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) |
| 2026-07-29 00:00 |
19:56:09.13 |
-13:27:32.9 |
HIP 98109 |
6.93 |
| 2026-07-29 12:00 |
19:56:06.14 |
-13:27:44.3 |
HIP 98109 |
7.34 |
| 2026-07-30 00:00 |
19:56:03.16 |
-13:27:55.6 |
HIP 98109 |
7.80 |
| 2026-07-30 12:00 |
19:56:00.19 |
-13:28:07.0 |
HIP 98109 |
8.30 |
| 2026-07-31 00:00 |
19:55:57.22 |
-13:28:18.4 |
HIP 98109 |
8.83 |
| 2026-07-31 12:00 |
19:55:54.25 |
-13:28:29.9 |
HIP 98109 |
9.40 |
| 2026-08-01 00:00 |
19:55:51.29 |
-13:28:41.4 |
HIP 98109 |
9.99 |
| 2026-08-01 12:00 |
19:55:48.34 |
-13:28:52.9 |
HIP 98109 |
10.59 |
| 2026-08-02 00:00 |
19:55:45.39 |
-13:29:04.4 |
HIP 98109 |
11.22 |
| 2026-08-02 12:00 |
19:55:42.45 |
-13:29:16.0 |
HIP 98109 |
11.85 |
| 2026-08-03 00:00 |
19:55:39.51 |
-13:29:27.5 |
HIP 98109 |
12.50 |
| 2026-08-03 12:00 |
19:55:36.58 |
-13:29:39.2 |
HIP 98109 |
13.16 |
| 2026-08-04 00:00 |
19:55:33.65 |
-13:29:50.8 |
HIP 98109 |
13.82 |
| 2026-08-04 12:00 |
19:55:30.73 |
-13:30:02.4 |
HIP 98109 |
14.49 |
| 2026-08-05 00:00 |
19:55:27.82 |
-13:30:14.1 |
HIP 98109 |
15.16 |
| 2026-08-05 12:00 |
19:55:24.92 |
-13:30:25.8 |
HIP 98109 |
15.84 |
| 2026-08-06 00:00 |
19:55:22.02 |
-13:30:37.6 |
HIP 98109 |
16.53 |
| 2026-08-06 12:00 |
19:55:19.13 |
-13:30:49.3 |
HIP 98014 |
16.53 |
| 2026-08-07 00:00 |
19:55:16.24 |
-13:31:01.1 |
HIP 98014 |
16.21 |
| 2026-08-07 12:00 |
19:55:13.37 |
-13:31:12.9 |
HIP 98014 |
15.91 |
| 2026-08-08 00:00 |
19:55:10.50 |
-13:31:24.7 |
HIP 98014 |
15.64 |
| 2026-08-08 12:00 |
19:55:07.64 |
-13:31:36.5 |
HIP 98014 |
15.40 |
| 2026-08-09 00:00 |
19:55:04.79 |
-13:31:48.3 |
HIP 98014 |
15.20 |
| 2026-08-09 12:00 |
19:55:01.95 |
-13:32:00.2 |
HIP 98014 |
15.02 |
| 2026-08-10 00:00 |
19:54:59.12 |
-13:32:12.1 |
HIP 98014 |
14.88 |
| 2026-08-10 12:00 |
19:54:56.30 |
-13:32:24.0 |
HIP 98014 |
14.76 |
| 2026-08-11 00:00 |
19:54:53.48 |
-13:32:35.9 |
HIP 98014 |
14.69 |
| 2026-08-11 12:00 |
19:54:50.68 |
-13:32:47.8 |
HIP 98014 |
14.64 |
| 2026-08-12 00:00 |
19:54:47.89 |
-13:32:59.7 |
HIP 98014 |
14.63 |
| 2026-08-12 12:00 |
19:54:45.10 |
-13:33:11.7 |
HIP 98014 |
14.65 |
| 2026-08-13 00:00 |
19:54:42.33 |
-13:33:23.6 |
HIP 98014 |
14.70 |
| 2026-08-13 12:00 |
19:54:39.56 |
-13:33:35.6 |
HIP 98014 |
14.79 |
| 2026-08-14 00:00 |
19:54:36.81 |
-13:33:47.6 |
HIP 98014 |
14.91 |
| 2026-08-14 12:00 |
19:54:34.07 |
-13:33:59.6 |
HIP 98014 |
15.05 |
| 2026-08-15 00:00 |
19:54:31.34 |
-13:34:11.6 |
HIP 98014 |
15.23 |
| 2026-08-15 12:00 |
19:54:28.62 |
-13:34:23.6 |
HIP 98014 |
15.43 |
| 2026-08-16 00:00 |
19:54:25.91 |
-13:34:35.6 |
HIP 98014 |
15.66 |
| 2026-08-16 12:00 |
19:54:23.22 |
-13:34:47.6 |
HIP 98014 |
15.92 |
| 2026-08-17 00:00 |
19:54:20.53 |
-13:34:59.6 |
HIP 98014 |
16.19 |
| 2026-08-17 12:00 |
19:54:17.86 |
-13:35:11.6 |
HIP 98014 |
16.49 |
| 2026-08-18 00:00 |
19:54:15.20 |
-13:35:23.7 |
HIP 98014 |
16.81 |
| 2026-08-18 12:00 |
19:54:12.56 |
-13:35:35.7 |
HIP 98014 |
17.15 |
| 2026-08-19 00:00 |
19:54:09.92 |
-13:35:47.7 |
HIP 98014 |
17.50 |