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) |
| 2026-03-26 00:00 |
05:41:03.09 |
+29:08:34.8 |
HIP 26711 |
11.61 |
| 2026-03-26 12:00 |
05:41:16.34 |
+29:08:21.1 |
HIP 26711 |
13.17 |
| 2026-03-27 00:00 |
05:41:29.78 |
+29:08:07.6 |
HIP 26711 |
15.16 |
| 2026-03-27 12:00 |
05:41:43.43 |
+29:07:54.2 |
HIP 26711 |
17.46 |
| 2026-03-28 00:00 |
05:41:57.26 |
+29:07:40.9 |
HIP 26969 |
19.17 |
| 2026-03-28 12:00 |
05:42:11.29 |
+29:07:27.8 |
HIP 26969 |
16.26 |
| 2026-03-29 00:00 |
05:42:25.52 |
+29:07:14.7 |
HIP 26969 |
13.39 |
| 2026-03-29 12:00 |
05:42:39.93 |
+29:07:01.8 |
HIP 26969 |
10.61 |
| 2026-03-30 00:00 |
05:42:54.53 |
+29:06:48.9 |
HIP 26969 |
8.07 |
| 2026-03-30 12:00 |
05:43:09.32 |
+29:06:36.1 |
HIP 26969 |
6.16 |
| 2026-03-31 00:00 |
05:43:24.30 |
+29:06:23.5 |
HIP 26969 |
5.63 |
| 2026-03-31 12:00 |
05:43:39.46 |
+29:06:10.9 |
HIP 26969 |
6.87 |
| 2026-04-01 00:00 |
05:43:54.81 |
+29:05:58.5 |
HIP 26969 |
9.24 |
| 2026-04-01 12:00 |
05:44:10.34 |
+29:05:46.1 |
HIP 27088 |
7.66 |
| 2026-04-02 00:00 |
05:44:26.05 |
+29:05:33.8 |
HIP 27088 |
5.23 |
| 2026-04-02 12:00 |
05:44:41.94 |
+29:05:21.6 |
HIP 27088 |
4.46 |
| 2026-04-03 00:00 |
05:44:58.01 |
+29:05:09.5 |
HIP 27088 |
6.08 |
| 2026-04-03 12:00 |
05:45:14.26 |
+29:04:57.4 |
HIP 27088 |
8.91 |
| 2026-04-04 00:00 |
05:45:30.68 |
+29:04:45.5 |
HIP 27088 |
12.17 |
| 2026-04-04 12:00 |
05:45:47.29 |
+29:04:33.6 |
HIP 27172 |
13.77 |
| 2026-04-05 00:00 |
05:46:04.06 |
+29:04:21.8 |
HIP 27172 |
15.27 |
| 2026-04-05 12:00 |
05:46:21.01 |
+29:04:10.0 |
HIP 27172 |
17.45 |
| 2026-04-06 00:00 |
05:46:38.13 |
+29:03:58.3 |
HIP 27172 |
20.10 |
| 2026-04-06 12:00 |
05:46:55.42 |
+29:03:46.7 |
HIP 27376 |
20.73 |
| 2026-04-07 00:00 |
05:47:12.88 |
+29:03:35.1 |
HIP 27376 |
18.47 |
| 2026-04-07 12:00 |
05:47:30.51 |
+29:03:23.6 |
HIP 27376 |
16.78 |
| 2026-04-08 00:00 |
05:47:48.31 |
+29:03:12.2 |
HIP 27459 |
15.11 |
| 2026-04-08 12:00 |
05:48:06.28 |
+29:03:00.8 |
HIP 27459 |
11.56 |
| 2026-04-09 00:00 |
05:48:24.41 |
+29:02:49.4 |
HIP 27459 |
8.33 |
| 2026-04-09 12:00 |
05:48:42.70 |
+29:02:38.1 |
HIP 27459 |
6.03 |
| 2026-04-10 00:00 |
05:49:01.16 |
+29:02:26.8 |
HIP 27459 |
5.95 |
| 2026-04-10 12:00 |
05:49:19.78 |
+29:02:15.6 |
HIP 27459 |
8.21 |
| 2026-04-11 00:00 |
05:49:38.56 |
+29:02:04.4 |
HIP 27459 |
11.55 |
| 2026-04-11 12:00 |
05:49:57.50 |
+29:01:53.3 |
HIP 27459 |
15.30 |
| 2026-04-12 00:00 |
05:50:16.60 |
+29:01:42.1 |
HIP 27459 |
19.24 |
| 2026-04-12 12:00 |
05:50:35.86 |
+29:01:31.0 |
HIP 27459 |
23.30 |
| 2026-04-13 00:00 |
05:50:55.27 |
+29:01:20.0 |
HIP 27798 |
27.12 |
| 2026-04-13 12:00 |
05:51:14.84 |
+29:01:08.9 |
HIP 27798 |
22.99 |
| 2026-04-14 00:00 |
05:51:34.56 |
+29:00:57.9 |
HIP 27798 |
18.89 |
| 2026-04-14 12:00 |
05:51:54.44 |
+29:00:46.8 |
HIP 27798 |
14.89 |
| 2026-04-15 00:00 |
05:52:14.47 |
+29:00:35.8 |
HIP 27798 |
11.11 |
| 2026-04-15 12:00 |
05:52:34.65 |
+29:00:24.8 |
HIP 27798 |
7.96 |
| 2026-04-16 00:00 |
05:52:54.98 |
+29:00:13.8 |
HIP 27798 |
6.50 |