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
$$
M_a = (10.540 + 3.608\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.540 |
| n |
3.608 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-07-29 00:00 |
08:56:36.87 |
+04:02:13.3 |
HIP 43902 |
11.97 |
| 2026-07-29 12:00 |
08:56:57.17 |
+04:00:53.6 |
HIP 43902 |
14.22 |
| 2026-07-30 00:00 |
08:57:17.48 |
+03:59:33.3 |
HIP 43902 |
17.78 |
| 2026-07-30 12:00 |
08:57:37.80 |
+03:58:12.5 |
HIP 43902 |
22.03 |
| 2026-07-31 00:00 |
08:57:58.14 |
+03:56:51.1 |
HIP 44105 |
23.21 |
| 2026-07-31 12:00 |
08:58:18.49 |
+03:55:29.2 |
HIP 44105 |
19.07 |
| 2026-08-01 00:00 |
08:58:38.85 |
+03:54:06.8 |
HIP 44105 |
15.61 |
| 2026-08-01 12:00 |
08:58:59.23 |
+03:52:43.8 |
HIP 44105 |
13.36 |
| 2026-08-02 00:00 |
08:59:19.61 |
+03:51:20.2 |
HIP 44105 |
13.00 |
| 2026-08-02 12:00 |
08:59:40.01 |
+03:49:56.1 |
HIP 44105 |
14.65 |
| 2026-08-03 00:00 |
09:00:00.42 |
+03:48:31.5 |
HIP 44105 |
17.78 |
| 2026-08-03 12:00 |
09:00:20.85 |
+03:47:06.3 |
HIP 44287 |
14.90 |
| 2026-08-04 00:00 |
09:00:41.28 |
+03:45:40.6 |
HIP 44287 |
12.19 |
| 2026-08-04 12:00 |
09:01:01.72 |
+03:44:14.4 |
HIP 44287 |
11.46 |
| 2026-08-05 00:00 |
09:01:22.17 |
+03:42:47.6 |
HIP 44287 |
13.05 |
| 2026-08-05 12:00 |
09:01:42.62 |
+03:41:20.3 |
HIP 44287 |
16.31 |
| 2026-08-06 00:00 |
09:02:03.09 |
+03:39:52.5 |
HIP 44287 |
20.45 |
| 2026-08-06 12:00 |
09:02:23.56 |
+03:38:24.1 |
HIP 44363 |
22.11 |
| 2026-08-07 00:00 |
09:02:44.04 |
+03:36:55.3 |
HIP 44363 |
22.38 |
| 2026-08-07 12:00 |
09:03:04.53 |
+03:35:25.8 |
HIP 44363 |
23.87 |
| 2026-08-08 00:00 |
09:03:25.02 |
+03:33:55.9 |
HIP 44552 |
18.70 |
| 2026-08-08 12:00 |
09:03:45.52 |
+03:32:25.5 |
HIP 44552 |
13.52 |
| 2026-08-09 00:00 |
09:04:06.02 |
+03:30:54.5 |
HIP 44552 |
8.55 |
| 2026-08-09 12:00 |
09:04:26.52 |
+03:29:23.0 |
HIP 44552 |
4.51 |
| 2026-08-10 00:00 |
09:04:47.03 |
+03:27:51.0 |
HIP 44552 |
4.96 |
| 2026-08-10 12:00 |
09:05:07.53 |
+03:26:18.5 |
HIP 44552 |
9.28 |
| 2026-08-11 00:00 |
09:05:28.05 |
+03:24:45.5 |
HIP 44552 |
14.31 |
| 2026-08-11 12:00 |
09:05:48.56 |
+03:23:12.0 |
HIP 44552 |
19.52 |
| 2026-08-12 00:00 |
09:06:09.07 |
+03:21:38.0 |
HIP 44552 |
24.79 |
| 2026-08-12 12:00 |
09:06:29.58 |
+03:20:03.5 |
HIP 44552 |
30.09 |
| 2026-08-13 00:00 |
09:06:50.09 |
+03:18:28.5 |
HIP 44711 |
29.52 |
| 2026-08-13 12:00 |
09:07:10.60 |
+03:16:53.0 |
HIP 44711 |
28.93 |
| 2026-08-14 00:00 |
09:07:31.11 |
+03:15:17.0 |
HIP 44711 |
29.32 |
| 2026-08-14 12:00 |
09:07:51.61 |
+03:13:40.6 |
HIP 44958 |
30.20 |
| 2026-08-15 00:00 |
09:08:12.11 |
+03:12:03.6 |
HIP 44958 |
25.12 |
| 2026-08-15 12:00 |
09:08:32.60 |
+03:10:26.2 |
HIP 44958 |
20.19 |
| 2026-08-16 00:00 |
09:08:53.09 |
+03:08:48.3 |
HIP 44958 |
15.55 |
| 2026-08-16 12:00 |
09:09:13.58 |
+03:07:09.9 |
HIP 44958 |
11.54 |
| 2026-08-17 00:00 |
09:09:34.05 |
+03:05:31.1 |
HIP 44958 |
9.07 |
| 2026-08-17 12:00 |
09:09:54.53 |
+03:03:51.7 |
HIP 44958 |
9.42 |
| 2026-08-18 00:00 |
09:10:14.99 |
+03:02:12.0 |
HIP 44958 |
12.36 |
| 2026-08-18 12:00 |
09:10:35.44 |
+03:00:31.7 |
HIP 44958 |
16.57 |
| 2026-08-19 00:00 |
09:10:55.89 |
+02:58:51.0 |
HIP 45159 |
15.76 |