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) |
| 2026-03-26 00:00 |
21:11:36.89 |
-30:12:42.2 |
HIP 104673 |
23.59 |
| 2026-03-26 12:00 |
21:11:48.25 |
-30:12:23.6 |
HIP 104673 |
23.33 |
| 2026-03-27 00:00 |
21:11:59.53 |
-30:12:05.4 |
HIP 104673 |
23.33 |
| 2026-03-27 12:00 |
21:12:10.74 |
-30:11:47.8 |
HIP 104673 |
23.57 |
| 2026-03-28 00:00 |
21:12:21.87 |
-30:11:30.7 |
HIP 104673 |
24.05 |
| 2026-03-28 12:00 |
21:12:32.93 |
-30:11:14.1 |
HIP 104673 |
24.74 |
| 2026-03-29 00:00 |
21:12:43.91 |
-30:10:58.0 |
HIP 104673 |
25.63 |
| 2026-03-29 12:00 |
21:12:54.81 |
-30:10:42.4 |
HIP 104673 |
26.68 |
| 2026-03-30 00:00 |
21:13:05.64 |
-30:10:27.4 |
HIP 104673 |
27.89 |
| 2026-03-30 12:00 |
21:13:16.38 |
-30:10:12.9 |
HIP 104673 |
29.21 |
| 2026-03-31 00:00 |
21:13:27.05 |
-30:09:58.9 |
HIP 104673 |
30.64 |
| 2026-03-31 12:00 |
21:13:37.64 |
-30:09:45.4 |
HIP 104809 |
30.40 |
| 2026-04-01 00:00 |
21:13:48.15 |
-30:09:32.4 |
HIP 104809 |
29.88 |
| 2026-04-01 12:00 |
21:13:58.58 |
-30:09:20.0 |
HIP 104809 |
29.53 |
| 2026-04-02 00:00 |
21:14:08.92 |
-30:09:08.0 |
HIP 104809 |
29.37 |
| 2026-04-02 12:00 |
21:14:19.19 |
-30:08:56.7 |
HIP 105026 |
27.89 |
| 2026-04-03 00:00 |
21:14:29.37 |
-30:08:45.8 |
HIP 105026 |
25.85 |
| 2026-04-03 12:00 |
21:14:39.47 |
-30:08:35.5 |
HIP 105026 |
23.85 |
| 2026-04-04 00:00 |
21:14:49.49 |
-30:08:25.7 |
HIP 105026 |
21.90 |
| 2026-04-04 12:00 |
21:14:59.42 |
-30:08:16.4 |
HIP 105026 |
20.02 |
| 2026-04-05 00:00 |
21:15:09.27 |
-30:08:07.7 |
HIP 105026 |
18.20 |
| 2026-04-05 12:00 |
21:15:19.04 |
-30:07:59.5 |
HIP 105026 |
16.47 |
| 2026-04-06 00:00 |
21:15:28.72 |
-30:07:51.9 |
HIP 105026 |
14.85 |
| 2026-04-06 12:00 |
21:15:38.31 |
-30:07:44.8 |
HIP 105026 |
13.36 |
| 2026-04-07 00:00 |
21:15:47.82 |
-30:07:38.2 |
HIP 105026 |
12.06 |
| 2026-04-07 12:00 |
21:15:57.24 |
-30:07:32.2 |
HIP 105026 |
10.99 |
| 2026-04-08 00:00 |
21:16:06.57 |
-30:07:26.8 |
HIP 105026 |
10.22 |
| 2026-04-08 12:00 |
21:16:15.81 |
-30:07:21.9 |
HIP 105026 |
9.80 |
| 2026-04-09 00:00 |
21:16:24.97 |
-30:07:17.5 |
HIP 105026 |
9.77 |
| 2026-04-09 12:00 |
21:16:34.04 |
-30:07:13.7 |
HIP 105026 |
10.12 |
| 2026-04-10 00:00 |
21:16:43.01 |
-30:07:10.4 |
HIP 105026 |
10.81 |
| 2026-04-10 12:00 |
21:16:51.90 |
-30:07:07.7 |
HIP 105026 |
11.76 |
| 2026-04-11 00:00 |
21:17:00.69 |
-30:07:05.6 |
HIP 105026 |
12.91 |
| 2026-04-11 12:00 |
21:17:09.40 |
-30:07:04.0 |
HIP 105026 |
14.19 |
| 2026-04-12 00:00 |
21:17:18.01 |
-30:07:03.0 |
HIP 105026 |
15.58 |
| 2026-04-12 12:00 |
21:17:26.53 |
-30:07:02.5 |
HIP 105026 |
17.04 |
| 2026-04-13 00:00 |
21:17:34.95 |
-30:07:02.6 |
HIP 105026 |
18.54 |
| 2026-04-13 12:00 |
21:17:43.28 |
-30:07:03.3 |
HIP 105026 |
20.08 |
| 2026-04-14 00:00 |
21:17:51.52 |
-30:07:04.5 |
HIP 105252 |
20.19 |
| 2026-04-14 12:00 |
21:17:59.66 |
-30:07:06.3 |
HIP 105252 |
18.73 |
| 2026-04-15 00:00 |
21:18:07.71 |
-30:07:08.7 |
HIP 105252 |
17.33 |
| 2026-04-15 12:00 |
21:18:15.65 |
-30:07:11.6 |
HIP 105252 |
16.01 |
| 2026-04-16 00:00 |
21:18:23.51 |
-30:07:15.2 |
HIP 105252 |
14.78 |