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) |
| 2026-07-29 00:00 |
15:02:55.24 |
+11:21:52.9 |
HIP 73691 |
22.75 |
| 2026-07-29 12:00 |
15:02:54.22 |
+11:21:31.6 |
HIP 73691 |
23.18 |
| 2026-07-30 00:00 |
15:02:53.22 |
+11:21:10.2 |
HIP 73691 |
23.61 |
| 2026-07-30 12:00 |
15:02:52.26 |
+11:20:48.6 |
HIP 73691 |
24.04 |
| 2026-07-31 00:00 |
15:02:51.33 |
+11:20:26.9 |
HIP 73691 |
24.47 |
| 2026-07-31 12:00 |
15:02:50.43 |
+11:20:05.0 |
HIP 73691 |
24.90 |
| 2026-08-01 00:00 |
15:02:49.56 |
+11:19:43.0 |
HIP 73691 |
25.32 |
| 2026-08-01 12:00 |
15:02:48.72 |
+11:19:20.8 |
HIP 73691 |
25.74 |
| 2026-08-02 00:00 |
15:02:47.92 |
+11:18:58.5 |
HIP 73691 |
26.16 |
| 2026-08-02 12:00 |
15:02:47.14 |
+11:18:36.1 |
HIP 73691 |
26.58 |
| 2026-08-03 00:00 |
15:02:46.40 |
+11:18:13.5 |
HIP 73691 |
27.00 |
| 2026-08-03 12:00 |
15:02:45.69 |
+11:17:50.8 |
HIP 73691 |
27.41 |
| 2026-08-04 00:00 |
15:02:45.00 |
+11:17:27.9 |
HIP 73691 |
27.82 |
| 2026-08-04 12:00 |
15:02:44.36 |
+11:17:04.9 |
HIP 73691 |
28.23 |
| 2026-08-05 00:00 |
15:02:43.74 |
+11:16:41.8 |
HIP 73691 |
28.64 |
| 2026-08-05 12:00 |
15:02:43.15 |
+11:16:18.6 |
HIP 73691 |
29.04 |
| 2026-08-06 00:00 |
15:02:42.60 |
+11:15:55.2 |
HIP 73691 |
29.45 |
| 2026-08-06 12:00 |
15:02:42.07 |
+11:15:31.7 |
HIP 73691 |
29.85 |
| 2026-08-07 00:00 |
15:02:41.58 |
+11:15:08.1 |
HIP 73691 |
30.25 |
| 2026-08-07 12:00 |
15:02:41.12 |
+11:14:44.4 |
HIP 73691 |
30.65 |
| 2026-08-08 00:00 |
15:02:40.69 |
+11:14:20.5 |
HIP 73691 |
31.04 |
| 2026-08-08 12:00 |
15:02:40.30 |
+11:13:56.6 |
HIP 73691 |
31.44 |
| 2026-08-09 00:00 |
15:02:39.93 |
+11:13:32.5 |
HIP 73691 |
31.83 |
| 2026-08-09 12:00 |
15:02:39.60 |
+11:13:08.3 |
HIP 73691 |
32.22 |
| 2026-08-10 00:00 |
15:02:39.29 |
+11:12:44.0 |
HIP 73691 |
32.61 |
| 2026-08-10 12:00 |
15:02:39.02 |
+11:12:19.6 |
HIP 73619 |
32.47 |
| 2026-08-11 00:00 |
15:02:38.79 |
+11:11:55.0 |
HIP 73619 |
32.07 |
| 2026-08-11 12:00 |
15:02:38.58 |
+11:11:30.4 |
HIP 73619 |
31.66 |
| 2026-08-12 00:00 |
15:02:38.40 |
+11:11:05.6 |
HIP 73619 |
31.26 |
| 2026-08-12 12:00 |
15:02:38.26 |
+11:10:40.8 |
HIP 73619 |
30.85 |
| 2026-08-13 00:00 |
15:02:38.15 |
+11:10:15.9 |
HIP 73619 |
30.44 |
| 2026-08-13 12:00 |
15:02:38.07 |
+11:09:50.8 |
HIP 73619 |
30.03 |
| 2026-08-14 00:00 |
15:02:38.02 |
+11:09:25.7 |
HIP 73619 |
29.62 |
| 2026-08-14 12:00 |
15:02:38.00 |
+11:09:00.5 |
HIP 73619 |
29.20 |
| 2026-08-15 00:00 |
15:02:38.01 |
+11:08:35.2 |
HIP 73619 |
28.78 |
| 2026-08-15 12:00 |
15:02:38.06 |
+11:08:09.8 |
HIP 73619 |
28.36 |
| 2026-08-16 00:00 |
15:02:38.13 |
+11:07:44.3 |
HIP 73619 |
27.94 |
| 2026-08-16 12:00 |
15:02:38.24 |
+11:07:18.7 |
HIP 73619 |
27.51 |
| 2026-08-17 00:00 |
15:02:38.38 |
+11:06:53.1 |
HIP 73619 |
27.08 |
| 2026-08-17 12:00 |
15:02:38.55 |
+11:06:27.3 |
HIP 73619 |
26.65 |
| 2026-08-18 00:00 |
15:02:38.75 |
+11:06:01.5 |
HIP 73619 |
26.22 |
| 2026-08-18 12:00 |
15:02:38.98 |
+11:05:35.6 |
HIP 73619 |
25.78 |
| 2026-08-19 00:00 |
15:02:39.24 |
+11:05:09.7 |
HIP 73619 |
25.34 |