491P/Spacewatch-PANSTARRS Orbit by S. Nakano CBET 5431 (2024) Observed in 2nd half of 2025
Equinox 2000.0 T/TT q (AU) e P Peri. Node Inc. Tail(AU) Epoch 2024 Sep. 5.58553 3.7151809 0.2587717 11.2 298.80184 311.68398 9.36703 0.200 2026 June 9.0 m1 = 11.0 + 5 log Delta + 7.5 log r Date/ 0h TT R.A.(1950) Decl. R.A.(2000) Decl. Delta r Daily motion Magnitude Mot./PA Elong. P PA/Tail Moon Age h m ¡ , h m ¡ , m , m1 , ¡ ¡ ¡ ¡ ¡ ¡ 2025 Dec. 31 20 49.83 -16 50.3 20 52.64 -16 38.9 5.060 4.256 +1.07 + 5.4 19.2 16.3/ 71 31.8 7.0 73/0.27 100 .84 2026 Jan. 10 21 00.54 -15 57.1 21 03.32 -15 45.2 5.152 4.275 +1.08 + 5.7 19.3 16.6/ 70 24.3 5.4 71/0.20 122 .56 20 21 11.35 -15 01.0 21 14.11 -14 48.5 5.226 4.294 +1.08 + 5.9 19.3 16.8/ 70 16.9 3.8 69/0.14 5 .01 30 21 22.17 -14 02.3 21 24.90 -13 49.4 5.282 4.314 +1.07 + 6.1 19.4 16.8/ 69 9.6 2.2 64/0.08 131 .89 Feb. 9 21 32.90 -13 01.6 21 35.61 -12 48.1 5.318 4.333 +1.06 + 6.3 19.4 16.7/ 68 2.6 0.6 37/0.02 98 .55 19 21 43.48 -11 59.0 21 46.17 -11 45.2 5.336 4.353 +1.03 + 6.4 19.4 16.5/ 67 5.4 1.2 268/0.04 24 .03 Mar. 1 21 53.82 -10 55.3 21 56.49 -10 41.1 5.334 4.373 +1.00 + 6.5 19.4 16.1/ 67 12.6 2.8 258/0.10 161 .93 11 22 03.85 -09 51.0 22 06.50 -09 36.3 5.313 4.392 +0.96 + 6.5 19.4 15.7/ 66 19.9 4.4 255/0.16 75 .54 21 22 13.50 -08 46.5 22 16.14 -08 31.5 5.274 4.412 +0.92 + 6.4 19.4 15.1/ 65 27.3 5.9 253/0.22 53 .05 31 22 22.70 -07 42.6 22 25.32 -07 27.3 5.218 4.432 +0.87 + 6.3 19.4 14.4/ 64 34.6 7.4 252/0.27 170 .95 Apr. 10 22 31.37 -06 39.7 22 33.98 -06 24.2 5.145 4.453 +0.81 + 6.1 19.4 13.5/ 63 42.1 8.7 251/0.32 51 .52 20 22 39.45 -05 38.6 22 42.05 -05 22.9 5.057 4.473 +0.74 + 5.9 19.4 12.5/ 62 49.6 9.9 250/0.37 84 .09 30 22 46.83 -04 40.0 22 49.42 -04 24.1 4.956 4.493 +0.66 + 5.6 19.4 11.3/ 61 57.3 10.9 250/0.42 142 .97 May 10 22 53.45 -03 44.5 22 56.03 -03 28.5 4.845 4.513 +0.57 + 5.2 19.3 10.0/ 59 65.1 11.7 249/0.46 24 .49 20 22 59.20 -02 52.9 23 01.77 -02 36.8 4.724 4.534 +0.48 + 4.7 19.3 8.6/ 57 73.1 12.3 248/0.50 117 .15 30 23 03.98 -02 06.0 23 06.55 -01 49.7 4.596 4.554 +0.37 + 4.2 19.3 7.0/ 53 81.3 12.7 248/0.53 114 .98 June 9 23 07.70 -01 24.4 23 10.26 -01 08.1 4.466 4.575 +0.26 + 3.5 19.2 5.2/ 47 89.7 12.8 247/0.55 7 .44 19 23 10.26 -00 49.0 23 12.82 -00 32.7 4.335 4.595 +0.13 + 2.8 19.2 3.5/ 35 98.4 12.6 246/0.55 152 .20 29 23 11.57 -00 20.6 23 14.13 -00 04.2 4.208 4.616 0.00 + 2.1 19.1 2.1/ 1 107.4 12.1 246/0.55 84 .99 July 9 23 11.59 +00 00.2 23 14.16 +00 16.6 4.089 4.636 -0.13 + 1.3 19.1 2.3/303 116.8 11.3 245/0.52 42 .37 19 23 10.30 +00 12.8 23 12.86 +00 29.1 3.981 4.657 -0.26 + 0.4 19.0 3.9/276 126.5 10.1 243/0.48 172 .26 29 23 07.75 +00 17.0 23 10.31 +00 33.3 3.889 4.678 -0.37 - 0.4 19.0 5.5/266 136.5 8.6 241/0.42 51 1.00 Aug. 8 23 04.06 +00 13.0 23 06.62 +00 29.2 3.817 4.698 -0.46 - 1.2 18.9 7.0/260 146.8 6.8 238/0.34 82 .29 18 22 59.44 +00 01.4 23 02.00 +00 17.5 3.769 4.719 -0.52 - 1.8 18.9 8.1/257 157.2 4.8 233/0.24 136 .30 28 22 54.20 -00 16.6 22 56.76 -00 00.5 3.749 4.739 -0.55 - 2.3 18.9 8.5/255 167.3 2.7 218/0.14 14 1.00 Sept. 7 22 48.70 -00 39.0 22 51.27 -00 23.1 3.757 4.760 -0.54 - 2.5 19.0 8.4/253 173.6 1.4 157/0.07 125 .21 17 22 43.35 -01 03.9 22 45.92 -00 48.1 3.795 4.780 -0.48 - 2.5 19.0 7.7/251 167.1 2.7 98/0.13 100 .33 27 22 38.52 -01 28.8 22 41.09 -01 13.1 3.863 4.801 -0.40 - 2.3 19.0 6.4/249 156.9 4.7 84/0.23 26 1.00 Oct. 7 22 34.55 -01 51.6 22 37.12 -01 36.0 3.958 4.821 -0.29 - 1.9 19.1 4.7/246 146.3 6.6 78/0.32 166 .15 17 22 31.67 -02 10.4 22 34.25 -01 54.8 4.077 4.842 -0.16 - 1.3 19.2 2.8/241 135.8 8.3 75/0.38 65 .34 27 22 30.06 -02 23.6 22 32.64 -02 08.1 4.217 4.862 -0.03 - 0.7 19.3 0.8/213 125.5 9.6 73/0.43 65 .99 Nov. 6 22 29.76 -02 30.4 22 32.34 -02 14.9 4.373 4.883 +0.10 0.0 19.4 1.5/ 89 115.5 10.6 71/0.46 154 .11 16 22 30.77 -02 30.2 22 33.35 -02 14.7 4.541 4.903 +0.23 + 0.7 19.5 3.5/ 78 105.8 11.2 70/0.47 33 .36 26 22 33.02 -02 22.8 22 35.60 -02 07.3 4.716 4.923 +0.34 + 1.4 19.6 5.3/ 74 96.3 11.5 69/0.47 102 .97 Dec. 6 22 36.42 -02 08.5 22 38.99 -01 52.8 4.894 4.943 +0.44 + 2.1 19.7 7.0/ 72 87.1 11.5 68/0.45 121 .09 16 22 40.84 -01 47.3 22 43.41 -01 31.6 5.071 4.963 +0.53 + 2.8 19.7 8.4/ 71 78.2 11.2 66/0.42 5 .38 26 22 46.15 -01 19.8 22 48.71 -01 04.0 5.243 4.983 +0.61 + 3.3 19.8 9.7/ 70 69.4 10.6 65/0.39 138 .94 2027 Jan. 5 22 52.21 -00 46.5 22 54.78 -00 30.5 5.407 5.003 +0.67 + 3.9 19.9 10.8/ 69 60.9 9.9 64/0.35 92 .07 15 22 58.92 -00 07.9 23 01.48 +00 08.2 5.560 5.023 +0.72 + 4.3 20.0 11.7/ 68 52.6 8.9 63/0.31 27 .41 25 23 06.14 +00 35.3 23 08.70 +00 51.6 5.698 5.043 +0.76 + 4.7 20.0 12.4/ 67 44.5 7.9 61/0.27 170 .91 Feb. 4 23 13.77 +01 22.6 23 16.33 +01 39.0 5.821 5.063 +0.79 + 5.1 20.1 12.9/ 67 36.5 6.6 59/0.22 66 .06 14 23 21.71 +02 13.4 23 24.27 +02 29.9 5.927 5.082 +0.81 + 5.4 20.2 13.3/ 66 28.7 5.3 56/0.18 57 .46 24 23 29.86 +03 06.9 23 32.41 +03 23.5 6.013 5.102 +0.83 + 5.6 20.2 13.6/ 66 21.0 4.0 51/0.13 160 .88 Mar. 6 23 38.13 +04 02.7 23 40.69 +04 19.4 6.079 5.121 +0.83 + 5.8 20.2 13.7/ 65 13.8 2.6 42/0.09 40 .05