375P/Hill
メタデータ
| 項目 |
値 |
| Designation |
375P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-12-20T18:39:30.548160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:37Z |
| Obs used |
313 |
| NEO |
- |
| M1 |
16.700 |
| K1 |
6.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-07-29.0000000 |
| e |
0.66003940 |
| q (au) |
1.892519 |
| a (au) |
5.566878 |
| i (deg) |
17.369839 |
| Ω (om, deg) |
359.974029 |
| ω (w, deg) |
119.434290 |
| M (ma, deg) |
266.893415 |
等級
散乱 + 全体線形
$$
M_a = (18.115 + 2.060\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.115 |
| n |
2.060 |
| gf |
1.000 |
| gb |
-0.603 |
| k |
0.800 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
20:47:35.98 |
-31:21:50.8 |
HIP 102578 |
7.15 |
| 2026-02-03 12:00 |
20:47:51.73 |
-31:20:52.8 |
HIP 102690 |
9.37 |
| 2026-02-04 00:00 |
20:48:07.48 |
-31:19:55.1 |
HIP 102690 |
7.65 |
| 2026-02-04 12:00 |
20:48:23.21 |
-31:18:57.7 |
HIP 102690 |
7.32 |
| 2026-02-05 00:00 |
20:48:38.93 |
-31:18:00.5 |
HIP 102690 |
8.54 |
| 2026-02-05 12:00 |
20:48:54.64 |
-31:17:03.6 |
HIP 102690 |
10.80 |
| 2026-02-06 00:00 |
20:49:10.34 |
-31:16:07.0 |
HIP 102690 |
13.58 |
| 2026-02-06 12:00 |
20:49:26.02 |
-31:15:10.6 |
HIP 102892 |
16.21 |
| 2026-02-07 00:00 |
20:49:41.69 |
-31:14:14.5 |
HIP 102892 |
12.95 |
| 2026-02-07 12:00 |
20:49:57.34 |
-31:13:18.7 |
HIP 102892 |
9.82 |
| 2026-02-08 00:00 |
20:50:12.98 |
-31:12:23.2 |
HIP 102892 |
7.03 |
| 2026-02-08 12:00 |
20:50:28.60 |
-31:11:27.9 |
HIP 102892 |
5.14 |
| 2026-02-09 00:00 |
20:50:44.20 |
-31:10:32.9 |
HIP 102892 |
5.23 |
| 2026-02-09 12:00 |
20:50:59.79 |
-31:09:38.2 |
HIP 102892 |
7.22 |
| 2026-02-10 00:00 |
20:51:15.36 |
-31:08:43.7 |
HIP 102892 |
10.04 |
| 2026-02-10 12:00 |
20:51:30.91 |
-31:07:49.6 |
HIP 102892 |
13.15 |
| 2026-02-11 00:00 |
20:51:46.44 |
-31:06:55.8 |
HIP 102892 |
16.39 |
| 2026-02-11 12:00 |
20:52:01.95 |
-31:06:02.2 |
HIP 102892 |
19.70 |
| 2026-02-12 00:00 |
20:52:17.44 |
-31:05:09.0 |
HIP 102892 |
23.04 |
| 2026-02-12 12:00 |
20:52:32.91 |
-31:04:16.0 |
HIP 103011 |
22.80 |
| 2026-02-13 00:00 |
20:52:48.35 |
-31:03:23.3 |
HIP 103103 |
21.72 |
| 2026-02-13 12:00 |
20:53:03.77 |
-31:02:31.0 |
HIP 103103 |
19.91 |
| 2026-02-14 00:00 |
20:53:19.17 |
-31:01:39.0 |
HIP 103103 |
18.56 |
| 2026-02-14 12:00 |
20:53:34.55 |
-31:00:47.2 |
HIP 103103 |
17.77 |
| 2026-02-15 00:00 |
20:53:49.90 |
-30:59:55.8 |
HIP 103103 |
17.63 |
| 2026-02-15 12:00 |
20:54:05.22 |
-30:59:04.7 |
HIP 103103 |
18.14 |
| 2026-02-16 00:00 |
20:54:20.52 |
-30:58:13.9 |
HIP 103297 |
17.23 |
| 2026-02-16 12:00 |
20:54:35.79 |
-30:57:23.5 |
HIP 103297 |
13.85 |
| 2026-02-17 00:00 |
20:54:51.03 |
-30:56:33.3 |
HIP 103297 |
10.48 |
| 2026-02-17 12:00 |
20:55:06.24 |
-30:55:43.5 |
HIP 103297 |
7.11 |
| 2026-02-18 00:00 |
20:55:21.43 |
-30:54:54.1 |
HIP 103297 |
3.76 |
| 2026-02-18 12:00 |
20:55:36.58 |
-30:54:04.9 |
HIP 103297 |
0.47 |
| 2026-02-19 00:00 |
20:55:51.70 |
-30:53:16.1 |
HIP 103297 |
2.96 |
| 2026-02-19 12:00 |
20:56:06.79 |
-30:52:27.6 |
HIP 103297 |
6.29 |
| 2026-02-20 00:00 |
20:56:21.85 |
-30:51:39.5 |
HIP 103297 |
9.62 |
| 2026-02-20 12:00 |
20:56:36.88 |
-30:50:51.8 |
HIP 103297 |
12.94 |
| 2026-02-21 00:00 |
20:56:51.87 |
-30:50:04.3 |
HIP 103464 |
10.96 |
| 2026-02-21 12:00 |
20:57:06.83 |
-30:49:17.2 |
HIP 103464 |
7.73 |
| 2026-02-22 00:00 |
20:57:21.76 |
-30:48:30.5 |
HIP 103464 |
4.62 |
| 2026-02-22 12:00 |
20:57:36.64 |
-30:47:44.1 |
HIP 103464 |
2.15 |
| 2026-02-23 00:00 |
20:57:51.50 |
-30:46:58.1 |
HIP 103464 |
3.08 |
| 2026-02-23 12:00 |
20:58:06.31 |
-30:46:12.5 |
HIP 103464 |
5.98 |
| 2026-02-24 00:00 |
20:58:21.09 |
-30:45:27.2 |
HIP 103464 |
9.12 |