C/2021 O1 (Nishimura) Orbit by S. Nakano unpublished (2021) Observed in 2nd half of 2021
Equinox 2000.0 T/TT q (AU) e P Peri. Node Inc. Tail(AU) 2021 Aug. 13.9299 0.786958 1.0 74.4540 41.6078 27.5729 0.200 m1 = 9.0 + 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 , ¡ ¡ ¡ ¡ ¡ ¡ 2022 Jan. 1 15 50.57 -21 56.8 15 53.52 -22 05.6 3.101 2.422 +1.25 - 8.6 15.3 19.3/117 39.3 14.9 280/0.90 14 .05 11 16 03.01 -23 23.6 16 06.00 -23 31.7 3.126 2.550 +1.09 - 7.8 15.5 16.9/118 46.5 16.2 278/0.97 150 .62 21 16 13.92 -24 42.8 16 16.94 -24 50.1 3.134 2.676 +0.93 - 7.3 15.8 14.5/121 54.0 17.3 277/1.02 92 .91 31 16 23.17 -25 56.0 16 26.22 -26 02.7 3.126 2.800 +0.74 - 6.8 15.9 12.1/125 61.9 18.1 277/1.07 45 .02 Feb. 10 16 30.57 -27 04.5 16 33.66 -27 10.8 3.106 2.922 +0.54 - 6.5 16.1 9.7/132 70.2 18.5 277/1.10 174 .63 20 16 35.94 -28 09.4 16 39.06 -28 15.3 3.074 3.043 +0.32 - 6.2 16.3 7.5/146 78.9 18.6 277/1.12 62 .88 Mar. 2 16 39.10 -29 11.3 16 42.25 -29 17.0 3.036 3.163 +0.08 - 5.9 16.4 6.0/170 88.1 18.3 277/1.11 78 .01 12 16 39.85 -30 10.1 16 43.02 -30 15.7 2.996 3.280 -0.18 - 5.5 16.5 6.0/202 97.7 17.5 279/1.08 155 .64 22 16 38.05 -31 05.2 16 41.25 -31 11.0 2.957 3.397 -0.43 - 5.0 16.7 7.5/228 107.8 16.2 281/1.02 26 .84 Apr. 1 16 33.69 -31 55.2 16 36.90 -32 01.2 2.927 3.512 -0.68 - 4.3 16.8 9.7/243 118.3 14.5 284/0.92 114 .00 11 16 26.86 -32 37.7 16 30.08 -32 44.2 2.910 3.625 -0.90 - 3.3 16.9 11.7/253 129.1 12.4 288/0.79 121 .66 21 16 17.90 -33 10.4 16 21.12 -33 17.5 2.912 3.738 -1.05 - 2.1 17.0 13.4/260 140.0 9.9 294/0.64 20 .77 May 1 16 07.37 -33 31.1 16 10.58 -33 38.9 2.938 3.849 -1.14 - 0.8 17.2 14.2/266 150.8 7.3 304/0.47 152 .00 11 15 56.00 -33 38.6 15 59.20 -33 47.1 2.993 3.959 -1.14 + 0.4 17.4 14.2/271 160.6 4.9 323/0.30 83 .69 21 15 44.64 -33 33.5 15 47.82 -33 42.7 3.078 4.068 -1.06 + 1.5 17.5 13.3/276 166.4 3.4 2/0.21 64 .70 31 15 34.05 -33 18.0 15 37.20 -33 27.9 3.194 4.176 -0.92 + 2.2 17.7 11.8/280 163.5 4.0 49/0.23 161 .00 June 10 15 24.86 -32 55.5 15 27.99 -33 05.9 3.340 4.282 -0.74 + 2.5 17.9 9.7/285 155.1 5.7 73/0.32 43 .74 20 15 17.47 -32 29.7 15 20.57 -32 40.5 3.514 4.388 -0.54 + 2.6 18.2 7.4/290 145.3 7.6 84/0.41 106 .62 30 15 12.04 -32 03.8 15 15.12 -32 14.9 3.712 4.493 -0.35 + 2.3 18.4 5.0/297 135.4 9.1 91/0.47 127 .01 July 10 15 08.59 -31 40.7 15 11.66 -31 52.0 3.931 4.597 -0.16 + 1.9 18.6 2.8/313 125.5 10.4 96/0.50 13 .80 20 15 07.01 -31 22.0 15 10.07 -31 33.3 4.165 4.699 +0.01 + 1.3 18.8 1.4/ 6 116.0 11.2 99/0.51 143 .56 30 15 07.14 -31 08.5 15 10.19 -31 19.9 4.410 4.801 +0.16 + 0.8 19.0 2.2/ 70 106.7 11.7 102/0.50 94 .02 Aug. 9 15 08.77 -31 00.7 15 11.83 -31 12.0 4.662 4.902 +0.30 + 0.2 19.2 3.8/ 87 97.7 11.8 104/0.48 40 .86 19 15 11.72 -30 58.5 15 14.78 -31 09.6 4.918 5.003 +0.41 - 0.3 19.5 5.2/ 93 88.9 11.7 106/0.45 168 .52 29 15 15.80 -31 01.3 15 18.87 -31 12.2 5.173 5.102 +0.51 - 0.7 19.6 6.5/ 97 80.4 11.3 107/0.42 63 .03 Sept. 8 15 20.83 -31 08.8 15 23.92 -31 19.4 5.423 5.201 +0.59 - 1.1 19.8 7.6/ 99 72.0 10.6 109/0.38 75 .92 18 15 26.67 -31 20.3 15 29.77 -31 30.5 5.666 5.299 +0.65 - 1.4 20.0 8.5/100 63.8 9.8 110/0.33 151 .49 28 15 33.18 -31 35.1 15 36.30 -31 45.0 5.897 5.396 +0.71 - 1.7 20.2 9.2/101 55.7 8.8 112/0.29 32 .05 Oct. 8 15 40.23 -31 52.7 15 43.37 -32 02.2 6.115 5.492 +0.75 - 1.9 20.3 9.7/102 47.7 7.7 114/0.24 108 .96 18 15 47.70 -32 12.6 15 50.86 -32 21.6 6.317 5.588 +0.78 - 2.1 20.5 10.1/103 39.8 6.6 117/0.20 125 .47 28 15 55.49 -32 34.2 15 58.66 -32 42.8 6.500 5.683 +0.80 - 2.3 20.6 10.3/103 32.1 5.3 122/0.16 10 .08 Nov. 7 16 03.48 -32 57.3 16 06.68 -33 05.3 6.663 5.777 +0.81 - 2.4 20.7 10.4/104 24.7 4.1 129/0.12 139 .98 17 16 11.58 -33 21.4 16 14.80 -33 28.9 6.803 5.871 +0.81 - 2.4 20.9 10.4/104 18.0 3.0 141/0.09 100 .46 27 16 19.68 -33 46.2 16 22.92 -33 53.2 6.921 5.964 +0.80 - 2.5 21.0 10.3/105 13.2 2.2 166/0.06 37 .13 Dec. 7 16 27.67 -34 11.7 16 30.93 -34 18.2 7.014 6.057 +0.78 - 2.5 21.1 10.0/105 12.7 2.1 204/0.06 165 .99 17 16 35.45 -34 37.7 16 38.74 -34 43.6 7.083 6.149 +0.75 - 2.6 21.1 9.6/106 17.0 2.7 232/0.07 72 .44 27 16 42.92 -35 04.1 16 46.23 -35 09.5 7.127 6.240 +0.71 - 2.6 21.2 9.0/108 23.8 3.6 247/0.10 70 .18 2023 Jan. 6 16 49.96 -35 31.0 16 53.28 -35 35.9 7.149 6.331 +0.65 - 2.7 21.3 8.4/109 31.5 4.6 255/0.13 160 .99 16 16 56.44 -35 58.3 16 59.78 -36 02.8 7.148 6.421 +0.58 - 2.8 21.3 7.6/112 39.6 5.6 260/0.15 43 .41 26 17 02.26 -36 26.3 17 05.62 -36 30.3 7.126 6.511 +0.50 - 2.8 21.4 6.7/115 48.1 6.5 263/0.18 103 .23 Feb. 5 17 07.30 -36 54.8 17 10.67 -36 58.4 7.087 6.600 +0.41 - 2.9 21.4 5.7/120 56.9 7.2 266/0.20 133 .99 15 17 11.42 -37 23.8 17 14.82 -37 27.2 7.033 6.688 +0.31 - 2.9 21.5 4.7/129 65.8 7.7 268/0.21 14 .36 25 17 14.53 -37 53.3 17 17.95 -37 56.5 6.967 6.776 +0.20 - 3.0 21.5 3.8/142 74.9 8.1 270/0.23 135 .27 Mar. 7 17 16.52 -38 23.1 17 19.95 -38 26.1 6.894 6.864 +0.08 - 3.0 21.6 3.1/163 84.2 8.3 273/0.23 103 1.00 17 17 17.29 -38 52.7 17 20.74 -38 55.7 6.818 6.951 -0.05 - 2.9 21.6 2.9/191 93.6 8.2 275/0.23 30 .29 27 17 16.79 -39 21.5 17 20.25 -39 24.5 6.743 7.038 -0.18 - 2.7 21.6 3.4/217 103.2 7.9 278/0.23 164 .30 Apr. 6 17 15.00 -39 48.7 17 18.48 -39 51.9 6.676 7.124 -0.30 - 2.5 21.6 4.3/234 112.9 7.4 282/0.22 70 1.00 16 17 11.96 -40 13.3 17 15.44 -40 16.7 6.620 7.210 -0.42 - 2.1 21.7 5.2/246 122.6 6.7 286/0.20 69 .22 26 17 07.74 -40 34.3 17 11.24 -40 37.9 6.580 7.295 -0.52 - 1.6 21.7 6.1/254 132.3 5.9 292/0.17 153 .32 May 6 17 02.53 -40 50.4 17 06.03 -40 54.4 6.562 7.380 -0.60 - 1.1 21.8 6.8/260 141.7 4.9 300/0.14 35 1.00 16 16 56.56 -41 00.8 17 00.06 -41 05.2 6.568 7.464 -0.64 - 0.5 21.8 7.3/266 150.5 3.8 312/0.11 109 .15