OAA computing section circular NK 470 The Observable Comets in the 1985

The following orbits of observable comets in the 1985 are calculated by S. Nakano. Comet Elias 1981 XV (from NK 434 orbit) Epoch = 1985 May 15.0 ET T = 1981 Aug. 18.86627 ET Peri. = 310.35199 e = 1.0012447 Node = 176.05847 1950.0 q = 4.7452640 AU Inc. = 115.32759 Periodic Comet Gunn (from MPC 7773 orbit) T = 1982 Nov. 27.00536 ET Epoch = 1985 May 15.0 ET Peri. = 197.09489 e = 0.3156473 Node = 67.89351 1950.0 a = 3.5978083 AU Inc. = 10.38123 nß= 0.14442655 q = 2.4621700 AU P = 6.824 years Comet Shoemaker 1984r (from IAUC 4011 orbit) T = 1984 Sept. 4.51011 ET Peri. = 183.22219 Node = 237.89559 1950.0 q = 5.4916875 AU Inc. = 179.20484 from 14 observations 1984 Oct. 23 - Nov. 16. Comet Levy-Rudenko 1984t T = 1984 Dec. 14.22508 ET Peri. = 82.63649 Node = 330.48548 1950.0 q = 0.9189154 AU Inc. = 65.78816 from 19 observations 1984 Nov. 14 - Nov. 29. Comet Shoemaker 1984s (IAUC 4012 orbit) T = 1985 Jan. 3.87877 ET Peri. = 229.23032 e = 0.9695468 Node = 222.76234 1950.0 q = 1.2142296 AU Inc. = 13.86986 from 13 observations 1984 Oct. 25 - Nov. 23. Periodic Comet Halley 1982i (from Yeomans's orbit #16) T = 1986 Feb. 9.44076 ET Epoch = 1985 May 15.0 ET Peri. = 111.83205 e = 0.9672851 Node = 58.13899 1950.0 a = 17.95159 AU Inc. = 162.24286 nß= 0.01295835 q = 0.5872838 AU P = 76.060 years - continued - The Observable Comets in the 1985 NK 470-2 Periodic Comet Spitaler 1890 VII (from QJ 14 orbit) T = 1986 May 17.1786 ET Epoch = 1986 May 10.0 ET Peri. = 30.9324 e = 0.471897 Node = 32.8647 1950.0 a = 3.479108 AU Inc. = 9.7392 nß= 0.1518806 q = 1.837328 AU P = 6.489 years Periodic Comet Howell 1981 X (from NK 424 orbit) T = 1987 Apr. 14.75817 ET Epoch = 1985 May 15.0 ET Peri. = 214.67515 e = 0.5083532 Node = 75.33450 1950.0 a = 3.2801235 AU Inc. = 5.56798 nß= 0.16590856 q = 1.6126623 AU P = 5.941 years Periodic Comet Wild 3 1980 VII (from NK 433 orbit) T = 1987 Aug. 30.95147 ET Epoch = 1985 May 15.0 ET Peri. = 179.54460 e = 0.3679429 Node = 72.02413 1950.0 a = 3.6236729 AU Inc. = 15.45763 nß= 0.14288301 q = 2.2903681 AU P = 6.898 years Periodic Comet Schwassmann-Wachmann 1 (from MPC 4830 orbit) T = 1989 Sept.10.99365 ET Epoch = 1985 May 15.0 ET Peri. = 46.43738 e = 0.0449432 Node = 312.13653 1950.0 a = 6.0597293 AU Inc. = 9.35369 nß= 0.066073032 q = 5.7873857 AU P = 14.918 years Editorial notice. We have changed the edition of NK circular and the Comet Handbook of the OAA to MS-DOS operating system. According to change editting system, it became possible for NK subscribers to provide NK circulars or Handbook 1985 on floppy disk. The provided floppy disks are 8-inch(2D) or 5-inch(2D, 2DD) on MS-DOS or PC-DOS normal format. For further informa- tion, please contact to editor. S. Nakano 1984 December 5 ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1984 December 5

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