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) |
| 2026-07-29 00:00 |
21:05:15.08 |
-32:46:05.1 |
HIP 104071 |
4.08 |
| 2026-07-29 12:00 |
21:05:01.78 |
-32:46:52.3 |
HIP 104071 |
2.78 |
| 2026-07-30 00:00 |
21:04:48.45 |
-32:47:39.1 |
HIP 104071 |
3.96 |
| 2026-07-30 12:00 |
21:04:35.10 |
-32:48:25.3 |
HIP 104071 |
6.37 |
| 2026-07-31 00:00 |
21:04:21.73 |
-32:49:11.0 |
HIP 104071 |
9.09 |
| 2026-07-31 12:00 |
21:04:08.34 |
-32:49:56.2 |
HIP 104071 |
11.90 |
| 2026-08-01 00:00 |
21:03:54.92 |
-32:50:40.8 |
HIP 104071 |
14.75 |
| 2026-08-01 12:00 |
21:03:41.49 |
-32:51:24.9 |
HIP 104071 |
17.63 |
| 2026-08-02 00:00 |
21:03:28.04 |
-32:52:08.5 |
HIP 103883 |
17.99 |
| 2026-08-02 12:00 |
21:03:14.58 |
-32:52:51.5 |
HIP 103883 |
17.91 |
| 2026-08-03 00:00 |
21:03:01.10 |
-32:53:33.9 |
HIP 103883 |
18.29 |
| 2026-08-03 12:00 |
21:02:47.61 |
-32:54:15.8 |
HIP 103748 |
17.16 |
| 2026-08-04 00:00 |
21:02:34.12 |
-32:54:57.1 |
HIP 103748 |
14.37 |
| 2026-08-04 12:00 |
21:02:20.61 |
-32:55:37.8 |
HIP 103748 |
11.64 |
| 2026-08-05 00:00 |
21:02:07.09 |
-32:56:17.9 |
HIP 103748 |
9.02 |
| 2026-08-05 12:00 |
21:01:53.57 |
-32:56:57.4 |
HIP 103748 |
6.64 |
| 2026-08-06 00:00 |
21:01:40.05 |
-32:57:36.4 |
HIP 103748 |
4.88 |
| 2026-08-06 12:00 |
21:01:26.52 |
-32:58:14.7 |
HIP 103748 |
4.51 |
| 2026-08-07 00:00 |
21:01:12.99 |
-32:58:52.5 |
HIP 103748 |
5.81 |
| 2026-08-07 12:00 |
21:00:59.47 |
-32:59:29.6 |
HIP 103748 |
7.99 |
| 2026-08-08 00:00 |
21:00:45.94 |
-33:00:06.1 |
HIP 103748 |
10.53 |
| 2026-08-08 12:00 |
21:00:32.42 |
-33:00:42.0 |
HIP 103748 |
13.20 |
| 2026-08-09 00:00 |
21:00:18.90 |
-33:01:17.3 |
HIP 103748 |
15.95 |
| 2026-08-09 12:00 |
21:00:05.39 |
-33:01:51.9 |
HIP 103748 |
18.74 |
| 2026-08-10 00:00 |
20:59:51.89 |
-33:02:25.9 |
HIP 103748 |
21.55 |
| 2026-08-10 12:00 |
20:59:38.41 |
-33:02:59.2 |
HIP 103748 |
24.37 |
| 2026-08-11 00:00 |
20:59:24.93 |
-33:03:31.9 |
HIP 103465 |
26.42 |
| 2026-08-11 12:00 |
20:59:11.47 |
-33:04:04.0 |
HIP 103465 |
24.54 |
| 2026-08-12 00:00 |
20:58:58.02 |
-33:04:35.3 |
HIP 103465 |
22.86 |
| 2026-08-12 12:00 |
20:58:44.59 |
-33:05:06.1 |
HIP 103465 |
21.43 |
| 2026-08-13 00:00 |
20:58:31.18 |
-33:05:36.1 |
HIP 103465 |
20.29 |
| 2026-08-13 12:00 |
20:58:17.79 |
-33:06:05.5 |
HIP 103465 |
19.51 |
| 2026-08-14 00:00 |
20:58:04.43 |
-33:06:34.2 |
HIP 103465 |
19.11 |
| 2026-08-14 12:00 |
20:57:51.09 |
-33:07:02.2 |
HIP 103465 |
19.12 |
| 2026-08-15 00:00 |
20:57:37.77 |
-33:07:29.6 |
HIP 103465 |
19.54 |
| 2026-08-15 12:00 |
20:57:24.48 |
-33:07:56.3 |
HIP 103465 |
20.33 |
| 2026-08-16 00:00 |
20:57:11.23 |
-33:08:22.2 |
HIP 103465 |
21.45 |
| 2026-08-16 12:00 |
20:56:58.00 |
-33:08:47.5 |
HIP 103465 |
22.85 |
| 2026-08-17 00:00 |
20:56:44.81 |
-33:09:12.1 |
HIP 103465 |
24.49 |
| 2026-08-17 12:00 |
20:56:31.64 |
-33:09:36.0 |
HIP 103465 |
26.30 |
| 2026-08-18 00:00 |
20:56:18.52 |
-33:09:59.2 |
HIP 103465 |
28.26 |
| 2026-08-18 12:00 |
20:56:05.43 |
-33:10:21.7 |
HIP 103465 |
30.33 |
| 2026-08-19 00:00 |
20:55:52.39 |
-33:10:43.4 |
HIP 103173 |
28.84 |