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 |
-0.500 |
| 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) |
| 2026-07-29 00:00 |
04:24:30.63 |
+30:32:51.5 |
HIP 20415 |
28.97 |
| 2026-07-29 12:00 |
04:24:53.10 |
+30:35:11.8 |
HIP 20415 |
34.26 |
| 2026-07-30 00:00 |
04:25:15.46 |
+30:37:32.1 |
HIP 20621 |
36.29 |
| 2026-07-30 12:00 |
04:25:37.72 |
+30:39:52.3 |
HIP 20621 |
34.55 |
| 2026-07-31 00:00 |
04:25:59.87 |
+30:42:12.6 |
HIP 20621 |
33.56 |
| 2026-07-31 12:00 |
04:26:21.91 |
+30:44:32.9 |
HIP 20621 |
33.37 |
| 2026-08-01 00:00 |
04:26:43.85 |
+30:46:53.3 |
HIP 20621 |
34.00 |
| 2026-08-01 12:00 |
04:27:05.67 |
+30:49:13.6 |
HIP 20621 |
35.38 |
| 2026-08-02 00:00 |
04:27:27.39 |
+30:51:34.0 |
HIP 20907 |
34.89 |
| 2026-08-02 12:00 |
04:27:49.00 |
+30:53:54.4 |
HIP 20907 |
34.82 |
| 2026-08-03 00:00 |
04:28:10.49 |
+30:56:14.8 |
HIP 20907 |
35.53 |
| 2026-08-03 12:00 |
04:28:31.86 |
+30:58:35.3 |
HIP 20907 |
36.97 |
| 2026-08-04 00:00 |
04:28:53.13 |
+31:00:55.8 |
HIP 21105 |
35.76 |
| 2026-08-04 12:00 |
04:29:14.27 |
+31:03:16.3 |
HIP 21105 |
30.66 |
| 2026-08-05 00:00 |
04:29:35.30 |
+31:05:36.9 |
HIP 21105 |
25.59 |
| 2026-08-05 12:00 |
04:29:56.21 |
+31:07:57.5 |
HIP 21105 |
20.54 |
| 2026-08-06 00:00 |
04:30:16.99 |
+31:10:18.1 |
HIP 21105 |
15.52 |
| 2026-08-06 12:00 |
04:30:37.66 |
+31:12:38.8 |
HIP 21105 |
10.53 |
| 2026-08-07 00:00 |
04:30:58.20 |
+31:14:59.5 |
HIP 21105 |
5.60 |
| 2026-08-07 12:00 |
04:31:18.62 |
+31:17:20.3 |
HIP 21105 |
1.16 |
| 2026-08-08 00:00 |
04:31:38.91 |
+31:19:41.1 |
HIP 21105 |
4.50 |
| 2026-08-08 12:00 |
04:31:59.07 |
+31:22:01.9 |
HIP 21196 |
9.20 |
| 2026-08-09 00:00 |
04:32:19.10 |
+31:24:22.8 |
HIP 21196 |
4.64 |
| 2026-08-09 12:00 |
04:32:39.00 |
+31:26:43.8 |
HIP 21196 |
2.46 |
| 2026-08-10 00:00 |
04:32:58.77 |
+31:29:04.8 |
HIP 21196 |
6.12 |
| 2026-08-10 12:00 |
04:33:18.40 |
+31:31:25.9 |
HIP 21196 |
10.72 |
| 2026-08-11 00:00 |
04:33:37.90 |
+31:33:47.0 |
HIP 21196 |
15.43 |
| 2026-08-11 12:00 |
04:33:57.27 |
+31:36:08.2 |
HIP 21196 |
20.14 |
| 2026-08-12 00:00 |
04:34:16.49 |
+31:38:29.4 |
HIP 21196 |
24.84 |
| 2026-08-12 12:00 |
04:34:35.58 |
+31:40:50.7 |
HIP 21196 |
29.52 |
| 2026-08-13 00:00 |
04:34:54.52 |
+31:43:12.1 |
HIP 21283 |
33.12 |
| 2026-08-13 12:00 |
04:35:13.32 |
+31:45:33.5 |
HIP 21283 |
36.84 |
| 2026-08-14 00:00 |
04:35:31.98 |
+31:47:55.0 |
HIP 21602 |
36.67 |
| 2026-08-14 12:00 |
04:35:50.49 |
+31:50:16.6 |
HIP 21602 |
32.20 |
| 2026-08-15 00:00 |
04:36:08.85 |
+31:52:38.2 |
HIP 21602 |
27.79 |
| 2026-08-15 12:00 |
04:36:27.07 |
+31:55:00.0 |
HIP 21602 |
23.47 |
| 2026-08-16 00:00 |
04:36:45.13 |
+31:57:21.7 |
HIP 21602 |
19.28 |
| 2026-08-16 12:00 |
04:37:03.05 |
+31:59:43.6 |
HIP 21602 |
15.31 |
| 2026-08-17 00:00 |
04:37:20.81 |
+32:02:05.5 |
HIP 21602 |
11.74 |
| 2026-08-17 12:00 |
04:37:38.42 |
+32:04:27.5 |
HIP 21602 |
9.02 |
| 2026-08-18 00:00 |
04:37:55.87 |
+32:06:49.6 |
HIP 21602 |
8.02 |
| 2026-08-18 12:00 |
04:38:13.17 |
+32:09:11.7 |
HIP 21602 |
9.28 |
| 2026-08-19 00:00 |
04:38:30.31 |
+32:11:34.0 |
HIP 21602 |
12.07 |