P/2014 U4 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
P/2014 U4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-08-03T22:12:56.600640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:01Z |
| Obs used |
61 |
| NEO |
- |
| M1 |
19.100 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-10-27.0000000 |
| e |
0.47100403 |
| q (au) |
1.843417 |
| a (au) |
3.484747 |
| i (deg) |
6.456987 |
| Ω (om, deg) |
12.045421 |
| ω (w, deg) |
347.730100 |
| M (ma, deg) |
12.738279 |
等級
散乱 + 全体線形
$$
M_a = (17.883 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.883 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.634 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
15:35:45.66 |
-22:42:20.4 |
HIP 76268 |
15.21 |
| 2026-02-03 12:00 |
15:36:04.76 |
-22:44:02.3 |
HIP 76268 |
19.23 |
| 2026-02-04 00:00 |
15:36:23.69 |
-22:45:43.8 |
HIP 76268 |
23.47 |
| 2026-02-04 12:00 |
15:36:42.47 |
-22:47:24.8 |
HIP 76532 |
25.93 |
| 2026-02-05 00:00 |
15:37:01.08 |
-22:49:05.4 |
HIP 76532 |
22.21 |
| 2026-02-05 12:00 |
15:37:19.53 |
-22:50:45.4 |
HIP 76532 |
18.91 |
| 2026-02-06 00:00 |
15:37:37.82 |
-22:52:25.0 |
HIP 76532 |
16.25 |
| 2026-02-06 12:00 |
15:37:55.94 |
-22:54:04.1 |
HIP 76614 |
14.30 |
| 2026-02-07 00:00 |
15:38:13.89 |
-22:55:42.7 |
HIP 76614 |
10.13 |
| 2026-02-07 12:00 |
15:38:31.67 |
-22:57:20.8 |
HIP 76614 |
6.36 |
| 2026-02-08 00:00 |
15:38:49.28 |
-22:58:58.4 |
HIP 76614 |
4.14 |
| 2026-02-08 12:00 |
15:39:06.72 |
-23:00:35.6 |
HIP 76614 |
5.62 |
| 2026-02-09 00:00 |
15:39:23.99 |
-23:02:12.2 |
HIP 76666 |
6.83 |
| 2026-02-09 12:00 |
15:39:41.08 |
-23:03:48.3 |
HIP 76666 |
6.90 |
| 2026-02-10 00:00 |
15:39:57.99 |
-23:05:24.0 |
HIP 76666 |
9.16 |
| 2026-02-10 12:00 |
15:40:14.72 |
-23:06:59.1 |
HIP 76666 |
12.43 |
| 2026-02-11 00:00 |
15:40:31.27 |
-23:08:33.8 |
HIP 76666 |
16.07 |
| 2026-02-11 12:00 |
15:40:47.63 |
-23:10:07.9 |
HIP 76874 |
16.29 |
| 2026-02-12 00:00 |
15:41:03.82 |
-23:11:41.6 |
HIP 76874 |
12.25 |
| 2026-02-12 12:00 |
15:41:19.81 |
-23:13:14.7 |
HIP 76874 |
8.26 |
| 2026-02-13 00:00 |
15:41:35.62 |
-23:14:47.4 |
HIP 76874 |
4.32 |
| 2026-02-13 12:00 |
15:41:51.24 |
-23:16:19.5 |
HIP 76874 |
0.45 |
| 2026-02-14 00:00 |
15:42:06.67 |
-23:17:51.1 |
HIP 76874 |
3.45 |
| 2026-02-14 12:00 |
15:42:21.91 |
-23:19:22.2 |
HIP 76874 |
7.26 |
| 2026-02-15 00:00 |
15:42:36.95 |
-23:20:52.8 |
HIP 76874 |
11.03 |
| 2026-02-15 12:00 |
15:42:51.79 |
-23:22:22.9 |
HIP 76874 |
14.75 |
| 2026-02-16 00:00 |
15:43:06.44 |
-23:23:52.4 |
HIP 76874 |
18.43 |
| 2026-02-16 12:00 |
15:43:20.89 |
-23:25:21.4 |
HIP 76874 |
22.06 |
| 2026-02-17 00:00 |
15:43:35.14 |
-23:26:50.0 |
HIP 76874 |
25.65 |
| 2026-02-17 12:00 |
15:43:49.18 |
-23:28:17.9 |
HIP 77177 |
23.06 |
| 2026-02-18 00:00 |
15:44:03.02 |
-23:29:45.4 |
HIP 77177 |
19.79 |
| 2026-02-18 12:00 |
15:44:16.66 |
-23:31:12.3 |
HIP 77177 |
16.66 |
| 2026-02-19 00:00 |
15:44:30.08 |
-23:32:38.7 |
HIP 77177 |
13.72 |
| 2026-02-19 12:00 |
15:44:43.30 |
-23:34:04.6 |
HIP 77177 |
11.10 |
| 2026-02-20 00:00 |
15:44:56.31 |
-23:35:30.0 |
HIP 77177 |
9.02 |
| 2026-02-20 12:00 |
15:45:09.11 |
-23:36:54.8 |
HIP 77177 |
7.85 |
| 2026-02-21 00:00 |
15:45:21.69 |
-23:38:19.1 |
HIP 77177 |
7.95 |
| 2026-02-21 12:00 |
15:45:34.06 |
-23:39:42.8 |
HIP 77177 |
9.22 |
| 2026-02-22 00:00 |
15:45:46.21 |
-23:41:06.0 |
HIP 77177 |
11.23 |
| 2026-02-22 12:00 |
15:45:58.15 |
-23:42:28.7 |
HIP 77177 |
13.63 |
| 2026-02-23 00:00 |
15:46:09.86 |
-23:43:50.8 |
HIP 77177 |
16.21 |
| 2026-02-23 12:00 |
15:46:21.36 |
-23:45:12.4 |
HIP 77177 |
18.89 |
| 2026-02-24 00:00 |
15:46:32.63 |
-23:46:33.4 |
HIP 77177 |
21.60 |