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) |
| 2026-05-12 00:00 |
17:59:44.81 |
-35:20:31.2 |
HIP 88247 |
17.77 |
| 2026-05-12 12:00 |
17:59:33.50 |
-35:21:12.9 |
HIP 88247 |
20.11 |
| 2026-05-13 00:00 |
17:59:22.04 |
-35:21:54.2 |
HIP 87993 |
21.27 |
| 2026-05-13 12:00 |
17:59:10.42 |
-35:22:35.1 |
HIP 87993 |
20.70 |
| 2026-05-14 00:00 |
17:58:58.64 |
-35:23:15.6 |
HIP 87993 |
20.39 |
| 2026-05-14 12:00 |
17:58:46.72 |
-35:23:55.6 |
HIP 87993 |
20.38 |
| 2026-05-15 00:00 |
17:58:34.64 |
-35:24:35.3 |
HIP 87993 |
20.67 |
| 2026-05-15 12:00 |
17:58:22.42 |
-35:25:14.5 |
HIP 87993 |
21.25 |
| 2026-05-16 00:00 |
17:58:10.05 |
-35:25:53.2 |
HIP 87874 |
20.80 |
| 2026-05-16 12:00 |
17:57:57.53 |
-35:26:31.5 |
HIP 87874 |
18.68 |
| 2026-05-17 00:00 |
17:57:44.87 |
-35:27:09.4 |
HIP 87874 |
16.70 |
| 2026-05-17 12:00 |
17:57:32.07 |
-35:27:46.8 |
HIP 87874 |
14.93 |
| 2026-05-18 00:00 |
17:57:19.13 |
-35:28:23.8 |
HIP 87874 |
13.46 |
| 2026-05-18 12:00 |
17:57:06.04 |
-35:29:00.2 |
HIP 87874 |
12.42 |
| 2026-05-19 00:00 |
17:56:52.82 |
-35:29:36.2 |
HIP 87874 |
11.94 |
| 2026-05-19 12:00 |
17:56:39.47 |
-35:30:11.7 |
HIP 87874 |
12.09 |
| 2026-05-20 00:00 |
17:56:25.98 |
-35:30:46.7 |
HIP 87874 |
12.89 |
| 2026-05-20 12:00 |
17:56:12.36 |
-35:31:21.2 |
HIP 87874 |
14.22 |
| 2026-05-21 00:00 |
17:55:58.61 |
-35:31:55.2 |
HIP 87874 |
15.98 |
| 2026-05-21 12:00 |
17:55:44.73 |
-35:32:28.6 |
HIP 87874 |
18.05 |
| 2026-05-22 00:00 |
17:55:30.72 |
-35:33:01.6 |
HIP 87874 |
20.34 |
| 2026-05-22 12:00 |
17:55:16.59 |
-35:33:34.0 |
HIP 87874 |
22.79 |
| 2026-05-23 00:00 |
17:55:02.33 |
-35:34:05.8 |
HIP 87874 |
25.37 |
| 2026-05-23 12:00 |
17:54:47.96 |
-35:34:37.2 |
HIP 87532 |
22.61 |
| 2026-05-24 00:00 |
17:54:33.47 |
-35:35:07.9 |
HIP 87532 |
19.62 |
| 2026-05-24 12:00 |
17:54:18.85 |
-35:35:38.1 |
HIP 87532 |
16.62 |
| 2026-05-25 00:00 |
17:54:04.13 |
-35:36:07.8 |
HIP 87532 |
13.59 |
| 2026-05-25 12:00 |
17:53:49.29 |
-35:36:36.9 |
HIP 87532 |
10.54 |
| 2026-05-26 00:00 |
17:53:34.34 |
-35:37:05.4 |
HIP 87532 |
7.48 |
| 2026-05-26 12:00 |
17:53:19.28 |
-35:37:33.3 |
HIP 87532 |
4.41 |
| 2026-05-27 00:00 |
17:53:04.11 |
-35:38:00.7 |
HIP 87532 |
1.44 |
| 2026-05-27 12:00 |
17:52:48.84 |
-35:38:27.4 |
HIP 87532 |
2.04 |
| 2026-05-28 00:00 |
17:52:33.46 |
-35:38:53.6 |
HIP 87532 |
5.11 |
| 2026-05-28 12:00 |
17:52:17.98 |
-35:39:19.1 |
HIP 87532 |
8.26 |
| 2026-05-29 00:00 |
17:52:02.40 |
-35:39:44.0 |
HIP 87532 |
11.44 |
| 2026-05-29 12:00 |
17:51:46.73 |
-35:40:08.4 |
HIP 87532 |
14.65 |
| 2026-05-30 00:00 |
17:51:30.95 |
-35:40:32.1 |
HIP 87336 |
12.90 |
| 2026-05-30 12:00 |
17:51:15.09 |
-35:40:55.1 |
HIP 87336 |
11.03 |
| 2026-05-31 00:00 |
17:50:59.13 |
-35:41:17.6 |
HIP 87336 |
9.88 |
| 2026-05-31 12:00 |
17:50:43.09 |
-35:41:39.4 |
HIP 87336 |
9.74 |
| 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 |