P/2016 A7 (PANSTARRS)
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 |
-0.998 |
| 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) |
| 2026-02-03 00:00 |
06:18:13.00 |
+05:25:52.0 |
HIP 29860 |
24.39 |
| 2026-02-03 12:00 |
06:17:59.15 |
+05:26:52.9 |
HIP 29860 |
23.47 |
| 2026-02-04 00:00 |
06:17:45.51 |
+05:27:54.7 |
HIP 29860 |
23.11 |
| 2026-02-04 12:00 |
06:17:32.08 |
+05:28:57.3 |
HIP 29860 |
23.31 |
| 2026-02-05 00:00 |
06:17:18.87 |
+05:30:00.9 |
HIP 29860 |
24.04 |
| 2026-02-05 12:00 |
06:17:05.88 |
+05:31:05.2 |
HIP 29837 |
24.89 |
| 2026-02-06 00:00 |
06:16:53.11 |
+05:32:10.4 |
HIP 29837 |
23.72 |
| 2026-02-06 12:00 |
06:16:40.56 |
+05:33:16.4 |
HIP 29837 |
22.96 |
| 2026-02-07 00:00 |
06:16:28.23 |
+05:34:23.2 |
HIP 29837 |
22.63 |
| 2026-02-07 12:00 |
06:16:16.13 |
+05:35:30.8 |
HIP 29837 |
22.74 |
| 2026-02-08 00:00 |
06:16:04.26 |
+05:36:39.2 |
HIP 29837 |
23.24 |
| 2026-02-08 12:00 |
06:15:52.62 |
+05:37:48.3 |
HIP 29837 |
24.11 |
| 2026-02-09 00:00 |
06:15:41.21 |
+05:38:58.2 |
HIP 29728 |
25.00 |
| 2026-02-09 12:00 |
06:15:30.03 |
+05:40:08.8 |
HIP 29728 |
23.96 |
| 2026-02-10 00:00 |
06:15:19.09 |
+05:41:20.2 |
HIP 29728 |
23.24 |
| 2026-02-10 12:00 |
06:15:08.39 |
+05:42:32.2 |
HIP 29728 |
22.85 |
| 2026-02-11 00:00 |
06:14:57.92 |
+05:43:45.0 |
HIP 29728 |
22.79 |
| 2026-02-11 12:00 |
06:14:47.69 |
+05:44:58.5 |
HIP 29728 |
23.05 |
| 2026-02-12 00:00 |
06:14:37.71 |
+05:46:12.6 |
HIP 29728 |
23.60 |
| 2026-02-12 12:00 |
06:14:27.97 |
+05:47:27.4 |
HIP 29728 |
24.40 |
| 2026-02-13 00:00 |
06:14:18.48 |
+05:48:42.8 |
HIP 29509 |
23.14 |
| 2026-02-13 12:00 |
06:14:09.23 |
+05:49:58.9 |
HIP 29509 |
20.52 |
| 2026-02-14 00:00 |
06:14:00.23 |
+05:51:15.5 |
HIP 29509 |
17.94 |
| 2026-02-14 12:00 |
06:13:51.48 |
+05:52:32.8 |
HIP 29509 |
15.42 |
| 2026-02-15 00:00 |
06:13:42.98 |
+05:53:50.7 |
HIP 29509 |
12.94 |
| 2026-02-15 12:00 |
06:13:34.73 |
+05:55:09.1 |
HIP 29509 |
10.51 |
| 2026-02-16 00:00 |
06:13:26.74 |
+05:56:28.1 |
HIP 29509 |
8.12 |
| 2026-02-16 12:00 |
06:13:19.00 |
+05:57:47.7 |
HIP 29509 |
5.79 |
| 2026-02-17 00:00 |
06:13:11.52 |
+05:59:07.8 |
HIP 29509 |
3.50 |
| 2026-02-17 12:00 |
06:13:04.29 |
+06:00:28.4 |
HIP 29509 |
1.28 |
| 2026-02-18 00:00 |
06:12:57.33 |
+06:01:49.5 |
HIP 29509 |
1.01 |
| 2026-02-18 12:00 |
06:12:50.62 |
+06:03:11.1 |
HIP 29509 |
3.13 |
| 2026-02-19 00:00 |
06:12:44.17 |
+06:04:33.1 |
HIP 29509 |
5.24 |
| 2026-02-19 12:00 |
06:12:37.98 |
+06:05:55.7 |
HIP 29509 |
7.30 |
| 2026-02-20 00:00 |
06:12:32.05 |
+06:07:18.6 |
HIP 29509 |
9.32 |
| 2026-02-20 12:00 |
06:12:26.39 |
+06:08:42.0 |
HIP 29509 |
11.30 |
| 2026-02-21 00:00 |
06:12:20.99 |
+06:10:05.8 |
HIP 29509 |
13.23 |
| 2026-02-21 12:00 |
06:12:15.85 |
+06:11:30.0 |
HIP 29381 |
14.05 |
| 2026-02-22 00:00 |
06:12:10.97 |
+06:12:54.6 |
HIP 29381 |
12.22 |
| 2026-02-22 12:00 |
06:12:06.36 |
+06:14:19.5 |
HIP 29381 |
10.44 |
| 2026-02-23 00:00 |
06:12:02.02 |
+06:15:44.8 |
HIP 29381 |
8.73 |
| 2026-02-23 12:00 |
06:11:57.94 |
+06:17:10.5 |
HIP 29381 |
7.11 |
| 2026-02-24 00:00 |
06:11:54.13 |
+06:18:36.4 |
HIP 29381 |
5.64 |