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) |
| 2026-06-01 00:00 |
20:01:26.43 |
-13:11:53.1 |
HIP 98463 |
20.92 |
| 2026-06-01 12:00 |
20:01:24.39 |
-13:11:57.0 |
HIP 98463 |
20.56 |
| 2026-06-02 00:00 |
20:01:22.33 |
-13:12:00.9 |
HIP 98463 |
20.20 |
| 2026-06-02 12:00 |
20:01:20.26 |
-13:12:05.0 |
HIP 98463 |
19.84 |
| 2026-06-03 00:00 |
20:01:18.16 |
-13:12:09.1 |
HIP 98463 |
19.49 |
| 2026-06-03 12:00 |
20:01:16.05 |
-13:12:13.3 |
HIP 98463 |
19.14 |
| 2026-06-04 00:00 |
20:01:13.91 |
-13:12:17.6 |
HIP 98463 |
18.80 |
| 2026-06-04 12:00 |
20:01:11.76 |
-13:12:21.9 |
HIP 98463 |
18.47 |
| 2026-06-05 00:00 |
20:01:09.59 |
-13:12:26.4 |
HIP 98463 |
18.14 |
| 2026-06-05 12:00 |
20:01:07.41 |
-13:12:30.9 |
HIP 98463 |
17.82 |
| 2026-06-06 00:00 |
20:01:05.20 |
-13:12:35.6 |
HIP 98463 |
17.51 |
| 2026-06-06 12:00 |
20:01:02.98 |
-13:12:40.3 |
HIP 98463 |
17.21 |
| 2026-06-07 00:00 |
20:01:00.74 |
-13:12:45.1 |
HIP 98463 |
16.92 |
| 2026-06-07 12:00 |
20:00:58.49 |
-13:12:50.0 |
HIP 98463 |
16.64 |
| 2026-06-08 00:00 |
20:00:56.22 |
-13:12:54.9 |
HIP 98463 |
16.37 |
| 2026-06-08 12:00 |
20:00:53.93 |
-13:13:00.0 |
HIP 98463 |
16.12 |
| 2026-06-09 00:00 |
20:00:51.62 |
-13:13:05.1 |
HIP 98463 |
15.88 |
| 2026-06-09 12:00 |
20:00:49.30 |
-13:13:10.3 |
HIP 98463 |
15.66 |
| 2026-06-10 00:00 |
20:00:46.96 |
-13:13:15.6 |
HIP 98463 |
15.46 |
| 2026-06-10 12:00 |
20:00:44.60 |
-13:13:21.0 |
HIP 98463 |
15.27 |
| 2026-06-11 00:00 |
20:00:42.23 |
-13:13:26.4 |
HIP 98463 |
15.10 |
| 2026-06-11 12:00 |
20:00:39.84 |
-13:13:32.0 |
HIP 98463 |
14.96 |
| 2026-06-12 00:00 |
20:00:37.44 |
-13:13:37.6 |
HIP 98463 |
14.84 |
| 2026-06-12 12:00 |
20:00:35.02 |
-13:13:43.3 |
HIP 98463 |
14.74 |
| 2026-06-13 00:00 |
20:00:32.58 |
-13:13:49.1 |
HIP 98463 |
14.66 |
| 2026-06-13 12:00 |
20:00:30.13 |
-13:13:55.0 |
HIP 98463 |
14.61 |
| 2026-06-14 00:00 |
20:00:27.67 |
-13:14:01.0 |
HIP 98463 |
14.58 |
| 2026-06-14 12:00 |
20:00:25.18 |
-13:14:07.0 |
HIP 98463 |
14.58 |
| 2026-06-15 00:00 |
20:00:22.69 |
-13:14:13.1 |
HIP 98463 |
14.61 |
| 2026-06-15 12:00 |
20:00:20.18 |
-13:14:19.3 |
HIP 98463 |
14.66 |
| 2026-06-16 00:00 |
20:00:17.66 |
-13:14:25.6 |
HIP 98463 |
14.75 |
| 2026-06-16 12:00 |
20:00:15.12 |
-13:14:31.9 |
HIP 98463 |
14.85 |
| 2026-06-17 00:00 |
20:00:12.56 |
-13:14:38.4 |
HIP 98463 |
14.99 |
| 2026-06-17 12:00 |
20:00:10.00 |
-13:14:44.9 |
HIP 98463 |
15.15 |
| 2026-06-18 00:00 |
20:00:07.42 |
-13:14:51.5 |
HIP 98463 |
15.34 |
| 2026-06-18 12:00 |
20:00:04.83 |
-13:14:58.1 |
HIP 98463 |
15.55 |
| 2026-06-19 00:00 |
20:00:02.22 |
-13:15:04.9 |
HIP 98463 |
15.79 |
| 2026-06-19 12:00 |
19:59:59.60 |
-13:15:11.7 |
HIP 98352 |
15.57 |
| 2026-06-20 00:00 |
19:59:56.97 |
-13:15:18.6 |
HIP 98352 |
14.92 |
| 2026-06-20 12:00 |
19:59:54.32 |
-13:15:25.6 |
HIP 98352 |
14.27 |
| 2026-06-21 00:00 |
19:59:51.67 |
-13:15:32.7 |
HIP 98352 |
13.61 |
| 2026-06-21 12:00 |
19:59:49.00 |
-13:15:39.8 |
HIP 98352 |
12.95 |
| 2026-06-22 00:00 |
19:59:46.32 |
-13:15:47.0 |
HIP 98352 |
12.29 |