31P/Schwassmann-Wachmann Orbit by S. Nakano NK 3791 (2019) Observed in 2nd half of 2025
Equinox 2000.0 T/TT q (AU) e P Peri. Node Inc. Tail(AU) Epoch 2028 Mar. 19.36719 3.4095329 0.1937214 8.70 18.06537 114.11114 4.54978 0.200 2026 June 9.0 m1 = 12.5 + 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 00 26.73 -02 06.6 00 29.28 -01 50.0 4.351 4.407 +0.44 + 3.8 20.5 7.6/ 60 86.8 12.9 67/0.56 46 .84 2026 Jan. 10 00 31.09 -01 28.4 00 33.65 -01 11.8 4.491 4.392 +0.55 + 4.4 20.6 9.3/ 62 77.9 12.6 68/0.54 171 .56 20 00 36.55 -00 44.1 00 39.11 -00 27.6 4.626 4.376 +0.64 + 4.9 20.6 10.8/ 63 69.3 12.1 68/0.50 56 .01 30 00 42.97 +00 05.3 00 45.53 +00 21.7 4.753 4.361 +0.73 + 5.3 20.7 12.1/ 64 61.0 11.4 69/0.46 80 .89 Feb. 9 00 50.22 +00 58.7 00 52.79 +01 15.0 4.869 4.345 +0.80 + 5.7 20.7 13.2/ 65 52.9 10.4 70/0.41 147 .55 19 00 58.20 +01 55.4 01 00.77 +02 11.6 4.972 4.330 +0.86 + 5.9 20.8 14.2/ 65 45.0 9.3 71/0.36 27 .03 Mar. 1 01 06.80 +02 54.4 01 09.38 +03 10.4 5.060 4.314 +0.91 + 6.0 20.8 14.9/ 66 37.3 8.0 73/0.30 112 .93 11 01 15.91 +03 54.9 01 18.50 +04 10.7 5.131 4.298 +0.96 + 6.1 20.8 15.5/ 67 29.9 6.6 75/0.25 123 .54 21 01 25.45 +04 56.2 01 28.05 +05 11.7 5.185 4.282 +0.99 + 6.1 20.8 16.0/ 67 22.6 5.1 77/0.19 8 .05 31 01 35.35 +05 57.5 01 37.96 +06 12.7 5.221 4.266 +1.02 + 6.0 20.8 16.3/ 68 15.5 3.6 82/0.13 140 .95 Apr. 10 01 45.52 +06 58.2 01 48.14 +07 13.1 5.238 4.250 +1.04 + 5.9 20.8 16.6/ 69 8.7 2.0 94/0.08 100 .52 20 01 55.90 +07 57.8 01 58.54 +08 12.3 5.236 4.234 +1.05 + 5.7 20.8 16.6/ 70 3.8 0.9 146/0.03 35 .09 30 02 06.43 +08 55.5 02 09.08 +09 09.7 5.215 4.218 +1.06 + 5.5 20.8 16.6/ 70 7.1 1.7 219/0.06 165 .97 May 10 02 17.02 +09 51.0 02 19.69 +10 04.8 5.177 4.202 +1.06 + 5.2 20.7 16.5/ 71 13.5 3.2 236/0.12 76 .49 20 02 27.63 +10 43.7 02 30.32 +10 57.0 5.120 4.185 +1.06 + 4.9 20.7 16.3/ 72 20.2 4.8 242/0.18 65 .15 30 02 38.17 +11 33.3 02 40.88 +11 46.1 5.046 4.169 +1.04 + 4.5 20.7 15.9/ 73 27.0 6.3 245/0.24 165 .98 June 9 02 48.57 +12 19.2 02 51.29 +12 31.5 4.957 4.152 +1.02 + 4.2 20.6 15.5/ 74 33.9 7.8 247/0.30 50 .44 19 02 58.74 +13 01.2 03 01.49 +13 13.0 4.851 4.136 +0.99 + 3.7 20.6 14.9/ 75 40.8 9.2 249/0.36 94 .20 29 03 08.59 +13 39.0 03 11.36 +13 50.3 4.732 4.119 +0.94 + 3.3 20.5 14.1/ 76 47.8 10.5 251/0.43 142 .99 July 9 03 18.02 +14 12.2 03 20.80 +14 23.0 4.601 4.103 +0.89 + 2.8 20.4 13.2/ 77 55.0 11.7 252/0.48 22 .37 19 03 26.91 +14 40.8 03 29.71 +14 51.0 4.459 4.086 +0.82 + 2.3 20.3 12.1/ 79 62.3 12.7 254/0.54 123 .26 29 03 35.12 +15 04.4 03 37.93 +15 14.2 4.307 4.070 +0.74 + 1.8 20.2 10.9/ 80 69.8 13.5 255/0.60 117 1.00 Aug. 8 03 42.52 +15 23.1 03 45.34 +15 32.4 4.150 4.053 +0.64 + 1.3 20.1 9.4/ 82 77.5 14.1 256/0.64 16 .29 18 03 48.93 +15 36.6 03 51.75 +15 45.6 3.987 4.037 +0.53 + 0.8 20.0 7.6/ 84 85.6 14.5 257/0.69 150 .30 28 03 54.17 +15 45.1 03 57.00 +15 53.7 3.823 4.020 +0.39 + 0.3 19.9 5.7/ 87 93.9 14.5 259/0.71 88 1.00 Sept. 7 03 58.08 +15 48.5 04 00.92 +15 56.9 3.661 4.004 +0.24 - 0.2 19.8 3.5/ 93 102.6 14.2 260/0.73 49 .21 17 04 00.49 +15 47.0 04 03.32 +15 55.3 3.504 3.988 +0.08 - 0.6 19.7 1.3/120 111.7 13.5 261/0.73 170 .33 27 04 01.24 +15 40.8 04 04.07 +15 49.0 3.357 3.971 -0.10 - 1.1 19.6 1.8/233 121.3 12.5 262/0.70 55 1.00 Oct. 7 04 00.26 +15 30.1 04 03.09 +15 38.4 3.222 3.955 -0.27 - 1.4 19.5 4.2/250 131.3 10.9 263/0.64 86 .15 17 03 57.54 +15 15.5 04 00.36 +15 23.9 3.106 3.938 -0.43 - 1.7 19.4 6.5/255 141.8 9.0 265/0.54 145 .34 27 03 53.22 +14 57.8 03 56.04 +15 06.5 3.012 3.922 -0.56 - 1.9 19.3 8.4/257 152.7 6.7 268/0.41 19 .99 Nov. 6 03 47.60 +14 38.2 03 50.41 +14 47.2 2.944 3.906 -0.65 - 2.0 19.3 9.6/258 163.7 4.1 276/0.26 125 .11 16 03 41.12 +14 18.1 03 43.91 +14 27.6 2.905 3.890 -0.68 - 1.8 19.2 10.0/260 173.6 1.6 311/0.10 110 .36 26 03 34.34 +13 59.7 03 37.13 +14 09.5 2.897 3.874 -0.65 - 1.5 19.2 9.5/261 170.5 2.4 44/0.16 29 .97 Dec. 6 03 27.89 +13 44.7 03 30.67 +13 54.9 2.919 3.858 -0.56 - 0.9 19.2 8.2/264 159.7 5.1 62/0.33 163 .09 16 03 22.33 +13 35.2 03 25.10 +13 45.7 2.969 3.842 -0.42 - 0.2 19.2 6.1/268 148.5 7.7 68/0.49 73 .38 26 03 18.13 +13 32.5 03 20.90 +13 43.3 3.044 3.827 -0.25 + 0.5 19.3 3.7/278 137.4 10.0 70/0.62 70 .94 2027 Jan. 5 03 15.59 +13 37.4 03 18.36 +13 48.3 3.141 3.811 -0.07 + 1.3 19.3 1.6/320 126.7 11.9 72/0.71 156 .07 15 03 14.87 +13 49.9 03 17.64 +14 00.8 3.254 3.796 +0.11 + 2.0 19.4 2.6/ 40 116.5 13.4 73/0.77 38 .41 25 03 15.99 +14 09.6 03 18.77 +14 20.5 3.379 3.780 +0.29 + 2.6 19.5 4.9/ 58 106.7 14.4 74/0.80 108 .91 Feb. 4 03 18.88 +14 35.7 03 21.67 +14 46.5 3.511 3.765 +0.46 + 3.1 19.5 7.3/ 65 97.3 15.1 75/0.80 126 .06 14 03 23.43 +15 07.1 03 26.23 +15 17.6 3.646 3.750 +0.61 + 3.5 19.6 9.5/ 68 88.4 15.3 76/0.79 9 .46 24 03 29.50 +15 42.5 03 32.31 +15 52.7 3.780 3.735 +0.74 + 3.8 19.7 11.4/ 70 79.9 15.1 77/0.75 140 .88 Mar. 6 03 36.91 +16 20.8 03 39.74 +16 30.5 3.910 3.721 +0.86 + 3.9 19.7 13.0/ 72 71.7 14.7 78/0.71 99 .05