Nakano Note (Nakano wa Kangaeru noda) NK 2327 Return Comets in 2015 (Predictions from former NK orbits)

D/1886 K1 (Brooks 1) T = 2015 Jan. 21.55471 TT Epoch = 2015 Jan. 18.0 TT Peri. = 192.69439 e = 0.5740105 Node = 44.91872 (2000.0) a = 3.1951098 AU Inc. = 10.87482 n'= 0.17257401 q = 1.3610834 AU P = 5.711 years From an orbit using 42 observations 1886 May 25-July 3 by Oppenheim (1892). Publ. Kuffner Sternw. 2, 43, N5. D/1884 O1 (Barnard 1) T = 2015 Mar. 13.94120 TT Epoch = 2015 Feb. 27.0 TT Peri. = 339.82227 e = 0.5714135 Node = 332.90302 (2000.0) a = 3.0830980 AU Inc. = 9.30466 n'= 0.18206358 q = 1.3213743 AU P = 5.414 years From an orbit using 179 observations 1884 Aug. 24-Nov. 8 by Buckley (1979). J. Br. Astron. Assoc, 89, 256. 34D/Gale T = 2015 Sept. 8.34402 TT Epoch = 2015 Sept.15.0 TT Peri. = 218.61918 e = 0.7599279 Node = 57.31600 (2000.0) a = 5.0175846 AU Inc. = 10.57809 n'= 0.08769241 q = 1.2045819 AU P = 11.239 years A1 = +1.961 A2 = +0.75891 From an orbit using 35 observations 1927-1938, mean residual 2".40 by Nakano (2001). See NK 786. Kobayashi gives T= 2015 Oct. 7.09557 TT from 35 observations 1927-1938, mean residual 3".52. A1 = +1.67, A2 = +0.9870 (2012). D/1766 G1 (Helfenzrieder) T = 2015 Nov. 4.71582 TT Epoch = 2015 Oct. 25.0 TT Peri. = 175.80384 e = 0.8518987 Node = 93.42277 (2000.0) a = 2.7253012 AU Inc. = 8.82311 n'= 0.21906970 q = 0.4036207 AU P = 4.499 years From an orbit using 22 observations 1766 Apr. 9-May 3 by Yeomans, Quart. J. Roy. Astron. Soc. 26, 114. P/2004 R1 (McNaught) T = 2015 Aug. 12.26401 TT Epoch = 2015 Aug. 6.0 TT Peri. = 0.74951 e = 0.6848372 Node = 295.94308 (2000.0) a = 3.0993224 AU Inc. = 4.90036 n'= 0.18063585 q = 0.9767911 AU P = 5.456 years From 44 observations 2004 Sept. 2-2004 Nov. 9, mean residual 0.71. Prediction from an orbit in NK 1143. P/1998 QP54 (LONEOS-Tucker) T = 2015 Dec. 25.98417 TT Epoch = 2016 Jan. 13.0 TT Peri. = 30.61405 e = 0.5512731 Node = 341.59927 (2000.0) a = 4.2043772 AU Inc. = 17.64923 n'= 0.11432773 q = 1.8866170 AU P = 8.621 years From 219 observations 1998 Aug. 2-1999 Feb. 14, mean residual 0".79.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 July 31

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