メタデータ
| 項目 |
値 |
| Designation |
100P/Hartley 1 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-04-02T02:13:28.588800Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T12:12:40Z |
| Obs used |
644 |
| NEO |
- |
| M1 |
9.900 |
| K1 |
23.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-04-02.0000000 |
| e |
0.41375811 |
| q (au) |
2.009747 |
| a (au) |
3.428188 |
| i (deg) |
25.584071 |
| Ω (om, deg) |
37.764478 |
| ω (w, deg) |
181.874834 |
| M (ma, deg) |
303.154223 |
等級
散乱 + 全体線形
$$
M_a = (11.868 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.868 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2022-01-26 |
2022-08-15 |
+10.8671 |
-3.807 |
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 |
02:34:18.12 |
+20:26:32.1 |
HIP 11897 |
11.41 |
| 2026-03-26 12:00 |
02:34:41.22 |
+20:28:51.6 |
HIP 11897 |
17.01 |
| 2026-03-27 00:00 |
02:35:04.41 |
+20:31:11.4 |
HIP 12097 |
21.30 |
| 2026-03-27 12:00 |
02:35:27.68 |
+20:33:31.4 |
HIP 12161 |
19.70 |
| 2026-03-28 00:00 |
02:35:51.03 |
+20:35:51.7 |
HIP 12161 |
13.76 |
| 2026-03-28 12:00 |
02:36:14.46 |
+20:38:12.2 |
HIP 12161 |
7.82 |
| 2026-03-29 00:00 |
02:36:37.97 |
+20:40:33.1 |
HIP 12161 |
1.99 |
| 2026-03-29 12:00 |
02:37:01.56 |
+20:42:54.1 |
HIP 12161 |
4.28 |
| 2026-03-30 00:00 |
02:37:25.22 |
+20:45:15.5 |
HIP 12161 |
10.25 |
| 2026-03-30 12:00 |
02:37:48.95 |
+20:47:37.0 |
HIP 12238 |
13.56 |
| 2026-03-31 00:00 |
02:38:12.77 |
+20:49:58.8 |
HIP 12238 |
17.90 |
| 2026-03-31 12:00 |
02:38:36.65 |
+20:52:20.9 |
HIP 12238 |
23.04 |
| 2026-04-01 00:00 |
02:39:00.62 |
+20:54:43.2 |
HIP 12468 |
26.94 |
| 2026-04-01 12:00 |
02:39:24.65 |
+20:57:05.7 |
HIP 12468 |
21.11 |
| 2026-04-02 00:00 |
02:39:48.76 |
+20:59:28.5 |
HIP 12468 |
15.47 |
| 2026-04-02 12:00 |
02:40:12.94 |
+21:01:51.4 |
HIP 12468 |
10.38 |
| 2026-04-03 00:00 |
02:40:37.19 |
+21:04:14.6 |
HIP 12468 |
7.14 |
| 2026-04-03 12:00 |
02:41:01.51 |
+21:06:38.0 |
HIP 12468 |
8.35 |
| 2026-04-04 00:00 |
02:41:25.90 |
+21:09:01.7 |
HIP 12487 |
11.55 |
| 2026-04-04 12:00 |
02:41:50.37 |
+21:11:25.5 |
HIP 12487 |
16.52 |
| 2026-04-05 00:00 |
02:42:14.90 |
+21:13:49.5 |
HIP 12733 |
20.70 |
| 2026-04-05 12:00 |
02:42:39.50 |
+21:16:13.8 |
HIP 12733 |
16.15 |
| 2026-04-06 00:00 |
02:43:04.16 |
+21:18:38.2 |
HIP 12733 |
13.05 |
| 2026-04-06 12:00 |
02:43:28.90 |
+21:21:02.8 |
HIP 12733 |
12.54 |
| 2026-04-07 00:00 |
02:43:53.70 |
+21:23:27.6 |
HIP 12733 |
14.92 |
| 2026-04-07 12:00 |
02:44:18.57 |
+21:25:52.7 |
HIP 12819 |
12.95 |
| 2026-04-08 00:00 |
02:44:43.50 |
+21:28:17.9 |
HIP 12819 |
8.62 |
| 2026-04-08 12:00 |
02:45:08.50 |
+21:30:43.2 |
HIP 12819 |
7.74 |
| 2026-04-09 00:00 |
02:45:33.56 |
+21:33:08.8 |
HIP 12819 |
11.19 |
| 2026-04-09 12:00 |
02:45:58.68 |
+21:35:34.5 |
HIP 12819 |
16.45 |
| 2026-04-10 00:00 |
02:46:23.87 |
+21:38:00.4 |
HIP 12819 |
22.28 |
| 2026-04-10 12:00 |
02:46:49.12 |
+21:40:26.5 |
HIP 13029 |
21.70 |
| 2026-04-11 00:00 |
02:47:14.43 |
+21:42:52.7 |
HIP 13029 |
22.38 |
| 2026-04-11 12:00 |
02:47:39.80 |
+21:45:19.1 |
HIP 13029 |
24.75 |
| 2026-04-12 00:00 |
02:48:05.24 |
+21:47:45.6 |
HIP 13029 |
28.39 |
| 2026-04-12 12:00 |
02:48:30.73 |
+21:50:12.3 |
HIP 13029 |
32.89 |
| 2026-04-13 00:00 |
02:48:56.28 |
+21:52:39.2 |
HIP 13253 |
26.71 |
| 2026-04-13 12:00 |
02:49:21.89 |
+21:55:06.1 |
HIP 13253 |
20.41 |
| 2026-04-14 00:00 |
02:49:47.56 |
+21:57:33.3 |
HIP 13253 |
14.20 |
| 2026-04-14 12:00 |
02:50:13.29 |
+22:00:00.5 |
HIP 13253 |
8.33 |
| 2026-04-15 00:00 |
02:50:39.07 |
+22:02:27.9 |
HIP 13253 |
4.53 |
| 2026-04-15 12:00 |
02:51:04.90 |
+22:04:55.5 |
HIP 13253 |
7.43 |
| 2026-04-16 00:00 |
02:51:30.80 |
+22:07:23.1 |
HIP 13253 |
13.18 |