メタデータ
| 項目 |
値 |
| Designation |
P/2012 F2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-04-10T00:22:20.953920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:05Z |
| Obs used |
100 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
8.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-12-31.0000000 |
| e |
0.54223975 |
| q (au) |
2.897068 |
| a (au) |
6.328788 |
| i (deg) |
14.724691 |
| Ω (om, deg) |
227.135164 |
| ω (w, deg) |
33.192840 |
| M (ma, deg) |
353.808575 |
等級
散乱 + 全体線形
$$
M_a = (10.654 + 3.510\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.654 |
| n |
3.510 |
| gf |
1.000 |
| gb |
-0.553 |
| 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) |
| 2026-05-12 00:00 |
08:13:32.85 |
+05:19:51.3 |
HIP 40247 |
20.34 |
| 2026-05-12 12:00 |
08:13:43.10 |
+05:20:13.8 |
HIP 40247 |
21.45 |
| 2026-05-13 00:00 |
08:13:53.47 |
+05:20:35.7 |
HIP 40247 |
22.81 |
| 2026-05-13 12:00 |
08:14:03.95 |
+05:20:56.9 |
HIP 40425 |
21.68 |
| 2026-05-14 00:00 |
08:14:14.55 |
+05:21:17.4 |
HIP 40425 |
19.35 |
| 2026-05-14 12:00 |
08:14:25.26 |
+05:21:37.3 |
HIP 40425 |
17.11 |
| 2026-05-15 00:00 |
08:14:36.09 |
+05:21:56.5 |
HIP 40425 |
15.00 |
| 2026-05-15 12:00 |
08:14:47.03 |
+05:22:15.0 |
HIP 40425 |
13.11 |
| 2026-05-16 00:00 |
08:14:58.09 |
+05:22:32.8 |
HIP 40425 |
11.57 |
| 2026-05-16 12:00 |
08:15:09.26 |
+05:22:50.0 |
HIP 40425 |
10.55 |
| 2026-05-17 00:00 |
08:15:20.53 |
+05:23:06.4 |
HIP 40425 |
10.23 |
| 2026-05-17 12:00 |
08:15:31.92 |
+05:23:22.2 |
HIP 40425 |
10.69 |
| 2026-05-18 00:00 |
08:15:43.42 |
+05:23:37.3 |
HIP 40425 |
11.86 |
| 2026-05-18 12:00 |
08:15:55.03 |
+05:23:51.7 |
HIP 40425 |
13.58 |
| 2026-05-19 00:00 |
08:16:06.74 |
+05:24:05.4 |
HIP 40425 |
15.68 |
| 2026-05-19 12:00 |
08:16:18.57 |
+05:24:18.4 |
HIP 40425 |
18.04 |
| 2026-05-20 00:00 |
08:16:30.50 |
+05:24:30.8 |
HIP 40425 |
20.58 |
| 2026-05-20 12:00 |
08:16:42.54 |
+05:24:42.4 |
HIP 40425 |
23.25 |
| 2026-05-21 00:00 |
08:16:54.68 |
+05:24:53.4 |
HIP 40425 |
26.03 |
| 2026-05-21 12:00 |
08:17:06.93 |
+05:25:03.7 |
HIP 40704 |
25.51 |
| 2026-05-22 00:00 |
08:17:19.28 |
+05:25:13.2 |
HIP 40704 |
23.09 |
| 2026-05-22 12:00 |
08:17:31.73 |
+05:25:22.1 |
HIP 40704 |
20.83 |
| 2026-05-23 00:00 |
08:17:44.28 |
+05:25:30.3 |
HIP 40704 |
18.78 |
| 2026-05-23 12:00 |
08:17:56.94 |
+05:25:37.8 |
HIP 40704 |
17.04 |
| 2026-05-24 00:00 |
08:18:09.70 |
+05:25:44.7 |
HIP 40704 |
15.73 |
| 2026-05-24 12:00 |
08:18:22.56 |
+05:25:50.8 |
HIP 40704 |
14.97 |
| 2026-05-25 00:00 |
08:18:35.51 |
+05:25:56.2 |
HIP 40704 |
14.86 |
| 2026-05-25 12:00 |
08:18:48.57 |
+05:26:01.0 |
HIP 40704 |
15.44 |
| 2026-05-26 00:00 |
08:19:01.72 |
+05:26:05.0 |
HIP 40704 |
16.65 |
| 2026-05-26 12:00 |
08:19:14.97 |
+05:26:08.4 |
HIP 40704 |
18.37 |
| 2026-05-27 00:00 |
08:19:28.32 |
+05:26:11.1 |
HIP 40704 |
20.49 |
| 2026-05-27 12:00 |
08:19:41.76 |
+05:26:13.1 |
HIP 40892 |
20.99 |
| 2026-05-28 00:00 |
08:19:55.30 |
+05:26:14.4 |
HIP 40892 |
18.78 |
| 2026-05-28 12:00 |
08:20:08.93 |
+05:26:15.0 |
HIP 40892 |
16.94 |
| 2026-05-29 00:00 |
08:20:22.65 |
+05:26:14.9 |
HIP 40892 |
15.60 |
| 2026-05-29 12:00 |
08:20:36.47 |
+05:26:14.2 |
HIP 40892 |
14.92 |
| 2026-05-30 00:00 |
08:20:50.38 |
+05:26:12.7 |
HIP 40892 |
15.02 |
| 2026-05-30 12:00 |
08:21:04.38 |
+05:26:10.6 |
HIP 40892 |
15.88 |
| 2026-05-31 00:00 |
08:21:18.47 |
+05:26:07.7 |
HIP 40892 |
17.42 |
| 2026-05-31 12:00 |
08:21:32.65 |
+05:26:04.2 |
HIP 40892 |
19.48 |
| 2026-06-01 00:00 |
08:21:46.93 |
+05:26:00.0 |
HIP 40892 |
21.93 |
| 2026-06-01 12:00 |
08:22:01.29 |
+05:25:55.1 |
HIP 40892 |
24.65 |
| 2026-06-02 00:00 |
08:22:15.73 |
+05:25:49.5 |
HIP 41032 |
25.02 |