メタデータ
| 項目 |
値 |
| Designation |
474P/Hogan |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-07-19T01:46:21.910080Z |
| Orbit solution date (soln_date, UTC) |
2024-02-21T22:34:49Z |
| Obs used |
120 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
13.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2017-07-30T13:58:23.462400Z |
| Discovery magnitude (MPC) |
23.43 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) |
2021-10-01.0000000 |
| e |
0.18866770 |
| q (au) |
2.538985 |
| a (au) |
3.129402 |
| i (deg) |
1.099891 |
| Ω (om, deg) |
26.750354 |
| ω (w, deg) |
12.093477 |
| M (ma, deg) |
243.194094 |
等級
散乱 + 全体線形
$$
M_a = (14.907 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.907 |
| n |
6.000 |
| gf |
0.993 |
| gb |
-0.644 |
| k |
0.848 |
| δ90 |
9.113 |
| 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) |
| 2026-06-01 00:00 |
14:04:49.59 |
-13:05:07.6 |
HIP 68855 |
16.52 |
| 2026-06-01 12:00 |
14:04:36.14 |
-13:03:59.9 |
HIP 68696 |
18.63 |
| 2026-06-02 00:00 |
14:04:22.94 |
-13:02:53.3 |
HIP 68696 |
17.45 |
| 2026-06-02 12:00 |
14:04:09.98 |
-13:01:47.9 |
HIP 68713 |
16.79 |
| 2026-06-03 00:00 |
14:03:57.26 |
-13:00:43.7 |
HIP 68713 |
15.60 |
| 2026-06-03 12:00 |
14:03:44.78 |
-12:59:40.7 |
HIP 68713 |
15.04 |
| 2026-06-04 00:00 |
14:03:32.55 |
-12:58:39.0 |
HIP 68713 |
15.14 |
| 2026-06-04 12:00 |
14:03:20.57 |
-12:57:38.4 |
HIP 68713 |
15.87 |
| 2026-06-05 00:00 |
14:03:08.84 |
-12:56:39.1 |
HIP 68713 |
17.10 |
| 2026-06-05 12:00 |
14:02:57.35 |
-12:55:41.1 |
HIP 68713 |
18.70 |
| 2026-06-06 00:00 |
14:02:46.12 |
-12:54:44.3 |
HIP 68713 |
20.57 |
| 2026-06-06 12:00 |
14:02:35.13 |
-12:53:48.7 |
HIP 68713 |
22.60 |
| 2026-06-07 00:00 |
14:02:24.40 |
-12:52:54.5 |
HIP 68713 |
24.74 |
| 2026-06-07 12:00 |
14:02:13.93 |
-12:52:01.5 |
HIP 68713 |
26.94 |
| 2026-06-08 00:00 |
14:02:03.71 |
-12:51:09.8 |
HIP 68713 |
29.16 |
| 2026-06-08 12:00 |
14:01:53.75 |
-12:50:19.4 |
HIP 68396 |
27.84 |
| 2026-06-09 00:00 |
14:01:44.04 |
-12:49:30.3 |
HIP 68396 |
25.34 |
| 2026-06-09 12:00 |
14:01:34.60 |
-12:48:42.6 |
HIP 68396 |
22.91 |
| 2026-06-10 00:00 |
14:01:25.41 |
-12:47:56.2 |
HIP 68396 |
20.54 |
| 2026-06-10 12:00 |
14:01:16.49 |
-12:47:11.1 |
HIP 68396 |
18.25 |
| 2026-06-11 00:00 |
14:01:07.83 |
-12:46:27.3 |
HIP 68396 |
16.02 |
| 2026-06-11 12:00 |
14:00:59.43 |
-12:45:44.9 |
HIP 68396 |
13.86 |
| 2026-06-12 00:00 |
14:00:51.29 |
-12:45:03.9 |
HIP 68396 |
11.77 |
| 2026-06-12 12:00 |
14:00:43.42 |
-12:44:24.2 |
HIP 68396 |
9.75 |
| 2026-06-13 00:00 |
14:00:35.81 |
-12:43:46.0 |
HIP 68396 |
7.81 |
| 2026-06-13 12:00 |
14:00:28.47 |
-12:43:09.0 |
HIP 68396 |
5.95 |
| 2026-06-14 00:00 |
14:00:21.40 |
-12:42:33.5 |
HIP 68396 |
4.17 |
| 2026-06-14 12:00 |
14:00:14.60 |
-12:41:59.4 |
HIP 68396 |
2.54 |
| 2026-06-15 00:00 |
14:00:08.06 |
-12:41:26.6 |
HIP 68396 |
1.32 |
| 2026-06-15 12:00 |
14:00:01.79 |
-12:40:55.3 |
HIP 68396 |
1.59 |
| 2026-06-16 00:00 |
13:59:55.79 |
-12:40:25.3 |
HIP 68396 |
2.86 |
| 2026-06-16 12:00 |
13:59:50.06 |
-12:39:56.8 |
HIP 68396 |
4.24 |
| 2026-06-17 00:00 |
13:59:44.60 |
-12:39:29.7 |
HIP 68396 |
5.61 |
| 2026-06-17 12:00 |
13:59:39.41 |
-12:39:04.0 |
HIP 68396 |
6.92 |
| 2026-06-18 00:00 |
13:59:34.49 |
-12:38:39.7 |
HIP 68396 |
8.17 |
| 2026-06-18 12:00 |
13:59:29.84 |
-12:38:16.8 |
HIP 68396 |
9.35 |
| 2026-06-19 00:00 |
13:59:25.46 |
-12:37:55.4 |
HIP 68396 |
10.47 |
| 2026-06-19 12:00 |
13:59:21.35 |
-12:37:35.3 |
HIP 68396 |
11.52 |
| 2026-06-20 00:00 |
13:59:17.51 |
-12:37:16.7 |
HIP 68396 |
12.50 |
| 2026-06-20 12:00 |
13:59:13.94 |
-12:36:59.5 |
HIP 68396 |
13.42 |
| 2026-06-21 00:00 |
13:59:10.64 |
-12:36:43.7 |
HIP 68396 |
14.26 |
| 2026-06-21 12:00 |
13:59:07.60 |
-12:36:29.3 |
HIP 68396 |
15.03 |
| 2026-06-22 00:00 |
13:59:04.84 |
-12:36:16.4 |
HIP 68396 |
15.74 |