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 |
+13.0263 |
-5.820 |
| 2023-06-09 |
2023-01-22 |
+8.6982 |
-3.636 |
| 2023-01-22 |
2024-12-03 |
+1.1022 |
-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) |
| 2026-05-12 00:00 |
06:13:28.78 |
+28:49:32.8 |
HIP 29675 |
22.35 |
| 2026-05-12 12:00 |
06:13:55.40 |
+28:49:17.8 |
HIP 29675 |
16.97 |
| 2026-05-13 00:00 |
06:14:22.11 |
+28:49:02.6 |
HIP 29675 |
12.00 |
| 2026-05-13 12:00 |
06:14:48.91 |
+28:48:47.3 |
HIP 29675 |
8.28 |
| 2026-05-14 00:00 |
06:15:15.81 |
+28:48:31.8 |
HIP 29675 |
7.89 |
| 2026-05-14 12:00 |
06:15:42.79 |
+28:48:16.2 |
HIP 29793 |
9.09 |
| 2026-05-15 00:00 |
06:16:09.86 |
+28:48:00.4 |
HIP 29793 |
4.12 |
| 2026-05-15 12:00 |
06:16:37.02 |
+28:47:44.4 |
HIP 29793 |
4.69 |
| 2026-05-16 00:00 |
06:17:04.26 |
+28:47:28.3 |
HIP 29793 |
9.91 |
| 2026-05-16 12:00 |
06:17:31.60 |
+28:47:12.0 |
HIP 29793 |
15.70 |
| 2026-05-17 00:00 |
06:17:59.01 |
+28:46:55.5 |
HIP 29793 |
21.62 |
| 2026-05-17 12:00 |
06:18:26.51 |
+28:46:38.9 |
HIP 29793 |
27.59 |
| 2026-05-18 00:00 |
06:18:54.09 |
+28:46:22.0 |
HIP 30137 |
22.06 |
| 2026-05-18 12:00 |
06:19:21.76 |
+28:46:05.1 |
HIP 30137 |
16.13 |
| 2026-05-19 00:00 |
06:19:49.50 |
+28:45:47.9 |
HIP 30137 |
10.36 |
| 2026-05-19 12:00 |
06:20:17.33 |
+28:45:30.5 |
HIP 30137 |
5.31 |
| 2026-05-20 00:00 |
06:20:45.23 |
+28:45:13.0 |
HIP 30137 |
4.88 |
| 2026-05-20 12:00 |
06:21:13.21 |
+28:44:55.3 |
HIP 30137 |
9.73 |
| 2026-05-21 00:00 |
06:21:41.26 |
+28:44:37.4 |
HIP 30137 |
15.54 |
| 2026-05-21 12:00 |
06:22:09.39 |
+28:44:19.4 |
HIP 30348 |
13.19 |
| 2026-05-22 00:00 |
06:22:37.60 |
+28:44:01.1 |
HIP 30348 |
8.37 |
| 2026-05-22 12:00 |
06:23:05.88 |
+28:43:42.7 |
HIP 30388 |
4.10 |
| 2026-05-23 00:00 |
06:23:34.23 |
+28:43:24.0 |
HIP 30388 |
3.14 |
| 2026-05-23 12:00 |
06:24:02.65 |
+28:43:05.2 |
HIP 30388 |
8.98 |
| 2026-05-24 00:00 |
06:24:31.14 |
+28:42:46.2 |
HIP 30388 |
15.16 |
| 2026-05-24 12:00 |
06:24:59.70 |
+28:42:26.9 |
HIP 30388 |
21.39 |
| 2026-05-25 00:00 |
06:25:28.33 |
+28:42:07.5 |
HIP 30388 |
27.66 |
| 2026-05-25 12:00 |
06:25:57.03 |
+28:41:47.9 |
HIP 30388 |
33.95 |
| 2026-05-26 00:00 |
06:26:25.80 |
+28:41:28.1 |
HIP 30779 |
39.27 |
| 2026-05-26 12:00 |
06:26:54.63 |
+28:41:08.1 |
HIP 30779 |
36.55 |
| 2026-05-27 00:00 |
06:27:23.53 |
+28:40:47.9 |
HIP 30943 |
30.41 |
| 2026-05-27 12:00 |
06:27:52.49 |
+28:40:27.4 |
HIP 30943 |
24.31 |
| 2026-05-28 00:00 |
06:28:21.51 |
+28:40:06.8 |
HIP 30943 |
18.37 |
| 2026-05-28 12:00 |
06:28:50.60 |
+28:39:45.9 |
HIP 30943 |
12.84 |
| 2026-05-29 00:00 |
06:29:19.75 |
+28:39:24.9 |
HIP 30943 |
8.60 |
| 2026-05-29 12:00 |
06:29:48.96 |
+28:39:03.6 |
HIP 30943 |
8.05 |
| 2026-05-30 00:00 |
06:30:18.23 |
+28:38:42.1 |
HIP 30943 |
11.76 |
| 2026-05-30 12:00 |
06:30:47.56 |
+28:38:20.5 |
HIP 30943 |
17.18 |
| 2026-05-31 00:00 |
06:31:16.95 |
+28:37:58.5 |
HIP 31117 |
22.16 |
| 2026-05-31 12:00 |
06:31:46.40 |
+28:37:36.4 |
HIP 31117 |
21.61 |
| 2026-06-01 00:00 |
06:32:15.91 |
+28:37:14.1 |
HIP 31219 |
19.28 |
| 2026-06-01 12:00 |
06:32:45.48 |
+28:36:51.5 |
HIP 31219 |
16.96 |
| 2026-06-02 00:00 |
06:33:15.10 |
+28:36:28.7 |
HIP 31219 |
16.99 |