118P/Shoemaker-Levy 4
メタデータ
| 項目 |
値 |
| Designation |
118P/Shoemaker-Levy 4 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-11-22T22:36:34.951680Z |
| Orbit solution date (soln_date, UTC) |
2025-08-01T13:53:05Z |
| Obs used |
1771 |
| NEO |
- |
| M1 |
12.400 |
| K1 |
11.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-06-23.0000000 |
| e |
0.45507750 |
| q (au) |
1.831356 |
| a (au) |
3.360765 |
| i (deg) |
10.093960 |
| Ω (om, deg) |
142.114993 |
| ω (w, deg) |
314.438274 |
| M (ma, deg) |
277.143222 |
等級
散乱 + 全体線形
$$
M_a = (10.603 + 5.506\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.603 |
| n |
5.506 |
| gf |
1.000 |
| gb |
-0.907 |
| k |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2021-05-25 |
2022-11-22 |
+1.8100 |
-0.886 |
| 2022-11-24 |
2024-05-31 |
+0.5960 |
-0.576 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
19:06:54.60 |
-16:47:35.3 |
HIP 93740 |
24.27 |
| 2026-02-03 12:00 |
19:07:21.10 |
-16:46:51.4 |
HIP 93906 |
27.66 |
| 2026-02-04 00:00 |
19:07:47.54 |
-16:46:07.2 |
HIP 94110 |
24.20 |
| 2026-02-04 12:00 |
19:08:13.91 |
-16:45:22.6 |
HIP 94110 |
18.55 |
| 2026-02-05 00:00 |
19:08:40.23 |
-16:44:37.6 |
HIP 94110 |
13.56 |
| 2026-02-05 12:00 |
19:09:06.49 |
-16:43:52.3 |
HIP 94110 |
10.21 |
| 2026-02-06 00:00 |
19:09:32.69 |
-16:43:06.7 |
HIP 94152 |
6.76 |
| 2026-02-06 12:00 |
19:09:58.83 |
-16:42:20.7 |
HIP 94152 |
3.98 |
| 2026-02-07 00:00 |
19:10:24.90 |
-16:41:34.3 |
HIP 94152 |
8.08 |
| 2026-02-07 12:00 |
19:10:50.92 |
-16:40:47.7 |
HIP 94152 |
13.91 |
| 2026-02-08 00:00 |
19:11:16.86 |
-16:40:00.7 |
HIP 94345 |
19.02 |
| 2026-02-08 12:00 |
19:11:42.75 |
-16:39:13.3 |
HIP 94345 |
14.88 |
| 2026-02-09 00:00 |
19:12:08.56 |
-16:38:25.7 |
HIP 94345 |
12.61 |
| 2026-02-09 12:00 |
19:12:34.32 |
-16:37:37.7 |
HIP 94345 |
13.20 |
| 2026-02-10 00:00 |
19:13:00.00 |
-16:36:49.4 |
HIP 94345 |
16.32 |
| 2026-02-10 12:00 |
19:13:25.62 |
-16:36:00.8 |
HIP 94345 |
20.85 |
| 2026-02-11 00:00 |
19:13:51.16 |
-16:35:11.8 |
HIP 94345 |
26.06 |
| 2026-02-11 12:00 |
19:14:16.64 |
-16:34:22.6 |
HIP 94647 |
25.13 |
| 2026-02-12 00:00 |
19:14:42.05 |
-16:33:33.0 |
HIP 94647 |
21.78 |
| 2026-02-12 12:00 |
19:15:07.38 |
-16:32:43.2 |
HIP 94647 |
19.82 |
| 2026-02-13 00:00 |
19:15:32.64 |
-16:31:53.1 |
HIP 94647 |
19.66 |
| 2026-02-13 12:00 |
19:15:57.83 |
-16:31:02.6 |
HIP 94647 |
21.33 |
| 2026-02-14 00:00 |
19:16:22.94 |
-16:30:11.9 |
HIP 94647 |
24.44 |
| 2026-02-14 12:00 |
19:16:47.98 |
-16:29:20.9 |
HIP 94803 |
26.39 |
| 2026-02-15 00:00 |
19:17:12.94 |
-16:28:29.7 |
HIP 94803 |
24.23 |
| 2026-02-15 12:00 |
19:17:37.83 |
-16:27:38.1 |
HIP 94803 |
23.47 |
| 2026-02-16 00:00 |
19:18:02.63 |
-16:26:46.3 |
HIP 94803 |
24.23 |
| 2026-02-16 12:00 |
19:18:27.36 |
-16:25:54.2 |
HIP 94803 |
26.36 |
| 2026-02-17 00:00 |
19:18:52.01 |
-16:25:01.9 |
HIP 94803 |
29.55 |
| 2026-02-17 12:00 |
19:19:16.57 |
-16:24:09.3 |
HIP 94940 |
29.70 |
| 2026-02-18 00:00 |
19:19:41.06 |
-16:23:16.4 |
HIP 94940 |
29.75 |
| 2026-02-18 12:00 |
19:20:05.46 |
-16:22:23.3 |
HIP 94940 |
30.95 |
| 2026-02-19 00:00 |
19:20:29.78 |
-16:21:30.0 |
HIP 95216 |
29.18 |
| 2026-02-19 12:00 |
19:20:54.01 |
-16:20:36.4 |
HIP 95216 |
24.75 |
| 2026-02-20 00:00 |
19:21:18.16 |
-16:19:42.6 |
HIP 95216 |
21.06 |
| 2026-02-20 12:00 |
19:21:42.22 |
-16:18:48.6 |
HIP 95216 |
18.54 |
| 2026-02-21 00:00 |
19:22:06.19 |
-16:17:54.4 |
HIP 95216 |
17.67 |
| 2026-02-21 12:00 |
19:22:30.08 |
-16:17:00.0 |
HIP 95216 |
18.66 |
| 2026-02-22 00:00 |
19:22:53.88 |
-16:16:05.3 |
HIP 95216 |
21.24 |
| 2026-02-22 12:00 |
19:23:17.58 |
-16:15:10.4 |
HIP 95216 |
24.91 |
| 2026-02-23 00:00 |
19:23:41.20 |
-16:14:15.3 |
HIP 95323 |
25.54 |
| 2026-02-23 12:00 |
19:24:04.72 |
-16:13:20.0 |
HIP 95474 |
25.18 |
| 2026-02-24 00:00 |
19:24:28.15 |
-16:12:24.6 |
HIP 95474 |
21.05 |