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) |
| 2026-09-20 00:00 |
15:09:16.55 |
-11:04:37.7 |
HIP 74194 |
30.37 |
| 2026-09-20 12:00 |
15:09:27.51 |
-11:05:45.3 |
HIP 74313 |
28.03 |
| 2026-09-21 00:00 |
15:09:38.55 |
-11:06:53.0 |
HIP 74313 |
25.46 |
| 2026-09-21 12:00 |
15:09:49.66 |
-11:08:00.8 |
HIP 74313 |
22.97 |
| 2026-09-22 00:00 |
15:10:00.85 |
-11:09:08.8 |
HIP 74313 |
20.58 |
| 2026-09-22 12:00 |
15:10:12.12 |
-11:10:16.9 |
HIP 74313 |
18.34 |
| 2026-09-23 00:00 |
15:10:23.46 |
-11:11:25.2 |
HIP 74313 |
16.33 |
| 2026-09-23 12:00 |
15:10:34.87 |
-11:12:33.5 |
HIP 74313 |
14.65 |
| 2026-09-24 00:00 |
15:10:46.36 |
-11:13:42.0 |
HIP 74313 |
13.44 |
| 2026-09-24 12:00 |
15:10:57.92 |
-11:14:50.6 |
HIP 74313 |
12.84 |
| 2026-09-25 00:00 |
15:11:09.55 |
-11:15:59.3 |
HIP 74311 |
12.60 |
| 2026-09-25 12:00 |
15:11:21.26 |
-11:17:08.1 |
HIP 74311 |
11.15 |
| 2026-09-26 00:00 |
15:11:33.04 |
-11:18:17.0 |
HIP 74311 |
10.45 |
| 2026-09-26 12:00 |
15:11:44.89 |
-11:19:26.0 |
HIP 74311 |
10.66 |
| 2026-09-27 00:00 |
15:11:56.81 |
-11:20:35.1 |
HIP 74311 |
11.74 |
| 2026-09-27 12:00 |
15:12:08.80 |
-11:21:44.3 |
HIP 74311 |
13.49 |
| 2026-09-28 00:00 |
15:12:20.86 |
-11:22:53.6 |
HIP 74311 |
15.70 |
| 2026-09-28 12:00 |
15:12:32.99 |
-11:24:02.9 |
HIP 74311 |
18.22 |
| 2026-09-29 00:00 |
15:12:45.19 |
-11:25:12.4 |
HIP 74311 |
20.94 |
| 2026-09-29 12:00 |
15:12:57.45 |
-11:26:22.0 |
HIP 74311 |
23.79 |
| 2026-09-30 00:00 |
15:13:09.79 |
-11:27:31.6 |
HIP 74311 |
26.75 |
| 2026-09-30 12:00 |
15:13:22.19 |
-11:28:41.3 |
HIP 74488 |
28.33 |
| 2026-10-01 00:00 |
15:13:34.66 |
-11:29:51.1 |
HIP 74659 |
26.95 |
| 2026-10-01 12:00 |
15:13:47.19 |
-11:31:00.9 |
HIP 74659 |
24.08 |
| 2026-10-02 00:00 |
15:13:59.80 |
-11:32:10.8 |
HIP 74659 |
21.31 |
| 2026-10-02 12:00 |
15:14:12.46 |
-11:33:20.8 |
HIP 74659 |
18.69 |
| 2026-10-03 00:00 |
15:14:25.20 |
-11:34:30.9 |
HIP 74659 |
16.32 |
| 2026-10-03 12:00 |
15:14:37.99 |
-11:35:40.9 |
HIP 74659 |
14.33 |
| 2026-10-04 00:00 |
15:14:50.86 |
-11:36:51.1 |
HIP 74659 |
12.90 |
| 2026-10-04 12:00 |
15:15:03.78 |
-11:38:01.3 |
HIP 74659 |
12.24 |
| 2026-10-05 00:00 |
15:15:16.77 |
-11:39:11.6 |
HIP 74659 |
12.50 |
| 2026-10-05 12:00 |
15:15:29.82 |
-11:40:21.9 |
HIP 74659 |
13.62 |
| 2026-10-06 00:00 |
15:15:42.93 |
-11:41:32.2 |
HIP 74659 |
15.43 |
| 2026-10-06 12:00 |
15:15:56.11 |
-11:42:42.6 |
HIP 74659 |
17.73 |
| 2026-10-07 00:00 |
15:16:09.35 |
-11:43:53.0 |
HIP 74659 |
20.36 |
| 2026-10-07 12:00 |
15:16:22.64 |
-11:45:03.4 |
HIP 74659 |
23.22 |
| 2026-10-08 00:00 |
15:16:36.00 |
-11:46:13.9 |
HIP 74659 |
26.23 |
| 2026-10-08 12:00 |
15:16:49.42 |
-11:47:24.3 |
HIP 74659 |
29.35 |
| 2026-10-09 00:00 |
15:17:02.89 |
-11:48:34.9 |
HIP 74659 |
32.56 |
| 2026-10-09 12:00 |
15:17:16.42 |
-11:49:45.4 |
HIP 74659 |
35.84 |
| 2026-10-10 00:00 |
15:17:30.01 |
-11:50:55.9 |
HIP 74659 |
39.17 |
| 2026-10-10 12:00 |
15:17:43.66 |
-11:52:06.4 |
HIP 74659 |
42.54 |
| 2026-10-11 00:00 |
15:17:57.37 |
-11:53:17.0 |
HIP 75064 |
39.75 |