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) |
| 2026-03-26 00:00 |
12:31:39.98 |
-04:07:31.2 |
HIP 61054 |
12.97 |
| 2026-03-26 12:00 |
12:31:24.75 |
-04:04:12.6 |
HIP 61054 |
8.60 |
| 2026-03-27 00:00 |
12:31:09.51 |
-04:00:54.0 |
HIP 61054 |
5.51 |
| 2026-03-27 12:00 |
12:30:54.27 |
-03:57:35.3 |
HIP 61054 |
6.14 |
| 2026-03-28 00:00 |
12:30:39.04 |
-03:54:16.7 |
HIP 61054 |
9.79 |
| 2026-03-28 12:00 |
12:30:23.81 |
-03:50:58.0 |
HIP 61054 |
14.31 |
| 2026-03-29 00:00 |
12:30:08.59 |
-03:47:39.4 |
HIP 61054 |
19.08 |
| 2026-03-29 12:00 |
12:29:53.38 |
-03:44:20.8 |
HIP 61054 |
23.97 |
| 2026-03-30 00:00 |
12:29:38.18 |
-03:41:02.4 |
HIP 60956 |
21.18 |
| 2026-03-30 12:00 |
12:29:23.01 |
-03:37:44.1 |
HIP 60956 |
18.52 |
| 2026-03-31 00:00 |
12:29:07.85 |
-03:34:25.9 |
HIP 60956 |
16.97 |
| 2026-03-31 12:00 |
12:28:52.72 |
-03:31:07.9 |
HIP 60956 |
16.83 |
| 2026-04-01 00:00 |
12:28:37.62 |
-03:27:50.1 |
HIP 60956 |
18.13 |
| 2026-04-01 12:00 |
12:28:22.55 |
-03:24:32.6 |
HIP 60757 |
19.45 |
| 2026-04-02 00:00 |
12:28:07.51 |
-03:21:15.3 |
HIP 60757 |
14.83 |
| 2026-04-02 12:00 |
12:27:52.51 |
-03:17:58.3 |
HIP 60757 |
10.56 |
| 2026-04-03 00:00 |
12:27:37.55 |
-03:14:41.6 |
HIP 60757 |
7.27 |
| 2026-04-03 12:00 |
12:27:22.63 |
-03:11:25.3 |
HIP 60757 |
6.59 |
| 2026-04-04 00:00 |
12:27:07.76 |
-03:08:09.3 |
HIP 60757 |
9.12 |
| 2026-04-04 12:00 |
12:26:52.94 |
-03:04:53.7 |
HIP 60757 |
13.09 |
| 2026-04-05 00:00 |
12:26:38.17 |
-03:01:38.6 |
HIP 60757 |
17.55 |
| 2026-04-05 12:00 |
12:26:23.46 |
-02:58:23.9 |
HIP 60757 |
22.18 |
| 2026-04-06 00:00 |
12:26:08.81 |
-02:55:09.7 |
HIP 60757 |
26.90 |
| 2026-04-06 12:00 |
12:25:54.22 |
-02:51:56.0 |
HIP 60757 |
31.65 |
| 2026-04-07 00:00 |
12:25:39.69 |
-02:48:42.8 |
HIP 60572 |
30.33 |
| 2026-04-07 12:00 |
12:25:25.23 |
-02:45:30.2 |
HIP 60572 |
26.17 |
| 2026-04-08 00:00 |
12:25:10.85 |
-02:42:18.2 |
HIP 60572 |
22.28 |
| 2026-04-08 12:00 |
12:24:56.53 |
-02:39:06.7 |
HIP 60572 |
18.84 |
| 2026-04-09 00:00 |
12:24:42.30 |
-02:35:55.9 |
HIP 60572 |
16.12 |
| 2026-04-09 12:00 |
12:24:28.14 |
-02:32:45.8 |
HIP 60572 |
14.49 |
| 2026-04-10 00:00 |
12:24:14.07 |
-02:29:36.4 |
HIP 60572 |
14.31 |
| 2026-04-10 12:00 |
12:24:00.08 |
-02:26:27.7 |
HIP 60572 |
15.62 |
| 2026-04-11 00:00 |
12:23:46.18 |
-02:23:19.7 |
HIP 60572 |
18.07 |
| 2026-04-11 12:00 |
12:23:32.37 |
-02:20:12.5 |
HIP 60572 |
21.26 |
| 2026-04-12 00:00 |
12:23:18.66 |
-02:17:06.0 |
HIP 60410 |
22.31 |
| 2026-04-12 12:00 |
12:23:05.05 |
-02:14:00.4 |
HIP 60410 |
19.20 |
| 2026-04-13 00:00 |
12:22:51.53 |
-02:10:55.7 |
HIP 60410 |
16.80 |
| 2026-04-13 12:00 |
12:22:38.12 |
-02:07:51.8 |
HIP 60410 |
15.41 |
| 2026-04-14 00:00 |
12:22:24.81 |
-02:04:48.7 |
HIP 60410 |
15.28 |
| 2026-04-14 12:00 |
12:22:11.62 |
-02:01:46.6 |
HIP 60410 |
16.43 |
| 2026-04-15 00:00 |
12:21:58.53 |
-01:58:45.5 |
HIP 60410 |
18.58 |
| 2026-04-15 12:00 |
12:21:45.56 |
-01:55:45.2 |
HIP 60410 |
21.43 |
| 2026-04-16 00:00 |
12:21:32.70 |
-01:52:46.0 |
HIP 60410 |
24.72 |