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
$$
M_a = (14.912 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.912 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-0.644 |
| k |
0.847 |
| δ90 |
8.808 |
| 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 |
14:47:45.86 |
-16:21:46.0 |
HIP 72292 |
12.36 |
| 2026-03-26 12:00 |
14:47:33.22 |
-16:20:56.6 |
HIP 72292 |
10.51 |
| 2026-03-27 00:00 |
14:47:20.33 |
-16:20:06.1 |
HIP 72292 |
9.35 |
| 2026-03-27 12:00 |
14:47:07.19 |
-16:19:14.3 |
HIP 72292 |
9.23 |
| 2026-03-28 00:00 |
14:46:53.79 |
-16:18:21.4 |
HIP 72292 |
10.25 |
| 2026-03-28 12:00 |
14:46:40.15 |
-16:17:27.3 |
HIP 72292 |
12.17 |
| 2026-03-29 00:00 |
14:46:26.26 |
-16:16:32.1 |
HIP 72292 |
14.69 |
| 2026-03-29 12:00 |
14:46:12.12 |
-16:15:35.7 |
HIP 72292 |
17.58 |
| 2026-03-30 00:00 |
14:45:57.74 |
-16:14:38.1 |
HIP 72292 |
20.73 |
| 2026-03-30 12:00 |
14:45:43.12 |
-16:13:39.4 |
HIP 72292 |
24.05 |
| 2026-03-31 00:00 |
14:45:28.26 |
-16:12:39.5 |
HIP 72292 |
27.52 |
| 2026-03-31 12:00 |
14:45:13.17 |
-16:11:38.6 |
HIP 72292 |
31.09 |
| 2026-04-01 00:00 |
14:44:57.84 |
-16:10:36.5 |
HIP 72292 |
34.77 |
| 2026-04-01 12:00 |
14:44:42.29 |
-16:09:33.2 |
HIP 72161 |
37.35 |
| 2026-04-02 00:00 |
14:44:26.50 |
-16:08:28.9 |
HIP 72161 |
39.78 |
| 2026-04-02 12:00 |
14:44:10.49 |
-16:07:23.4 |
HIP 72161 |
42.49 |
| 2026-04-03 00:00 |
14:43:54.26 |
-16:06:16.9 |
HIP 72161 |
45.43 |
| 2026-04-03 12:00 |
14:43:37.81 |
-16:05:09.2 |
HIP 71743 |
45.42 |
| 2026-04-04 00:00 |
14:43:21.14 |
-16:04:00.5 |
HIP 71743 |
41.70 |
| 2026-04-04 12:00 |
14:43:04.26 |
-16:02:50.7 |
HIP 71743 |
38.02 |
| 2026-04-05 00:00 |
14:42:47.16 |
-16:01:39.9 |
HIP 71743 |
34.43 |
| 2026-04-05 12:00 |
14:42:29.86 |
-16:00:27.9 |
HIP 71743 |
30.96 |
| 2026-04-06 00:00 |
14:42:12.35 |
-15:59:15.0 |
HIP 71743 |
27.70 |
| 2026-04-06 12:00 |
14:41:54.64 |
-15:58:01.0 |
HIP 71743 |
24.76 |
| 2026-04-07 00:00 |
14:41:36.73 |
-15:56:46.0 |
HIP 71743 |
22.29 |
| 2026-04-07 12:00 |
14:41:18.62 |
-15:55:29.9 |
HIP 71743 |
20.51 |
| 2026-04-08 00:00 |
14:41:00.32 |
-15:54:12.9 |
HIP 71743 |
19.63 |
| 2026-04-08 12:00 |
14:40:41.83 |
-15:52:54.8 |
HIP 71743 |
19.80 |
| 2026-04-09 00:00 |
14:40:23.16 |
-15:51:35.8 |
HIP 71713 |
20.81 |
| 2026-04-09 12:00 |
14:40:04.30 |
-15:50:15.8 |
HIP 71713 |
21.86 |
| 2026-04-10 00:00 |
14:39:45.27 |
-15:48:54.9 |
HIP 71713 |
23.85 |
| 2026-04-10 12:00 |
14:39:26.06 |
-15:47:33.0 |
HIP 71713 |
26.58 |
| 2026-04-11 00:00 |
14:39:06.68 |
-15:46:10.2 |
HIP 71713 |
29.88 |
| 2026-04-11 12:00 |
14:38:47.13 |
-15:44:46.4 |
HIP 71713 |
33.60 |
| 2026-04-12 00:00 |
14:38:27.41 |
-15:43:21.8 |
HIP 71715 |
36.77 |
| 2026-04-12 12:00 |
14:38:07.54 |
-15:41:56.3 |
HIP 71715 |
39.19 |
| 2026-04-13 00:00 |
14:37:47.51 |
-15:40:29.9 |
HIP 71715 |
42.09 |
| 2026-04-13 12:00 |
14:37:27.33 |
-15:39:02.6 |
HIP 71567 |
43.11 |
| 2026-04-14 00:00 |
14:37:07.00 |
-15:37:34.5 |
HIP 71567 |
43.22 |
| 2026-04-14 12:00 |
14:36:46.53 |
-15:36:05.6 |
HIP 71220 |
42.46 |
| 2026-04-15 00:00 |
14:36:25.92 |
-15:34:35.9 |
HIP 71220 |
37.81 |
| 2026-04-15 12:00 |
14:36:05.17 |
-15:33:05.4 |
HIP 71220 |
33.29 |
| 2026-04-16 00:00 |
14:35:44.30 |
-15:31:34.1 |
HIP 71220 |
28.97 |