メタデータ
| 項目 |
値 |
| Designation |
C/1991 L3 (Levy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1991-07-08T04:44:18.885120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
136 |
| NEO |
Yes |
| M1 |
8.900 |
| K1 |
14.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1991-12-29.0000000 |
| e |
0.92885840 |
| q (au) |
0.982684 |
| a (au) |
13.813077 |
| i (deg) |
19.190108 |
| Ω (om, deg) |
329.431597 |
| ω (w, deg) |
41.478818 |
| M (ma, deg) |
3.336757 |
等級
散乱 + 全体線形
$$
M_a = (7.810 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.810 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1991-07-08 |
1991-10-09 |
+1.2945 |
-0.124 |
| 1991-10-09 |
1993-01-21 |
-0.0631 |
+0.767 |
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) |
| 2026-05-12 00:00 |
12:30:19.61 |
-19:16:41.4 |
HIP 61083 |
22.34 |
| 2026-05-12 12:00 |
12:30:16.25 |
-19:16:09.3 |
HIP 61083 |
23.21 |
| 2026-05-13 00:00 |
12:30:12.93 |
-19:15:37.2 |
HIP 61083 |
24.09 |
| 2026-05-13 12:00 |
12:30:09.64 |
-19:15:05.2 |
HIP 61083 |
24.97 |
| 2026-05-14 00:00 |
12:30:06.37 |
-19:14:33.2 |
HIP 61083 |
25.85 |
| 2026-05-14 12:00 |
12:30:03.14 |
-19:14:01.3 |
HIP 61083 |
26.73 |
| 2026-05-15 00:00 |
12:29:59.94 |
-19:13:29.4 |
HIP 60844 |
26.67 |
| 2026-05-15 12:00 |
12:29:56.76 |
-19:12:57.6 |
HIP 60844 |
25.77 |
| 2026-05-16 00:00 |
12:29:53.62 |
-19:12:25.8 |
HIP 60844 |
24.88 |
| 2026-05-16 12:00 |
12:29:50.51 |
-19:11:54.1 |
HIP 60844 |
24.01 |
| 2026-05-17 00:00 |
12:29:47.44 |
-19:11:22.5 |
HIP 60844 |
23.13 |
| 2026-05-17 12:00 |
12:29:44.39 |
-19:10:50.9 |
HIP 60844 |
22.27 |
| 2026-05-18 00:00 |
12:29:41.38 |
-19:10:19.4 |
HIP 60844 |
21.42 |
| 2026-05-18 12:00 |
12:29:38.40 |
-19:09:48.0 |
HIP 60844 |
20.58 |
| 2026-05-19 00:00 |
12:29:35.45 |
-19:09:16.7 |
HIP 60844 |
19.75 |
| 2026-05-19 12:00 |
12:29:32.53 |
-19:08:45.5 |
HIP 60844 |
18.93 |
| 2026-05-20 00:00 |
12:29:29.65 |
-19:08:14.3 |
HIP 60844 |
18.13 |
| 2026-05-20 12:00 |
12:29:26.80 |
-19:07:43.2 |
HIP 60844 |
17.33 |
| 2026-05-21 00:00 |
12:29:23.99 |
-19:07:12.2 |
HIP 60844 |
16.55 |
| 2026-05-21 12:00 |
12:29:21.20 |
-19:06:41.3 |
HIP 60844 |
15.79 |
| 2026-05-22 00:00 |
12:29:18.46 |
-19:06:10.5 |
HIP 60844 |
15.04 |
| 2026-05-22 12:00 |
12:29:15.74 |
-19:05:39.8 |
HIP 60844 |
14.31 |
| 2026-05-23 00:00 |
12:29:13.06 |
-19:05:09.2 |
HIP 60844 |
13.59 |
| 2026-05-23 12:00 |
12:29:10.42 |
-19:04:38.7 |
HIP 60844 |
12.89 |
| 2026-05-24 00:00 |
12:29:07.81 |
-19:04:08.3 |
HIP 60844 |
12.22 |
| 2026-05-24 12:00 |
12:29:05.23 |
-19:03:38.0 |
HIP 60844 |
11.57 |
| 2026-05-25 00:00 |
12:29:02.69 |
-19:03:07.8 |
HIP 60844 |
10.95 |
| 2026-05-25 12:00 |
12:29:00.18 |
-19:02:37.8 |
HIP 60844 |
10.36 |
| 2026-05-26 00:00 |
12:28:57.71 |
-19:02:07.8 |
HIP 60844 |
9.80 |
| 2026-05-26 12:00 |
12:28:55.28 |
-19:01:38.0 |
HIP 60844 |
9.28 |
| 2026-05-27 00:00 |
12:28:52.88 |
-19:01:08.2 |
HIP 60844 |
8.80 |
| 2026-05-27 12:00 |
12:28:50.51 |
-19:00:38.6 |
HIP 60844 |
8.37 |
| 2026-05-28 00:00 |
12:28:48.18 |
-19:00:09.2 |
HIP 60844 |
7.99 |
| 2026-05-28 12:00 |
12:28:45.89 |
-18:59:39.8 |
HIP 60844 |
7.67 |
| 2026-05-29 00:00 |
12:28:43.63 |
-18:59:10.6 |
HIP 60844 |
7.42 |
| 2026-05-29 12:00 |
12:28:41.41 |
-18:58:41.5 |
HIP 60844 |
7.24 |
| 2026-05-30 00:00 |
12:28:39.23 |
-18:58:12.5 |
HIP 60844 |
7.13 |
| 2026-05-30 12:00 |
12:28:37.08 |
-18:57:43.7 |
HIP 60844 |
7.09 |
| 2026-05-31 00:00 |
12:28:34.97 |
-18:57:15.0 |
HIP 60844 |
7.13 |
| 2026-05-31 12:00 |
12:28:32.89 |
-18:56:46.5 |
HIP 60844 |
7.23 |
| 2026-06-01 00:00 |
12:28:30.85 |
-18:56:18.1 |
HIP 60844 |
7.40 |
| 2026-06-01 12:00 |
12:28:28.85 |
-18:55:49.8 |
HIP 60844 |
7.62 |
| 2026-06-02 00:00 |
12:28:26.88 |
-18:55:21.7 |
HIP 60844 |
7.90 |