メタデータ
| 項目 |
値 |
| Designation |
P/2015 P4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-01-19T00:45:47.321280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:13Z |
| Obs used |
80 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
28.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-09-21.0000000 |
| e |
0.58423891 |
| q (au) |
2.525162 |
| a (au) |
6.073589 |
| i (deg) |
8.713757 |
| Ω (om, deg) |
104.746924 |
| ω (w, deg) |
280.816811 |
| M (ma, deg) |
352.096266 |
等級
散乱 + 全体線形
$$
M_a = (11.240 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.240 |
| n |
6.000 |
| 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) |
| 2026-05-12 00:00 |
15:17:39.43 |
-09:50:22.5 |
HIP 74908 |
13.28 |
| 2026-05-12 12:00 |
15:17:27.70 |
-09:49:40.5 |
HIP 74908 |
15.96 |
| 2026-05-13 00:00 |
15:17:15.97 |
-09:48:58.7 |
HIP 74908 |
18.73 |
| 2026-05-13 12:00 |
15:17:04.24 |
-09:48:17.2 |
HIP 74908 |
21.56 |
| 2026-05-14 00:00 |
15:16:52.51 |
-09:47:35.9 |
HIP 74908 |
24.42 |
| 2026-05-14 12:00 |
15:16:40.77 |
-09:46:54.9 |
HIP 74785 |
24.43 |
| 2026-05-15 00:00 |
15:16:29.05 |
-09:46:14.2 |
HIP 74785 |
24.52 |
| 2026-05-15 12:00 |
15:16:17.32 |
-09:45:33.7 |
HIP 74785 |
24.97 |
| 2026-05-16 00:00 |
15:16:05.60 |
-09:44:53.6 |
HIP 74647 |
23.65 |
| 2026-05-16 12:00 |
15:15:53.89 |
-09:44:13.7 |
HIP 74647 |
22.63 |
| 2026-05-17 00:00 |
15:15:42.18 |
-09:43:34.1 |
HIP 74647 |
21.96 |
| 2026-05-17 12:00 |
15:15:30.49 |
-09:42:54.8 |
HIP 74647 |
21.67 |
| 2026-05-18 00:00 |
15:15:18.81 |
-09:42:15.9 |
HIP 74647 |
21.77 |
| 2026-05-18 12:00 |
15:15:07.14 |
-09:41:37.2 |
HIP 74548 |
20.99 |
| 2026-05-19 00:00 |
15:14:55.49 |
-09:40:58.9 |
HIP 74548 |
18.30 |
| 2026-05-19 12:00 |
15:14:43.85 |
-09:40:20.9 |
HIP 74548 |
15.71 |
| 2026-05-20 00:00 |
15:14:32.23 |
-09:39:43.2 |
HIP 74548 |
13.28 |
| 2026-05-20 12:00 |
15:14:20.63 |
-09:39:05.9 |
HIP 74548 |
11.09 |
| 2026-05-21 00:00 |
15:14:09.05 |
-09:38:28.9 |
HIP 74548 |
9.33 |
| 2026-05-21 12:00 |
15:13:57.49 |
-09:37:52.2 |
HIP 74548 |
8.26 |
| 2026-05-22 00:00 |
15:13:45.95 |
-09:37:15.9 |
HIP 74548 |
8.15 |
| 2026-05-22 12:00 |
15:13:34.44 |
-09:36:40.0 |
HIP 74548 |
9.03 |
| 2026-05-23 00:00 |
15:13:22.96 |
-09:36:04.4 |
HIP 74548 |
10.65 |
| 2026-05-23 12:00 |
15:13:11.50 |
-09:35:29.2 |
HIP 74548 |
12.73 |
| 2026-05-24 00:00 |
15:13:00.08 |
-09:34:54.3 |
HIP 74475 |
14.82 |
| 2026-05-24 12:00 |
15:12:48.68 |
-09:34:19.8 |
HIP 74475 |
15.84 |
| 2026-05-25 00:00 |
15:12:37.31 |
-09:33:45.7 |
HIP 74475 |
17.28 |
| 2026-05-25 12:00 |
15:12:25.98 |
-09:33:12.0 |
HIP 74410 |
17.54 |
| 2026-05-26 00:00 |
15:12:14.68 |
-09:32:38.6 |
HIP 74410 |
17.20 |
| 2026-05-26 12:00 |
15:12:03.42 |
-09:32:05.7 |
HIP 74410 |
17.32 |
| 2026-05-27 00:00 |
15:11:52.19 |
-09:31:33.1 |
HIP 74410 |
17.90 |
| 2026-05-27 12:00 |
15:11:41.00 |
-09:31:00.9 |
HIP 74410 |
18.88 |
| 2026-05-28 00:00 |
15:11:29.85 |
-09:30:29.2 |
HIP 74410 |
20.21 |
| 2026-05-28 12:00 |
15:11:18.74 |
-09:29:57.8 |
HIP 74410 |
21.82 |
| 2026-05-29 00:00 |
15:11:07.68 |
-09:29:26.9 |
HIP 74410 |
23.65 |
| 2026-05-29 12:00 |
15:10:56.65 |
-09:28:56.3 |
HIP 74410 |
25.64 |
| 2026-05-30 00:00 |
15:10:45.67 |
-09:28:26.2 |
HIP 74246 |
25.43 |
| 2026-05-30 12:00 |
15:10:34.73 |
-09:27:56.5 |
HIP 74246 |
25.43 |
| 2026-05-31 00:00 |
15:10:23.85 |
-09:27:27.2 |
HIP 74246 |
25.72 |
| 2026-05-31 12:00 |
15:10:13.00 |
-09:26:58.4 |
HIP 74246 |
26.28 |
| 2026-06-01 00:00 |
15:10:02.21 |
-09:26:30.0 |
HIP 74246 |
27.10 |
| 2026-06-01 12:00 |
15:09:51.47 |
-09:26:02.0 |
HIP 74246 |
28.14 |
| 2026-06-02 00:00 |
15:09:40.78 |
-09:25:34.5 |
HIP 74246 |
29.38 |