メタデータ
| 項目 |
値 |
| Designation |
C/1999 H1 (Lee) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-07-11T04:07:54.053760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:59Z |
| Obs used |
1019 |
| NEO |
- |
| M1 |
9.400 |
| 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) |
1999-08-17.0000000 |
| e |
0.99974475 |
| q (au) |
0.708107 |
| a (au) |
2774.129592 |
| i (deg) |
149.352905 |
| Ω (om, deg) |
162.650897 |
| ω (w, deg) |
40.701567 |
| M (ma, deg) |
0.000248 |
等級
散乱 + 全体線形
$$
M_a = (5.906 + 4.943\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.906 |
| n |
4.943 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.998 |
| 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 |
| 1999-04-16 |
1999-05-14 |
+7.7311 |
-0.623 |
| 1999-05-14 |
1999-07-04 |
-1.8550 |
+0.208 |
| 1999-07-27 |
2000-01-08 |
+0.8828 |
+0.043 |
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) |
| 2026-09-20 00:00 |
21:41:21.87 |
-28:17:38.5 |
HIP 107134 |
37.39 |
| 2026-09-20 12:00 |
21:41:19.72 |
-28:17:43.3 |
HIP 107134 |
37.59 |
| 2026-09-21 00:00 |
21:41:17.59 |
-28:17:47.9 |
HIP 107134 |
37.79 |
| 2026-09-21 12:00 |
21:41:15.48 |
-28:17:52.4 |
HIP 107134 |
37.99 |
| 2026-09-22 00:00 |
21:41:13.38 |
-28:17:56.9 |
HIP 107134 |
38.20 |
| 2026-09-22 12:00 |
21:41:11.29 |
-28:18:01.1 |
HIP 107134 |
38.40 |
| 2026-09-23 00:00 |
21:41:09.21 |
-28:18:05.3 |
HIP 107134 |
38.61 |
| 2026-09-23 12:00 |
21:41:07.15 |
-28:18:09.4 |
HIP 107134 |
38.82 |
| 2026-09-24 00:00 |
21:41:05.10 |
-28:18:13.3 |
HIP 107134 |
39.03 |
| 2026-09-24 12:00 |
21:41:03.07 |
-28:18:17.1 |
HIP 107134 |
39.24 |
| 2026-09-25 00:00 |
21:41:01.05 |
-28:18:20.8 |
HIP 107134 |
39.45 |
| 2026-09-25 12:00 |
21:40:59.04 |
-28:18:24.3 |
HIP 107134 |
39.67 |
| 2026-09-26 00:00 |
21:40:57.05 |
-28:18:27.7 |
HIP 107134 |
39.88 |
| 2026-09-26 12:00 |
21:40:55.08 |
-28:18:31.0 |
HIP 107134 |
40.09 |
| 2026-09-27 00:00 |
21:40:53.12 |
-28:18:34.2 |
HIP 106853 |
39.97 |
| 2026-09-27 12:00 |
21:40:51.17 |
-28:18:37.3 |
HIP 106853 |
39.66 |
| 2026-09-28 00:00 |
21:40:49.24 |
-28:18:40.2 |
HIP 106853 |
39.36 |
| 2026-09-28 12:00 |
21:40:47.32 |
-28:18:43.0 |
HIP 106853 |
39.07 |
| 2026-09-29 00:00 |
21:40:45.42 |
-28:18:45.7 |
HIP 106853 |
38.78 |
| 2026-09-29 12:00 |
21:40:43.53 |
-28:18:48.3 |
HIP 106853 |
38.49 |
| 2026-09-30 00:00 |
21:40:41.66 |
-28:18:50.7 |
HIP 106853 |
38.21 |
| 2026-09-30 12:00 |
21:40:39.81 |
-28:18:53.1 |
HIP 106853 |
37.92 |
| 2026-10-01 00:00 |
21:40:37.97 |
-28:18:55.3 |
HIP 106853 |
37.65 |
| 2026-10-01 12:00 |
21:40:36.14 |
-28:18:57.3 |
HIP 106853 |
37.37 |
| 2026-10-02 00:00 |
21:40:34.34 |
-28:18:59.3 |
HIP 106853 |
37.10 |
| 2026-10-02 12:00 |
21:40:32.55 |
-28:19:01.1 |
HIP 106853 |
36.84 |
| 2026-10-03 00:00 |
21:40:30.77 |
-28:19:02.8 |
HIP 106853 |
36.57 |
| 2026-10-03 12:00 |
21:40:29.01 |
-28:19:04.4 |
HIP 106853 |
36.31 |
| 2026-10-04 00:00 |
21:40:27.27 |
-28:19:05.8 |
HIP 106853 |
36.06 |
| 2026-10-04 12:00 |
21:40:25.55 |
-28:19:07.1 |
HIP 106853 |
35.81 |
| 2026-10-05 00:00 |
21:40:23.84 |
-28:19:08.3 |
HIP 106853 |
35.56 |
| 2026-10-05 12:00 |
21:40:22.15 |
-28:19:09.4 |
HIP 106853 |
35.31 |
| 2026-10-06 00:00 |
21:40:20.48 |
-28:19:10.3 |
HIP 106853 |
35.07 |
| 2026-10-06 12:00 |
21:40:18.82 |
-28:19:11.1 |
HIP 106853 |
34.83 |
| 2026-10-07 00:00 |
21:40:17.18 |
-28:19:11.8 |
HIP 106853 |
34.59 |
| 2026-10-07 12:00 |
21:40:15.56 |
-28:19:12.4 |
HIP 106853 |
34.36 |
| 2026-10-08 00:00 |
21:40:13.96 |
-28:19:12.8 |
HIP 106853 |
34.13 |
| 2026-10-08 12:00 |
21:40:12.37 |
-28:19:13.2 |
HIP 106853 |
33.90 |
| 2026-10-09 00:00 |
21:40:10.80 |
-28:19:13.4 |
HIP 106853 |
33.68 |
| 2026-10-09 12:00 |
21:40:09.25 |
-28:19:13.4 |
HIP 106853 |
33.46 |
| 2026-10-10 00:00 |
21:40:07.72 |
-28:19:13.4 |
HIP 106853 |
33.24 |
| 2026-10-10 12:00 |
21:40:06.21 |
-28:19:13.2 |
HIP 106853 |
33.03 |
| 2026-10-11 00:00 |
21:40:04.72 |
-28:19:12.9 |
HIP 106853 |
32.82 |