和预报基本一致，29日的最大亮度应能达到1.5等，到3月份它在西南低空出现时，亮度将下降到8等。
轨道根数：
过近日点时刻 T 2003 Jan. 29.0034 TT
近日距q 0.190047 (2000.0)
近日点角距 Peri. 187.5659
升交点黄经 Node 119.0686
轨道偏心率e 1.0 轨道倾角 Incl. 94.1519
From 337 observations 2002 Dec. 14-2003 Jan. 16.
星历表 Ephemeris:
C/2002 X5
Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 m2
2003 01 25 20 18.32 -10 16.4 1.161 0.245 9.1 39.6 2.7
2003 01 27 20 28.00 -14 49.3 1.174 0.206 4.2 20.8 2.0
2003 01 29 20 38.87 -19 40.6 1.171 0.190 2.0 10.5 1.6
2003 01 31 20 51.46 -24 22.9 1.147 0.205 6.8 34.7 1.9
2003 02 02 21 05.88 -28 31.0 1.109 0.244 11.6 54.0 2.6
2003 02 04 21 22.16 -32 01.8 1.066 0.295 15.9 66.3 3.3
2003 02 06 21 40.42 -35 00.8 1.025 0.350 19.9 73.8 4.0
2003 02 08 22 00.77 -37 32.7 0.986 0.405 23.7 78.2 4.5
2003 02 10 22 23.31 -39 38.8 0.952 0.461 27.4 80.5 5.0
2003 02 12 22 47.98 -41 18.7 0.923 0.515 31.1 81.3 5.4
2003 02 14 23 14.55 -42 30.2 0.899 0.568 34.7 81.2 5.8
2003 02 16 23 42.56 -43 11.3 0.881 0.621 38.2 80.2 6.2
2003 02 18 00 11.36 -43 20.5 0.869 0.671 41.8 78.6 6.5
2003 02 20 00 40.16 -42 57.9 0.863 0.721 45.2 76.7 6.8
2003 02 22 01 08.19 -42 05.6 0.863 0.770 48.5 74.3 7.0
2003 02 24 01 34.81 -40 47.3 0.868 0.817 51.7 71.8 7.3
2003 02 26 01 59.57 -39 08.2 0.879 0.864 54.7 69.2 7.6
2003 02 28 02 22.24 -37 13.7 0.895 0.910 57.4 66.6 7.8
2003 03 02 02 42.77 -35 09.2 0.916 0.955 59.9 63.9 8.1
2003 03 04 03 01.26 -32 59.3 0.942 0.999 62.2 61.4 8.4
2003 03 06 03 17.86 -30 48.0 0.972 1.042 64.1 58.9 8.6
2003 03 08 03 32.76 -28 38.1 1.005 1.085 65.8 56.5 8.9
2003 03 10 03 46.16 -26 31.8 1.042 1.127 67.2 54.3 9.1
2003 03 12 03 58.25 -24 30.5 1.082 1.169 68.4 52.2 9.3
2003 03 14 04 09.21 -22 35.0 1.124 1.210 69.3 50.3 9.6
2003 03 16 04 19.19 -20 45.8 1.168 1.250 70.1 48.4 9.8
2003 03 18 04 28.31 -19 03.0 1.215 1.290 70.6 46.7 10.0
2003 03 20 04 36.69 -17 26.7 1.263 1.329 71.0 45.1 10.2
取自 M.P.E.C. 2003-B22 （Brian G. Marsden）