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 |
1.000 |
| 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) |
| 2026-09-25 00:00 |
17:48:50.96 |
-39:56:05.4 |
HIP 87181 |
2.68 |
| 2026-09-25 12:00 |
17:49:06.75 |
-39:54:16.3 |
HIP 87181 |
4.62 |
| 2026-09-26 00:00 |
17:49:22.77 |
-39:52:27.6 |
HIP 87181 |
7.82 |
| 2026-09-26 12:00 |
17:49:39.03 |
-39:50:39.2 |
HIP 87301 |
8.01 |
| 2026-09-27 00:00 |
17:49:55.51 |
-39:48:51.0 |
HIP 87301 |
4.43 |
| 2026-09-27 12:00 |
17:50:12.22 |
-39:47:03.1 |
HIP 87301 |
1.20 |
| 2026-09-28 00:00 |
17:50:29.16 |
-39:45:15.5 |
HIP 87301 |
3.25 |
| 2026-09-28 12:00 |
17:50:46.32 |
-39:43:28.2 |
HIP 87301 |
6.91 |
| 2026-09-29 00:00 |
17:51:03.71 |
-39:41:41.2 |
HIP 87301 |
10.67 |
| 2026-09-29 12:00 |
17:51:21.32 |
-39:39:54.4 |
HIP 87301 |
14.48 |
| 2026-09-30 00:00 |
17:51:39.16 |
-39:38:08.0 |
HIP 87301 |
18.33 |
| 2026-09-30 12:00 |
17:51:57.21 |
-39:36:21.8 |
HIP 87301 |
22.22 |
| 2026-10-01 00:00 |
17:52:15.49 |
-39:34:35.9 |
HIP 87301 |
26.15 |
| 2026-10-01 12:00 |
17:52:33.98 |
-39:32:50.2 |
HIP 87301 |
30.12 |
| 2026-10-02 00:00 |
17:52:52.69 |
-39:31:04.8 |
HIP 87731 |
27.22 |
| 2026-10-02 12:00 |
17:53:11.62 |
-39:29:19.7 |
HIP 87731 |
23.88 |
| 2026-10-03 00:00 |
17:53:30.76 |
-39:27:34.9 |
HIP 87731 |
20.76 |
| 2026-10-03 12:00 |
17:53:50.12 |
-39:25:50.4 |
HIP 87731 |
17.98 |
| 2026-10-04 00:00 |
17:54:09.69 |
-39:24:06.1 |
HIP 87731 |
15.76 |
| 2026-10-04 12:00 |
17:54:29.47 |
-39:22:22.0 |
HIP 87731 |
14.39 |
| 2026-10-05 00:00 |
17:54:49.47 |
-39:20:38.3 |
HIP 87771 |
11.53 |
| 2026-10-05 12:00 |
17:55:09.67 |
-39:18:54.8 |
HIP 87771 |
7.86 |
| 2026-10-06 00:00 |
17:55:30.08 |
-39:17:11.5 |
HIP 87771 |
5.16 |
| 2026-10-06 12:00 |
17:55:50.70 |
-39:15:28.5 |
HIP 87771 |
5.35 |
| 2026-10-07 00:00 |
17:56:11.53 |
-39:13:45.8 |
HIP 87771 |
8.28 |
| 2026-10-07 12:00 |
17:56:32.56 |
-39:12:03.3 |
HIP 87771 |
12.14 |
| 2026-10-08 00:00 |
17:56:53.80 |
-39:10:21.1 |
HIP 87924 |
10.08 |
| 2026-10-08 12:00 |
17:57:15.24 |
-39:08:39.1 |
HIP 87924 |
5.59 |
| 2026-10-09 00:00 |
17:57:36.88 |
-39:06:57.4 |
HIP 87924 |
1.16 |
| 2026-10-09 12:00 |
17:57:58.72 |
-39:05:15.9 |
HIP 87948 |
2.93 |
| 2026-10-10 00:00 |
17:58:20.76 |
-39:03:34.6 |
HIP 87948 |
6.41 |
| 2026-10-10 12:00 |
17:58:43.00 |
-39:01:53.6 |
HIP 87948 |
10.80 |
| 2026-10-11 00:00 |
17:59:05.43 |
-39:00:12.9 |
HIP 87948 |
15.36 |
| 2026-10-11 12:00 |
17:59:28.06 |
-38:58:32.4 |
HIP 88176 |
18.88 |
| 2026-10-12 00:00 |
17:59:50.89 |
-38:56:52.1 |
HIP 88176 |
14.98 |
| 2026-10-12 12:00 |
18:00:13.90 |
-38:55:12.0 |
HIP 88176 |
11.71 |
| 2026-10-13 00:00 |
18:00:37.11 |
-38:53:32.2 |
HIP 88176 |
9.80 |
| 2026-10-13 12:00 |
18:01:00.50 |
-38:51:52.5 |
HIP 88176 |
10.09 |
| 2026-10-14 00:00 |
18:01:24.09 |
-38:50:13.2 |
HIP 88176 |
12.47 |
| 2026-10-14 12:00 |
18:01:47.86 |
-38:48:34.0 |
HIP 88319 |
11.59 |
| 2026-10-15 00:00 |
18:02:11.81 |
-38:46:55.0 |
HIP 88319 |
8.68 |
| 2026-10-15 12:00 |
18:02:35.95 |
-38:45:16.3 |
HIP 88319 |
8.11 |
| 2026-10-16 00:00 |
18:03:00.28 |
-38:43:37.8 |
HIP 88319 |
10.32 |