メタデータ
| 項目 |
値 |
| Designation |
137P/Shoemaker-Levy 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-12-14T02:22:31.828800Z |
| Orbit solution date (soln_date, UTC) |
2023-05-03T22:44:05Z |
| Obs used |
1224 |
| NEO |
- |
| M1 |
15.400 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-12-03.0000000 |
| e |
0.57205656 |
| q (au) |
1.933328 |
| a (au) |
4.517719 |
| i (deg) |
4.850374 |
| Ω (om, deg) |
233.073318 |
| ω (w, deg) |
140.989437 |
| M (ma, deg) |
246.365120 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
15:19:53.64 |
-18:27:06.5 |
HIP 74926 |
20.48 |
| 2026-05-12 12:00 |
15:19:35.86 |
-18:25:48.7 |
HIP 74926 |
17.82 |
| 2026-05-13 00:00 |
15:19:18.07 |
-18:24:30.8 |
HIP 74926 |
15.95 |
| 2026-05-13 12:00 |
15:19:00.27 |
-18:23:12.7 |
HIP 74906 |
14.18 |
| 2026-05-14 00:00 |
15:18:42.46 |
-18:21:54.4 |
HIP 74906 |
11.33 |
| 2026-05-14 12:00 |
15:18:24.64 |
-18:20:36.0 |
HIP 74906 |
9.73 |
| 2026-05-15 00:00 |
15:18:06.82 |
-18:19:17.4 |
HIP 74906 |
10.01 |
| 2026-05-15 12:00 |
15:17:48.99 |
-18:17:58.6 |
HIP 74906 |
12.04 |
| 2026-05-16 00:00 |
15:17:31.17 |
-18:16:39.8 |
HIP 74906 |
15.14 |
| 2026-05-16 12:00 |
15:17:13.35 |
-18:15:20.8 |
HIP 74906 |
18.77 |
| 2026-05-17 00:00 |
15:16:55.54 |
-18:14:01.7 |
HIP 74906 |
22.69 |
| 2026-05-17 12:00 |
15:16:37.74 |
-18:12:42.6 |
HIP 74728 |
25.39 |
| 2026-05-18 00:00 |
15:16:19.95 |
-18:11:23.3 |
HIP 74728 |
26.35 |
| 2026-05-18 12:00 |
15:16:02.18 |
-18:10:04.0 |
HIP 74593 |
27.25 |
| 2026-05-19 00:00 |
15:15:44.43 |
-18:08:44.7 |
HIP 74593 |
24.80 |
| 2026-05-19 12:00 |
15:15:26.70 |
-18:07:25.3 |
HIP 74593 |
22.96 |
| 2026-05-20 00:00 |
15:15:08.99 |
-18:06:05.9 |
HIP 74600 |
21.67 |
| 2026-05-20 12:00 |
15:14:51.31 |
-18:04:46.5 |
HIP 74600 |
19.12 |
| 2026-05-21 00:00 |
15:14:33.67 |
-18:03:27.1 |
HIP 74600 |
17.34 |
| 2026-05-21 12:00 |
15:14:16.05 |
-18:02:07.6 |
HIP 74600 |
16.56 |
| 2026-05-22 00:00 |
15:13:58.48 |
-18:00:48.2 |
HIP 74600 |
16.92 |
| 2026-05-22 12:00 |
15:13:40.94 |
-17:59:28.9 |
HIP 74600 |
18.35 |
| 2026-05-23 00:00 |
15:13:23.45 |
-17:58:09.5 |
HIP 74412 |
15.40 |
| 2026-05-23 12:00 |
15:13:05.99 |
-17:56:50.3 |
HIP 74412 |
12.75 |
| 2026-05-24 00:00 |
15:12:48.59 |
-17:55:31.1 |
HIP 74412 |
11.22 |
| 2026-05-24 12:00 |
15:12:31.23 |
-17:54:12.0 |
HIP 74412 |
11.26 |
| 2026-05-25 00:00 |
15:12:13.93 |
-17:52:52.9 |
HIP 74412 |
12.85 |
| 2026-05-25 12:00 |
15:11:56.68 |
-17:51:34.0 |
HIP 74310 |
12.62 |
| 2026-05-26 00:00 |
15:11:39.49 |
-17:50:15.2 |
HIP 74310 |
11.44 |
| 2026-05-26 12:00 |
15:11:22.36 |
-17:48:56.5 |
HIP 74310 |
11.80 |
| 2026-05-27 00:00 |
15:11:05.29 |
-17:47:37.9 |
HIP 74310 |
13.57 |
| 2026-05-27 12:00 |
15:10:48.28 |
-17:46:19.5 |
HIP 74310 |
16.28 |
| 2026-05-28 00:00 |
15:10:31.35 |
-17:45:01.3 |
HIP 74232 |
19.00 |
| 2026-05-28 12:00 |
15:10:14.48 |
-17:43:43.2 |
HIP 74232 |
19.72 |
| 2026-05-29 00:00 |
15:09:57.68 |
-17:42:25.3 |
HIP 74172 |
20.52 |
| 2026-05-29 12:00 |
15:09:40.96 |
-17:41:07.6 |
HIP 74172 |
20.38 |
| 2026-05-30 00:00 |
15:09:24.31 |
-17:39:50.1 |
HIP 74172 |
21.08 |
| 2026-05-30 12:00 |
15:09:07.74 |
-17:38:32.8 |
HIP 74172 |
22.54 |
| 2026-05-31 00:00 |
15:08:51.25 |
-17:37:15.7 |
HIP 74172 |
24.61 |
| 2026-05-31 12:00 |
15:08:34.85 |
-17:35:58.9 |
HIP 74172 |
27.14 |
| 2026-06-01 00:00 |
15:08:18.53 |
-17:34:42.3 |
HIP 74172 |
30.01 |
| 2026-06-01 12:00 |
15:08:02.30 |
-17:33:26.0 |
HIP 74172 |
33.12 |
| 2026-06-02 00:00 |
15:07:46.16 |
-17:32:10.0 |
HIP 73928 |
34.01 |