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) |
| 2026-07-29 00:00 |
05:12:47.34 |
+07:09:30.6 |
HIP 24229 |
20.43 |
| 2026-07-29 12:00 |
05:12:49.05 |
+07:09:26.4 |
HIP 24229 |
20.58 |
| 2026-07-30 00:00 |
05:12:50.74 |
+07:09:22.1 |
HIP 24229 |
20.73 |
| 2026-07-30 12:00 |
05:12:52.41 |
+07:09:17.7 |
HIP 24229 |
20.88 |
| 2026-07-31 00:00 |
05:12:54.07 |
+07:09:13.3 |
HIP 24229 |
21.04 |
| 2026-07-31 12:00 |
05:12:55.72 |
+07:09:08.8 |
HIP 24229 |
21.20 |
| 2026-08-01 00:00 |
05:12:57.35 |
+07:09:04.2 |
HIP 24229 |
21.37 |
| 2026-08-01 12:00 |
05:12:58.96 |
+07:08:59.5 |
HIP 24229 |
21.54 |
| 2026-08-02 00:00 |
05:13:00.56 |
+07:08:54.8 |
HIP 24229 |
21.71 |
| 2026-08-02 12:00 |
05:13:02.14 |
+07:08:50.0 |
HIP 24229 |
21.89 |
| 2026-08-03 00:00 |
05:13:03.71 |
+07:08:45.1 |
HIP 24229 |
22.07 |
| 2026-08-03 12:00 |
05:13:05.27 |
+07:08:40.2 |
HIP 24229 |
22.25 |
| 2026-08-04 00:00 |
05:13:06.80 |
+07:08:35.1 |
HIP 24229 |
22.43 |
| 2026-08-04 12:00 |
05:13:08.33 |
+07:08:30.1 |
HIP 24229 |
22.62 |
| 2026-08-05 00:00 |
05:13:09.83 |
+07:08:24.9 |
HIP 24229 |
22.80 |
| 2026-08-05 12:00 |
05:13:11.32 |
+07:08:19.7 |
HIP 24229 |
22.99 |
| 2026-08-06 00:00 |
05:13:12.80 |
+07:08:14.3 |
HIP 24229 |
23.18 |
| 2026-08-06 12:00 |
05:13:14.26 |
+07:08:09.0 |
HIP 24229 |
23.37 |
| 2026-08-07 00:00 |
05:13:15.70 |
+07:08:03.5 |
HIP 24229 |
23.56 |
| 2026-08-07 12:00 |
05:13:17.12 |
+07:07:58.0 |
HIP 24229 |
23.75 |
| 2026-08-08 00:00 |
05:13:18.53 |
+07:07:52.4 |
HIP 24229 |
23.94 |
| 2026-08-08 12:00 |
05:13:19.92 |
+07:07:46.8 |
HIP 24229 |
24.13 |
| 2026-08-09 00:00 |
05:13:21.30 |
+07:07:41.0 |
HIP 24229 |
24.32 |
| 2026-08-09 12:00 |
05:13:22.66 |
+07:07:35.3 |
HIP 24229 |
24.51 |
| 2026-08-10 00:00 |
05:13:24.00 |
+07:07:29.4 |
HIP 24229 |
24.70 |
| 2026-08-10 12:00 |
05:13:25.32 |
+07:07:23.5 |
HIP 24229 |
24.89 |
| 2026-08-11 00:00 |
05:13:26.63 |
+07:07:17.5 |
HIP 24229 |
25.08 |
| 2026-08-11 12:00 |
05:13:27.92 |
+07:07:11.4 |
HIP 24229 |
25.27 |
| 2026-08-12 00:00 |
05:13:29.19 |
+07:07:05.3 |
HIP 24229 |
25.46 |
| 2026-08-12 12:00 |
05:13:30.45 |
+07:06:59.1 |
HIP 24229 |
25.64 |
| 2026-08-13 00:00 |
05:13:31.69 |
+07:06:52.9 |
HIP 24229 |
25.83 |
| 2026-08-13 12:00 |
05:13:32.90 |
+07:06:46.5 |
HIP 24229 |
26.01 |
| 2026-08-14 00:00 |
05:13:34.11 |
+07:06:40.2 |
HIP 24229 |
26.19 |
| 2026-08-14 12:00 |
05:13:35.29 |
+07:06:33.7 |
HIP 24229 |
26.37 |
| 2026-08-15 00:00 |
05:13:36.46 |
+07:06:27.2 |
HIP 24229 |
26.55 |
| 2026-08-15 12:00 |
05:13:37.60 |
+07:06:20.7 |
HIP 24229 |
26.73 |
| 2026-08-16 00:00 |
05:13:38.73 |
+07:06:14.0 |
HIP 24229 |
26.90 |
| 2026-08-16 12:00 |
05:13:39.84 |
+07:06:07.3 |
HIP 24510 |
26.63 |
| 2026-08-17 00:00 |
05:13:40.94 |
+07:06:00.6 |
HIP 24510 |
26.35 |
| 2026-08-17 12:00 |
05:13:42.01 |
+07:05:53.8 |
HIP 24510 |
26.08 |
| 2026-08-18 00:00 |
05:13:43.07 |
+07:05:46.9 |
HIP 24510 |
25.80 |
| 2026-08-18 12:00 |
05:13:44.10 |
+07:05:40.0 |
HIP 24510 |
25.54 |
| 2026-08-19 00:00 |
05:13:45.12 |
+07:05:33.0 |
HIP 24510 |
25.28 |