メタデータ
| 項目 |
値 |
| Designation |
393P/Spacewatch-Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-05-26T09:40:17.238720Z |
| Orbit solution date (soln_date, UTC) |
2024-02-20T23:48:44Z |
| Obs used |
140 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
16.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-09-24T06:56:17.376000Z |
| Discovery magnitude (MPC) |
21.50 r |
| Discovery observatory (MPC) |
807 · Cerro Tololo Observatory, La Serena |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-12-17.0000000 |
| e |
0.11963494 |
| q (au) |
4.202481 |
| a (au) |
4.773566 |
| i (deg) |
16.807080 |
| Ω (om, deg) |
36.411015 |
| ω (w, deg) |
328.592400 |
| M (ma, deg) |
88.321023 |
等級
散乱 + 全体線形
$$
M_a = (14.412 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.412 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.501 |
| k |
1.000 |
| 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) |
| 2026-09-20 00:00 |
14:35:12.61 |
-19:07:01.1 |
HIP 71242 |
28.33 |
| 2026-09-20 12:00 |
14:35:34.67 |
-19:09:07.5 |
HIP 71242 |
29.77 |
| 2026-09-21 00:00 |
14:35:56.82 |
-19:11:14.2 |
HIP 71242 |
32.16 |
| 2026-09-21 12:00 |
14:36:19.06 |
-19:13:21.2 |
HIP 71242 |
35.31 |
| 2026-09-22 00:00 |
14:36:41.38 |
-19:15:28.5 |
HIP 71242 |
39.05 |
| 2026-09-22 12:00 |
14:37:03.80 |
-19:17:36.0 |
HIP 71242 |
43.22 |
| 2026-09-23 00:00 |
14:37:26.30 |
-19:19:43.8 |
HIP 71614 |
41.37 |
| 2026-09-23 12:00 |
14:37:48.89 |
-19:21:51.9 |
HIP 71614 |
37.22 |
| 2026-09-24 00:00 |
14:38:11.57 |
-19:24:00.2 |
HIP 71614 |
33.53 |
| 2026-09-24 12:00 |
14:38:34.33 |
-19:26:08.8 |
HIP 71614 |
30.49 |
| 2026-09-25 00:00 |
14:38:57.17 |
-19:28:17.6 |
HIP 71614 |
28.30 |
| 2026-09-25 12:00 |
14:39:20.11 |
-19:30:26.7 |
HIP 71614 |
27.19 |
| 2026-09-26 00:00 |
14:39:43.12 |
-19:32:36.0 |
HIP 71614 |
27.31 |
| 2026-09-26 12:00 |
14:40:06.22 |
-19:34:45.6 |
HIP 71816 |
28.01 |
| 2026-09-27 00:00 |
14:40:29.40 |
-19:36:55.4 |
HIP 71816 |
22.92 |
| 2026-09-27 12:00 |
14:40:52.66 |
-19:39:05.5 |
HIP 71816 |
18.28 |
| 2026-09-28 00:00 |
14:41:16.00 |
-19:41:15.8 |
HIP 71816 |
14.58 |
| 2026-09-28 12:00 |
14:41:39.42 |
-19:43:26.3 |
HIP 71816 |
12.67 |
| 2026-09-29 00:00 |
14:42:02.93 |
-19:45:37.0 |
HIP 71816 |
13.38 |
| 2026-09-29 12:00 |
14:42:26.51 |
-19:47:48.0 |
HIP 71816 |
16.39 |
| 2026-09-30 00:00 |
14:42:50.18 |
-19:49:59.2 |
HIP 71816 |
20.73 |
| 2026-09-30 12:00 |
14:43:13.92 |
-19:52:10.6 |
HIP 71816 |
25.75 |
| 2026-10-01 00:00 |
14:43:37.74 |
-19:54:22.2 |
HIP 71816 |
31.14 |
| 2026-10-01 12:00 |
14:44:01.64 |
-19:56:34.0 |
HIP 72148 |
29.79 |
| 2026-10-02 00:00 |
14:44:25.62 |
-19:58:46.0 |
HIP 72148 |
24.58 |
| 2026-10-02 12:00 |
14:44:49.67 |
-20:00:58.2 |
HIP 72148 |
19.84 |
| 2026-10-03 00:00 |
14:45:13.80 |
-20:03:10.6 |
HIP 72148 |
16.00 |
| 2026-10-03 12:00 |
14:45:38.00 |
-20:05:23.2 |
HIP 72148 |
13.88 |
| 2026-10-04 00:00 |
14:46:02.28 |
-20:07:36.0 |
HIP 72148 |
14.27 |
| 2026-10-04 12:00 |
14:46:26.64 |
-20:09:48.9 |
HIP 72148 |
17.02 |
| 2026-10-05 00:00 |
14:46:51.07 |
-20:12:02.1 |
HIP 72148 |
21.24 |
| 2026-10-05 12:00 |
14:47:15.57 |
-20:14:15.4 |
HIP 72405 |
22.08 |
| 2026-10-06 00:00 |
14:47:40.15 |
-20:16:28.9 |
HIP 72405 |
16.83 |
| 2026-10-06 12:00 |
14:48:04.80 |
-20:18:42.6 |
HIP 72405 |
12.45 |
| 2026-10-07 00:00 |
14:48:29.52 |
-20:20:56.4 |
HIP 72405 |
10.18 |
| 2026-10-07 12:00 |
14:48:54.31 |
-20:23:10.5 |
HIP 72405 |
11.37 |
| 2026-10-08 00:00 |
14:49:19.17 |
-20:25:24.6 |
HIP 72405 |
15.26 |
| 2026-10-08 12:00 |
14:49:44.10 |
-20:27:38.9 |
HIP 72405 |
20.37 |
| 2026-10-09 00:00 |
14:50:09.10 |
-20:29:53.4 |
HIP 72692 |
23.51 |
| 2026-10-09 12:00 |
14:50:34.17 |
-20:32:08.0 |
HIP 72692 |
17.25 |
| 2026-10-10 00:00 |
14:50:59.31 |
-20:34:22.7 |
HIP 72692 |
10.99 |
| 2026-10-10 12:00 |
14:51:24.51 |
-20:36:37.6 |
HIP 72692 |
4.81 |
| 2026-10-11 00:00 |
14:51:49.78 |
-20:38:52.6 |
HIP 72692 |
2.31 |