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 |
1.000 |
| 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) |
| 2026-05-12 00:00 |
15:10:42.69 |
+11:31:58.0 |
HIP 74253 |
8.88 |
| 2026-05-12 12:00 |
15:10:38.54 |
+11:32:14.1 |
HIP 74253 |
8.36 |
| 2026-05-13 00:00 |
15:10:34.40 |
+11:32:30.0 |
HIP 74253 |
7.95 |
| 2026-05-13 12:00 |
15:10:30.26 |
+11:32:45.7 |
HIP 74253 |
7.66 |
| 2026-05-14 00:00 |
15:10:26.12 |
+11:33:01.0 |
HIP 74253 |
7.51 |
| 2026-05-14 12:00 |
15:10:21.98 |
+11:33:16.1 |
HIP 74253 |
7.52 |
| 2026-05-15 00:00 |
15:10:17.85 |
+11:33:31.0 |
HIP 74253 |
7.67 |
| 2026-05-15 12:00 |
15:10:13.72 |
+11:33:45.6 |
HIP 74253 |
7.95 |
| 2026-05-16 00:00 |
15:10:09.59 |
+11:34:00.0 |
HIP 74253 |
8.37 |
| 2026-05-16 12:00 |
15:10:05.46 |
+11:34:14.0 |
HIP 74253 |
8.88 |
| 2026-05-17 00:00 |
15:10:01.34 |
+11:34:27.8 |
HIP 74253 |
9.49 |
| 2026-05-17 12:00 |
15:09:57.22 |
+11:34:41.4 |
HIP 74253 |
10.16 |
| 2026-05-18 00:00 |
15:09:53.11 |
+11:34:54.6 |
HIP 74253 |
10.90 |
| 2026-05-18 12:00 |
15:09:49.00 |
+11:35:07.7 |
HIP 74253 |
11.68 |
| 2026-05-19 00:00 |
15:09:44.90 |
+11:35:20.4 |
HIP 74253 |
12.49 |
| 2026-05-19 12:00 |
15:09:40.80 |
+11:35:32.9 |
HIP 74253 |
13.34 |
| 2026-05-20 00:00 |
15:09:36.71 |
+11:35:45.1 |
HIP 74253 |
14.21 |
| 2026-05-20 12:00 |
15:09:32.62 |
+11:35:57.1 |
HIP 74253 |
15.10 |
| 2026-05-21 00:00 |
15:09:28.54 |
+11:36:08.7 |
HIP 74253 |
16.00 |
| 2026-05-21 12:00 |
15:09:24.46 |
+11:36:20.1 |
HIP 74253 |
16.92 |
| 2026-05-22 00:00 |
15:09:20.40 |
+11:36:31.3 |
HIP 74253 |
17.84 |
| 2026-05-22 12:00 |
15:09:16.34 |
+11:36:42.2 |
HIP 74253 |
18.78 |
| 2026-05-23 00:00 |
15:09:12.28 |
+11:36:52.8 |
HIP 74253 |
19.72 |
| 2026-05-23 12:00 |
15:09:08.24 |
+11:37:03.1 |
HIP 74253 |
20.67 |
| 2026-05-24 00:00 |
15:09:04.20 |
+11:37:13.2 |
HIP 74253 |
21.62 |
| 2026-05-24 12:00 |
15:09:00.18 |
+11:37:23.0 |
HIP 74253 |
22.57 |
| 2026-05-25 00:00 |
15:08:56.16 |
+11:37:32.5 |
HIP 74253 |
23.52 |
| 2026-05-25 12:00 |
15:08:52.14 |
+11:37:41.7 |
HIP 74253 |
24.48 |
| 2026-05-26 00:00 |
15:08:48.14 |
+11:37:50.7 |
HIP 74253 |
25.44 |
| 2026-05-26 12:00 |
15:08:44.15 |
+11:37:59.4 |
HIP 74027 |
25.51 |
| 2026-05-27 00:00 |
15:08:40.17 |
+11:38:07.9 |
HIP 74027 |
24.81 |
| 2026-05-27 12:00 |
15:08:36.20 |
+11:38:16.1 |
HIP 74027 |
24.14 |
| 2026-05-28 00:00 |
15:08:32.23 |
+11:38:24.0 |
HIP 74027 |
23.50 |
| 2026-05-28 12:00 |
15:08:28.28 |
+11:38:31.6 |
HIP 74027 |
22.89 |
| 2026-05-29 00:00 |
15:08:24.34 |
+11:38:39.0 |
HIP 74027 |
22.31 |
| 2026-05-29 12:00 |
15:08:20.41 |
+11:38:46.0 |
HIP 74027 |
21.76 |
| 2026-05-30 00:00 |
15:08:16.49 |
+11:38:52.9 |
HIP 74027 |
21.24 |
| 2026-05-30 12:00 |
15:08:12.59 |
+11:38:59.4 |
HIP 74027 |
20.77 |
| 2026-05-31 00:00 |
15:08:08.69 |
+11:39:05.7 |
HIP 74027 |
20.33 |
| 2026-05-31 12:00 |
15:08:04.81 |
+11:39:11.7 |
HIP 74027 |
19.94 |
| 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 |