メタデータ
| 項目 |
値 |
| Designation |
C/2004 U1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-12-08T18:11:10.507200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:44Z |
| Obs used |
545 |
| NEO |
- |
| M1 |
9.000 |
| K1 |
7.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2005-01-05.0000000 |
| e |
0.99920444 |
| q (au) |
2.659383 |
| a (au) |
3342.783641 |
| i (deg) |
130.623493 |
| Ω (om, deg) |
112.546364 |
| ω (w, deg) |
20.127932 |
| M (ma, deg) |
0.000139 |
等級
散乱 + 全体線形
$$
M_a = (10.689 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.689 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.832 |
| k |
0.800 |
| 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) |
| 2026-03-26 00:00 |
20:02:33.88 |
-13:15:43.5 |
HIP 98633 |
24.09 |
| 2026-03-26 12:00 |
20:02:34.98 |
-13:15:37.1 |
HIP 98633 |
24.29 |
| 2026-03-27 00:00 |
20:02:36.05 |
-13:15:30.8 |
HIP 98633 |
24.48 |
| 2026-03-27 12:00 |
20:02:37.10 |
-13:15:24.6 |
HIP 98633 |
24.67 |
| 2026-03-28 00:00 |
20:02:38.13 |
-13:15:18.4 |
HIP 98633 |
24.86 |
| 2026-03-28 12:00 |
20:02:39.14 |
-13:15:12.2 |
HIP 98633 |
25.05 |
| 2026-03-29 00:00 |
20:02:40.12 |
-13:15:06.1 |
HIP 98633 |
25.24 |
| 2026-03-29 12:00 |
20:02:41.08 |
-13:15:00.0 |
HIP 98633 |
25.43 |
| 2026-03-30 00:00 |
20:02:42.01 |
-13:14:54.0 |
HIP 98633 |
25.61 |
| 2026-03-30 12:00 |
20:02:42.93 |
-13:14:48.1 |
HIP 98633 |
25.80 |
| 2026-03-31 00:00 |
20:02:43.81 |
-13:14:42.2 |
HIP 98633 |
25.98 |
| 2026-03-31 12:00 |
20:02:44.68 |
-13:14:36.3 |
HIP 98633 |
26.15 |
| 2026-04-01 00:00 |
20:02:45.52 |
-13:14:30.5 |
HIP 98633 |
26.33 |
| 2026-04-01 12:00 |
20:02:46.34 |
-13:14:24.8 |
HIP 98633 |
26.50 |
| 2026-04-02 00:00 |
20:02:47.14 |
-13:14:19.1 |
HIP 98633 |
26.67 |
| 2026-04-02 12:00 |
20:02:47.91 |
-13:14:13.5 |
HIP 98633 |
26.84 |
| 2026-04-03 00:00 |
20:02:48.66 |
-13:14:07.9 |
HIP 98633 |
27.00 |
| 2026-04-03 12:00 |
20:02:49.38 |
-13:14:02.4 |
HIP 98633 |
27.17 |
| 2026-04-04 00:00 |
20:02:50.08 |
-13:13:57.0 |
HIP 98633 |
27.32 |
| 2026-04-04 12:00 |
20:02:50.76 |
-13:13:51.6 |
HIP 98633 |
27.48 |
| 2026-04-05 00:00 |
20:02:51.41 |
-13:13:46.3 |
HIP 98633 |
27.63 |
| 2026-04-05 12:00 |
20:02:52.04 |
-13:13:41.0 |
HIP 98633 |
27.78 |
| 2026-04-06 00:00 |
20:02:52.64 |
-13:13:35.8 |
HIP 98633 |
27.93 |
| 2026-04-06 12:00 |
20:02:53.22 |
-13:13:30.6 |
HIP 98633 |
28.07 |
| 2026-04-07 00:00 |
20:02:53.78 |
-13:13:25.5 |
HIP 98633 |
28.21 |
| 2026-04-07 12:00 |
20:02:54.31 |
-13:13:20.5 |
HIP 98633 |
28.34 |
| 2026-04-08 00:00 |
20:02:54.82 |
-13:13:15.5 |
HIP 98633 |
28.47 |
| 2026-04-08 12:00 |
20:02:55.30 |
-13:13:10.6 |
HIP 98633 |
28.60 |
| 2026-04-09 00:00 |
20:02:55.76 |
-13:13:05.8 |
HIP 98633 |
28.73 |
| 2026-04-09 12:00 |
20:02:56.19 |
-13:13:01.0 |
HIP 98633 |
28.85 |
| 2026-04-10 00:00 |
20:02:56.60 |
-13:12:56.3 |
HIP 98633 |
28.96 |
| 2026-04-10 12:00 |
20:02:56.99 |
-13:12:51.7 |
HIP 98633 |
29.08 |
| 2026-04-11 00:00 |
20:02:57.35 |
-13:12:47.1 |
HIP 98633 |
29.19 |
| 2026-04-11 12:00 |
20:02:57.68 |
-13:12:42.6 |
HIP 98633 |
29.29 |
| 2026-04-12 00:00 |
20:02:57.99 |
-13:12:38.1 |
HIP 98633 |
29.39 |
| 2026-04-12 12:00 |
20:02:58.28 |
-13:12:33.7 |
HIP 98633 |
29.49 |
| 2026-04-13 00:00 |
20:02:58.54 |
-13:12:29.4 |
HIP 98633 |
29.59 |
| 2026-04-13 12:00 |
20:02:58.78 |
-13:12:25.2 |
HIP 98633 |
29.68 |
| 2026-04-14 00:00 |
20:02:58.99 |
-13:12:21.0 |
HIP 98633 |
29.76 |
| 2026-04-14 12:00 |
20:02:59.17 |
-13:12:16.9 |
HIP 98633 |
29.84 |
| 2026-04-15 00:00 |
20:02:59.34 |
-13:12:12.9 |
HIP 98633 |
29.92 |
| 2026-04-15 12:00 |
20:02:59.47 |
-13:12:08.9 |
HIP 98633 |
30.00 |
| 2026-04-16 00:00 |
20:02:59.58 |
-13:12:05.0 |
HIP 98633 |
30.07 |