メタデータ
| 項目 |
値 |
| Designation |
C/2005 O2 (Christensen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-09-08T10:41:22.672320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:51Z |
| Obs used |
126 |
| NEO |
- |
| M1 |
5.200 |
| K1 |
20.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2005-09-25.0000000 |
| e |
0.85937661 |
| q (au) |
3.333576 |
| a (au) |
23.705702 |
| i (deg) |
148.892051 |
| Ω (om, deg) |
280.771395 |
| ω (w, deg) |
263.833891 |
| M (ma, deg) |
0.141366 |
等級
散乱 + 全体線形
$$
M_a = (7.164 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.164 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
15:08:00.94 |
+11:39:17.4 |
HIP 73963 |
19.12 |
| 2026-06-01 12:00 |
15:07:57.08 |
+11:39:22.9 |
HIP 73963 |
18.28 |
| 2026-06-02 00:00 |
15:07:53.23 |
+11:39:28.1 |
HIP 73963 |
17.46 |
| 2026-06-02 12:00 |
15:07:49.40 |
+11:39:33.0 |
HIP 73963 |
16.66 |
| 2026-06-03 00:00 |
15:07:45.58 |
+11:39:37.6 |
HIP 73963 |
15.88 |
| 2026-06-03 12:00 |
15:07:41.78 |
+11:39:42.0 |
HIP 73963 |
15.13 |
| 2026-06-04 00:00 |
15:07:37.99 |
+11:39:46.1 |
HIP 73963 |
14.40 |
| 2026-06-04 12:00 |
15:07:34.21 |
+11:39:49.9 |
HIP 73963 |
13.70 |
| 2026-06-05 00:00 |
15:07:30.45 |
+11:39:53.5 |
HIP 73963 |
13.04 |
| 2026-06-05 12:00 |
15:07:26.70 |
+11:39:56.8 |
HIP 73963 |
12.41 |
| 2026-06-06 00:00 |
15:07:22.97 |
+11:39:59.8 |
HIP 73963 |
11.83 |
| 2026-06-06 12:00 |
15:07:19.25 |
+11:40:02.5 |
HIP 73963 |
11.30 |
| 2026-06-07 00:00 |
15:07:15.54 |
+11:40:05.0 |
HIP 73963 |
10.82 |
| 2026-06-07 12:00 |
15:07:11.86 |
+11:40:07.2 |
HIP 73963 |
10.41 |
| 2026-06-08 00:00 |
15:07:08.19 |
+11:40:09.1 |
HIP 73963 |
10.07 |
| 2026-06-08 12:00 |
15:07:04.53 |
+11:40:10.8 |
HIP 73963 |
9.80 |
| 2026-06-09 00:00 |
15:07:00.89 |
+11:40:12.2 |
HIP 73963 |
9.62 |
| 2026-06-09 12:00 |
15:06:57.27 |
+11:40:13.3 |
HIP 73963 |
9.52 |
| 2026-06-10 00:00 |
15:06:53.67 |
+11:40:14.1 |
HIP 73963 |
9.50 |
| 2026-06-10 12:00 |
15:06:50.08 |
+11:40:14.7 |
HIP 73963 |
9.58 |
| 2026-06-11 00:00 |
15:06:46.51 |
+11:40:15.0 |
HIP 73963 |
9.73 |
| 2026-06-11 12:00 |
15:06:42.95 |
+11:40:15.0 |
HIP 73963 |
9.96 |
| 2026-06-12 00:00 |
15:06:39.42 |
+11:40:14.8 |
HIP 73963 |
10.27 |
| 2026-06-12 12:00 |
15:06:35.90 |
+11:40:14.3 |
HIP 73963 |
10.63 |
| 2026-06-13 00:00 |
15:06:32.41 |
+11:40:13.5 |
HIP 73963 |
11.06 |
| 2026-06-13 12:00 |
15:06:28.93 |
+11:40:12.4 |
HIP 73963 |
11.53 |
| 2026-06-14 00:00 |
15:06:25.47 |
+11:40:11.1 |
HIP 73963 |
12.05 |
| 2026-06-14 12:00 |
15:06:22.03 |
+11:40:09.5 |
HIP 73849 |
12.10 |
| 2026-06-15 00:00 |
15:06:18.60 |
+11:40:07.7 |
HIP 73849 |
11.28 |
| 2026-06-15 12:00 |
15:06:15.20 |
+11:40:05.6 |
HIP 73849 |
10.45 |
| 2026-06-16 00:00 |
15:06:11.82 |
+11:40:03.2 |
HIP 73849 |
9.64 |
| 2026-06-16 12:00 |
15:06:08.46 |
+11:40:00.5 |
HIP 73849 |
8.83 |
| 2026-06-17 00:00 |
15:06:05.12 |
+11:39:57.6 |
HIP 73849 |
8.02 |
| 2026-06-17 12:00 |
15:06:01.80 |
+11:39:54.4 |
HIP 73849 |
7.23 |
| 2026-06-18 00:00 |
15:05:58.50 |
+11:39:50.9 |
HIP 73849 |
6.44 |
| 2026-06-18 12:00 |
15:05:55.22 |
+11:39:47.2 |
HIP 73849 |
5.66 |
| 2026-06-19 00:00 |
15:05:51.97 |
+11:39:43.3 |
HIP 73849 |
4.89 |
| 2026-06-19 12:00 |
15:05:48.73 |
+11:39:39.0 |
HIP 73849 |
4.13 |
| 2026-06-20 00:00 |
15:05:45.52 |
+11:39:34.5 |
HIP 73849 |
3.40 |
| 2026-06-20 12:00 |
15:05:42.33 |
+11:39:29.8 |
HIP 73849 |
2.70 |
| 2026-06-21 00:00 |
15:05:39.16 |
+11:39:24.8 |
HIP 73849 |
2.07 |
| 2026-06-21 12:00 |
15:05:36.01 |
+11:39:19.5 |
HIP 73849 |
1.57 |
| 2026-06-22 00:00 |
15:05:32.89 |
+11:39:14.0 |
HIP 73849 |
1.35 |