メタデータ
| 項目 |
値 |
| Designation |
P/2015 A3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-02-22T20:59:44.802240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:05Z |
| Obs used |
57 |
| NEO |
Yes |
| M1 |
20.700 |
| 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) |
2015-02-14.0000000 |
| e |
0.84590960 |
| q (au) |
1.152929 |
| a (au) |
7.482163 |
| i (deg) |
172.510659 |
| Ω (om, deg) |
277.075159 |
| ω (w, deg) |
249.619923 |
| M (ma, deg) |
359.572611 |
等級
散乱 + 全体線形
$$
M_a = (20.000 + 3.323\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
20.000 |
| n |
3.323 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.939 |
| 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) |
| 2026-07-29 00:00 |
13:24:04.10 |
-01:15:57.8 |
HIP 65545 |
32.14 |
| 2026-07-29 12:00 |
13:24:05.06 |
-01:16:19.1 |
HIP 65545 |
31.96 |
| 2026-07-30 00:00 |
13:24:06.08 |
-01:16:40.8 |
HIP 65545 |
31.76 |
| 2026-07-30 12:00 |
13:24:07.16 |
-01:17:02.8 |
HIP 65545 |
31.56 |
| 2026-07-31 00:00 |
13:24:08.31 |
-01:17:25.1 |
HIP 65545 |
31.34 |
| 2026-07-31 12:00 |
13:24:09.51 |
-01:17:47.8 |
HIP 65545 |
31.12 |
| 2026-08-01 00:00 |
13:24:10.78 |
-01:18:10.7 |
HIP 65545 |
30.89 |
| 2026-08-01 12:00 |
13:24:12.11 |
-01:18:34.0 |
HIP 65545 |
30.65 |
| 2026-08-02 00:00 |
13:24:13.51 |
-01:18:57.6 |
HIP 65545 |
30.40 |
| 2026-08-02 12:00 |
13:24:14.96 |
-01:19:21.5 |
HIP 65545 |
30.15 |
| 2026-08-03 00:00 |
13:24:16.48 |
-01:19:45.7 |
HIP 65545 |
29.89 |
| 2026-08-03 12:00 |
13:24:18.05 |
-01:20:10.2 |
HIP 65545 |
29.63 |
| 2026-08-04 00:00 |
13:24:19.69 |
-01:20:35.0 |
HIP 65545 |
29.36 |
| 2026-08-04 12:00 |
13:24:21.39 |
-01:21:00.1 |
HIP 65545 |
29.09 |
| 2026-08-05 00:00 |
13:24:23.15 |
-01:21:25.5 |
HIP 65545 |
28.82 |
| 2026-08-05 12:00 |
13:24:24.97 |
-01:21:51.2 |
HIP 65545 |
28.55 |
| 2026-08-06 00:00 |
13:24:26.85 |
-01:22:17.2 |
HIP 65545 |
28.27 |
| 2026-08-06 12:00 |
13:24:28.78 |
-01:22:43.5 |
HIP 65545 |
27.99 |
| 2026-08-07 00:00 |
13:24:30.78 |
-01:23:10.0 |
HIP 65545 |
27.72 |
| 2026-08-07 12:00 |
13:24:32.84 |
-01:23:36.9 |
HIP 65545 |
27.45 |
| 2026-08-08 00:00 |
13:24:34.96 |
-01:24:04.0 |
HIP 65545 |
27.18 |
| 2026-08-08 12:00 |
13:24:37.13 |
-01:24:31.5 |
HIP 65545 |
26.92 |
| 2026-08-09 00:00 |
13:24:39.37 |
-01:24:59.2 |
HIP 65545 |
26.66 |
| 2026-08-09 12:00 |
13:24:41.66 |
-01:25:27.2 |
HIP 65545 |
26.41 |
| 2026-08-10 00:00 |
13:24:44.01 |
-01:25:55.4 |
HIP 65545 |
26.16 |
| 2026-08-10 12:00 |
13:24:46.42 |
-01:26:24.0 |
HIP 65545 |
25.93 |
| 2026-08-11 00:00 |
13:24:48.88 |
-01:26:52.8 |
HIP 65545 |
25.71 |
| 2026-08-11 12:00 |
13:24:51.41 |
-01:27:21.9 |
HIP 65545 |
25.51 |
| 2026-08-12 00:00 |
13:24:53.99 |
-01:27:51.2 |
HIP 65545 |
25.32 |
| 2026-08-12 12:00 |
13:24:56.62 |
-01:28:20.8 |
HIP 65545 |
25.14 |
| 2026-08-13 00:00 |
13:24:59.32 |
-01:28:50.7 |
HIP 65545 |
24.99 |
| 2026-08-13 12:00 |
13:25:02.07 |
-01:29:20.8 |
HIP 65545 |
24.85 |
| 2026-08-14 00:00 |
13:25:04.87 |
-01:29:51.1 |
HIP 65545 |
24.74 |
| 2026-08-14 12:00 |
13:25:07.73 |
-01:30:21.8 |
HIP 65545 |
24.65 |
| 2026-08-15 00:00 |
13:25:10.65 |
-01:30:52.6 |
HIP 65545 |
24.59 |
| 2026-08-15 12:00 |
13:25:13.62 |
-01:31:23.7 |
HIP 65545 |
24.56 |
| 2026-08-16 00:00 |
13:25:16.64 |
-01:31:55.1 |
HIP 65545 |
24.55 |
| 2026-08-16 12:00 |
13:25:19.72 |
-01:32:26.7 |
HIP 65545 |
24.58 |
| 2026-08-17 00:00 |
13:25:22.85 |
-01:32:58.5 |
HIP 65545 |
24.63 |
| 2026-08-17 12:00 |
13:25:26.03 |
-01:33:30.5 |
HIP 65545 |
24.72 |
| 2026-08-18 00:00 |
13:25:29.27 |
-01:34:02.8 |
HIP 65545 |
24.85 |
| 2026-08-18 12:00 |
13:25:32.56 |
-01:34:35.3 |
HIP 65545 |
25.01 |
| 2026-08-19 00:00 |
13:25:35.90 |
-01:35:08.1 |
HIP 65545 |
25.21 |