161P/Hartley-IRAS Orbit by S. Nakano NK 1184 (2005) Last obs. 2005 10 12 (A32)
Equinox 2000.0 T/TT q (AU) e P Peri. Node Inc. Tail(AU) Epoch 2026 Oct. 29.84114 1.2651229 0.8356255 21.4 47.08348 1.49435 95.78662 0.200 2025 May 5.0 m1 = 8.5 + 5 log Delta + 15.0 log r m2 = 14.0 + 5 log Delta + 5.0 log r + 0.03 phase Date/ 0h TT R.A.(1950) Decl. R.A.(2000) Decl. Delta r Variation Magnitude Mot./PA Elong. P PA/Tail Moon Age h m ¡ , h m ¡ , for T=+1 day m1 m2 , ¡ ¡ ¡ ¡ ¡ ¡ 2024 Dec. 26 06 20.56 -69 37.5 06 20.13 -69 38.9 6.320 6.345 +0.42 + 0.6 . 22.3 11.8/271 87.0 8.9 360/0.27 84 .23 2025 Jan. 5 05 57.97 -69 32.0 05 57.55 -69 31.9 6.256 6.283 +0.46 + 0.4 . 22.2 11.9/284 87.1 9.0 15/0.28 88 .28 15 05 36.39 -68 59.5 05 36.07 -68 57.8 6.197 6.221 +0.48 + 0.2 . 22.2 11.9/297 86.8 9.1 30/0.28 97 .99 25 05 17.34 -68 02.4 05 17.19 -67 59.3 6.144 6.158 +0.48 - 0.1 . 22.2 11.9/310 86.3 9.2 45/0.29 85 .22 Feb. 4 05 01.74 -66 45.1 05 01.80 -66 40.9 6.095 6.095 +0.47 - 0.3 . 22.1 11.7/321 85.4 9.3 58/0.29 88 .35 14 04 49.93 -65 13.0 04 50.20 -65 07.9 6.049 6.032 +0.46 - 0.5 . 22.1 11.5/332 84.3 9.4 71/0.30 98 .98 24 04 41.73 -63 31.1 04 42.19 -63 25.5 6.007 5.968 +0.44 - 0.7 . 22.1 11.2/342 83.0 9.5 83/0.30 85 .19 Mar. 6 04 36.77 -61 44.2 04 37.40 -61 38.3 5.967 5.903 +0.42 - 0.9 . 22.0 10.9/352 81.5 9.6 94/0.31 88 .42 16 04 34.57 -59 56.5 04 35.34 -59 50.4 5.928 5.838 +0.40 - 1.0 . 22.0 10.5/ 1 80.0 9.7 104/0.31 100 .97 26 04 34.67 -58 11.1 04 35.56 -58 05.1 5.888 5.772 +0.38 - 1.1 . 21.9 10.2/ 10 78.5 9.7 113/0.32 83 .16 Apr. 5 04 36.65 -56 30.8 04 37.64 -56 24.9 5.847 5.706 +0.37 - 1.2 . 21.9 9.8/ 19 77.0 9.8 123/0.32 90 .49 15 04 40.16 -54 57.9 04 41.23 -54 52.3 5.804 5.639 +0.36 - 1.3 . 21.9 9.4/ 27 75.6 9.9 132/0.33 101 .96 25 04 44.89 -53 34.1 04 46.03 -53 28.8 5.757 5.572 +0.35 - 1.3 . 21.8 9.0/ 36 74.5 10.0 140/0.33 80 .11 May 5 04 50.61 -52 20.8 04 51.80 -52 15.9 5.705 5.504 +0.34 - 1.3 . 21.8 8.6/ 45 73.5 10.1 149/0.34 92 .54 15 04 57.08 -51 19.4 04 58.30 -51 14.9 5.647 5.436 +0.33 - 1.4 . 21.7 8.3/ 55 72.9 10.2 157/0.35 101 .95 25 05 04.13 -50 30.5 05 05.38 -50 26.6 5.584 5.367 +0.32 - 1.4 . 21.7 8.0/ 65 72.5 10.4 166/0.36 78 .07 June 4 05 11.58 -49 55.3 05 12.85 -49 51.9 5.514 5.297 +0.32 - 1.4 . 21.6 7.8/ 75 72.5 10.5 174/0.37 96 .58 14 05 19.29 -49 34.4 05 20.57 -49 31.5 5.437 5.227 +0.32 - 1.3 . 21.6 7.6/ 87 72.8 10.7 182/0.38 98 .93 24 05 27.11 -49 28.2 05 28.38 -49 25.8 5.353 5.156 +0.31 - 1.3 . 21.5 7.6/ 98 73.4 10.9 190/0.39 77 .03 July 4 05 34.89 -49 37.4 05 36.15 -49 35.6 5.263 5.085 +0.31 - 1.2 . 21.5 7.7/110 74.4 11.1 198/0.40 98 .61 14 05 42.47 -50 02.2 05 43.71 -50 01.0 5.166 5.013 +0.31 - 1.2 . 21.4 8.0/122 75.7 11.3 206/0.42 94 .89 24 05 49.69 -50 43.0 05 50.89 -50 42.3 5.064 4.940 +0.31 - 1.1 . 21.3 8.5/133 77.2 11.6 214/0.44 80 .01 Aug. 3 05 56.33 -51 40.0 05 57.49 -51 39.8 4.958 4.867 +0.32 - 0.9 . 21.3 9.0/145 79.0 11.8 222/0.45 98 .64 13 06 02.16 -52 53.0 06 03.25 -52 53.2 4.848 4.793 +0.33 - 0.8 . 21.2 9.8/156 80.9 12.0 230/0.47 90 .84 23 06 06.87 -54 21.7 06 07.88 -54 22.2 4.735 4.719 +0.34 - 0.6 . 21.1 10.7/166 82.9 12.3 239/0.49 84 .00 Sept. 2 06 10.07 -56 05.4 06 10.97 -56 06.1 4.623 4.643 +0.35 - 0.4 . 21.0 11.7/176 84.9 12.5 247/0.51 95 .66 12 06 11.24 -58 02.4 06 12.02 -58 03.3 4.511 4.567 +0.38 - 0.2 . 21.0 12.9/186 86.8 12.7 257/0.54 89 .77 22 06 09.70 -60 10.8 06 10.32 -60 11.5 4.402 4.491 +0.41 0.0 . 20.9 14.1/195 88.6 12.9 267/0.56 88 .00 Oct. 2 06 04.50 -62 26.7 06 04.93 -62 27.0 4.297 4.413 +0.46 + 0.2 . 20.8 15.3/205 90.1 13.1 278/0.58 90 .70 12 05 54.47 -64 44.5 05 54.67 -64 44.1 4.199 4.335 +0.53 + 0.4 . 20.7 16.5/216 91.1 13.3 290/0.60 93 .69 22 05 38.13 -66 56.1 05 38.09 -66 54.5 4.109 4.256 +0.62 + 0.4 . 20.6 17.7/228 91.7 13.5 304/0.62 88 .00 Nov. 1 05 14.09 -68 49.8 05 13.83 -68 46.5 4.029 4.177 +0.74 + 0.4 . 20.5 18.7/241 91.6 13.7 319/0.65 84 .73 11 04 41.87 -70 10.7 04 41.53 -70 05.1 3.959 4.097 +0.88 0.0 . 20.5 19.6/257 90.9 14.0 337/0.67 101 .63 21 04 03.25 -70 43.3 04 03.04 -70 35.2 3.900 4.016 +0.99 - 0.6 . 20.4 20.3/273 89.5 14.2 356/0.69 83 .01 Dec. 1 03 22.88 -70 17.4 03 23.05 -70 06.8 3.853 3.934 +1.04 - 1.5 . 20.3 20.9/290 87.4 14.5 15/0.71 82 .78 11 02 46.35 -68 53.2 02 47.00 -68 40.8 3.816 3.851 +1.01 - 2.4 20.2 . 21.2/306 84.7 14.7 33/0.73 108 .59 21 02 17.18 -66 40.6 02 18.29 -66 26.8 3.788 3.768 +0.93 - 3.3 20.0 . 21.3/320 81.3 15.0 49/0.74 74 .01 31 01 56.13 -63 53.2 01 57.59 -63 38.6 3.769 3.683 +0.84 - 4.1 19.9 . 21.3/332 77.5 15.1 63/0.76 88 .84 2026 Jan. 10 01 42.18 -60 43.9 01 43.88 -60 28.9 3.755 3.598 +0.76 - 4.8 19.7 . 21.1/342 73.3 15.2 75/0.76 111 .56 20 01 33.84 -57 22.7 01 35.71 -57 07.4 3.744 3.513 +0.70 - 5.4 19.6 . 20.9/350 68.9 15.2 85/0.76 62 .01 30 01 29.78 -53 56.9 01 31.75 -53 41.5 3.735 3.426 +0.65 - 5.9 19.4 . 20.5/358 64.4 15.0 94/0.76 101 .89 Feb. 9 01 28.89 -50 31.5 01 30.94 -50 16.1 3.723 3.339 +0.61 - 6.3 19.2 . 20.2/ 4 59.9 14.8 103/0.75 107 .55 19 01 30.38 -47 10.0 01 32.47 -46 54.6 3.706 3.250 +0.58 - 6.7 19.0 . 19.8/ 10 55.5 14.5 112/0.74 52 .03 Mar. 1 01 33.64 -43 54.6 01 35.78 -43 39.3 3.682 3.161 +0.55 - 7.1 18.8 . 19.5/ 16 51.4 14.2 121/0.73 117 .93