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) |
| 2026-09-20 00:00 |
15:28:43.58 |
-23:59:18.5 |
HIP 75801 |
18.27 |
| 2026-09-20 12:00 |
15:29:16.85 |
-24:00:55.7 |
HIP 75801 |
19.06 |
| 2026-09-21 00:00 |
15:29:50.31 |
-24:02:33.2 |
HIP 75907 |
13.17 |
| 2026-09-21 12:00 |
15:30:23.95 |
-24:04:11.1 |
HIP 75907 |
10.25 |
| 2026-09-22 00:00 |
15:30:57.78 |
-24:05:49.3 |
HIP 75907 |
12.67 |
| 2026-09-22 12:00 |
15:31:31.78 |
-24:07:27.9 |
HIP 75934 |
16.76 |
| 2026-09-23 00:00 |
15:32:05.97 |
-24:09:06.8 |
HIP 76075 |
16.44 |
| 2026-09-23 12:00 |
15:32:40.33 |
-24:10:45.9 |
HIP 76075 |
18.85 |
| 2026-09-24 00:00 |
15:33:14.88 |
-24:12:25.4 |
HIP 76143 |
17.04 |
| 2026-09-24 12:00 |
15:33:49.60 |
-24:14:05.2 |
HIP 76143 |
17.84 |
| 2026-09-25 00:00 |
15:34:24.50 |
-24:15:45.2 |
HIP 76313 |
12.73 |
| 2026-09-25 12:00 |
15:34:59.58 |
-24:17:25.5 |
HIP 76313 |
4.82 |
| 2026-09-26 00:00 |
15:35:34.83 |
-24:19:06.1 |
HIP 76313 |
4.24 |
| 2026-09-26 12:00 |
15:36:10.26 |
-24:20:46.9 |
HIP 76313 |
12.18 |
| 2026-09-27 00:00 |
15:36:45.86 |
-24:22:28.0 |
HIP 76313 |
20.40 |
| 2026-09-27 12:00 |
15:37:21.64 |
-24:24:09.2 |
HIP 76578 |
20.46 |
| 2026-09-28 00:00 |
15:37:57.59 |
-24:25:50.8 |
HIP 76578 |
14.56 |
| 2026-09-28 12:00 |
15:38:33.72 |
-24:27:32.5 |
HIP 76578 |
12.05 |
| 2026-09-29 00:00 |
15:39:10.02 |
-24:29:14.4 |
HIP 76578 |
14.82 |
| 2026-09-29 12:00 |
15:39:46.49 |
-24:30:56.6 |
HIP 76812 |
20.36 |
| 2026-09-30 00:00 |
15:40:23.13 |
-24:32:38.9 |
HIP 76834 |
14.81 |
| 2026-09-30 12:00 |
15:40:59.95 |
-24:34:21.4 |
HIP 76834 |
11.03 |
| 2026-10-01 00:00 |
15:41:36.93 |
-24:36:04.1 |
HIP 76834 |
13.07 |
| 2026-10-01 12:00 |
15:42:14.09 |
-24:37:46.9 |
HIP 76834 |
19.19 |
| 2026-10-02 00:00 |
15:42:51.41 |
-24:39:29.9 |
HIP 76969 |
23.66 |
| 2026-10-02 12:00 |
15:43:28.91 |
-24:41:13.0 |
HIP 77077 |
20.71 |
| 2026-10-03 00:00 |
15:44:06.57 |
-24:42:56.3 |
HIP 77077 |
19.38 |
| 2026-10-03 12:00 |
15:44:44.40 |
-24:44:39.7 |
HIP 77184 |
12.45 |
| 2026-10-04 00:00 |
15:45:22.40 |
-24:46:23.2 |
HIP 77184 |
3.78 |
| 2026-10-04 12:00 |
15:46:00.57 |
-24:48:06.8 |
HIP 77184 |
5.36 |
| 2026-10-05 00:00 |
15:46:38.91 |
-24:49:50.6 |
HIP 77184 |
14.15 |
| 2026-10-05 12:00 |
15:47:17.41 |
-24:51:34.4 |
HIP 77184 |
23.04 |
| 2026-10-06 00:00 |
15:47:56.08 |
-24:53:18.3 |
HIP 77399 |
19.70 |
| 2026-10-06 12:00 |
15:48:34.91 |
-24:55:02.2 |
HIP 77399 |
19.27 |
| 2026-10-07 00:00 |
15:49:13.91 |
-24:56:46.2 |
HIP 77545 |
16.09 |
| 2026-10-07 12:00 |
15:49:53.08 |
-24:58:30.3 |
HIP 77545 |
10.66 |
| 2026-10-08 00:00 |
15:50:32.40 |
-25:00:14.4 |
HIP 77545 |
11.50 |
| 2026-10-08 12:00 |
15:51:11.89 |
-25:01:58.6 |
HIP 77545 |
17.79 |
| 2026-10-09 00:00 |
15:51:51.55 |
-25:03:42.7 |
HIP 77754 |
10.33 |
| 2026-10-09 12:00 |
15:52:31.36 |
-25:05:26.9 |
HIP 77754 |
4.63 |
| 2026-10-10 00:00 |
15:53:11.34 |
-25:07:11.1 |
HIP 77754 |
10.27 |
| 2026-10-10 12:00 |
15:53:51.48 |
-25:08:55.3 |
HIP 77840 |
11.21 |
| 2026-10-11 00:00 |
15:54:31.77 |
-25:10:39.4 |
HIP 77909 |
4.34 |