September 19, 2004 00:20:49 UT Comet P/2004 NL21 ( LINEAR ) The following improved orbital elements by Kenji Muraoka, are from 80 observations 1996 Sept. 8 to 2004 Sept. 18, perturbations by 9 Plantes, Moon and 5 minor planets were taken into account. The mean residual is +/- 0.64 arc seconds. Epoch = 2004 Oct. 2.0 TT JDT = 2453280.5 T = 2004 Oct. 13.02505 +/- 0.00883 (m.e.) TT Peri. = 17.99433 +/- 0.00370 Node = 337.06191 +/- 0.00006 (2000.0) Incl. = 17.25699 +/- 0.00012 q = 2.0828157 +/- 0.0000205 AU e = 0.4769129 +/- 0.0000051 a = 3.9817757 +/- 0.0000139 AU nK = 0.12404775 +/- 0.00000065 P = 7.945 +/- 0.0000416 years T = 1996 Nov. 9.64918 TT Epoch = 1996 Nov. 13.0 TT Peri. = 17.92919 e = 0.4786531 Node = 337.10223 (2000.0) a = 3.9668282 AU Incl. = 17.29250 nK = 0.124749549 q = 2.0680936 AU P = 7.901 years Residuals in seconds of arc 960908 566 0.7- 0.1- 040808 704 1.5+ 0.7+ 040908 704 0.8+ 0.4+ 960908 566 0.3+ 0.1- 040808 699 1.1- 0.3- 040908 704 0.9+ 1.2+ 960908 566 0.1+ 0.1+ 040808 699 1.1- 0.2- 040908 704 0.9+ 1.3+ 960915 566 0.1+ 0.1+ 040808 699 0.7- 0.5- 040908 704 0.2+ 0.8+ 960915 566 0.2- 0.2+ 040808 699 0.3- 0.3- 040908 704 0.1+ 0.9+ 960915 566 0.0 0.3+ 040809 704 (0.6+ 2.5-) 040909 704 (0.0 2.0+) 040715 704 0.1- 0.4- 040809 704 1.1- 0.9- 040909 704 0.4+ 0.3+ 040715 704 0.8+ 0.3- 040809 704 1.0- 0.1+ 040909 704 0.2+ 0.7+ 040715 704 0.1- 0.3- 040809 704 1.5+ 0.4+ 040909 704 0.1- 0.3- 040715 704 0.3- 0.5+ 040809 704 0.3- 0.4- 040909 704 0.1- 0.3+ 040716 704 0.3- 0.1- 040810 704 0.2+ 0.1- 040909 699 1.3- 0.7- 040716 704 0.5- 0.1- 040810 704 0.5+ 0.0 040909 699 1.2- 0.9- 040716 704 0.9+ 1.2+ 040810 704 0.1+ 0.1+ 040909 699 0.5- 0.1- 040722 699 0.8- 0.3- 040810 704 0.7- 0.0 040909 699 0.4- 0.3- 040722 699 0.3- 0.4+ 040810 704 0.2- 0.2+ 040913 704 1.3+ 0.1+ 040722 699 0.1- 0.5+ 040812 704 0.2- 0.1+ 040913 704 1.1+ 0.8+ 040722 699 0.3- 0.7- 040812 704 0.4- 0.2+ 040913 704 0.2+ 0.4+ 040727 704 0.6+ 0.5- 040812 704 0.6- 0.1+ 040913 704 1.1+ 1.0+ 040727 704 0.2+ 0.1- 040812 704 0.2+ 0.4+ 040913 704 0.4- 0.7+ 040727 704 0.5- 0.3+ 040812 704 1.3- 0.1- 040915 699 0.5- 0.6- 040727 704 0.6+ 0.3+ 040823 691 1.3+ 0.1+ 040915 699 0.1- 0.7- 040728 704 0.3+ 1.2- 040823 691 1.5+ 0.0 040915 699 1.1- 1.0- 040728 704 0.8+ 0.1- 040823 691 1.5+ 0.1+ 040915 699 0.6- 1.0- 040728 704 0.0 0.6+ 040906 E12 0.9- 0.8- 040918 E12 0.4- 0.6- 040808 704 0.8+ 0.1+ 040906 E12 0.5- 0.7- 040918 E12 0.4+ 0.0 040808 704 0.9+ 0.1+ 040906 E12 0.9- 0.9- 040918 E12 0.3+ 0.4+ 040808 704 0.6+ 0.1+ 040906 E12 1.2- 1.1- 040918 E12 0.0 0.2- 040808 704 0.1+ 0.5+ rev. T TT Peri. Node i q e P epoch -13 1893 Dec. 16.13340 25.45066 346.64720 19.51235 2.6333342 0.3950833 9.083 1893 Dec. 3 -12 1902 Aug. 9.63651 22.32573 343.61730 18.84427 2.4617036 0.4196007 8.735 1902 July 30 -11 1911 May 12.45233 22.38432 343.61003 18.81189 2.4764683 0.4182146 8.782 1911 May 4 -10 1920 Feb. 23.88555 22.49450 343.49362 18.81174 2.4734757 0.4184524 8.772 1920 Feb. 6 - 9 1928 Nov. 24.60931 22.53748 343.48846 18.80884 2.4676284 0.4190035 8.753 1928 Nov. 10 - 8 1937 June 30.01126 23.96396 340.99967 18.40210 2.3563960 0.4348776 8.514 1937 July 6 - 7 1946 Jan. 15.29712 24.05370 340.94972 18.36452 2.3738601 0.4331544 8.570 1946 Jan. 20 - 6 1954 Aug. 8.03448 24.28284 340.84956 18.38036 2.3568367 0.4351665 8.523 1954 Aug. 6 - 5 1963 Mar. 12.15422 24.61475 340.77122 18.30039 2.4001702 0.4305111 8.652 1963 Apr. 1 - 4 1971 Oct. 24.92199 24.71667 340.68740 18.28477 2.3905255 0.4312601 8.617 1971 Oct. 16 - 3 1980 June 14.93273 24.81047 340.58114 18.26579 2.3985660 0.4306845 8.648 1980 June 10 - 2 1989 Jan. 27.72864 24.88084 340.54191 18.28575 2.3838145 0.4318964 8.595 1989 Feb. 3 --