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
$$
M_a = (-0.494 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-0.494 |
| n |
6.000 |
| gf |
0.904 |
| gb |
-0.957 |
| k |
1.000 |
| δ90 |
5.038 |
| 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 |
+1.1436 |
-1.109 |
| 2004-06-23 |
2006-01-02 |
+6.0714 |
-5.664 |
| 2006-01-02 |
2007-01-11 |
+17.2883 |
-15.484 |
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 |
07:24:46.16 |
+22:48:48.3 |
HIP 35930 |
8.46 |
| 2026-05-12 12:00 |
07:24:47.99 |
+22:48:48.3 |
HIP 35930 |
8.71 |
| 2026-05-13 00:00 |
07:24:49.84 |
+22:48:48.2 |
HIP 35930 |
8.98 |
| 2026-05-13 12:00 |
07:24:51.71 |
+22:48:48.1 |
HIP 35930 |
9.27 |
| 2026-05-14 00:00 |
07:24:53.61 |
+22:48:47.9 |
HIP 35930 |
9.57 |
| 2026-05-14 12:00 |
07:24:55.53 |
+22:48:47.7 |
HIP 35930 |
9.88 |
| 2026-05-15 00:00 |
07:24:57.47 |
+22:48:47.4 |
HIP 35930 |
10.21 |
| 2026-05-15 12:00 |
07:24:59.43 |
+22:48:47.1 |
HIP 35930 |
10.55 |
| 2026-05-16 00:00 |
07:25:01.41 |
+22:48:46.7 |
HIP 35930 |
10.91 |
| 2026-05-16 12:00 |
07:25:03.41 |
+22:48:46.3 |
HIP 35930 |
11.27 |
| 2026-05-17 00:00 |
07:25:05.44 |
+22:48:45.9 |
HIP 35930 |
11.65 |
| 2026-05-17 12:00 |
07:25:07.49 |
+22:48:45.4 |
HIP 35930 |
12.04 |
| 2026-05-18 00:00 |
07:25:09.56 |
+22:48:44.9 |
HIP 35930 |
12.44 |
| 2026-05-18 12:00 |
07:25:11.65 |
+22:48:44.3 |
HIP 35930 |
12.84 |
| 2026-05-19 00:00 |
07:25:13.76 |
+22:48:43.7 |
HIP 35930 |
13.26 |
| 2026-05-19 12:00 |
07:25:15.89 |
+22:48:43.0 |
HIP 35930 |
13.69 |
| 2026-05-20 00:00 |
07:25:18.04 |
+22:48:42.4 |
HIP 35930 |
14.12 |
| 2026-05-20 12:00 |
07:25:20.21 |
+22:48:41.6 |
HIP 35930 |
14.57 |
| 2026-05-21 00:00 |
07:25:22.41 |
+22:48:40.8 |
HIP 35930 |
15.02 |
| 2026-05-21 12:00 |
07:25:24.62 |
+22:48:40.0 |
HIP 35930 |
15.48 |
| 2026-05-22 00:00 |
07:25:26.85 |
+22:48:39.2 |
HIP 35930 |
15.94 |
| 2026-05-22 12:00 |
07:25:29.10 |
+22:48:38.3 |
HIP 35930 |
16.42 |
| 2026-05-23 00:00 |
07:25:31.37 |
+22:48:37.3 |
HIP 35930 |
16.90 |
| 2026-05-23 12:00 |
07:25:33.66 |
+22:48:36.3 |
HIP 35930 |
17.39 |
| 2026-05-24 00:00 |
07:25:35.97 |
+22:48:35.3 |
HIP 35930 |
17.88 |
| 2026-05-24 12:00 |
07:25:38.30 |
+22:48:34.3 |
HIP 35930 |
18.38 |
| 2026-05-25 00:00 |
07:25:40.64 |
+22:48:33.2 |
HIP 35930 |
18.89 |
| 2026-05-25 12:00 |
07:25:43.01 |
+22:48:32.1 |
HIP 35930 |
19.40 |
| 2026-05-26 00:00 |
07:25:45.39 |
+22:48:30.9 |
HIP 35930 |
19.92 |
| 2026-05-26 12:00 |
07:25:47.80 |
+22:48:29.7 |
HIP 35930 |
20.44 |
| 2026-05-27 00:00 |
07:25:50.22 |
+22:48:28.5 |
HIP 35930 |
20.97 |
| 2026-05-27 12:00 |
07:25:52.65 |
+22:48:27.2 |
HIP 35930 |
21.51 |
| 2026-05-28 00:00 |
07:25:55.11 |
+22:48:25.9 |
HIP 35930 |
22.05 |
| 2026-05-28 12:00 |
07:25:57.58 |
+22:48:24.5 |
HIP 35930 |
22.60 |
| 2026-05-29 00:00 |
07:26:00.07 |
+22:48:23.1 |
HIP 35930 |
23.15 |
| 2026-05-29 12:00 |
07:26:02.58 |
+22:48:21.7 |
HIP 35930 |
23.70 |
| 2026-05-30 00:00 |
07:26:05.10 |
+22:48:20.3 |
HIP 35930 |
24.26 |
| 2026-05-30 12:00 |
07:26:07.65 |
+22:48:18.8 |
HIP 35930 |
24.83 |
| 2026-05-31 00:00 |
07:26:10.20 |
+22:48:17.3 |
HIP 35930 |
25.40 |
| 2026-05-31 12:00 |
07:26:12.78 |
+22:48:15.7 |
HIP 35930 |
25.98 |
| 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 |