メタデータ
| 項目 |
値 |
| Designation |
C/2012 U1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-07-04T17:20:39.560640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:25Z |
| Obs used |
172 |
| NEO |
- |
| M1 |
8.300 |
| 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) |
2013-12-31.0000000 |
| e |
0.99956488 |
| q (au) |
5.263903 |
| a (au) |
12097.722849 |
| i (deg) |
56.339020 |
| Ω (om, deg) |
26.982573 |
| ω (w, deg) |
70.049903 |
| M (ma, deg) |
359.999862 |
等級
散乱 + 全体線形
$$
M_a = (3.230 + 5.910\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.230 |
| n |
5.910 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
13:58:49.42 |
-26:15:15.4 |
HIP 68224 |
19.11 |
| 2026-03-26 12:00 |
13:58:44.97 |
-26:15:10.8 |
HIP 68224 |
18.47 |
| 2026-03-27 00:00 |
13:58:40.50 |
-26:15:06.0 |
HIP 68224 |
17.86 |
| 2026-03-27 12:00 |
13:58:36.01 |
-26:15:01.0 |
HIP 68224 |
17.28 |
| 2026-03-28 00:00 |
13:58:31.50 |
-26:14:55.7 |
HIP 68224 |
16.73 |
| 2026-03-28 12:00 |
13:58:26.98 |
-26:14:50.2 |
HIP 68224 |
16.23 |
| 2026-03-29 00:00 |
13:58:22.43 |
-26:14:44.5 |
HIP 68224 |
15.77 |
| 2026-03-29 12:00 |
13:58:17.86 |
-26:14:38.5 |
HIP 68224 |
15.36 |
| 2026-03-30 00:00 |
13:58:13.28 |
-26:14:32.2 |
HIP 68224 |
15.01 |
| 2026-03-30 12:00 |
13:58:08.68 |
-26:14:25.8 |
HIP 68224 |
14.71 |
| 2026-03-31 00:00 |
13:58:04.06 |
-26:14:19.1 |
HIP 68224 |
14.48 |
| 2026-03-31 12:00 |
13:57:59.43 |
-26:14:12.1 |
HIP 68224 |
14.32 |
| 2026-04-01 00:00 |
13:57:54.78 |
-26:14:05.0 |
HIP 68224 |
14.23 |
| 2026-04-01 12:00 |
13:57:50.11 |
-26:13:57.6 |
HIP 68224 |
14.21 |
| 2026-04-02 00:00 |
13:57:45.43 |
-26:13:49.9 |
HIP 68224 |
14.27 |
| 2026-04-02 12:00 |
13:57:40.73 |
-26:13:42.1 |
HIP 68224 |
14.40 |
| 2026-04-03 00:00 |
13:57:36.01 |
-26:13:34.0 |
HIP 68224 |
14.61 |
| 2026-04-03 12:00 |
13:57:31.29 |
-26:13:25.7 |
HIP 68224 |
14.89 |
| 2026-04-04 00:00 |
13:57:26.54 |
-26:13:17.1 |
HIP 68224 |
15.24 |
| 2026-04-04 12:00 |
13:57:21.79 |
-26:13:08.4 |
HIP 68224 |
15.65 |
| 2026-04-05 00:00 |
13:57:17.02 |
-26:12:59.4 |
HIP 68224 |
16.12 |
| 2026-04-05 12:00 |
13:57:12.24 |
-26:12:50.2 |
HIP 68224 |
16.65 |
| 2026-04-06 00:00 |
13:57:07.44 |
-26:12:40.7 |
HIP 68224 |
17.23 |
| 2026-04-06 12:00 |
13:57:02.63 |
-26:12:31.1 |
HIP 68224 |
17.86 |
| 2026-04-07 00:00 |
13:56:57.81 |
-26:12:21.2 |
HIP 68224 |
18.53 |
| 2026-04-07 12:00 |
13:56:52.98 |
-26:12:11.1 |
HIP 68224 |
19.24 |
| 2026-04-08 00:00 |
13:56:48.14 |
-26:12:00.8 |
HIP 68020 |
18.87 |
| 2026-04-08 12:00 |
13:56:43.29 |
-26:11:50.3 |
HIP 68020 |
17.94 |
| 2026-04-09 00:00 |
13:56:38.43 |
-26:11:39.6 |
HIP 68020 |
17.02 |
| 2026-04-09 12:00 |
13:56:33.56 |
-26:11:28.6 |
HIP 68020 |
16.13 |
| 2026-04-10 00:00 |
13:56:28.68 |
-26:11:17.5 |
HIP 68020 |
15.26 |
| 2026-04-10 12:00 |
13:56:23.79 |
-26:11:06.1 |
HIP 68020 |
14.41 |
| 2026-04-11 00:00 |
13:56:18.89 |
-26:10:54.5 |
HIP 68020 |
13.60 |
| 2026-04-11 12:00 |
13:56:13.98 |
-26:10:42.8 |
HIP 68020 |
12.84 |
| 2026-04-12 00:00 |
13:56:09.07 |
-26:10:30.8 |
HIP 68020 |
12.12 |
| 2026-04-12 12:00 |
13:56:04.14 |
-26:10:18.6 |
HIP 68020 |
11.47 |
| 2026-04-13 00:00 |
13:55:59.22 |
-26:10:06.2 |
HIP 68020 |
10.89 |
| 2026-04-13 12:00 |
13:55:54.28 |
-26:09:53.6 |
HIP 68020 |
10.39 |
| 2026-04-14 00:00 |
13:55:49.34 |
-26:09:40.9 |
HIP 68020 |
10.00 |
| 2026-04-14 12:00 |
13:55:44.39 |
-26:09:27.9 |
HIP 68020 |
9.71 |
| 2026-04-15 00:00 |
13:55:39.44 |
-26:09:14.7 |
HIP 68020 |
9.56 |
| 2026-04-15 12:00 |
13:55:34.49 |
-26:09:01.4 |
HIP 68020 |
9.53 |
| 2026-04-16 00:00 |
13:55:29.53 |
-26:08:47.8 |
HIP 68020 |
9.63 |