メタデータ
| 項目 |
値 |
| Designation |
C/1999 L2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-08-04T21:14:58.248960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:00Z |
| Obs used |
94 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1999-06-22.0000000 |
| e |
0.99514569 |
| q (au) |
1.904764 |
| a (au) |
392.386280 |
| i (deg) |
43.941726 |
| Ω (om, deg) |
94.289819 |
| ω (w, deg) |
178.715840 |
| M (ma, deg) |
359.994435 |
等級
散乱 + 全体線形
$$
M_a = (11.743 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.743 |
| n |
6.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
05:04:22.30 |
+06:46:52.7 |
HIP 23542 |
12.43 |
| 2026-03-26 12:00 |
05:04:23.11 |
+06:47:04.6 |
HIP 23542 |
12.71 |
| 2026-03-27 00:00 |
05:04:23.94 |
+06:47:16.5 |
HIP 23542 |
13.00 |
| 2026-03-27 12:00 |
05:04:24.79 |
+06:47:28.4 |
HIP 23542 |
13.29 |
| 2026-03-28 00:00 |
05:04:25.66 |
+06:47:40.4 |
HIP 23542 |
13.58 |
| 2026-03-28 12:00 |
05:04:26.55 |
+06:47:52.3 |
HIP 23542 |
13.88 |
| 2026-03-29 00:00 |
05:04:27.46 |
+06:48:04.2 |
HIP 23542 |
14.18 |
| 2026-03-29 12:00 |
05:04:28.39 |
+06:48:16.1 |
HIP 23542 |
14.48 |
| 2026-03-30 00:00 |
05:04:29.34 |
+06:48:27.9 |
HIP 23542 |
14.79 |
| 2026-03-30 12:00 |
05:04:30.31 |
+06:48:39.8 |
HIP 23542 |
15.10 |
| 2026-03-31 00:00 |
05:04:31.30 |
+06:48:51.7 |
HIP 23542 |
15.42 |
| 2026-03-31 12:00 |
05:04:32.30 |
+06:49:03.5 |
HIP 23542 |
15.73 |
| 2026-04-01 00:00 |
05:04:33.33 |
+06:49:15.4 |
HIP 23542 |
16.05 |
| 2026-04-01 12:00 |
05:04:34.38 |
+06:49:27.2 |
HIP 23542 |
16.38 |
| 2026-04-02 00:00 |
05:04:35.44 |
+06:49:39.0 |
HIP 23542 |
16.71 |
| 2026-04-02 12:00 |
05:04:36.52 |
+06:49:50.8 |
HIP 23542 |
17.04 |
| 2026-04-03 00:00 |
05:04:37.62 |
+06:50:02.6 |
HIP 23542 |
17.37 |
| 2026-04-03 12:00 |
05:04:38.75 |
+06:50:14.3 |
HIP 23542 |
17.71 |
| 2026-04-04 00:00 |
05:04:39.88 |
+06:50:26.1 |
HIP 23542 |
18.05 |
| 2026-04-04 12:00 |
05:04:41.04 |
+06:50:37.8 |
HIP 23542 |
18.40 |
| 2026-04-05 00:00 |
05:04:42.22 |
+06:50:49.5 |
HIP 23542 |
18.74 |
| 2026-04-05 12:00 |
05:04:43.41 |
+06:51:01.2 |
HIP 23542 |
19.10 |
| 2026-04-06 00:00 |
05:04:44.62 |
+06:51:12.9 |
HIP 23542 |
19.45 |
| 2026-04-06 12:00 |
05:04:45.86 |
+06:51:24.5 |
HIP 23542 |
19.81 |
| 2026-04-07 00:00 |
05:04:47.10 |
+06:51:36.2 |
HIP 23542 |
20.17 |
| 2026-04-07 12:00 |
05:04:48.37 |
+06:51:47.8 |
HIP 23542 |
20.53 |
| 2026-04-08 00:00 |
05:04:49.66 |
+06:51:59.3 |
HIP 23542 |
20.90 |
| 2026-04-08 12:00 |
05:04:50.96 |
+06:52:10.9 |
HIP 23542 |
21.27 |
| 2026-04-09 00:00 |
05:04:52.28 |
+06:52:22.4 |
HIP 23542 |
21.65 |
| 2026-04-09 12:00 |
05:04:53.62 |
+06:52:34.0 |
HIP 23542 |
22.03 |
| 2026-04-10 00:00 |
05:04:54.97 |
+06:52:45.5 |
HIP 23542 |
22.41 |
| 2026-04-10 12:00 |
05:04:56.34 |
+06:52:56.9 |
HIP 23542 |
22.79 |
| 2026-04-11 00:00 |
05:04:57.73 |
+06:53:08.3 |
HIP 23542 |
23.18 |
| 2026-04-11 12:00 |
05:04:59.14 |
+06:53:19.8 |
HIP 23542 |
23.57 |
| 2026-04-12 00:00 |
05:05:00.57 |
+06:53:31.1 |
HIP 23542 |
23.96 |
| 2026-04-12 12:00 |
05:05:02.01 |
+06:53:42.5 |
HIP 23542 |
24.36 |
| 2026-04-13 00:00 |
05:05:03.47 |
+06:53:53.8 |
HIP 23542 |
24.76 |
| 2026-04-13 12:00 |
05:05:04.94 |
+06:54:05.1 |
HIP 23542 |
25.16 |
| 2026-04-14 00:00 |
05:05:06.43 |
+06:54:16.4 |
HIP 23542 |
25.57 |
| 2026-04-14 12:00 |
05:05:07.94 |
+06:54:27.6 |
HIP 23542 |
25.98 |
| 2026-04-15 00:00 |
05:05:09.47 |
+06:54:38.8 |
HIP 23542 |
26.39 |
| 2026-04-15 12:00 |
05:05:11.01 |
+06:54:49.9 |
HIP 23542 |
26.81 |
| 2026-04-16 00:00 |
05:05:12.57 |
+06:55:01.1 |
HIP 23542 |
27.23 |