2.073 1.163 17.5 9.7 33 353 24.00 13 28.96 -26 16.1 2.094 1.168 15.7 9.8 32 352 29.00 13 28.32 -25 13.3 2.103 1.178 15.8 9.8 31 352 1998 Nov 3.00 13 27.62 -24 11.7 2.100 1.194 17.7 9.9 31 351 8.00 13 26.82 -23 10.3 2.085 1.214 21.0 9.9 31 349 13.00 13 25.88 -22 8.2 2.060 1.239 25.2 10.0 32 347 18.00 13 24.74 -21 4.5 2.024 1.268 30.0 10.1 34 345 23.00 13 23.32 -19 58.0 1.978 1.301 35.2 10.1 36 342 28.00 13 21.53 -18 47.3 1.923 1.338 40.6 10.2 39 339 1998 Dec 3.00 13 19.28 -17 30.9 1.859 1.377 46.3 10.2 44 336 8.00 13 16.44 -16 7.1 1.788 1.420 52.3 10.3 50 333 13.00 13 12.88 -14 33.5 1.711 1.464 58.7 10.3 57 330 18.00 13 8.41 -12 47.4 1.628 1.511 65.3 10.4 67 327 23.00 13 2.80 -10 45.6 1.543 1.559 72.4 10.4 80 325 28.00 12 55.81 -8 24.1 1.456 1.609 80.0 10.4 96 323 Martin Mobberley