OAA computing section circular NK 1621 Missing Comet returns in 2011
D/1766 G1 (Helfenzrieder) T = 2011 Jan. 29.69451 TT Epoch = 2011 Feb. 8.0 TT Peri. = 11.56994 e = 0.8469781 Node = 255.54676 (2000.0) a = 2.7341537 AU Inc. = 3.96698 n'= 0.21800662 q = 0.4183854 AU P = 4.521 years From an orbit on QJ 26 using 22 observations 1766 Apr. 9-May 3. D/1895 Q1 (Swift) T = 2011 Mar. 1.39870 TT Epoch = 2011 Mar. 20.0 TT Peri. = 195.27009 e = 0.6112060 Node = 139.08542 (2000.0) a = 3.7969609 AU Inc. = 14.26741 n'= 0.13321401 q = 1.4762357 AU P = 7.399 years From an orbit by Belyaev on CC 1999 using 182 observations 1895 Aug. 24-Feb. 6. D/1884 O1 (Barnard 1) T = 2011 Mar. 7.93177 TT Epoch = 2011 Mar. 20.0 TT Peri. = 346.40655 e = 0.5699816 Node = 328.78090 (2000.0) a = 3.0971046 AU Inc. = 9.98003 n'= 0.18082991 q = 1.3318118 AU P = 5.450 years From an orbit by Berberich using 243 observations 1884 July 23-Nov. 20. D/1960 S1 (van Houten) T = 2011 Apr. 23.31272 TT Epoch = 2011 Apr. 29.0 TT Peri. = 46.61866 e = 0.3508316 Node = 359.34206 (2000.0) a = 6.2639388 AU Inc. = 7.51912 n'= 0.06286846 q = 4.0663512 AU P = 15.677 years From 8 observations by Nakano using 1960 Sept. 24-Oct. 26, mean residual 0".53. 3D/Biela T = 2011 July 29.93073 TT Epoch = 2011 July 18.0 TT Peri. = 264.46308 e = 0.7730800 Node = 203.62459 (2000.0) a = 3.5041332 AU Inc. = 7.64336 n'= 0.15025646 q = 0.7951579 AU P = 6.560 years From an orbit on AJ 76 using 26 observations 1826-1852, mean residual 1".70. D/1952 B1 (Harrington-Wilson) T = 2011 July 30.10986 TT Epoch = 2011 July 18.0 TT Peri. = 0.82007 e = 0.5938550 Node = 118.44615 (2000.0) a = 3.1474289 AU Inc. = 14.39143 n'= 0.17651035 q = 1.2783125 AU P = 5.584 years From an orbit in NK 839 by Nakano using 7 observations 1952 Jan. 30-Feb. 25, mean residual 0".49.
Director, Computing Section Syuichi Nakano 2008 May 8