メタデータ
| 項目 |
値 |
| Designation |
374P/Larson |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-12-09T18:00:31.363200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:38Z |
| Obs used |
286 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
23.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-05-22.0000000 |
| e |
0.46250522 |
| q (au) |
2.670592 |
| a (au) |
4.968591 |
| i (deg) |
10.790852 |
| Ω (om, deg) |
8.161322 |
| ω (w, deg) |
51.420244 |
| M (ma, deg) |
112.063968 |
等級
散乱 + 全体線形
$$
M_a = (12.335 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.335 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.533 |
| 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) |
| 2026-06-01 00:00 |
17:50:26.95 |
-35:42:00.6 |
HIP 87336 |
10.65 |
| 2026-06-01 12:00 |
17:50:10.73 |
-35:42:21.1 |
HIP 87336 |
12.40 |
| 2026-06-02 00:00 |
17:49:54.43 |
-35:42:41.0 |
HIP 87336 |
14.70 |
| 2026-06-02 12:00 |
17:49:38.05 |
-35:43:00.2 |
HIP 87336 |
17.35 |
| 2026-06-03 00:00 |
17:49:21.58 |
-35:43:18.8 |
HIP 87140 |
17.03 |
| 2026-06-03 12:00 |
17:49:05.05 |
-35:43:36.7 |
HIP 87140 |
14.31 |
| 2026-06-04 00:00 |
17:48:48.43 |
-35:43:53.9 |
HIP 87140 |
11.92 |
| 2026-06-04 12:00 |
17:48:31.75 |
-35:44:10.5 |
HIP 87140 |
10.12 |
| 2026-06-05 00:00 |
17:48:14.99 |
-35:44:26.4 |
HIP 87140 |
9.28 |
| 2026-06-05 12:00 |
17:47:58.17 |
-35:44:41.6 |
HIP 87063 |
6.61 |
| 2026-06-06 00:00 |
17:47:41.28 |
-35:44:56.1 |
HIP 87063 |
3.90 |
| 2026-06-06 12:00 |
17:47:24.32 |
-35:45:09.9 |
HIP 87063 |
3.19 |
| 2026-06-07 00:00 |
17:47:07.31 |
-35:45:23.1 |
HIP 87063 |
5.38 |
| 2026-06-07 12:00 |
17:46:50.24 |
-35:45:35.6 |
HIP 87063 |
8.48 |
| 2026-06-08 00:00 |
17:46:33.11 |
-35:45:47.3 |
HIP 87063 |
11.79 |
| 2026-06-08 12:00 |
17:46:15.92 |
-35:45:58.4 |
HIP 87063 |
15.18 |
| 2026-06-09 00:00 |
17:45:58.69 |
-35:46:08.8 |
HIP 86880 |
18.31 |
| 2026-06-09 12:00 |
17:45:41.41 |
-35:46:18.4 |
HIP 86880 |
16.47 |
| 2026-06-10 00:00 |
17:45:24.07 |
-35:46:27.4 |
HIP 86880 |
15.23 |
| 2026-06-10 12:00 |
17:45:06.70 |
-35:46:35.6 |
HIP 86880 |
14.73 |
| 2026-06-11 00:00 |
17:44:49.28 |
-35:46:43.2 |
HIP 86880 |
15.05 |
| 2026-06-11 12:00 |
17:44:31.83 |
-35:46:50.0 |
HIP 86880 |
16.15 |
| 2026-06-12 00:00 |
17:44:14.34 |
-35:46:56.1 |
HIP 86880 |
17.90 |
| 2026-06-12 12:00 |
17:43:56.81 |
-35:47:01.5 |
HIP 86653 |
20.05 |
| 2026-06-13 00:00 |
17:43:39.26 |
-35:47:06.1 |
HIP 86653 |
16.49 |
| 2026-06-13 12:00 |
17:43:21.67 |
-35:47:10.1 |
HIP 86653 |
12.93 |
| 2026-06-14 00:00 |
17:43:04.06 |
-35:47:13.3 |
HIP 86653 |
9.37 |
| 2026-06-14 12:00 |
17:42:46.43 |
-35:47:15.8 |
HIP 86653 |
5.81 |
| 2026-06-15 00:00 |
17:42:28.77 |
-35:47:17.6 |
HIP 86653 |
2.31 |
| 2026-06-15 12:00 |
17:42:11.10 |
-35:47:18.6 |
HIP 86653 |
1.60 |
| 2026-06-16 00:00 |
17:41:53.41 |
-35:47:18.9 |
HIP 86653 |
5.05 |
| 2026-06-16 12:00 |
17:41:35.71 |
-35:47:18.5 |
HIP 86653 |
8.62 |
| 2026-06-17 00:00 |
17:41:18.01 |
-35:47:17.4 |
HIP 86500 |
11.90 |
| 2026-06-17 12:00 |
17:41:00.29 |
-35:47:15.6 |
HIP 86500 |
9.67 |
| 2026-06-18 00:00 |
17:40:42.57 |
-35:47:13.0 |
HIP 86500 |
8.42 |
| 2026-06-18 12:00 |
17:40:24.85 |
-35:47:09.7 |
HIP 86500 |
8.61 |
| 2026-06-19 00:00 |
17:40:07.14 |
-35:47:05.7 |
HIP 86500 |
10.14 |
| 2026-06-19 12:00 |
17:39:49.42 |
-35:47:00.9 |
HIP 86500 |
12.55 |
| 2026-06-20 00:00 |
17:39:31.72 |
-35:46:55.5 |
HIP 86500 |
15.41 |
| 2026-06-20 12:00 |
17:39:14.02 |
-35:46:49.3 |
HIP 86500 |
18.53 |
| 2026-06-21 00:00 |
17:38:56.33 |
-35:46:42.4 |
HIP 86238 |
19.25 |
| 2026-06-21 12:00 |
17:38:38.66 |
-35:46:34.8 |
HIP 86238 |
15.70 |
| 2026-06-22 00:00 |
17:38:21.01 |
-35:46:26.4 |
HIP 86238 |
12.17 |