P/2025 A2 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
P/2025 A2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-10-05T15:17:25.509120Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T14:45:09Z |
| Obs used |
66 |
| NEO |
- |
| M1 |
16.100 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-01-07T09:59:40.761600Z |
| Discovery magnitude (MPC) |
21.00 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2025-01-22.0000000 |
| e |
0.32241041 |
| q (au) |
3.446251 |
| a (au) |
5.086044 |
| i (deg) |
20.732644 |
| Ω (om, deg) |
189.324202 |
| ω (w, deg) |
278.033834 |
| M (ma, deg) |
9.311389 |
等級
散乱 + 全体線形
$$
M_a = (15.115 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.115 |
| n |
2.000 |
| gf |
0.997 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.998 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
12:47:49.96 |
-08:23:06.8 |
HIP 62371 |
37.32 |
| 2026-02-03 12:00 |
12:47:49.87 |
-08:21:52.6 |
HIP 62371 |
36.15 |
| 2026-02-04 00:00 |
12:47:49.56 |
-08:20:36.6 |
HIP 62371 |
34.94 |
| 2026-02-04 12:00 |
12:47:49.02 |
-08:19:18.9 |
HIP 62371 |
33.68 |
| 2026-02-05 00:00 |
12:47:48.26 |
-08:17:59.4 |
HIP 62371 |
32.38 |
| 2026-02-05 12:00 |
12:47:47.26 |
-08:16:38.1 |
HIP 62371 |
31.04 |
| 2026-02-06 00:00 |
12:47:46.04 |
-08:15:15.0 |
HIP 62371 |
29.64 |
| 2026-02-06 12:00 |
12:47:44.60 |
-08:13:50.1 |
HIP 62371 |
28.20 |
| 2026-02-07 00:00 |
12:47:42.93 |
-08:12:23.5 |
HIP 62371 |
26.72 |
| 2026-02-07 12:00 |
12:47:41.03 |
-08:10:55.1 |
HIP 62371 |
25.18 |
| 2026-02-08 00:00 |
12:47:38.91 |
-08:09:25.0 |
HIP 62371 |
23.59 |
| 2026-02-08 12:00 |
12:47:36.57 |
-08:07:53.0 |
HIP 62371 |
21.96 |
| 2026-02-09 00:00 |
12:47:34.00 |
-08:06:19.3 |
HIP 62371 |
20.28 |
| 2026-02-09 12:00 |
12:47:31.20 |
-08:04:43.9 |
HIP 62371 |
18.54 |
| 2026-02-10 00:00 |
12:47:28.19 |
-08:03:06.7 |
HIP 62371 |
16.76 |
| 2026-02-10 12:00 |
12:47:24.95 |
-08:01:27.7 |
HIP 62371 |
14.92 |
| 2026-02-11 00:00 |
12:47:21.49 |
-07:59:46.9 |
HIP 62371 |
13.04 |
| 2026-02-11 12:00 |
12:47:17.81 |
-07:58:04.4 |
HIP 62371 |
11.11 |
| 2026-02-12 00:00 |
12:47:13.91 |
-07:56:20.2 |
HIP 62371 |
9.13 |
| 2026-02-12 12:00 |
12:47:09.79 |
-07:54:34.2 |
HIP 62371 |
7.10 |
| 2026-02-13 00:00 |
12:47:05.45 |
-07:52:46.5 |
HIP 62371 |
5.05 |
| 2026-02-13 12:00 |
12:47:00.89 |
-07:50:57.0 |
HIP 62371 |
3.00 |
| 2026-02-14 00:00 |
12:46:56.12 |
-07:49:05.8 |
HIP 62371 |
1.33 |
| 2026-02-14 12:00 |
12:46:51.13 |
-07:47:12.9 |
HIP 62371 |
2.11 |
| 2026-02-15 00:00 |
12:46:45.92 |
-07:45:18.2 |
HIP 62371 |
4.22 |
| 2026-02-15 12:00 |
12:46:40.51 |
-07:43:21.9 |
HIP 62371 |
6.52 |
| 2026-02-16 00:00 |
12:46:34.88 |
-07:41:23.8 |
HIP 62371 |
8.90 |
| 2026-02-16 12:00 |
12:46:29.03 |
-07:39:24.1 |
HIP 62371 |
11.36 |
| 2026-02-17 00:00 |
12:46:22.98 |
-07:37:22.7 |
HIP 62371 |
13.87 |
| 2026-02-17 12:00 |
12:46:16.72 |
-07:35:19.5 |
HIP 62371 |
16.44 |
| 2026-02-18 00:00 |
12:46:10.26 |
-07:33:14.8 |
HIP 62371 |
19.06 |
| 2026-02-18 12:00 |
12:46:03.58 |
-07:31:08.3 |
HIP 62371 |
21.74 |
| 2026-02-19 00:00 |
12:45:56.71 |
-07:29:00.2 |
HIP 62153 |
24.19 |
| 2026-02-19 12:00 |
12:45:49.63 |
-07:26:50.5 |
HIP 62153 |
22.54 |
| 2026-02-20 00:00 |
12:45:42.35 |
-07:24:39.1 |
HIP 62153 |
21.09 |
| 2026-02-20 12:00 |
12:45:34.87 |
-07:22:26.2 |
HIP 62153 |
19.90 |
| 2026-02-21 00:00 |
12:45:27.20 |
-07:20:11.6 |
HIP 62153 |
19.05 |
| 2026-02-21 12:00 |
12:45:19.33 |
-07:17:55.4 |
HIP 62153 |
18.60 |
| 2026-02-22 00:00 |
12:45:11.26 |
-07:15:37.7 |
HIP 62153 |
18.62 |
| 2026-02-22 12:00 |
12:45:03.00 |
-07:13:18.4 |
HIP 62153 |
19.12 |
| 2026-02-23 00:00 |
12:44:54.56 |
-07:10:57.5 |
HIP 62153 |
20.09 |
| 2026-02-23 12:00 |
12:44:45.93 |
-07:08:35.1 |
HIP 62153 |
21.49 |
| 2026-02-24 00:00 |
12:44:37.11 |
-07:06:11.2 |
HIP 62153 |
23.27 |