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) |
| 2026-03-26 00:00 |
03:46:32.72 |
+27:47:20.8 |
HIP 17613 |
2.21 |
| 2026-03-26 12:00 |
03:46:53.87 |
+27:48:16.8 |
HIP 17613 |
6.95 |
| 2026-03-27 00:00 |
03:47:15.14 |
+27:49:13.2 |
HIP 17613 |
11.75 |
| 2026-03-27 12:00 |
03:47:36.54 |
+27:50:10.0 |
HIP 17613 |
16.57 |
| 2026-03-28 00:00 |
03:47:58.07 |
+27:51:07.1 |
HIP 17613 |
21.42 |
| 2026-03-28 12:00 |
03:48:19.71 |
+27:52:04.6 |
HIP 17613 |
26.30 |
| 2026-03-29 00:00 |
03:48:41.48 |
+27:53:02.5 |
HIP 17613 |
31.21 |
| 2026-03-29 12:00 |
03:49:03.37 |
+27:54:00.8 |
HIP 17924 |
30.22 |
| 2026-03-30 00:00 |
03:49:25.38 |
+27:54:59.4 |
HIP 17924 |
29.55 |
| 2026-03-30 12:00 |
03:49:47.51 |
+27:55:58.4 |
HIP 17924 |
29.71 |
| 2026-03-31 00:00 |
03:50:09.75 |
+27:56:57.7 |
HIP 17924 |
30.71 |
| 2026-03-31 12:00 |
03:50:32.12 |
+27:57:57.3 |
HIP 18119 |
27.42 |
| 2026-04-01 00:00 |
03:50:54.60 |
+27:58:57.4 |
HIP 18119 |
22.46 |
| 2026-04-01 12:00 |
03:51:17.19 |
+27:59:57.7 |
HIP 18119 |
17.52 |
| 2026-04-02 00:00 |
03:51:39.91 |
+28:00:58.4 |
HIP 18119 |
12.69 |
| 2026-04-02 12:00 |
03:52:02.73 |
+28:01:59.4 |
HIP 18119 |
8.18 |
| 2026-04-03 00:00 |
03:52:25.67 |
+28:03:00.7 |
HIP 18119 |
5.04 |
| 2026-04-03 12:00 |
03:52:48.72 |
+28:04:02.3 |
HIP 18119 |
6.12 |
| 2026-04-04 00:00 |
03:53:11.89 |
+28:05:04.3 |
HIP 18208 |
6.85 |
| 2026-04-04 12:00 |
03:53:35.16 |
+28:06:06.5 |
HIP 18208 |
2.83 |
| 2026-04-05 00:00 |
03:53:58.55 |
+28:07:09.1 |
HIP 18208 |
4.92 |
| 2026-04-05 12:00 |
03:54:22.04 |
+28:08:11.9 |
HIP 18320 |
8.89 |
| 2026-04-06 00:00 |
03:54:45.64 |
+28:09:15.1 |
HIP 18320 |
3.74 |
| 2026-04-06 12:00 |
03:55:09.36 |
+28:10:18.5 |
HIP 18320 |
2.32 |
| 2026-04-07 00:00 |
03:55:33.17 |
+28:11:22.2 |
HIP 18386 |
3.46 |
| 2026-04-07 12:00 |
03:55:57.10 |
+28:12:26.2 |
HIP 18386 |
2.68 |
| 2026-04-08 00:00 |
03:56:21.13 |
+28:13:30.5 |
HIP 18386 |
7.79 |
| 2026-04-08 12:00 |
03:56:45.27 |
+28:14:35.1 |
HIP 18386 |
13.16 |
| 2026-04-09 00:00 |
03:57:09.51 |
+28:15:39.9 |
HIP 18386 |
18.58 |
| 2026-04-09 12:00 |
03:57:33.85 |
+28:16:45.0 |
HIP 18386 |
24.03 |
| 2026-04-10 00:00 |
03:57:58.30 |
+28:17:50.3 |
HIP 18386 |
29.52 |
| 2026-04-10 12:00 |
03:58:22.85 |
+28:18:55.9 |
HIP 18386 |
35.03 |
| 2026-04-11 00:00 |
03:58:47.50 |
+28:20:01.7 |
HIP 18781 |
36.26 |
| 2026-04-11 12:00 |
03:59:12.25 |
+28:21:07.8 |
HIP 18781 |
30.73 |
| 2026-04-12 00:00 |
03:59:37.10 |
+28:22:14.1 |
HIP 18781 |
25.18 |
| 2026-04-12 12:00 |
04:00:02.05 |
+28:23:20.7 |
HIP 18781 |
19.64 |
| 2026-04-13 00:00 |
04:00:27.10 |
+28:24:27.5 |
HIP 18781 |
14.11 |
| 2026-04-13 12:00 |
04:00:52.24 |
+28:25:34.5 |
HIP 18781 |
8.68 |
| 2026-04-14 00:00 |
04:01:17.49 |
+28:26:41.8 |
HIP 18781 |
3.89 |
| 2026-04-14 12:00 |
04:01:42.82 |
+28:27:49.2 |
HIP 18781 |
4.37 |
| 2026-04-15 00:00 |
04:02:08.26 |
+28:28:56.9 |
HIP 18781 |
9.38 |
| 2026-04-15 12:00 |
04:02:33.79 |
+28:30:04.8 |
HIP 18892 |
6.16 |
| 2026-04-16 00:00 |
04:02:59.41 |
+28:31:12.9 |
HIP 18892 |
3.86 |