メタデータ
| 項目 |
値 |
| Designation |
P/2016 A7 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-02-25T20:41:32.879040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:21Z |
| Obs used |
46 |
| NEO |
- |
| M1 |
7.800 |
| K1 |
33.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-03-18.0000000 |
| e |
0.56662578 |
| q (au) |
2.176649 |
| a (au) |
5.022563 |
| i (deg) |
16.637470 |
| Ω (om, deg) |
221.466093 |
| ω (w, deg) |
352.469583 |
| M (ma, deg) |
1.850871 |
等級
散乱 + 全体線形
$$
M_a = (13.342 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.342 |
| 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 |
09:41:43.24 |
+00:33:46.6 |
HIP 47666 |
22.26 |
| 2026-09-20 12:00 |
09:42:26.93 |
+00:29:31.5 |
HIP 47666 |
11.15 |
| 2026-09-21 00:00 |
09:43:10.61 |
+00:25:15.7 |
HIP 47666 |
5.30 |
| 2026-09-21 12:00 |
09:43:54.30 |
+00:20:59.0 |
HIP 47712 |
9.17 |
| 2026-09-22 00:00 |
09:44:37.98 |
+00:16:41.4 |
HIP 47712 |
19.52 |
| 2026-09-22 12:00 |
09:45:21.66 |
+00:12:23.0 |
HIP 47948 |
17.97 |
| 2026-09-23 00:00 |
09:46:05.34 |
+00:08:03.9 |
HIP 47948 |
8.37 |
| 2026-09-23 12:00 |
09:46:49.01 |
+00:03:43.8 |
HIP 47948 |
9.63 |
| 2026-09-24 00:00 |
09:47:32.68 |
-00:00:37.0 |
HIP 47948 |
19.78 |
| 2026-09-24 12:00 |
09:48:16.35 |
-00:04:58.6 |
HIP 48252 |
30.26 |
| 2026-09-25 00:00 |
09:49:00.01 |
-00:09:21.1 |
HIP 48252 |
18.57 |
| 2026-09-25 12:00 |
09:49:43.68 |
-00:13:44.3 |
HIP 48252 |
7.14 |
| 2026-09-26 00:00 |
09:50:27.33 |
-00:18:08.4 |
HIP 48252 |
5.82 |
| 2026-09-26 12:00 |
09:51:10.98 |
-00:22:33.3 |
HIP 48252 |
17.15 |
| 2026-09-27 00:00 |
09:51:54.63 |
-00:26:58.9 |
HIP 48252 |
28.84 |
| 2026-09-27 12:00 |
09:52:38.28 |
-00:31:25.4 |
HIP 48590 |
29.85 |
| 2026-09-28 00:00 |
09:53:21.92 |
-00:35:52.6 |
HIP 48590 |
21.47 |
| 2026-09-28 12:00 |
09:54:05.55 |
-00:40:20.6 |
HIP 48590 |
17.58 |
| 2026-09-29 00:00 |
09:54:49.18 |
-00:44:49.4 |
HIP 48590 |
20.86 |
| 2026-09-29 12:00 |
09:55:32.81 |
-00:49:19.0 |
HIP 48671 |
18.26 |
| 2026-09-30 00:00 |
09:56:16.42 |
-00:53:49.4 |
HIP 48671 |
17.19 |
| 2026-09-30 12:00 |
09:57:00.04 |
-00:58:20.5 |
HIP 48671 |
23.14 |
| 2026-10-01 00:00 |
09:57:43.64 |
-01:02:52.4 |
HIP 48671 |
32.46 |
| 2026-10-01 12:00 |
09:58:27.24 |
-01:07:25.1 |
HIP 49037 |
27.87 |
| 2026-10-02 00:00 |
09:59:10.84 |
-01:11:58.5 |
HIP 49037 |
18.75 |
| 2026-10-02 12:00 |
09:59:54.42 |
-01:16:32.7 |
HIP 49037 |
14.33 |
| 2026-10-03 00:00 |
10:00:38.00 |
-01:21:07.7 |
HIP 49037 |
18.41 |
| 2026-10-03 12:00 |
10:01:21.57 |
-01:25:43.3 |
HIP 49125 |
24.88 |
| 2026-10-04 00:00 |
10:02:05.14 |
-01:30:19.8 |
HIP 49221 |
28.49 |
| 2026-10-04 12:00 |
10:02:48.69 |
-01:34:56.9 |
HIP 49335 |
22.94 |
| 2026-10-05 00:00 |
10:03:32.23 |
-01:39:34.8 |
HIP 49335 |
11.26 |
| 2026-10-05 12:00 |
10:04:15.77 |
-01:44:13.4 |
HIP 49335 |
2.67 |
| 2026-10-06 00:00 |
10:04:59.29 |
-01:48:52.8 |
HIP 49335 |
12.94 |
| 2026-10-06 12:00 |
10:05:42.80 |
-01:53:32.8 |
HIP 49540 |
20.39 |
| 2026-10-07 00:00 |
10:06:26.30 |
-01:58:13.6 |
HIP 49540 |
16.30 |
| 2026-10-07 12:00 |
10:07:09.79 |
-02:02:55.0 |
HIP 49540 |
19.90 |
| 2026-10-08 00:00 |
10:07:53.27 |
-02:07:37.2 |
HIP 49528 |
23.49 |
| 2026-10-08 12:00 |
10:08:36.73 |
-02:12:20.0 |
HIP 49643 |
21.48 |
| 2026-10-09 00:00 |
10:09:20.18 |
-02:17:03.5 |
HIP 49643 |
25.25 |
| 2026-10-09 12:00 |
10:10:03.62 |
-02:21:47.7 |
HIP 49871 |
14.74 |
| 2026-10-10 00:00 |
10:10:47.04 |
-02:26:32.6 |
HIP 49871 |
3.93 |
| 2026-10-10 12:00 |
10:11:30.45 |
-02:31:18.1 |
HIP 49871 |
9.69 |
| 2026-10-11 00:00 |
10:12:13.84 |
-02:36:04.2 |
HIP 49969 |
5.46 |