C/1991 B1 (Shoemaker-Levy)
メタデータ
| 項目 |
値 |
| Designation |
C/1991 B1 (Shoemaker-Levy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1991-12-31T04:34:48.403200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:40Z |
| Obs used |
429 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
9.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1992-05-14.0000000 |
| e |
0.99357570 |
| q (au) |
2.265069 |
| a (au) |
352.578443 |
| i (deg) |
77.287941 |
| Ω (om, deg) |
145.130159 |
| ω (w, deg) |
74.368785 |
| M (ma, deg) |
0.020070 |
等級
散乱 + 全体線形
$$
M_a = (3.416 + 5.065\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.416 |
| n |
5.065 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 1991-01-13 |
1991-03-15 |
+11.0750 |
-6.905 |
| 1991-03-15 |
1991-12-31 |
-2.4398 |
+1.131 |
| 1992-01-01 |
1992-06-26 |
+4.2282 |
-1.567 |
| 1992-06-26 |
1993-10-08 |
-3.6144 |
+1.867 |
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 |
00:38:01.85 |
-51:46:28.0 |
HIP 3154 |
19.35 |
| 2026-02-03 12:00 |
00:38:03.70 |
-51:46:02.8 |
HIP 3154 |
19.03 |
| 2026-02-04 00:00 |
00:38:05.56 |
-51:45:37.6 |
HIP 3154 |
18.72 |
| 2026-02-04 12:00 |
00:38:07.45 |
-51:45:12.6 |
HIP 3154 |
18.41 |
| 2026-02-05 00:00 |
00:38:09.36 |
-51:44:47.6 |
HIP 3154 |
18.11 |
| 2026-02-05 12:00 |
00:38:11.30 |
-51:44:22.7 |
HIP 3154 |
17.82 |
| 2026-02-06 00:00 |
00:38:13.25 |
-51:43:57.8 |
HIP 3154 |
17.53 |
| 2026-02-06 12:00 |
00:38:15.23 |
-51:43:33.1 |
HIP 3154 |
17.24 |
| 2026-02-07 00:00 |
00:38:17.22 |
-51:43:08.5 |
HIP 3154 |
16.97 |
| 2026-02-07 12:00 |
00:38:19.24 |
-51:42:43.9 |
HIP 3154 |
16.70 |
| 2026-02-08 00:00 |
00:38:21.28 |
-51:42:19.5 |
HIP 3154 |
16.44 |
| 2026-02-08 12:00 |
00:38:23.34 |
-51:41:55.1 |
HIP 3154 |
16.19 |
| 2026-02-09 00:00 |
00:38:25.42 |
-51:41:30.8 |
HIP 3154 |
15.95 |
| 2026-02-09 12:00 |
00:38:27.52 |
-51:41:06.7 |
HIP 3154 |
15.72 |
| 2026-02-10 00:00 |
00:38:29.64 |
-51:40:42.6 |
HIP 3154 |
15.50 |
| 2026-02-10 12:00 |
00:38:31.78 |
-51:40:18.6 |
HIP 3154 |
15.29 |
| 2026-02-11 00:00 |
00:38:33.94 |
-51:39:54.8 |
HIP 3154 |
15.10 |
| 2026-02-11 12:00 |
00:38:36.12 |
-51:39:31.0 |
HIP 3154 |
14.91 |
| 2026-02-12 00:00 |
00:38:38.32 |
-51:39:07.3 |
HIP 3154 |
14.74 |
| 2026-02-12 12:00 |
00:38:40.54 |
-51:38:43.8 |
HIP 3154 |
14.57 |
| 2026-02-13 00:00 |
00:38:42.78 |
-51:38:20.4 |
HIP 3154 |
14.43 |
| 2026-02-13 12:00 |
00:38:45.04 |
-51:37:57.1 |
HIP 3154 |
14.29 |
| 2026-02-14 00:00 |
00:38:47.32 |
-51:37:33.8 |
HIP 3154 |
14.18 |
| 2026-02-14 12:00 |
00:38:49.61 |
-51:37:10.8 |
HIP 3154 |
14.07 |
| 2026-02-15 00:00 |
00:38:51.93 |
-51:36:47.8 |
HIP 3154 |
13.98 |
| 2026-02-15 12:00 |
00:38:54.26 |
-51:36:24.9 |
HIP 3154 |
13.91 |
| 2026-02-16 00:00 |
00:38:56.61 |
-51:36:02.2 |
HIP 3154 |
13.85 |
| 2026-02-16 12:00 |
00:38:58.98 |
-51:35:39.6 |
HIP 3154 |
13.81 |
| 2026-02-17 00:00 |
00:39:01.37 |
-51:35:17.1 |
HIP 3154 |
13.79 |
| 2026-02-17 12:00 |
00:39:03.77 |
-51:34:54.8 |
HIP 3154 |
13.78 |
| 2026-02-18 00:00 |
00:39:06.19 |
-51:34:32.5 |
HIP 3154 |
13.79 |
| 2026-02-18 12:00 |
00:39:08.63 |
-51:34:10.4 |
HIP 3154 |
13.81 |
| 2026-02-19 00:00 |
00:39:11.09 |
-51:33:48.5 |
HIP 3154 |
13.86 |
| 2026-02-19 12:00 |
00:39:13.56 |
-51:33:26.6 |
HIP 3154 |
13.91 |
| 2026-02-20 00:00 |
00:39:16.05 |
-51:33:04.9 |
HIP 3154 |
13.99 |
| 2026-02-20 12:00 |
00:39:18.56 |
-51:32:43.4 |
HIP 3154 |
14.08 |
| 2026-02-21 00:00 |
00:39:21.08 |
-51:32:22.0 |
HIP 3154 |
14.19 |
| 2026-02-21 12:00 |
00:39:23.62 |
-51:32:00.7 |
HIP 3154 |
14.31 |
| 2026-02-22 00:00 |
00:39:26.18 |
-51:31:39.5 |
HIP 3154 |
14.45 |
| 2026-02-22 12:00 |
00:39:28.75 |
-51:31:18.5 |
HIP 3154 |
14.60 |
| 2026-02-23 00:00 |
00:39:31.33 |
-51:30:57.7 |
HIP 3154 |
14.77 |
| 2026-02-23 12:00 |
00:39:33.93 |
-51:30:37.0 |
HIP 3213 |
14.52 |
| 2026-02-24 00:00 |
00:39:36.55 |
-51:30:16.4 |
HIP 3213 |
13.99 |