C/2025 K4 (Siverd) Orbit by S. Nakano NK 5548 (2026) Observed in 2nd half of 2025
Equinox 2000.0 T/TT q (AU) e P Peri. Node Inc. Tail(AU) Epoch 2025 July 28.22581 2.5318635 0.9415920 285 326.91842 297.08187 38.54405 0.200 2026 June 9.0 m1 = 13.0 + 5 log Delta + 8.0 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 20 04.55 -13 26.7 20 07.33 -13 18.0 3.880 2.999 +1.47 +11.5 19.8 24.4/ 62 22.9 7.3 61/0.36 110 .84 2026 Jan. 10 20 19.29 -11 32.9 20 22.03 -11 23.3 3.977 3.054 +1.43 +11.7 19.9 24.1/ 61 17.5 5.6 51/0.27 113 .56 20 20 33.58 -09 36.9 20 36.28 -09 26.4 4.061 3.110 +1.38 +11.9 20.0 23.6/ 60 12.9 4.1 32/0.19 12 .01 30 20 47.37 -07 38.4 20 50.04 -07 27.2 4.133 3.169 +1.32 +12.1 20.1 23.1/ 59 10.4 3.2 2/0.15 135 .89 Feb. 9 21 00.62 -05 37.7 21 03.26 -05 25.8 4.190 3.229 +1.26 +12.3 20.2 22.6/ 57 11.4 3.5 327/0.16 93 .55 19 21 13.30 -03 34.9 21 15.91 -03 22.4 4.233 3.290 +1.20 +12.5 20.3 22.0/ 55 15.3 4.5 303/0.20 30 .03 Mar. 1 21 25.36 -01 30.1 21 27.93 -01 17.0 4.262 3.353 +1.14 +12.7 20.4 21.2/ 53 20.6 6.0 289/0.27 158 .93 11 21 36.74 +00 36.3 21 39.29 +00 49.9 4.277 3.417 +1.06 +12.8 20.4 20.5/ 51 26.5 7.4 281/0.33 74 .54 21 21 47.41 +02 44.1 21 49.94 +02 58.1 4.279 3.482 +0.99 +12.9 20.5 19.6/ 49 32.7 8.9 275/0.40 55 .05 31 21 57.29 +04 52.9 21 59.81 +05 07.3 4.268 3.548 +0.90 +13.0 20.6 18.7/ 46 39.1 10.2 270/0.46 161 .95 Apr. 10 22 06.33 +07 02.3 22 08.83 +07 17.1 4.244 3.615 +0.81 +13.0 20.6 17.7/ 43 45.6 11.4 266/0.51 53 .52 20 22 14.45 +09 11.9 22 16.93 +09 27.0 4.210 3.683 +0.71 +12.9 20.7 16.6/ 39 52.4 12.5 263/0.56 83 .09 30 22 21.55 +11 21.1 22 24.02 +11 36.3 4.166 3.752 +0.60 +12.8 20.7 15.5/ 34 59.2 13.3 260/0.61 140 .97 May 10 22 27.55 +13 29.1 22 30.01 +13 44.5 4.114 3.821 +0.48 +12.6 20.7 14.4/ 29 66.3 14.0 257/0.64 33 .49 20 22 32.33 +15 35.1 22 34.78 +15 50.6 4.057 3.891 +0.34 +12.3 20.8 13.2/ 22 73.4 14.4 254/0.67 113 .15 30 22 35.79 +17 37.9 22 38.22 +17 53.5 3.996 3.961 +0.20 +11.8 20.8 12.2/ 13 80.8 14.6 250/0.69 115 .98 June 9 22 37.81 +19 36.1 22 40.23 +19 51.8 3.934 4.032 +0.05 +11.2 20.8 11.2/ 3 88.2 14.6 246/0.70 25 .44 19 22 38.30 +21 28.0 22 40.71 +21 43.7 3.874 4.103 -0.11 +10.3 20.8 10.4/352 95.8 14.3 242/0.69 140 .20 29 22 37.21 +23 11.4 22 39.60 +23 27.0 3.819 4.175 -0.27 + 9.2 20.9 10.0/338 103.5 13.7 237/0.68 88 .99 July 9 22 34.52 +24 43.9 22 36.90 +24 59.5 3.772 4.247 -0.42 + 7.9 20.9 9.7/324 111.2 12.9 231/0.64 46 .37 19 22 30.32 +26 02.8 22 32.68 +26 18.3 3.737 4.319 -0.56 + 6.3 20.9 9.7/310 118.8 11.9 223/0.60 149 .26 29 22 24.79 +27 05.7 22 27.12 +27 21.0 3.718 4.391 -0.66 + 4.5 21.0 9.8/297 126.0 10.8 214/0.55 61 1.00 Aug. 8 22 18.24 +27 50.5 22 20.55 +28 05.6 3.716 4.464 -0.72 + 2.5 21.0 9.8/285 132.5 9.6 203/0.49 80 .29 18 22 11.07 +28 16.1 22 13.36 +28 31.0 3.736 4.537 -0.73 + 0.6 21.1 9.7/274 137.8 8.6 189/0.44 129 .30 28 22 03.78 +28 22.7 22 06.05 +28 37.3 3.779 4.610 -0.69 - 1.1 21.2 9.2/263 141.2 7.9 173/0.40 39 1.00 Sept. 7 21 56.85 +28 11.8 21 59.10 +28 26.2 3.845 4.682 -0.61 - 2.6 21.3 8.5/253 142.2 7.6 154/0.37 115 .21 17 21 50.73 +27 46.3 21 52.98 +28 00.5 3.936 4.755 -0.49 - 3.7 21.4 7.5/241 140.6 7.7 136/0.37 100 .33 27 21 45.79 +27 10.0 21 48.03 +27 23.9 4.050 4.828 -0.35 - 4.3 21.5 6.4/228 136.6 8.2 121/0.38 42 1.00 Oct. 7 21 42.24 +26 27.0 21 44.49 +26 40.8 4.186 4.902 -0.20 - 4.6 21.6 5.3/211 131.1 8.8 107/0.40 141 .15 17 21 40.21 +25 41.3 21 42.46 +25 55.0 4.342 4.975 -0.05 - 4.5 21.8 4.5/189 124.5 9.5 97/0.42 72 .34 27 21 39.70 +24 56.6 21 41.96 +25 10.3 4.514 5.048 +0.09 - 4.1 21.9 4.3/162 117.3 10.1 88/0.43 68 .99 Nov. 6 21 40.64 +24 15.8 21 42.91 +24 29.5 4.699 5.121 +0.23 - 3.5 22.0 4.7/138 109.8 10.5 81/0.43 139 .11 16 21 42.91 +23 41.0 21 45.20 +23 54.8 4.894 5.194 +0.35 - 2.7 22.2 5.5/119 102.2 10.7 75/0.42 47 .36 26 21 46.38 +23 13.9 21 48.68 +23 27.9 5.095 5.266 +0.45 - 1.8 22.3 6.5/106 94.6 10.8 69/0.41 99 .97 Dec. 6 21 50.88 +22 55.2 21 53.20 +23 09.4 5.300 5.339 +0.54 - 0.9 22.4 7.5/ 97 87.0 10.6 64/0.38 118 .09 16 21 56.27 +22 45.7 21 58.59 +23 00.0 5.504 5.412 +0.61 0.0 22.6 8.4/ 90 79.5 10.3 59/0.36 31 .38 26 22 02.37 +22 45.2 22 04.71 +22 59.8 5.704 5.485 +0.67 + 0.9 22.7 9.3/ 84 72.2 9.8 54/0.33 128 .94 2027 Jan. 5 22 09.06 +22 53.7 22 11.41 +23 08.6 5.898 5.557 +0.72 + 1.7 22.8 10.0/ 80 65.2 9.2 49/0.30 94 .07 15 22 16.21 +23 10.9 22 18.56 +23 25.9 6.083 5.630 +0.75 + 2.6 22.9 10.6/ 76 58.4 8.6 43/0.27 38 .41 25 22 23.68 +23 36.2 22 26.05 +23 51.5 6.257 5.702 +0.77 + 3.3 23.0 11.1/ 72 51.9 7.8 37/0.24 149 .91 Feb. 4 22 31.38 +24 09.1 22 33.76 +24 24.6 6.416 5.774 +0.78 + 4.0 23.1 11.4/ 69 45.9 7.0 29/0.21 70 .06 14 22 39.21 +24 48.9 22 41.59 +25 04.6 6.561 5.846 +0.79 + 4.6 23.2 11.6/ 66 40.5 6.3 20/0.19 60 .46 24 22 47.05 +25 35.0 22 49.45 +25 50.9 6.689 5.918 +0.78 + 5.2 23.3 11.7/ 63 36.0 5.6 10/0.17 148 .88 Mar. 6 22 54.85 +26 26.8 22 57.25 +26 42.9 6.800 5.990 +0.77 + 5.7 23.4 11.7/ 60 32.7 5.1 357/0.15 48 .05