P/2015 A3 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
13:59:49.00 |
-04:29:36.5 |
HIP 68221 |
28.31 |
| 2026-02-03 12:00 |
13:59:46.47 |
-04:29:04.3 |
HIP 68221 |
27.58 |
| 2026-02-04 00:00 |
13:59:43.87 |
-04:28:31.7 |
HIP 68221 |
26.83 |
| 2026-02-04 12:00 |
13:59:41.20 |
-04:27:58.6 |
HIP 68221 |
26.07 |
| 2026-02-05 00:00 |
13:59:38.45 |
-04:27:25.2 |
HIP 68221 |
25.30 |
| 2026-02-05 12:00 |
13:59:35.62 |
-04:26:51.4 |
HIP 68221 |
24.51 |
| 2026-02-06 00:00 |
13:59:32.72 |
-04:26:17.1 |
HIP 68221 |
23.72 |
| 2026-02-06 12:00 |
13:59:29.75 |
-04:25:42.5 |
HIP 68221 |
22.91 |
| 2026-02-07 00:00 |
13:59:26.70 |
-04:25:07.5 |
HIP 68221 |
22.10 |
| 2026-02-07 12:00 |
13:59:23.58 |
-04:24:32.1 |
HIP 68221 |
21.28 |
| 2026-02-08 00:00 |
13:59:20.38 |
-04:23:56.3 |
HIP 68221 |
20.45 |
| 2026-02-08 12:00 |
13:59:17.11 |
-04:23:20.2 |
HIP 68221 |
19.62 |
| 2026-02-09 00:00 |
13:59:13.76 |
-04:22:43.6 |
HIP 68221 |
18.79 |
| 2026-02-09 12:00 |
13:59:10.34 |
-04:22:06.7 |
HIP 68221 |
17.96 |
| 2026-02-10 00:00 |
13:59:06.84 |
-04:21:29.3 |
HIP 68221 |
17.14 |
| 2026-02-10 12:00 |
13:59:03.27 |
-04:20:51.6 |
HIP 68221 |
16.33 |
| 2026-02-11 00:00 |
13:58:59.62 |
-04:20:13.6 |
HIP 68221 |
15.54 |
| 2026-02-11 12:00 |
13:58:55.90 |
-04:19:35.1 |
HIP 68221 |
14.78 |
| 2026-02-12 00:00 |
13:58:52.11 |
-04:18:56.3 |
HIP 68221 |
14.04 |
| 2026-02-12 12:00 |
13:58:48.24 |
-04:18:17.1 |
HIP 68221 |
13.35 |
| 2026-02-13 00:00 |
13:58:44.30 |
-04:17:37.5 |
HIP 68221 |
12.71 |
| 2026-02-13 12:00 |
13:58:40.28 |
-04:16:57.6 |
HIP 68221 |
12.15 |
| 2026-02-14 00:00 |
13:58:36.19 |
-04:16:17.3 |
HIP 68221 |
11.67 |
| 2026-02-14 12:00 |
13:58:32.03 |
-04:15:36.6 |
HIP 68221 |
11.29 |
| 2026-02-15 00:00 |
13:58:27.79 |
-04:14:55.6 |
HIP 68221 |
11.03 |
| 2026-02-15 12:00 |
13:58:23.49 |
-04:14:14.2 |
HIP 68221 |
10.90 |
| 2026-02-16 00:00 |
13:58:19.10 |
-04:13:32.5 |
HIP 68221 |
10.92 |
| 2026-02-16 12:00 |
13:58:14.65 |
-04:12:50.4 |
HIP 68221 |
11.09 |
| 2026-02-17 00:00 |
13:58:10.12 |
-04:12:08.0 |
HIP 68221 |
11.41 |
| 2026-02-17 12:00 |
13:58:05.52 |
-04:11:25.2 |
HIP 68221 |
11.88 |
| 2026-02-18 00:00 |
13:58:00.85 |
-04:10:42.0 |
HIP 68221 |
12.48 |
| 2026-02-18 12:00 |
13:57:56.10 |
-04:09:58.6 |
HIP 68221 |
13.20 |
| 2026-02-19 00:00 |
13:57:51.29 |
-04:09:14.8 |
HIP 68221 |
14.03 |
| 2026-02-19 12:00 |
13:57:46.40 |
-04:08:30.6 |
HIP 68221 |
14.96 |
| 2026-02-20 00:00 |
13:57:41.44 |
-04:07:46.1 |
HIP 68221 |
15.97 |
| 2026-02-20 12:00 |
13:57:36.41 |
-04:07:01.3 |
HIP 68221 |
17.05 |
| 2026-02-21 00:00 |
13:57:31.31 |
-04:06:16.2 |
HIP 68221 |
18.20 |
| 2026-02-21 12:00 |
13:57:26.14 |
-04:05:30.7 |
HIP 68221 |
19.40 |
| 2026-02-22 00:00 |
13:57:20.90 |
-04:04:45.0 |
HIP 68221 |
20.65 |
| 2026-02-22 12:00 |
13:57:15.59 |
-04:03:58.9 |
HIP 68221 |
21.95 |
| 2026-02-23 00:00 |
13:57:10.22 |
-04:03:12.5 |
HIP 68221 |
23.30 |
| 2026-02-23 12:00 |
13:57:04.77 |
-04:02:25.8 |
HIP 68221 |
24.67 |
| 2026-02-24 00:00 |
13:56:59.25 |
-04:01:38.7 |
HIP 68221 |
26.09 |