メタデータ
| 項目 |
値 |
| Designation |
C/1991 T2 (Shoemaker-Levy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-07-24T12:09:31.147200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
212 |
| NEO |
- |
| M1 |
7.800 |
| K1 |
10.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1992-03-10.0000000 |
| e |
0.99986094 |
| q (au) |
0.836262 |
| a (au) |
6013.613507 |
| i (deg) |
113.496746 |
| Ω (om, deg) |
49.049164 |
| ω (w, deg) |
145.238453 |
| M (ma, deg) |
359.999711 |
等級
散乱 + 全体線形
$$
M_a = (8.493 + 3.615\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.493 |
| n |
3.615 |
| gf |
0.800 |
| gb |
-0.594 |
| k |
0.800 |
| δ90 |
2.404 |
| 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 |
| 1991-10-06 |
1992-04-05 |
+3.9104 |
-1.690 |
| 1992-04-05 |
1992-07-24 |
-0.6095 |
+0.014 |
| 1992-07-24 |
1992-08-19 |
+3.5301 |
+0.260 |
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) |
| 2026-03-26 00:00 |
05:04:40.35 |
-20:32:17.6 |
HIP 23631 |
17.67 |
| 2026-03-26 12:00 |
05:04:40.96 |
-20:31:56.3 |
HIP 23631 |
17.30 |
| 2026-03-27 00:00 |
05:04:41.59 |
-20:31:35.0 |
HIP 23631 |
16.93 |
| 2026-03-27 12:00 |
05:04:42.24 |
-20:31:13.9 |
HIP 23631 |
16.57 |
| 2026-03-28 00:00 |
05:04:42.91 |
-20:30:52.7 |
HIP 23631 |
16.20 |
| 2026-03-28 12:00 |
05:04:43.59 |
-20:30:31.6 |
HIP 23631 |
15.83 |
| 2026-03-29 00:00 |
05:04:44.29 |
-20:30:10.6 |
HIP 23631 |
15.47 |
| 2026-03-29 12:00 |
05:04:45.01 |
-20:29:49.6 |
HIP 23631 |
15.11 |
| 2026-03-30 00:00 |
05:04:45.74 |
-20:29:28.7 |
HIP 23631 |
14.75 |
| 2026-03-30 12:00 |
05:04:46.49 |
-20:29:07.8 |
HIP 23631 |
14.39 |
| 2026-03-31 00:00 |
05:04:47.26 |
-20:28:47.0 |
HIP 23631 |
14.04 |
| 2026-03-31 12:00 |
05:04:48.05 |
-20:28:26.2 |
HIP 23631 |
13.68 |
| 2026-04-01 00:00 |
05:04:48.85 |
-20:28:05.5 |
HIP 23631 |
13.33 |
| 2026-04-01 12:00 |
05:04:49.67 |
-20:27:44.9 |
HIP 23631 |
12.99 |
| 2026-04-02 00:00 |
05:04:50.51 |
-20:27:24.3 |
HIP 23631 |
12.65 |
| 2026-04-02 12:00 |
05:04:51.36 |
-20:27:03.8 |
HIP 23631 |
12.31 |
| 2026-04-03 00:00 |
05:04:52.23 |
-20:26:43.4 |
HIP 23631 |
11.98 |
| 2026-04-03 12:00 |
05:04:53.11 |
-20:26:23.0 |
HIP 23631 |
11.65 |
| 2026-04-04 00:00 |
05:04:54.01 |
-20:26:02.7 |
HIP 23631 |
11.33 |
| 2026-04-04 12:00 |
05:04:54.93 |
-20:25:42.4 |
HIP 23631 |
11.02 |
| 2026-04-05 00:00 |
05:04:55.87 |
-20:25:22.2 |
HIP 23631 |
10.71 |
| 2026-04-05 12:00 |
05:04:56.82 |
-20:25:02.1 |
HIP 23631 |
10.41 |
| 2026-04-06 00:00 |
05:04:57.78 |
-20:24:42.1 |
HIP 23631 |
10.12 |
| 2026-04-06 12:00 |
05:04:58.76 |
-20:24:22.1 |
HIP 23631 |
9.84 |
| 2026-04-07 00:00 |
05:04:59.76 |
-20:24:02.2 |
HIP 23631 |
9.57 |
| 2026-04-07 12:00 |
05:05:00.78 |
-20:23:42.4 |
HIP 23631 |
9.31 |
| 2026-04-08 00:00 |
05:05:01.81 |
-20:23:22.7 |
HIP 23631 |
9.07 |
| 2026-04-08 12:00 |
05:05:02.85 |
-20:23:03.0 |
HIP 23631 |
8.84 |
| 2026-04-09 00:00 |
05:05:03.91 |
-20:22:43.4 |
HIP 23631 |
8.63 |
| 2026-04-09 12:00 |
05:05:04.99 |
-20:22:24.0 |
HIP 23631 |
8.44 |
| 2026-04-10 00:00 |
05:05:06.08 |
-20:22:04.5 |
HIP 23631 |
8.26 |
| 2026-04-10 12:00 |
05:05:07.19 |
-20:21:45.2 |
HIP 23631 |
8.10 |
| 2026-04-11 00:00 |
05:05:08.31 |
-20:21:26.0 |
HIP 23631 |
7.97 |
| 2026-04-11 12:00 |
05:05:09.45 |
-20:21:06.8 |
HIP 23631 |
7.86 |
| 2026-04-12 00:00 |
05:05:10.60 |
-20:20:47.7 |
HIP 23631 |
7.77 |
| 2026-04-12 12:00 |
05:05:11.77 |
-20:20:28.8 |
HIP 23631 |
7.71 |
| 2026-04-13 00:00 |
05:05:12.95 |
-20:20:09.9 |
HIP 23631 |
7.67 |
| 2026-04-13 12:00 |
05:05:14.15 |
-20:19:51.1 |
HIP 23631 |
7.66 |
| 2026-04-14 00:00 |
05:05:15.36 |
-20:19:32.4 |
HIP 23631 |
7.68 |
| 2026-04-14 12:00 |
05:05:16.59 |
-20:19:13.7 |
HIP 23631 |
7.72 |
| 2026-04-15 00:00 |
05:05:17.83 |
-20:18:55.2 |
HIP 23631 |
7.79 |
| 2026-04-15 12:00 |
05:05:19.09 |
-20:18:36.8 |
HIP 23631 |
7.89 |
| 2026-04-16 00:00 |
05:05:20.36 |
-20:18:18.5 |
HIP 23631 |
8.01 |