67P/Churyumov-Gerasimenko
メタデータ
| 項目 |
値 |
| Designation |
67P/Churyumov-Gerasimenko |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-08-13T02:07:40.042560Z |
| Orbit solution date (soln_date, UTC) |
2024-02-01T08:49:50Z |
| Obs used |
8608 |
| NEO |
Yes |
| M1 |
12.900 |
| K1 |
7.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-10-10.0000000 |
| e |
0.64090813 |
| q (au) |
1.243266 |
| a (au) |
3.462249 |
| i (deg) |
7.040295 |
| Ω (om, deg) |
50.135574 |
| ω (w, deg) |
12.798250 |
| M (ma, deg) |
8.859927 |
等級
散乱 + 全体線形
$$
M_a = (12.808 + 3.265\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.808 |
| n |
3.265 |
| gf |
0.956 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
1.393 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2021-02-02 |
2023-04-26 |
-0.3121 |
-0.509 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
17:32:23.17 |
-25:29:43.4 |
HIP 85882 |
28.41 |
| 2026-02-03 12:00 |
17:32:44.15 |
-25:30:09.6 |
HIP 85882 |
27.67 |
| 2026-02-04 00:00 |
17:33:05.03 |
-25:30:35.7 |
HIP 86038 |
26.17 |
| 2026-02-04 12:00 |
17:33:25.82 |
-25:31:01.6 |
HIP 86038 |
21.63 |
| 2026-02-05 00:00 |
17:33:46.51 |
-25:31:27.3 |
HIP 86038 |
17.19 |
| 2026-02-05 12:00 |
17:34:07.11 |
-25:31:52.9 |
HIP 86038 |
12.96 |
| 2026-02-06 00:00 |
17:34:27.60 |
-25:32:18.4 |
HIP 86038 |
9.18 |
| 2026-02-06 12:00 |
17:34:47.99 |
-25:32:43.8 |
HIP 86038 |
6.62 |
| 2026-02-07 00:00 |
17:35:08.29 |
-25:33:08.9 |
HIP 86038 |
6.78 |
| 2026-02-07 12:00 |
17:35:28.48 |
-25:33:34.0 |
HIP 86038 |
9.49 |
| 2026-02-08 00:00 |
17:35:48.56 |
-25:33:58.9 |
HIP 86038 |
13.24 |
| 2026-02-08 12:00 |
17:36:08.55 |
-25:34:23.7 |
HIP 86038 |
17.36 |
| 2026-02-09 00:00 |
17:36:28.43 |
-25:34:48.4 |
HIP 86038 |
21.62 |
| 2026-02-09 12:00 |
17:36:48.20 |
-25:35:12.9 |
HIP 86038 |
25.94 |
| 2026-02-10 00:00 |
17:37:07.86 |
-25:35:37.3 |
HIP 86038 |
30.28 |
| 2026-02-10 12:00 |
17:37:27.41 |
-25:36:01.6 |
HIP 86038 |
34.62 |
| 2026-02-11 00:00 |
17:37:46.86 |
-25:36:25.7 |
HIP 86498 |
37.91 |
| 2026-02-11 12:00 |
17:38:06.19 |
-25:36:49.7 |
HIP 86498 |
33.54 |
| 2026-02-12 00:00 |
17:38:25.41 |
-25:37:13.7 |
HIP 86498 |
29.21 |
| 2026-02-12 12:00 |
17:38:44.51 |
-25:37:37.4 |
HIP 86498 |
24.90 |
| 2026-02-13 00:00 |
17:39:03.50 |
-25:38:01.1 |
HIP 86498 |
20.62 |
| 2026-02-13 12:00 |
17:39:22.38 |
-25:38:24.7 |
HIP 86498 |
16.39 |
| 2026-02-14 00:00 |
17:39:41.14 |
-25:38:48.1 |
HIP 86498 |
12.21 |
| 2026-02-14 12:00 |
17:39:59.78 |
-25:39:11.5 |
HIP 86498 |
8.12 |
| 2026-02-15 00:00 |
17:40:18.30 |
-25:39:34.7 |
HIP 86498 |
4.31 |
| 2026-02-15 12:00 |
17:40:36.70 |
-25:39:57.8 |
HIP 86498 |
2.53 |
| 2026-02-16 00:00 |
17:40:54.98 |
-25:40:20.9 |
HIP 86498 |
5.35 |
| 2026-02-16 12:00 |
17:41:13.13 |
-25:40:43.8 |
HIP 86498 |
9.20 |
| 2026-02-17 00:00 |
17:41:31.16 |
-25:41:06.6 |
HIP 86498 |
13.18 |
| 2026-02-17 12:00 |
17:41:49.07 |
-25:41:29.4 |
HIP 86583 |
16.98 |
| 2026-02-18 00:00 |
17:42:06.84 |
-25:41:52.0 |
HIP 86583 |
17.57 |
| 2026-02-18 12:00 |
17:42:24.50 |
-25:42:14.5 |
HIP 86583 |
19.00 |
| 2026-02-19 00:00 |
17:42:42.02 |
-25:42:37.0 |
HIP 86583 |
21.07 |
| 2026-02-19 12:00 |
17:42:59.41 |
-25:42:59.4 |
HIP 86583 |
23.61 |
| 2026-02-20 00:00 |
17:43:16.67 |
-25:43:21.7 |
HIP 86583 |
26.47 |
| 2026-02-20 12:00 |
17:43:33.80 |
-25:43:43.9 |
HIP 86719 |
27.50 |
| 2026-02-21 00:00 |
17:43:50.79 |
-25:44:06.0 |
HIP 86719 |
28.20 |
| 2026-02-21 12:00 |
17:44:07.65 |
-25:44:28.0 |
HIP 86719 |
29.37 |
| 2026-02-22 00:00 |
17:44:24.38 |
-25:44:50.0 |
HIP 86719 |
30.96 |
| 2026-02-22 12:00 |
17:44:40.97 |
-25:45:11.9 |
HIP 87009 |
27.49 |
| 2026-02-23 00:00 |
17:44:57.42 |
-25:45:33.8 |
HIP 87009 |
23.79 |
| 2026-02-23 12:00 |
17:45:13.73 |
-25:45:55.5 |
HIP 87009 |
20.12 |
| 2026-02-24 00:00 |
17:45:29.90 |
-25:46:17.2 |
HIP 87009 |
16.50 |