メタデータ
| 項目 |
値 |
| Designation |
C/2003 U1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-11-03T09:32:56.417280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:34Z |
| Obs used |
188 |
| NEO |
- |
| M1 |
15.200 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2003-11-05.0000000 |
| e |
0.92158501 |
| q (au) |
1.795717 |
| a (au) |
22.900172 |
| i (deg) |
164.474530 |
| Ω (om, deg) |
322.763107 |
| ω (w, deg) |
278.383793 |
| M (ma, deg) |
0.014409 |
等級
散乱 + 全体線形
$$
M_a = (16.162 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.162 |
| n |
2.000 |
| gf |
0.993 |
| gb |
-1.000 |
| k |
0.990 |
| δ90 |
5.241 |
| 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 |
15:49:13.56 |
-04:00:59.0 |
HIP 77542 |
12.42 |
| 2026-07-29 12:00 |
15:49:12.01 |
-04:01:07.4 |
HIP 77464 |
12.60 |
| 2026-07-30 00:00 |
15:49:10.49 |
-04:01:15.9 |
HIP 77464 |
12.62 |
| 2026-07-30 12:00 |
15:49:08.99 |
-04:01:24.6 |
HIP 77464 |
12.67 |
| 2026-07-31 00:00 |
15:49:07.52 |
-04:01:33.4 |
HIP 77464 |
12.73 |
| 2026-07-31 12:00 |
15:49:06.08 |
-04:01:42.4 |
HIP 77464 |
12.80 |
| 2026-08-01 00:00 |
15:49:04.67 |
-04:01:51.4 |
HIP 77464 |
12.90 |
| 2026-08-01 12:00 |
15:49:03.28 |
-04:02:00.6 |
HIP 77464 |
13.00 |
| 2026-08-02 00:00 |
15:49:01.93 |
-04:02:09.9 |
HIP 77464 |
13.12 |
| 2026-08-02 12:00 |
15:49:00.60 |
-04:02:19.4 |
HIP 77464 |
13.24 |
| 2026-08-03 00:00 |
15:48:59.29 |
-04:02:28.9 |
HIP 77464 |
13.38 |
| 2026-08-03 12:00 |
15:48:58.02 |
-04:02:38.6 |
HIP 77464 |
13.53 |
| 2026-08-04 00:00 |
15:48:56.78 |
-04:02:48.4 |
HIP 77464 |
13.69 |
| 2026-08-04 12:00 |
15:48:55.56 |
-04:02:58.3 |
HIP 77464 |
13.86 |
| 2026-08-05 00:00 |
15:48:54.37 |
-04:03:08.4 |
HIP 77464 |
14.04 |
| 2026-08-05 12:00 |
15:48:53.21 |
-04:03:18.5 |
HIP 77464 |
14.23 |
| 2026-08-06 00:00 |
15:48:52.08 |
-04:03:28.8 |
HIP 77464 |
14.42 |
| 2026-08-06 12:00 |
15:48:50.98 |
-04:03:39.2 |
HIP 77464 |
14.61 |
| 2026-08-07 00:00 |
15:48:49.90 |
-04:03:49.7 |
HIP 77464 |
14.82 |
| 2026-08-07 12:00 |
15:48:48.86 |
-04:04:00.3 |
HIP 77464 |
15.03 |
| 2026-08-08 00:00 |
15:48:47.84 |
-04:04:11.1 |
HIP 77464 |
15.24 |
| 2026-08-08 12:00 |
15:48:46.85 |
-04:04:22.0 |
HIP 77464 |
15.46 |
| 2026-08-09 00:00 |
15:48:45.89 |
-04:04:32.9 |
HIP 77464 |
15.68 |
| 2026-08-09 12:00 |
15:48:44.96 |
-04:04:44.0 |
HIP 77464 |
15.90 |
| 2026-08-10 00:00 |
15:48:44.06 |
-04:04:55.2 |
HIP 77464 |
16.13 |
| 2026-08-10 12:00 |
15:48:43.19 |
-04:05:06.6 |
HIP 77464 |
16.35 |
| 2026-08-11 00:00 |
15:48:42.35 |
-04:05:18.0 |
HIP 77464 |
16.59 |
| 2026-08-11 12:00 |
15:48:41.54 |
-04:05:29.5 |
HIP 77464 |
16.82 |
| 2026-08-12 00:00 |
15:48:40.75 |
-04:05:41.2 |
HIP 77464 |
17.05 |
| 2026-08-12 12:00 |
15:48:40.00 |
-04:05:52.9 |
HIP 77464 |
17.29 |
| 2026-08-13 00:00 |
15:48:39.27 |
-04:06:04.8 |
HIP 77464 |
17.52 |
| 2026-08-13 12:00 |
15:48:38.57 |
-04:06:16.8 |
HIP 77464 |
17.76 |
| 2026-08-14 00:00 |
15:48:37.91 |
-04:06:28.8 |
HIP 77464 |
18.00 |
| 2026-08-14 12:00 |
15:48:37.27 |
-04:06:41.0 |
HIP 77464 |
18.24 |
| 2026-08-15 00:00 |
15:48:36.66 |
-04:06:53.3 |
HIP 77464 |
18.47 |
| 2026-08-15 12:00 |
15:48:36.08 |
-04:07:05.7 |
HIP 77464 |
18.71 |
| 2026-08-16 00:00 |
15:48:35.53 |
-04:07:18.1 |
HIP 77464 |
18.95 |
| 2026-08-16 12:00 |
15:48:35.01 |
-04:07:30.7 |
HIP 77464 |
19.19 |
| 2026-08-17 00:00 |
15:48:34.52 |
-04:07:43.4 |
HIP 77464 |
19.42 |
| 2026-08-17 12:00 |
15:48:34.06 |
-04:07:56.2 |
HIP 77464 |
19.66 |
| 2026-08-18 00:00 |
15:48:33.63 |
-04:08:09.0 |
HIP 77464 |
19.90 |
| 2026-08-18 12:00 |
15:48:33.22 |
-04:08:22.0 |
HIP 77464 |
20.13 |
| 2026-08-19 00:00 |
15:48:32.85 |
-04:08:35.0 |
HIP 77464 |
20.37 |