メタデータ
| 項目 |
値 |
| Designation |
C/2002 L9 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-04-05T23:36:36.622080Z |
| Orbit solution date (soln_date, UTC) |
2026-07-06T12:12:23Z |
| Obs used |
333 |
| NEO |
- |
| M1 |
9.100 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2004-09-23.0000000 |
| e |
0.99841837 |
| q (au) |
7.033003 |
| a (au) |
4446.692041 |
| i (deg) |
68.442151 |
| Ω (om, deg) |
110.451458 |
| ω (w, deg) |
231.428640 |
| M (ma, deg) |
0.000565 |
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) |
| 2026-07-29 00:00 |
07:32:17.29 |
+22:43:08.3 |
HIP 36691 |
12.56 |
| 2026-07-29 12:00 |
07:32:20.48 |
+22:43:05.6 |
HIP 36691 |
12.16 |
| 2026-07-30 00:00 |
07:32:23.66 |
+22:43:02.9 |
HIP 36691 |
11.79 |
| 2026-07-30 12:00 |
07:32:26.84 |
+22:43:00.3 |
HIP 36691 |
11.46 |
| 2026-07-31 00:00 |
07:32:30.01 |
+22:42:57.6 |
HIP 36691 |
11.17 |
| 2026-07-31 12:00 |
07:32:33.17 |
+22:42:55.0 |
HIP 36691 |
10.92 |
| 2026-08-01 00:00 |
07:32:36.33 |
+22:42:52.4 |
HIP 36691 |
10.71 |
| 2026-08-01 12:00 |
07:32:39.48 |
+22:42:49.8 |
HIP 36691 |
10.55 |
| 2026-08-02 00:00 |
07:32:42.62 |
+22:42:47.2 |
HIP 36691 |
10.44 |
| 2026-08-02 12:00 |
07:32:45.75 |
+22:42:44.7 |
HIP 36708 |
10.14 |
| 2026-08-03 00:00 |
07:32:48.87 |
+22:42:42.1 |
HIP 36708 |
9.85 |
| 2026-08-03 12:00 |
07:32:51.99 |
+22:42:39.6 |
HIP 36708 |
9.60 |
| 2026-08-04 00:00 |
07:32:55.09 |
+22:42:37.1 |
HIP 36708 |
9.41 |
| 2026-08-04 12:00 |
07:32:58.19 |
+22:42:34.7 |
HIP 36708 |
9.26 |
| 2026-08-05 00:00 |
07:33:01.28 |
+22:42:32.2 |
HIP 36708 |
9.17 |
| 2026-08-05 12:00 |
07:33:04.36 |
+22:42:29.8 |
HIP 36708 |
9.13 |
| 2026-08-06 00:00 |
07:33:07.43 |
+22:42:27.4 |
HIP 36708 |
9.15 |
| 2026-08-06 12:00 |
07:33:10.49 |
+22:42:25.0 |
HIP 36708 |
9.23 |
| 2026-08-07 00:00 |
07:33:13.54 |
+22:42:22.7 |
HIP 36708 |
9.36 |
| 2026-08-07 12:00 |
07:33:16.59 |
+22:42:20.4 |
HIP 36708 |
9.53 |
| 2026-08-08 00:00 |
07:33:19.62 |
+22:42:18.1 |
HIP 36708 |
9.76 |
| 2026-08-08 12:00 |
07:33:22.64 |
+22:42:15.8 |
HIP 36708 |
10.03 |
| 2026-08-09 00:00 |
07:33:25.65 |
+22:42:13.5 |
HIP 36708 |
10.33 |
| 2026-08-09 12:00 |
07:33:28.65 |
+22:42:11.3 |
HIP 36708 |
10.68 |
| 2026-08-10 00:00 |
07:33:31.64 |
+22:42:09.1 |
HIP 36708 |
11.05 |
| 2026-08-10 12:00 |
07:33:34.62 |
+22:42:06.9 |
HIP 36708 |
11.45 |
| 2026-08-11 00:00 |
07:33:37.58 |
+22:42:04.8 |
HIP 36708 |
11.88 |
| 2026-08-11 12:00 |
07:33:40.54 |
+22:42:02.7 |
HIP 36708 |
12.33 |
| 2026-08-12 00:00 |
07:33:43.48 |
+22:42:00.6 |
HIP 36708 |
12.80 |
| 2026-08-12 12:00 |
07:33:46.41 |
+22:41:58.5 |
HIP 36708 |
13.28 |
| 2026-08-13 00:00 |
07:33:49.33 |
+22:41:56.5 |
HIP 36708 |
13.78 |
| 2026-08-13 12:00 |
07:33:52.24 |
+22:41:54.5 |
HIP 36708 |
14.29 |
| 2026-08-14 00:00 |
07:33:55.13 |
+22:41:52.6 |
HIP 36708 |
14.82 |
| 2026-08-14 12:00 |
07:33:58.01 |
+22:41:50.6 |
HIP 36708 |
15.35 |
| 2026-08-15 00:00 |
07:34:00.88 |
+22:41:48.7 |
HIP 36708 |
15.89 |
| 2026-08-15 12:00 |
07:34:03.74 |
+22:41:46.9 |
HIP 36708 |
16.43 |
| 2026-08-16 00:00 |
07:34:06.58 |
+22:41:45.0 |
HIP 36708 |
16.98 |
| 2026-08-16 12:00 |
07:34:09.41 |
+22:41:43.2 |
HIP 36864 |
17.45 |
| 2026-08-17 00:00 |
07:34:12.22 |
+22:41:41.5 |
HIP 36864 |
17.18 |
| 2026-08-17 12:00 |
07:34:15.02 |
+22:41:39.7 |
HIP 36864 |
16.94 |
| 2026-08-18 00:00 |
07:34:17.81 |
+22:41:38.0 |
HIP 36864 |
16.72 |
| 2026-08-18 12:00 |
07:34:20.58 |
+22:41:36.4 |
HIP 36864 |
16.52 |
| 2026-08-19 00:00 |
07:34:23.34 |
+22:41:34.7 |
HIP 36864 |
16.35 |