メタデータ
| 項目 |
値 |
| Designation |
C/2003 J1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-10-10T14:30:59.739840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:29Z |
| Obs used |
80 |
| NEO |
- |
| M1 |
11.300 |
| 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) |
2003-07-19.0000000 |
| e |
0.99112756 |
| q (au) |
5.125425 |
| a (au) |
577.679266 |
| i (deg) |
98.313465 |
| Ω (om, deg) |
122.033180 |
| ω (w, deg) |
196.028937 |
| M (ma, deg) |
359.994065 |
等級
散乱 + 全体線形
$$
M_a = (10.067 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.067 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.502 |
| 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) |
| 2026-05-12 00:00 |
08:03:51.08 |
-04:52:32.3 |
HIP 39483 |
5.57 |
| 2026-05-12 12:00 |
08:03:52.16 |
-04:52:14.5 |
HIP 39483 |
5.19 |
| 2026-05-13 00:00 |
08:03:53.27 |
-04:51:56.8 |
HIP 39483 |
4.81 |
| 2026-05-13 12:00 |
08:03:54.39 |
-04:51:39.3 |
HIP 39483 |
4.42 |
| 2026-05-14 00:00 |
08:03:55.54 |
-04:51:22.0 |
HIP 39483 |
4.03 |
| 2026-05-14 12:00 |
08:03:56.71 |
-04:51:04.7 |
HIP 39483 |
3.65 |
| 2026-05-15 00:00 |
08:03:57.91 |
-04:50:47.6 |
HIP 39483 |
3.27 |
| 2026-05-15 12:00 |
08:03:59.12 |
-04:50:30.7 |
HIP 39483 |
2.89 |
| 2026-05-16 00:00 |
08:04:00.36 |
-04:50:13.8 |
HIP 39483 |
2.51 |
| 2026-05-16 12:00 |
08:04:01.61 |
-04:49:57.1 |
HIP 39483 |
2.15 |
| 2026-05-17 00:00 |
08:04:02.89 |
-04:49:40.6 |
HIP 39483 |
1.81 |
| 2026-05-17 12:00 |
08:04:04.19 |
-04:49:24.2 |
HIP 39483 |
1.50 |
| 2026-05-18 00:00 |
08:04:05.51 |
-04:49:07.9 |
HIP 39483 |
1.25 |
| 2026-05-18 12:00 |
08:04:06.85 |
-04:48:51.8 |
HIP 39483 |
1.11 |
| 2026-05-19 00:00 |
08:04:08.21 |
-04:48:35.8 |
HIP 39483 |
1.13 |
| 2026-05-19 12:00 |
08:04:09.59 |
-04:48:20.0 |
HIP 39483 |
1.29 |
| 2026-05-20 00:00 |
08:04:11.00 |
-04:48:04.3 |
HIP 39483 |
1.56 |
| 2026-05-20 12:00 |
08:04:12.42 |
-04:47:48.7 |
HIP 39483 |
1.89 |
| 2026-05-21 00:00 |
08:04:13.86 |
-04:47:33.3 |
HIP 39483 |
2.26 |
| 2026-05-21 12:00 |
08:04:15.33 |
-04:47:18.1 |
HIP 39483 |
2.65 |
| 2026-05-22 00:00 |
08:04:16.81 |
-04:47:03.0 |
HIP 39483 |
3.06 |
| 2026-05-22 12:00 |
08:04:18.32 |
-04:46:48.0 |
HIP 39483 |
3.48 |
| 2026-05-23 00:00 |
08:04:19.84 |
-04:46:33.2 |
HIP 39483 |
3.90 |
| 2026-05-23 12:00 |
08:04:21.38 |
-04:46:18.5 |
HIP 39483 |
4.33 |
| 2026-05-24 00:00 |
08:04:22.94 |
-04:46:04.0 |
HIP 39483 |
4.77 |
| 2026-05-24 12:00 |
08:04:24.52 |
-04:45:49.7 |
HIP 39483 |
5.22 |
| 2026-05-25 00:00 |
08:04:26.12 |
-04:45:35.4 |
HIP 39483 |
5.66 |
| 2026-05-25 12:00 |
08:04:27.74 |
-04:45:21.4 |
HIP 39483 |
6.12 |
| 2026-05-26 00:00 |
08:04:29.38 |
-04:45:07.5 |
HIP 39483 |
6.57 |
| 2026-05-26 12:00 |
08:04:31.04 |
-04:44:53.7 |
HIP 39483 |
7.03 |
| 2026-05-27 00:00 |
08:04:32.72 |
-04:44:40.1 |
HIP 39483 |
7.49 |
| 2026-05-27 12:00 |
08:04:34.41 |
-04:44:26.6 |
HIP 39483 |
7.96 |
| 2026-05-28 00:00 |
08:04:36.12 |
-04:44:13.3 |
HIP 39483 |
8.43 |
| 2026-05-28 12:00 |
08:04:37.85 |
-04:44:00.2 |
HIP 39483 |
8.90 |
| 2026-05-29 00:00 |
08:04:39.60 |
-04:43:47.2 |
HIP 39483 |
9.37 |
| 2026-05-29 12:00 |
08:04:41.37 |
-04:43:34.3 |
HIP 39483 |
9.85 |
| 2026-05-30 00:00 |
08:04:43.15 |
-04:43:21.6 |
HIP 39483 |
10.33 |
| 2026-05-30 12:00 |
08:04:44.96 |
-04:43:09.1 |
HIP 39483 |
10.82 |
| 2026-05-31 00:00 |
08:04:46.78 |
-04:42:56.7 |
HIP 39483 |
11.31 |
| 2026-05-31 12:00 |
08:04:48.61 |
-04:42:44.5 |
HIP 39483 |
11.80 |
| 2026-06-01 00:00 |
08:04:50.47 |
-04:42:32.4 |
HIP 39483 |
12.29 |
| 2026-06-01 12:00 |
08:04:52.34 |
-04:42:20.5 |
HIP 39483 |
12.79 |
| 2026-06-02 00:00 |
08:04:54.23 |
-04:42:08.8 |
HIP 39483 |
13.28 |