メタデータ
| 項目 |
値 |
| Designation |
71P/Clark |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-06-30T08:48:25.663680Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T15:24:44Z |
| Obs used |
1360 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
14.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-06-01.0000000 |
| e |
0.49450343 |
| q (au) |
1.586677 |
| a (au) |
3.138847 |
| i (deg) |
9.444491 |
| Ω (om, deg) |
59.443537 |
| ω (w, deg) |
208.969656 |
| M (ma, deg) |
124.176492 |
等級
散乱 + 全体線形
$$
M_a = (9.843 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.843 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.916 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2022-01-06 |
2023-06-09 |
+13.0262 |
-5.820 |
| 2023-06-09 |
2023-01-22 |
+8.6983 |
-3.636 |
| 2023-01-22 |
2024-12-03 |
+1.1015 |
-0.517 |
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) |
| 2026-09-20 00:00 |
08:23:39.57 |
+26:05:02.8 |
HIP 41014 |
21.76 |
| 2026-09-20 12:00 |
08:24:04.45 |
+26:04:25.9 |
HIP 41194 |
23.84 |
| 2026-09-21 00:00 |
08:24:29.22 |
+26:03:49.3 |
HIP 41194 |
24.18 |
| 2026-09-21 12:00 |
08:24:53.89 |
+26:03:13.1 |
HIP 41194 |
25.75 |
| 2026-09-22 00:00 |
08:25:18.44 |
+26:02:37.3 |
HIP 41194 |
28.32 |
| 2026-09-22 12:00 |
08:25:42.89 |
+26:02:02.0 |
HIP 41447 |
27.81 |
| 2026-09-23 00:00 |
08:26:07.23 |
+26:01:27.1 |
HIP 41447 |
23.56 |
| 2026-09-23 12:00 |
08:26:31.46 |
+26:00:52.6 |
HIP 41447 |
19.95 |
| 2026-09-24 00:00 |
08:26:55.58 |
+26:00:18.6 |
HIP 41447 |
17.36 |
| 2026-09-24 12:00 |
08:27:19.59 |
+25:59:45.0 |
HIP 41447 |
16.26 |
| 2026-09-25 00:00 |
08:27:43.48 |
+25:59:11.9 |
HIP 41447 |
16.93 |
| 2026-09-25 12:00 |
08:28:07.26 |
+25:58:39.2 |
HIP 41447 |
19.15 |
| 2026-09-26 00:00 |
08:28:30.93 |
+25:58:07.1 |
HIP 41679 |
22.20 |
| 2026-09-26 12:00 |
08:28:54.48 |
+25:57:35.3 |
HIP 41679 |
18.67 |
| 2026-09-27 00:00 |
08:29:17.92 |
+25:57:04.1 |
HIP 41679 |
16.15 |
| 2026-09-27 12:00 |
08:29:41.23 |
+25:56:33.4 |
HIP 41679 |
15.13 |
| 2026-09-28 00:00 |
08:30:04.43 |
+25:56:03.1 |
HIP 41760 |
12.75 |
| 2026-09-28 12:00 |
08:30:27.51 |
+25:55:33.4 |
HIP 41760 |
8.65 |
| 2026-09-29 00:00 |
08:30:50.47 |
+25:55:04.2 |
HIP 41760 |
6.42 |
| 2026-09-29 12:00 |
08:31:13.31 |
+25:54:35.5 |
HIP 41760 |
7.81 |
| 2026-09-30 00:00 |
08:31:36.03 |
+25:54:07.3 |
HIP 41791 |
10.70 |
| 2026-09-30 12:00 |
08:31:58.62 |
+25:53:39.6 |
HIP 41791 |
13.33 |
| 2026-10-01 00:00 |
08:32:21.09 |
+25:53:12.5 |
HIP 41791 |
17.10 |
| 2026-10-01 12:00 |
08:32:43.43 |
+25:52:46.0 |
HIP 41791 |
21.40 |
| 2026-10-02 00:00 |
08:33:05.65 |
+25:52:20.0 |
HIP 41950 |
24.77 |
| 2026-10-02 12:00 |
08:33:27.74 |
+25:51:54.6 |
HIP 42052 |
24.16 |
| 2026-10-03 00:00 |
08:33:49.70 |
+25:51:29.7 |
HIP 42052 |
21.85 |
| 2026-10-03 12:00 |
08:34:11.53 |
+25:51:05.4 |
HIP 42052 |
20.53 |
| 2026-10-04 00:00 |
08:34:33.22 |
+25:50:41.8 |
HIP 42052 |
20.34 |
| 2026-10-04 12:00 |
08:34:54.79 |
+25:50:18.7 |
HIP 42052 |
21.32 |
| 2026-10-05 00:00 |
08:35:16.22 |
+25:49:56.2 |
HIP 42243 |
20.46 |
| 2026-10-05 12:00 |
08:35:37.51 |
+25:49:34.4 |
HIP 42243 |
16.12 |
| 2026-10-06 00:00 |
08:35:58.67 |
+25:49:13.1 |
HIP 42243 |
12.15 |
| 2026-10-06 12:00 |
08:36:19.69 |
+25:48:52.5 |
HIP 42243 |
9.01 |
| 2026-10-07 00:00 |
08:36:40.57 |
+25:48:32.6 |
HIP 42243 |
7.71 |
| 2026-10-07 12:00 |
08:37:01.30 |
+25:48:13.3 |
HIP 42243 |
9.04 |
| 2026-10-08 00:00 |
08:37:21.90 |
+25:47:54.7 |
HIP 42243 |
12.12 |
| 2026-10-08 12:00 |
08:37:42.36 |
+25:47:36.7 |
HIP 42243 |
15.94 |
| 2026-10-09 00:00 |
08:38:02.66 |
+25:47:19.4 |
HIP 42356 |
15.70 |
| 2026-10-09 12:00 |
08:38:22.83 |
+25:47:02.8 |
HIP 42356 |
16.24 |
| 2026-10-10 00:00 |
08:38:42.84 |
+25:46:46.9 |
HIP 42356 |
17.92 |
| 2026-10-10 12:00 |
08:39:02.71 |
+25:46:31.7 |
HIP 42356 |
20.45 |
| 2026-10-11 00:00 |
08:39:22.43 |
+25:46:17.1 |
HIP 42356 |
23.53 |