メタデータ
| 項目 |
値 |
| Designation |
385P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-11-09T10:11:43.048320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:41Z |
| Obs used |
353 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
25.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-08-02T01:14:10.464000Z |
| Discovery magnitude (MPC) |
20.40 T |
| Discovery observatory (MPC) |
461 · University of Szeged, Piszkéstető Stn. (Konkoly) |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-11-22.0000000 |
| e |
0.40226883 |
| q (au) |
2.555233 |
| a (au) |
4.274887 |
| i (deg) |
16.855651 |
| Ω (om, deg) |
357.157345 |
| ω (w, deg) |
44.328792 |
| M (ma, deg) |
82.916702 |
等級
散乱 + 全体線形
$$
M_a = (18.057 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.057 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.644 |
| 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 |
18:37:19.74 |
-40:12:43.4 |
HIP 91330 |
17.17 |
| 2026-03-26 12:00 |
18:37:34.30 |
-40:14:09.3 |
HIP 91330 |
15.31 |
| 2026-03-27 00:00 |
18:37:48.65 |
-40:15:35.6 |
HIP 91330 |
13.89 |
| 2026-03-27 12:00 |
18:38:02.80 |
-40:17:02.3 |
HIP 91330 |
13.05 |
| 2026-03-28 00:00 |
18:38:16.74 |
-40:18:29.5 |
HIP 91330 |
12.86 |
| 2026-03-28 12:00 |
18:38:30.48 |
-40:19:57.1 |
HIP 91412 |
12.90 |
| 2026-03-29 00:00 |
18:38:44.00 |
-40:21:25.1 |
HIP 91412 |
11.47 |
| 2026-03-29 12:00 |
18:38:57.32 |
-40:22:53.5 |
HIP 91412 |
10.67 |
| 2026-03-30 00:00 |
18:39:10.42 |
-40:24:22.4 |
HIP 91412 |
10.61 |
| 2026-03-30 12:00 |
18:39:23.32 |
-40:25:51.7 |
HIP 91412 |
11.28 |
| 2026-03-31 00:00 |
18:39:36.00 |
-40:27:21.4 |
HIP 91412 |
12.55 |
| 2026-03-31 12:00 |
18:39:48.47 |
-40:28:51.5 |
HIP 91412 |
14.23 |
| 2026-04-01 00:00 |
18:40:00.72 |
-40:30:22.1 |
HIP 91412 |
16.19 |
| 2026-04-01 12:00 |
18:40:12.75 |
-40:31:53.1 |
HIP 91412 |
18.31 |
| 2026-04-02 00:00 |
18:40:24.57 |
-40:33:24.5 |
HIP 91412 |
20.54 |
| 2026-04-02 12:00 |
18:40:36.16 |
-40:34:56.3 |
HIP 91737 |
20.86 |
| 2026-04-03 00:00 |
18:40:47.54 |
-40:36:28.6 |
HIP 91737 |
18.69 |
| 2026-04-03 12:00 |
18:40:58.69 |
-40:38:01.2 |
HIP 91737 |
16.70 |
| 2026-04-04 00:00 |
18:41:09.62 |
-40:39:34.3 |
HIP 91737 |
14.96 |
| 2026-04-04 12:00 |
18:41:20.33 |
-40:41:07.8 |
HIP 91737 |
13.54 |
| 2026-04-05 00:00 |
18:41:30.81 |
-40:42:41.7 |
HIP 91737 |
12.52 |
| 2026-04-05 12:00 |
18:41:41.07 |
-40:44:16.0 |
HIP 91737 |
12.00 |
| 2026-04-06 00:00 |
18:41:51.09 |
-40:45:50.7 |
HIP 91737 |
12.02 |
| 2026-04-06 12:00 |
18:42:00.89 |
-40:47:25.9 |
HIP 91737 |
12.56 |
| 2026-04-07 00:00 |
18:42:10.45 |
-40:49:01.4 |
HIP 91807 |
13.15 |
| 2026-04-07 12:00 |
18:42:19.78 |
-40:50:37.3 |
HIP 91807 |
12.67 |
| 2026-04-08 00:00 |
18:42:28.88 |
-40:52:13.7 |
HIP 91807 |
12.67 |
| 2026-04-08 12:00 |
18:42:37.74 |
-40:53:50.4 |
HIP 91807 |
13.12 |
| 2026-04-09 00:00 |
18:42:46.36 |
-40:55:27.5 |
HIP 91874 |
13.67 |
| 2026-04-09 12:00 |
18:42:54.75 |
-40:57:05.0 |
HIP 91874 |
13.42 |
| 2026-04-10 00:00 |
18:43:02.90 |
-40:58:42.9 |
HIP 91874 |
13.58 |
| 2026-04-10 12:00 |
18:43:10.81 |
-41:00:21.2 |
HIP 91874 |
14.13 |
| 2026-04-11 00:00 |
18:43:18.47 |
-41:01:59.9 |
HIP 91874 |
15.02 |
| 2026-04-11 12:00 |
18:43:25.89 |
-41:03:38.9 |
HIP 91874 |
16.17 |
| 2026-04-12 00:00 |
18:43:33.07 |
-41:05:18.3 |
HIP 91874 |
17.53 |
| 2026-04-12 12:00 |
18:43:40.00 |
-41:06:58.1 |
HIP 91874 |
19.04 |
| 2026-04-13 00:00 |
18:43:46.69 |
-41:08:38.2 |
HIP 91956 |
20.09 |
| 2026-04-13 12:00 |
18:43:53.12 |
-41:10:18.7 |
HIP 91956 |
18.04 |
| 2026-04-14 00:00 |
18:43:59.31 |
-41:11:59.6 |
HIP 91956 |
16.00 |
| 2026-04-14 12:00 |
18:44:05.24 |
-41:13:40.7 |
HIP 91956 |
13.99 |
| 2026-04-15 00:00 |
18:44:10.92 |
-41:15:22.3 |
HIP 91956 |
12.00 |
| 2026-04-15 12:00 |
18:44:16.35 |
-41:17:04.1 |
HIP 91956 |
10.03 |
| 2026-04-16 00:00 |
18:44:21.53 |
-41:18:46.3 |
HIP 91956 |
8.07 |