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) |
| 2026-09-25 00:00 |
19:51:42.21 |
-13:49:53.7 |
HIP 97618 |
19.16 |
| 2026-09-25 12:00 |
19:51:40.99 |
-13:50:03.9 |
HIP 97618 |
18.83 |
| 2026-09-26 00:00 |
19:51:39.79 |
-13:50:14.0 |
HIP 97618 |
18.50 |
| 2026-09-26 12:00 |
19:51:38.61 |
-13:50:24.1 |
HIP 97618 |
18.18 |
| 2026-09-27 00:00 |
19:51:37.46 |
-13:50:34.1 |
HIP 97618 |
17.86 |
| 2026-09-27 12:00 |
19:51:36.34 |
-13:50:44.1 |
HIP 97618 |
17.56 |
| 2026-09-28 00:00 |
19:51:35.23 |
-13:50:54.0 |
HIP 97618 |
17.25 |
| 2026-09-28 12:00 |
19:51:34.15 |
-13:51:03.9 |
HIP 97618 |
16.96 |
| 2026-09-29 00:00 |
19:51:33.09 |
-13:51:13.7 |
HIP 97618 |
16.67 |
| 2026-09-29 12:00 |
19:51:32.06 |
-13:51:23.5 |
HIP 97618 |
16.38 |
| 2026-09-30 00:00 |
19:51:31.05 |
-13:51:33.2 |
HIP 97618 |
16.11 |
| 2026-09-30 12:00 |
19:51:30.07 |
-13:51:42.9 |
HIP 97618 |
15.84 |
| 2026-10-01 00:00 |
19:51:29.11 |
-13:51:52.5 |
HIP 97618 |
15.57 |
| 2026-10-01 12:00 |
19:51:28.17 |
-13:52:02.1 |
HIP 97618 |
15.32 |
| 2026-10-02 00:00 |
19:51:27.26 |
-13:52:11.6 |
HIP 97618 |
15.06 |
| 2026-10-02 12:00 |
19:51:26.37 |
-13:52:21.0 |
HIP 97618 |
14.82 |
| 2026-10-03 00:00 |
19:51:25.51 |
-13:52:30.4 |
HIP 97618 |
14.58 |
| 2026-10-03 12:00 |
19:51:24.67 |
-13:52:39.7 |
HIP 97618 |
14.35 |
| 2026-10-04 00:00 |
19:51:23.85 |
-13:52:49.0 |
HIP 97618 |
14.13 |
| 2026-10-04 12:00 |
19:51:23.06 |
-13:52:58.2 |
HIP 97618 |
13.91 |
| 2026-10-05 00:00 |
19:51:22.30 |
-13:53:07.4 |
HIP 97618 |
13.70 |
| 2026-10-05 12:00 |
19:51:21.55 |
-13:53:16.5 |
HIP 97618 |
13.50 |
| 2026-10-06 00:00 |
19:51:20.84 |
-13:53:25.5 |
HIP 97618 |
13.31 |
| 2026-10-06 12:00 |
19:51:20.15 |
-13:53:34.5 |
HIP 97618 |
13.12 |
| 2026-10-07 00:00 |
19:51:19.48 |
-13:53:43.4 |
HIP 97618 |
12.94 |
| 2026-10-07 12:00 |
19:51:18.84 |
-13:53:52.3 |
HIP 97618 |
12.76 |
| 2026-10-08 00:00 |
19:51:18.22 |
-13:54:01.1 |
HIP 97618 |
12.60 |
| 2026-10-08 12:00 |
19:51:17.63 |
-13:54:09.8 |
HIP 97618 |
12.44 |
| 2026-10-09 00:00 |
19:51:17.06 |
-13:54:18.5 |
HIP 97618 |
12.29 |
| 2026-10-09 12:00 |
19:51:16.52 |
-13:54:27.1 |
HIP 97618 |
12.15 |
| 2026-10-10 00:00 |
19:51:16.01 |
-13:54:35.6 |
HIP 97618 |
12.01 |
| 2026-10-10 12:00 |
19:51:15.52 |
-13:54:44.1 |
HIP 97618 |
11.88 |
| 2026-10-11 00:00 |
19:51:15.05 |
-13:54:52.5 |
HIP 97618 |
11.76 |
| 2026-10-11 12:00 |
19:51:14.61 |
-13:55:00.8 |
HIP 97618 |
11.65 |
| 2026-10-12 00:00 |
19:51:14.19 |
-13:55:09.1 |
HIP 97618 |
11.54 |
| 2026-10-12 12:00 |
19:51:13.80 |
-13:55:17.3 |
HIP 97618 |
11.45 |
| 2026-10-13 00:00 |
19:51:13.44 |
-13:55:25.5 |
HIP 97618 |
11.36 |
| 2026-10-13 12:00 |
19:51:13.10 |
-13:55:33.6 |
HIP 97618 |
11.28 |
| 2026-10-14 00:00 |
19:51:12.79 |
-13:55:41.6 |
HIP 97618 |
11.20 |
| 2026-10-14 12:00 |
19:51:12.50 |
-13:55:49.5 |
HIP 97618 |
11.14 |
| 2026-10-15 00:00 |
19:51:12.23 |
-13:55:57.4 |
HIP 97618 |
11.08 |
| 2026-10-15 12:00 |
19:51:11.99 |
-13:56:05.2 |
HIP 97618 |
11.03 |
| 2026-10-16 00:00 |
19:51:11.78 |
-13:56:12.9 |
HIP 97618 |
10.98 |