261P/Larson Orbit by S. Nakano NK 4032 (2020) : T is corrected by -0.01 day.
Equinox 2000.0 T/TT q (AU) e P Peri. Node Inc. Tail(AU) Epoch 2025 Dec. 27.41942 2.0142442 0.4225734 6.52 67.37100 291.04989 6.07344 0.200 2026 June 9.0 m1 = 11.5 + 5 log Delta + 10.0 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 22 20.12 -05 14.2 22 22.73 -04 59.0 2.381 2.014 +2.08 +12.1 16.4 33.4/ 69 56.6 24.0 66/1.82 75 .84 2026 Jan. 10 22 40.95 -03 13.4 22 43.53 -02 57.7 2.468 2.017 +2.11 +12.7 16.5 34.0/ 68 52.0 22.6 64/1.66 149 .56 20 23 02.03 -01 06.7 23 04.60 -00 50.5 2.552 2.023 +2.13 +13.1 16.6 34.5/ 68 47.5 21.0 63/1.50 34 .01 30 23 23.29 +01 04.3 23 25.85 +01 20.8 2.635 2.031 +2.14 +13.4 16.7 34.7/ 67 43.2 19.4 62/1.35 97 .89 Feb. 9 23 44.67 +03 17.8 23 47.23 +03 34.5 2.715 2.043 +2.15 +13.4 16.8 34.8/ 67 38.8 17.6 61/1.19 135 .55 19 00 06.15 +05 32.3 00 08.72 +05 49.0 2.793 2.058 +2.16 +13.4 16.9 34.8/ 67 34.6 15.8 60/1.05 16 .03 Mar. 1 00 27.71 +07 45.9 00 30.30 +08 02.5 2.868 2.075 +2.16 +13.1 17.0 34.6/ 67 30.4 14.0 59/0.90 118 .93 11 00 49.33 +09 57.0 00 51.94 +10 13.3 2.940 2.095 +2.17 +12.7 17.1 34.4/ 68 26.2 12.1 58/0.77 120 .54 21 01 11.02 +12 04.1 01 13.65 +12 20.0 3.007 2.117 +2.18 +12.1 17.1 34.0/ 69 22.0 10.2 57/0.63 4 .05 31 01 32.75 +14 05.6 01 35.42 +14 20.9 3.070 2.142 +2.18 +11.4 17.2 33.5/ 69 17.9 8.2 56/0.50 138 .95 Apr. 10 01 54.51 +16 00.3 01 57.23 +16 14.9 3.128 2.169 +2.18 +10.6 17.3 33.0/ 71 13.8 6.3 53/0.38 106 .52 20 02 16.29 +17 47.1 02 19.05 +18 00.9 3.181 2.197 +2.18 + 9.7 17.4 32.4/ 72 9.7 4.4 47/0.26 26 .09 30 02 38.05 +19 24.9 02 40.87 +19 37.8 3.227 2.228 +2.18 + 8.7 17.5 31.8/ 73 5.9 2.7 33/0.16 156 .97 May 10 02 59.75 +20 53.1 03 02.62 +21 04.8 3.267 2.261 +2.16 + 7.7 17.6 31.1/ 75 3.7 1.7 347/0.10 89 .49 20 03 21.35 +22 10.9 03 24.27 +22 21.5 3.299 2.295 +2.15 + 6.6 17.7 30.4/ 76 5.6 2.5 296/0.14 49 .15 30 03 42.77 +23 18.1 03 45.73 +23 27.4 3.324 2.330 +2.12 + 5.5 17.8 29.6/ 78 9.5 4.1 279/0.23 174 .98 June 9 04 03.94 +24 14.4 04 06.94 +24 22.4 3.340 2.367 +2.09 + 4.4 17.9 28.8/ 80 13.9 5.9 273/0.33 69 .44 19 04 24.77 +24 59.9 04 27.81 +25 06.5 3.346 2.404 +2.04 + 3.4 17.9 27.9/ 82 18.5 7.7 271/0.43 72 .20 29 04 45.16 +25 34.8 04 48.23 +25 40.0 3.344 2.443 +1.99 + 2.3 18.0 26.9/ 84 23.3 9.5 270/0.53 168 .99 July 9 05 05.01 +25 59.5 05 08.10 +26 03.4 3.331 2.483 +1.92 + 1.4 18.1 25.9/ 86 28.3 11.2 271/0.63 47 .37 19 05 24.22 +26 14.8 05 27.32 +26 17.2 3.308 2.523 +1.84 + 0.5 18.1 24.8/ 88 33.5 12.8 271/0.73 94 .26 29 05 42.66 +26 21.3 05 45.77 +26 22.4 3.275 2.564 +1.76 - 0.3 18.2 23.6/ 90 38.8 14.4 272/0.82 148 1.00 Aug. 8 06 00.22 +26 20.0 06 03.33 +26 19.8 3.231 2.606 +1.66 - 0.9 18.2 22.3/ 91 44.4 15.8 273/0.91 21 .29 18 06 16.78 +26 12.0 06 19.88 +26 10.7 3.177 2.647 +1.54 - 1.5 18.2 20.8/ 93 50.3 17.1 274/1.00 116 .30 28 06 32.19 +25 58.6 06 35.29 +25 56.2 3.113 2.690 +1.41 - 1.9 18.3 19.2/ 95 56.5 18.2 275/1.09 126 1.00 Sept. 7 06 46.33 +25 41.1 06 49.42 +25 37.6 3.039 2.732 +1.27 - 2.1 18.3 17.3/ 96 62.9 19.2 276/1.17 8 .21 17 06 59.04 +25 20.8 07 02.11 +25 16.4 2.958 2.775 +1.11 - 2.2 18.3 15.2/ 98 69.8 19.9 277/1.24 139 .33 27 07 10.12 +24 59.3 07 13.18 +24 54.2 2.869 2.818 +0.93 - 2.2 18.3 12.8/ 99 77.0 20.3 278/1.30 99 1.00 Oct. 7 07 19.42 +24 38.1 07 22.46 +24 32.3 2.775 2.861 +0.73 - 2.0 18.3 10.1/101 84.7 20.4 278/1.35 39 .15 17 07 26.70 +24 18.6 07 29.73 +24 12.3 2.678 2.904 +0.50 - 1.7 18.3 7.1/103 92.9 20.1 279/1.37 165 .34 27 07 31.75 +24 02.1 07 34.77 +23 55.5 2.581 2.947 +0.26 - 1.3 18.3 3.8/109 101.6 19.3 279/1.37 67 .99 Nov. 6 07 34.37 +23 49.6 07 37.38 +23 42.9 2.487 2.989 0.00 - 0.8 18.2 0.8/179 111.0 18.0 279/1.33 73 .11 16 07 34.38 +23 41.8 07 37.39 +23 35.0 2.401 3.032 -0.26 - 0.3 18.2 3.6/265 121.0 16.2 278/1.24 165 .36 26 07 31.75 +23 38.4 07 34.76 +23 31.8 2.328 3.075 -0.52 + 0.1 18.2 7.1/271 131.7 13.9 278/1.09 29 .97 Dec. 6 07 26.58 +23 38.6 07 29.60 +23 32.3 2.273 3.117 -0.73 + 0.3 18.2 10.1/272 143.0 11.0 277/0.89 109 .09 16 07 19.23 +23 40.8 07 22.25 +23 35.0 2.240 3.159 -0.89 + 0.3 18.2 12.2/272 154.8 7.6 275/0.63 129 .38 26 07 10.36 +23 42.9 07 13.39 +23 37.8 2.235 3.201 -0.95 + 0.1 18.3 13.1/271 167.0 4.0 272/0.33 15 .94 2027 Jan. 5 07 00.82 +23 43.2 07 03.85 +23 38.8 2.259 3.242 -0.93 - 0.2 18.4 12.7/270 178.8 0.4 224/0.03 148 .07 15 06 51.56 +23 40.8 06 54.60 +23 36.9 2.314 3.283 -0.81 - 0.5 18.5 11.1/268 168.2 3.5 99/0.27 89 .41 25 06 43.49 +23 35.3 06 46.53 +23 32.1 2.399 3.324 -0.63 - 0.7 18.6 8.6/265 156.3 6.8 96/0.52 58 .91 Feb. 4 06 37.24 +23 27.6 06 40.28 +23 24.8 2.512 3.364 -0.40 - 0.9 18.8 5.6/261 144.7 9.8 94/0.71 173 .06 14 06 33.20 +23 18.3 06 36.23 +23 15.8 2.647 3.404 -0.17 - 1.0 18.9 2.6/247 133.6 12.1 94/0.84 48 .46 24 06 31.49 +23 08.3 06 34.52 +23 05.9 2.802 3.444 +0.05 - 1.1 19.1 1.3/145 123.2 13.9 93/0.91 97 .88 Mar. 6 06 32.02 +22 57.8 06 35.05 +22 55.4 2.970 3.483 +0.26 - 1.1 19.3 3.8/107 113.3 15.2 93/0.94 140 .05