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) |
| 2026-06-01 00:00 |
21:22:35.35 |
-30:52:10.0 |
HIP 105580 |
7.47 |
| 2026-06-01 12:00 |
21:22:32.54 |
-30:53:02.3 |
HIP 105580 |
8.42 |
| 2026-06-02 00:00 |
21:22:29.60 |
-30:53:55.0 |
HIP 105580 |
9.42 |
| 2026-06-02 12:00 |
21:22:26.54 |
-30:54:48.0 |
HIP 105580 |
10.46 |
| 2026-06-03 00:00 |
21:22:23.36 |
-30:55:41.5 |
HIP 105580 |
11.54 |
| 2026-06-03 12:00 |
21:22:20.05 |
-30:56:35.3 |
HIP 105580 |
12.65 |
| 2026-06-04 00:00 |
21:22:16.62 |
-30:57:29.5 |
HIP 105580 |
13.79 |
| 2026-06-04 12:00 |
21:22:13.07 |
-30:58:24.0 |
HIP 105580 |
14.95 |
| 2026-06-05 00:00 |
21:22:09.39 |
-30:59:18.9 |
HIP 105580 |
16.15 |
| 2026-06-05 12:00 |
21:22:05.59 |
-31:00:14.1 |
HIP 105395 |
15.82 |
| 2026-06-06 00:00 |
21:22:01.67 |
-31:01:09.7 |
HIP 105395 |
15.20 |
| 2026-06-06 12:00 |
21:21:57.63 |
-31:02:05.6 |
HIP 105395 |
14.64 |
| 2026-06-07 00:00 |
21:21:53.46 |
-31:03:01.8 |
HIP 105395 |
14.15 |
| 2026-06-07 12:00 |
21:21:49.17 |
-31:03:58.4 |
HIP 105395 |
13.74 |
| 2026-06-08 00:00 |
21:21:44.76 |
-31:04:55.3 |
HIP 105395 |
13.43 |
| 2026-06-08 12:00 |
21:21:40.22 |
-31:05:52.5 |
HIP 105395 |
13.24 |
| 2026-06-09 00:00 |
21:21:35.57 |
-31:06:50.0 |
HIP 105395 |
13.17 |
| 2026-06-09 12:00 |
21:21:30.79 |
-31:07:47.8 |
HIP 105395 |
13.23 |
| 2026-06-10 00:00 |
21:21:25.89 |
-31:08:45.9 |
HIP 105395 |
13.43 |
| 2026-06-10 12:00 |
21:21:20.87 |
-31:09:44.3 |
HIP 105395 |
13.77 |
| 2026-06-11 00:00 |
21:21:15.72 |
-31:10:42.9 |
HIP 105395 |
14.25 |
| 2026-06-11 12:00 |
21:21:10.46 |
-31:11:41.9 |
HIP 105395 |
14.85 |
| 2026-06-12 00:00 |
21:21:05.07 |
-31:12:41.1 |
HIP 105395 |
15.58 |
| 2026-06-12 12:00 |
21:20:59.57 |
-31:13:40.5 |
HIP 105395 |
16.42 |
| 2026-06-13 00:00 |
21:20:53.94 |
-31:14:40.3 |
HIP 105395 |
17.35 |
| 2026-06-13 12:00 |
21:20:48.19 |
-31:15:40.2 |
HIP 105395 |
18.38 |
| 2026-06-14 00:00 |
21:20:42.33 |
-31:16:40.4 |
HIP 105395 |
19.49 |
| 2026-06-14 12:00 |
21:20:36.34 |
-31:17:40.9 |
HIP 105395 |
20.68 |
| 2026-06-15 00:00 |
21:20:30.24 |
-31:18:41.5 |
HIP 105395 |
21.93 |
| 2026-06-15 12:00 |
21:20:24.01 |
-31:19:42.4 |
HIP 105395 |
23.24 |
| 2026-06-16 00:00 |
21:20:17.67 |
-31:20:43.5 |
HIP 105395 |
24.60 |
| 2026-06-16 12:00 |
21:20:11.21 |
-31:21:44.8 |
HIP 105395 |
26.02 |
| 2026-06-17 00:00 |
21:20:04.64 |
-31:22:46.3 |
HIP 105395 |
27.48 |
| 2026-06-17 12:00 |
21:19:57.95 |
-31:23:47.9 |
HIP 105395 |
28.99 |
| 2026-06-18 00:00 |
21:19:51.14 |
-31:24:49.8 |
HIP 105395 |
30.53 |
| 2026-06-18 12:00 |
21:19:44.22 |
-31:25:51.8 |
HIP 105395 |
32.12 |
| 2026-06-19 00:00 |
21:19:37.18 |
-31:26:53.9 |
HIP 105340 |
33.57 |
| 2026-06-19 12:00 |
21:19:30.03 |
-31:27:56.2 |
HIP 105340 |
32.95 |
| 2026-06-20 00:00 |
21:19:22.77 |
-31:28:58.7 |
HIP 105340 |
32.43 |
| 2026-06-20 12:00 |
21:19:15.39 |
-31:30:01.3 |
HIP 105340 |
32.02 |
| 2026-06-21 00:00 |
21:19:07.90 |
-31:31:04.0 |
HIP 105340 |
31.72 |
| 2026-06-21 12:00 |
21:19:00.30 |
-31:32:06.8 |
HIP 105085 |
30.45 |
| 2026-06-22 00:00 |
21:18:52.59 |
-31:33:09.8 |
HIP 105085 |
28.54 |