メタデータ
| 項目 |
値 |
| Designation |
C/2002 L9 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-04-05T23:32:55.766400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:17Z |
| Obs used |
330 |
| NEO |
- |
| M1 |
6.100 |
| K1 |
7.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2004-09-27.0000000 |
| e |
0.99841352 |
| q (au) |
7.033001 |
| a (au) |
4433.085954 |
| i (deg) |
68.442088 |
| Ω (om, deg) |
110.451316 |
| ω (w, deg) |
231.428516 |
| M (ma, deg) |
0.000581 |
等級
散乱 + 全体線形
$$
M_a = (-0.517 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-0.517 |
| n |
6.000 |
| gf |
0.908 |
| gb |
-0.957 |
| k |
1.000 |
| δ90 |
5.625 |
| 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 |
| 2002-06-06 |
2003-10-20 |
+1.1441 |
-1.109 |
| 2004-06-23 |
2006-01-02 |
+6.0710 |
-5.664 |
| 2006-01-02 |
2007-01-11 |
+17.2877 |
-15.483 |
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) |
| 2026-06-01 00:00 |
07:26:15.37 |
+22:48:14.1 |
HIP 35930 |
26.56 |
| 2026-06-01 12:00 |
07:26:17.98 |
+22:48:12.5 |
HIP 36279 |
26.97 |
| 2026-06-02 00:00 |
07:26:20.60 |
+22:48:10.9 |
HIP 36279 |
26.39 |
| 2026-06-02 12:00 |
07:26:23.24 |
+22:48:09.2 |
HIP 36279 |
25.81 |
| 2026-06-03 00:00 |
07:26:25.89 |
+22:48:07.5 |
HIP 36279 |
25.23 |
| 2026-06-03 12:00 |
07:26:28.57 |
+22:48:05.7 |
HIP 36279 |
24.65 |
| 2026-06-04 00:00 |
07:26:31.25 |
+22:48:04.0 |
HIP 36279 |
24.06 |
| 2026-06-04 12:00 |
07:26:33.95 |
+22:48:02.2 |
HIP 36279 |
23.47 |
| 2026-06-05 00:00 |
07:26:36.67 |
+22:48:00.3 |
HIP 36279 |
22.88 |
| 2026-06-05 12:00 |
07:26:39.40 |
+22:47:58.4 |
HIP 36279 |
22.29 |
| 2026-06-06 00:00 |
07:26:42.15 |
+22:47:56.6 |
HIP 36279 |
21.70 |
| 2026-06-06 12:00 |
07:26:44.91 |
+22:47:54.6 |
HIP 36279 |
21.10 |
| 2026-06-07 00:00 |
07:26:47.68 |
+22:47:52.7 |
HIP 36279 |
20.51 |
| 2026-06-07 12:00 |
07:26:50.47 |
+22:47:50.7 |
HIP 36279 |
19.92 |
| 2026-06-08 00:00 |
07:26:53.27 |
+22:47:48.7 |
HIP 36279 |
19.32 |
| 2026-06-08 12:00 |
07:26:56.09 |
+22:47:46.6 |
HIP 36279 |
18.73 |
| 2026-06-09 00:00 |
07:26:58.92 |
+22:47:44.6 |
HIP 36279 |
18.13 |
| 2026-06-09 12:00 |
07:27:01.77 |
+22:47:42.5 |
HIP 36279 |
17.54 |
| 2026-06-10 00:00 |
07:27:04.63 |
+22:47:40.3 |
HIP 36279 |
16.95 |
| 2026-06-10 12:00 |
07:27:07.50 |
+22:47:38.2 |
HIP 36279 |
16.37 |
| 2026-06-11 00:00 |
07:27:10.38 |
+22:47:36.0 |
HIP 36279 |
15.78 |
| 2026-06-11 12:00 |
07:27:13.28 |
+22:47:33.8 |
HIP 36279 |
15.20 |
| 2026-06-12 00:00 |
07:27:16.19 |
+22:47:31.6 |
HIP 36279 |
14.63 |
| 2026-06-12 12:00 |
07:27:19.11 |
+22:47:29.3 |
HIP 36279 |
14.06 |
| 2026-06-13 00:00 |
07:27:22.04 |
+22:47:27.0 |
HIP 36279 |
13.50 |
| 2026-06-13 12:00 |
07:27:24.99 |
+22:47:24.7 |
HIP 36279 |
12.95 |
| 2026-06-14 00:00 |
07:27:27.95 |
+22:47:22.4 |
HIP 36279 |
12.40 |
| 2026-06-14 12:00 |
07:27:30.92 |
+22:47:20.0 |
HIP 36279 |
11.87 |
| 2026-06-15 00:00 |
07:27:33.90 |
+22:47:17.7 |
HIP 36279 |
11.36 |
| 2026-06-15 12:00 |
07:27:36.89 |
+22:47:15.3 |
HIP 36279 |
10.86 |
| 2026-06-16 00:00 |
07:27:39.89 |
+22:47:12.8 |
HIP 36279 |
10.38 |
| 2026-06-16 12:00 |
07:27:42.91 |
+22:47:10.4 |
HIP 36279 |
9.93 |
| 2026-06-17 00:00 |
07:27:45.93 |
+22:47:07.9 |
HIP 36279 |
9.50 |
| 2026-06-17 12:00 |
07:27:48.97 |
+22:47:05.5 |
HIP 36279 |
9.11 |
| 2026-06-18 00:00 |
07:27:52.01 |
+22:47:02.9 |
HIP 36279 |
8.75 |
| 2026-06-18 12:00 |
07:27:55.07 |
+22:47:00.4 |
HIP 36279 |
8.44 |
| 2026-06-19 00:00 |
07:27:58.14 |
+22:46:57.9 |
HIP 36279 |
8.17 |
| 2026-06-19 12:00 |
07:28:01.21 |
+22:46:55.3 |
HIP 36279 |
7.96 |
| 2026-06-20 00:00 |
07:28:04.29 |
+22:46:52.7 |
HIP 36279 |
7.81 |
| 2026-06-20 12:00 |
07:28:07.39 |
+22:46:50.1 |
HIP 36279 |
7.71 |
| 2026-06-21 00:00 |
07:28:10.49 |
+22:46:47.5 |
HIP 36279 |
7.69 |
| 2026-06-21 12:00 |
07:28:13.60 |
+22:46:44.9 |
HIP 36279 |
7.73 |
| 2026-06-22 00:00 |
07:28:16.72 |
+22:46:42.2 |
HIP 36279 |
7.84 |