メタデータ
| 項目 |
値 |
| Designation |
458P/Jahn |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-10-30T01:02:09.162240Z |
| Orbit solution date (soln_date, UTC) |
2023-04-26T18:45:19Z |
| Obs used |
65 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
22.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2016-02-10T13:20:07.814400Z |
| Discovery magnitude (MPC) |
23.98 G |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-03-22.0000000 |
| e |
0.31500840 |
| q (au) |
2.645016 |
| a (au) |
3.861384 |
| i (deg) |
13.606395 |
| Ω (om, deg) |
1.625135 |
| ω (w, deg) |
104.364729 |
| M (ma, deg) |
236.335161 |
等級
散乱 + 全体線形
$$
M_a = (14.803 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.803 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.696 |
| 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 |
18:53:06.51 |
-39:07:34.6 |
HIP 92508 |
23.02 |
| 2026-07-29 12:00 |
18:52:47.04 |
-39:07:00.5 |
HIP 92508 |
19.38 |
| 2026-07-30 00:00 |
18:52:27.74 |
-39:06:25.3 |
HIP 92508 |
15.85 |
| 2026-07-30 12:00 |
18:52:08.59 |
-39:05:48.9 |
HIP 92508 |
12.51 |
| 2026-07-31 00:00 |
18:51:49.60 |
-39:05:11.3 |
HIP 92508 |
9.54 |
| 2026-07-31 12:00 |
18:51:30.78 |
-39:04:32.6 |
HIP 92508 |
7.33 |
| 2026-08-01 00:00 |
18:51:12.13 |
-39:03:52.8 |
HIP 92508 |
6.65 |
| 2026-08-01 12:00 |
18:50:53.65 |
-39:03:11.8 |
HIP 92508 |
7.86 |
| 2026-08-02 00:00 |
18:50:35.35 |
-39:02:29.8 |
HIP 92508 |
10.29 |
| 2026-08-02 12:00 |
18:50:17.21 |
-39:01:46.6 |
HIP 92508 |
13.26 |
| 2026-08-03 00:00 |
18:49:59.26 |
-39:01:02.4 |
HIP 92508 |
16.46 |
| 2026-08-03 12:00 |
18:49:41.49 |
-39:00:17.1 |
HIP 92508 |
19.77 |
| 2026-08-04 00:00 |
18:49:23.90 |
-38:59:30.8 |
HIP 92415 |
22.54 |
| 2026-08-04 12:00 |
18:49:06.50 |
-38:58:43.4 |
HIP 92186 |
23.07 |
| 2026-08-05 00:00 |
18:48:49.29 |
-38:57:55.0 |
HIP 92186 |
19.69 |
| 2026-08-05 12:00 |
18:48:32.27 |
-38:57:05.5 |
HIP 92186 |
16.37 |
| 2026-08-06 00:00 |
18:48:15.45 |
-38:56:15.0 |
HIP 92186 |
13.12 |
| 2026-08-06 12:00 |
18:47:58.82 |
-38:55:23.5 |
HIP 92186 |
9.97 |
| 2026-08-07 00:00 |
18:47:42.38 |
-38:54:31.1 |
HIP 92186 |
7.02 |
| 2026-08-07 12:00 |
18:47:26.15 |
-38:53:37.6 |
HIP 92186 |
4.60 |
| 2026-08-08 00:00 |
18:47:10.13 |
-38:52:43.2 |
HIP 92186 |
3.78 |
| 2026-08-08 12:00 |
18:46:54.30 |
-38:51:47.8 |
HIP 92186 |
5.30 |
| 2026-08-09 00:00 |
18:46:38.69 |
-38:50:51.5 |
HIP 92186 |
7.87 |
| 2026-08-09 12:00 |
18:46:23.29 |
-38:49:54.2 |
HIP 92092 |
7.59 |
| 2026-08-10 00:00 |
18:46:08.10 |
-38:48:56.0 |
HIP 92092 |
5.99 |
| 2026-08-10 12:00 |
18:45:53.12 |
-38:47:56.9 |
HIP 92092 |
5.76 |
| 2026-08-11 00:00 |
18:45:38.36 |
-38:46:56.9 |
HIP 92092 |
6.99 |
| 2026-08-11 12:00 |
18:45:23.82 |
-38:45:56.0 |
HIP 92092 |
9.07 |
| 2026-08-12 00:00 |
18:45:09.50 |
-38:44:54.3 |
HIP 92092 |
11.53 |
| 2026-08-12 12:00 |
18:44:55.41 |
-38:43:51.7 |
HIP 92092 |
14.14 |
| 2026-08-13 00:00 |
18:44:41.53 |
-38:42:48.2 |
HIP 91827 |
16.43 |
| 2026-08-13 12:00 |
18:44:27.89 |
-38:41:43.9 |
HIP 91827 |
13.57 |
| 2026-08-14 00:00 |
18:44:14.47 |
-38:40:38.8 |
HIP 91827 |
10.75 |
| 2026-08-14 12:00 |
18:44:01.29 |
-38:39:32.9 |
HIP 91827 |
7.98 |
| 2026-08-15 00:00 |
18:43:48.33 |
-38:38:26.2 |
HIP 91827 |
5.28 |
| 2026-08-15 12:00 |
18:43:35.61 |
-38:37:18.7 |
HIP 91827 |
2.77 |
| 2026-08-16 00:00 |
18:43:23.12 |
-38:36:10.4 |
HIP 91827 |
1.52 |
| 2026-08-16 12:00 |
18:43:10.87 |
-38:35:01.4 |
HIP 91827 |
3.37 |
| 2026-08-17 00:00 |
18:42:58.85 |
-38:33:51.7 |
HIP 91827 |
5.84 |
| 2026-08-17 12:00 |
18:42:47.08 |
-38:32:41.2 |
HIP 91827 |
8.38 |
| 2026-08-18 00:00 |
18:42:35.54 |
-38:31:30.0 |
HIP 91827 |
10.91 |
| 2026-08-18 12:00 |
18:42:24.24 |
-38:30:18.1 |
HIP 91827 |
13.41 |
| 2026-08-19 00:00 |
18:42:13.19 |
-38:29:05.6 |
HIP 91747 |
12.81 |