メタデータ
| 項目 |
値 |
| Designation |
413P/Larson |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-07-19T07:08:45.504960Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T12:12:49Z |
| Obs used |
818 |
| NEO |
- |
| M1 |
14.000 |
| K1 |
9.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-11-25T04:11:40.128000Z |
| Discovery magnitude (MPC) |
20.50 T |
| Discovery observatory (MPC) |
Z84 · Calar Alto-Schmidt |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-01-12.0000000 |
| e |
0.42384746 |
| q (au) |
2.139804 |
| a (au) |
3.713954 |
| i (deg) |
15.984004 |
| Ω (om, deg) |
39.063272 |
| ω (w, deg) |
185.901501 |
| M (ma, deg) |
183.145966 |
等級
散乱 + 全体線形
$$
M_a = (15.069 + 3.557\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.069 |
| n |
3.557 |
| gf |
1.000 |
| gb |
-0.559 |
| 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) |
| 2026-09-20 00:00 |
06:31:14.31 |
+34:30:11.2 |
HIP 31142 |
9.99 |
| 2026-09-20 12:00 |
06:31:31.99 |
+34:31:35.3 |
HIP 31142 |
6.26 |
| 2026-09-21 00:00 |
06:31:49.49 |
+34:32:59.7 |
HIP 31142 |
3.05 |
| 2026-09-21 12:00 |
06:32:06.81 |
+34:34:24.7 |
HIP 31142 |
3.06 |
| 2026-09-22 00:00 |
06:32:23.95 |
+34:35:50.0 |
HIP 31142 |
6.21 |
| 2026-09-22 12:00 |
06:32:40.90 |
+34:37:15.9 |
HIP 31142 |
9.80 |
| 2026-09-23 00:00 |
06:32:57.66 |
+34:38:42.2 |
HIP 31142 |
13.47 |
| 2026-09-23 12:00 |
06:33:14.24 |
+34:40:08.9 |
HIP 31142 |
17.13 |
| 2026-09-24 00:00 |
06:33:30.63 |
+34:41:36.2 |
HIP 31142 |
20.78 |
| 2026-09-24 12:00 |
06:33:46.83 |
+34:43:03.9 |
HIP 31431 |
21.94 |
| 2026-09-25 00:00 |
06:34:02.83 |
+34:44:32.0 |
HIP 31431 |
18.49 |
| 2026-09-25 12:00 |
06:34:18.65 |
+34:46:00.7 |
HIP 31431 |
15.13 |
| 2026-09-26 00:00 |
06:34:34.26 |
+34:47:29.8 |
HIP 31431 |
11.92 |
| 2026-09-26 12:00 |
06:34:49.69 |
+34:48:59.4 |
HIP 31431 |
8.96 |
| 2026-09-27 00:00 |
06:35:04.91 |
+34:50:29.5 |
HIP 31431 |
6.55 |
| 2026-09-27 12:00 |
06:35:19.94 |
+34:52:00.1 |
HIP 31431 |
5.42 |
| 2026-09-28 00:00 |
06:35:34.76 |
+34:53:31.2 |
HIP 31431 |
6.23 |
| 2026-09-28 12:00 |
06:35:49.39 |
+34:55:02.8 |
HIP 31431 |
8.40 |
| 2026-09-29 00:00 |
06:36:03.81 |
+34:56:34.9 |
HIP 31431 |
11.14 |
| 2026-09-29 12:00 |
06:36:18.02 |
+34:58:07.5 |
HIP 31431 |
14.09 |
| 2026-09-30 00:00 |
06:36:32.03 |
+34:59:40.6 |
HIP 31619 |
14.86 |
| 2026-09-30 12:00 |
06:36:45.82 |
+35:01:14.2 |
HIP 31619 |
15.43 |
| 2026-10-01 00:00 |
06:36:59.41 |
+35:02:48.3 |
HIP 31619 |
16.63 |
| 2026-10-01 12:00 |
06:37:12.78 |
+35:04:23.0 |
HIP 31619 |
18.32 |
| 2026-10-02 00:00 |
06:37:25.95 |
+35:05:58.1 |
HIP 31619 |
20.36 |
| 2026-10-02 12:00 |
06:37:38.89 |
+35:07:33.8 |
HIP 31619 |
22.65 |
| 2026-10-03 00:00 |
06:37:51.62 |
+35:09:10.0 |
HIP 31619 |
25.10 |
| 2026-10-03 12:00 |
06:38:04.12 |
+35:10:46.7 |
HIP 31619 |
27.65 |
| 2026-10-04 00:00 |
06:38:16.41 |
+35:12:24.0 |
HIP 31863 |
28.96 |
| 2026-10-04 12:00 |
06:38:28.47 |
+35:14:01.7 |
HIP 31863 |
29.00 |
| 2026-10-05 00:00 |
06:38:40.31 |
+35:15:40.1 |
HIP 31863 |
29.36 |
| 2026-10-05 12:00 |
06:38:51.92 |
+35:17:18.9 |
HIP 31953 |
27.05 |
| 2026-10-06 00:00 |
06:39:03.31 |
+35:18:58.3 |
HIP 31953 |
24.20 |
| 2026-10-06 12:00 |
06:39:14.46 |
+35:20:38.2 |
HIP 31953 |
21.38 |
| 2026-10-07 00:00 |
06:39:25.38 |
+35:22:18.7 |
HIP 31953 |
18.60 |
| 2026-10-07 12:00 |
06:39:36.07 |
+35:23:59.6 |
HIP 31953 |
15.85 |
| 2026-10-08 00:00 |
06:39:46.52 |
+35:25:41.2 |
HIP 31953 |
13.13 |
| 2026-10-08 12:00 |
06:39:56.74 |
+35:27:23.2 |
HIP 31953 |
10.44 |
| 2026-10-09 00:00 |
06:40:06.71 |
+35:29:05.8 |
HIP 31953 |
7.80 |
| 2026-10-09 12:00 |
06:40:16.45 |
+35:30:49.0 |
HIP 31953 |
5.19 |
| 2026-10-10 00:00 |
06:40:25.94 |
+35:32:32.7 |
HIP 31953 |
2.68 |
| 2026-10-10 12:00 |
06:40:35.19 |
+35:34:16.9 |
HIP 31953 |
0.96 |
| 2026-10-11 00:00 |
06:40:44.20 |
+35:36:01.6 |
HIP 31953 |
2.77 |