メタデータ
| 項目 |
値 |
| Designation |
C/2003 E1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-02-13T14:31:17.322240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:26Z |
| Obs used |
235 |
| NEO |
- |
| M1 |
13.700 |
| 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) |
2003-10-15.0000000 |
| e |
0.76358329 |
| q (au) |
3.244959 |
| a (au) |
13.725590 |
| i (deg) |
33.537820 |
| Ω (om, deg) |
137.069987 |
| ω (w, deg) |
103.859277 |
| M (ma, deg) |
357.643002 |
等級
散乱 + 全体線形
$$
M_a = (12.327 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.327 |
| n |
2.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2003-03-09 |
2004-02-05 |
+11.2722 |
-7.341 |
| 2004-02-21 |
2004-09-11 |
+21.5365 |
-11.046 |
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) |
| 2026-03-26 00:00 |
04:02:49.88 |
-12:15:07.2 |
HIP 19011 |
39.55 |
| 2026-03-26 12:00 |
04:02:52.90 |
-12:14:25.1 |
HIP 19011 |
39.72 |
| 2026-03-27 00:00 |
04:02:55.95 |
-12:13:43.1 |
HIP 19053 |
39.11 |
| 2026-03-27 12:00 |
04:02:59.03 |
-12:13:01.3 |
HIP 19053 |
38.09 |
| 2026-03-28 00:00 |
04:03:02.14 |
-12:12:19.6 |
HIP 19053 |
37.06 |
| 2026-03-28 12:00 |
04:03:05.29 |
-12:11:38.0 |
HIP 19053 |
36.02 |
| 2026-03-29 00:00 |
04:03:08.47 |
-12:10:56.5 |
HIP 19053 |
34.98 |
| 2026-03-29 12:00 |
04:03:11.69 |
-12:10:15.2 |
HIP 19053 |
33.94 |
| 2026-03-30 00:00 |
04:03:14.93 |
-12:09:34.0 |
HIP 19053 |
32.89 |
| 2026-03-30 12:00 |
04:03:18.21 |
-12:08:52.9 |
HIP 19053 |
31.83 |
| 2026-03-31 00:00 |
04:03:21.52 |
-12:08:12.0 |
HIP 19053 |
30.78 |
| 2026-03-31 12:00 |
04:03:24.86 |
-12:07:31.2 |
HIP 19053 |
29.71 |
| 2026-04-01 00:00 |
04:03:28.23 |
-12:06:50.5 |
HIP 19053 |
28.65 |
| 2026-04-01 12:00 |
04:03:31.63 |
-12:06:10.0 |
HIP 19053 |
27.58 |
| 2026-04-02 00:00 |
04:03:35.06 |
-12:05:29.7 |
HIP 19053 |
26.50 |
| 2026-04-02 12:00 |
04:03:38.52 |
-12:04:49.4 |
HIP 19053 |
25.43 |
| 2026-04-03 00:00 |
04:03:42.02 |
-12:04:09.4 |
HIP 19053 |
24.34 |
| 2026-04-03 12:00 |
04:03:45.54 |
-12:03:29.5 |
HIP 19053 |
23.26 |
| 2026-04-04 00:00 |
04:03:49.09 |
-12:02:49.7 |
HIP 19053 |
22.17 |
| 2026-04-04 12:00 |
04:03:52.67 |
-12:02:10.1 |
HIP 19053 |
21.08 |
| 2026-04-05 00:00 |
04:03:56.28 |
-12:01:30.6 |
HIP 19053 |
19.98 |
| 2026-04-05 12:00 |
04:03:59.92 |
-12:00:51.4 |
HIP 19053 |
18.89 |
| 2026-04-06 00:00 |
04:04:03.59 |
-12:00:12.2 |
HIP 19053 |
17.79 |
| 2026-04-06 12:00 |
04:04:07.29 |
-11:59:33.3 |
HIP 19053 |
16.68 |
| 2026-04-07 00:00 |
04:04:11.01 |
-11:58:54.5 |
HIP 19053 |
15.58 |
| 2026-04-07 12:00 |
04:04:14.77 |
-11:58:15.9 |
HIP 19053 |
14.48 |
| 2026-04-08 00:00 |
04:04:18.55 |
-11:57:37.4 |
HIP 19053 |
13.37 |
| 2026-04-08 12:00 |
04:04:22.36 |
-11:56:59.1 |
HIP 19053 |
12.27 |
| 2026-04-09 00:00 |
04:04:26.20 |
-11:56:21.0 |
HIP 19053 |
11.17 |
| 2026-04-09 12:00 |
04:04:30.06 |
-11:55:43.1 |
HIP 19053 |
10.08 |
| 2026-04-10 00:00 |
04:04:33.95 |
-11:55:05.4 |
HIP 19053 |
8.99 |
| 2026-04-10 12:00 |
04:04:37.87 |
-11:54:27.8 |
HIP 19053 |
7.92 |
| 2026-04-11 00:00 |
04:04:41.81 |
-11:53:50.5 |
HIP 19053 |
6.88 |
| 2026-04-11 12:00 |
04:04:45.78 |
-11:53:13.3 |
HIP 19053 |
5.87 |
| 2026-04-12 00:00 |
04:04:49.78 |
-11:52:36.3 |
HIP 19053 |
4.92 |
| 2026-04-12 12:00 |
04:04:53.80 |
-11:51:59.5 |
HIP 19053 |
4.09 |
| 2026-04-13 00:00 |
04:04:57.85 |
-11:51:22.9 |
HIP 19053 |
3.46 |
| 2026-04-13 12:00 |
04:05:01.92 |
-11:50:46.4 |
HIP 19053 |
3.15 |
| 2026-04-14 00:00 |
04:05:06.02 |
-11:50:10.2 |
HIP 19053 |
3.27 |
| 2026-04-14 12:00 |
04:05:10.14 |
-11:49:34.2 |
HIP 19053 |
3.77 |
| 2026-04-15 00:00 |
04:05:14.29 |
-11:48:58.4 |
HIP 19053 |
4.53 |
| 2026-04-15 12:00 |
04:05:18.46 |
-11:48:22.8 |
HIP 19053 |
5.45 |
| 2026-04-16 00:00 |
04:05:22.66 |
-11:47:47.4 |
HIP 19053 |
6.46 |