メタデータ
| 項目 |
値 |
| Designation |
P/2025 Y2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-12-07T01:17:08.240640Z |
| Orbit solution date (soln_date, UTC) |
2026-05-28T12:12:23Z |
| Obs used |
274 |
| NEO |
- |
| M1 |
12.200 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-12-27T14:05:50.582400Z |
| Discovery magnitude (MPC) |
20.46 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2026-03-19.0000000 |
| e |
0.24152933 |
| q (au) |
3.046887 |
| a (au) |
4.017146 |
| i (deg) |
16.587421 |
| Ω (om, deg) |
177.477177 |
| ω (w, deg) |
344.703974 |
| M (ma, deg) |
12.479574 |
等級
散乱 + 全体線形
$$
M_a = (17.467 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.467 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.732 |
| k |
0.800 |
| 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
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) |
| 2026-06-01 00:00 |
12:07:16.65 |
+06:27:14.4 |
HIP 59147 |
20.00 |
| 2026-06-01 12:00 |
12:07:28.43 |
+06:26:53.7 |
HIP 59147 |
19.61 |
| 2026-06-02 00:00 |
12:07:40.46 |
+06:26:30.9 |
HIP 59147 |
19.71 |
| 2026-06-02 12:00 |
12:07:52.73 |
+06:26:06.0 |
HIP 59147 |
20.29 |
| 2026-06-03 00:00 |
12:08:05.23 |
+06:25:39.0 |
HIP 59147 |
21.36 |
| 2026-06-03 12:00 |
12:08:17.98 |
+06:25:10.1 |
HIP 59147 |
22.86 |
| 2026-06-04 00:00 |
12:08:30.96 |
+06:24:39.0 |
HIP 59170 |
23.55 |
| 2026-06-04 12:00 |
12:08:44.17 |
+06:24:06.0 |
HIP 59170 |
24.23 |
| 2026-06-05 00:00 |
12:08:57.62 |
+06:23:30.9 |
HIP 59170 |
25.34 |
| 2026-06-05 12:00 |
12:09:11.31 |
+06:22:53.9 |
HIP 59170 |
26.85 |
| 2026-06-06 00:00 |
12:09:25.22 |
+06:22:14.9 |
HIP 59170 |
28.71 |
| 2026-06-06 12:00 |
12:09:39.36 |
+06:21:33.9 |
HIP 59401 |
29.19 |
| 2026-06-07 00:00 |
12:09:53.74 |
+06:20:51.0 |
HIP 59401 |
27.12 |
| 2026-06-07 12:00 |
12:10:08.34 |
+06:20:06.1 |
HIP 59401 |
25.40 |
| 2026-06-08 00:00 |
12:10:23.16 |
+06:19:19.3 |
HIP 59401 |
24.13 |
| 2026-06-08 12:00 |
12:10:38.22 |
+06:18:30.6 |
HIP 59401 |
23.41 |
| 2026-06-09 00:00 |
12:10:53.49 |
+06:17:40.0 |
HIP 59401 |
23.34 |
| 2026-06-09 12:00 |
12:11:08.99 |
+06:16:47.5 |
HIP 59520 |
22.49 |
| 2026-06-10 00:00 |
12:11:24.71 |
+06:15:53.1 |
HIP 59520 |
18.82 |
| 2026-06-10 12:00 |
12:11:40.66 |
+06:14:56.9 |
HIP 59520 |
15.28 |
| 2026-06-11 00:00 |
12:11:56.82 |
+06:13:58.9 |
HIP 59520 |
12.01 |
| 2026-06-11 12:00 |
12:12:13.20 |
+06:12:59.0 |
HIP 59520 |
9.40 |
| 2026-06-12 00:00 |
12:12:29.80 |
+06:11:57.3 |
HIP 59520 |
8.21 |
| 2026-06-12 12:00 |
12:12:46.61 |
+06:10:53.8 |
HIP 59520 |
9.10 |
| 2026-06-13 00:00 |
12:13:03.64 |
+06:09:48.5 |
HIP 59520 |
11.67 |
| 2026-06-13 12:00 |
12:13:20.88 |
+06:08:41.4 |
HIP 59520 |
15.13 |
| 2026-06-14 00:00 |
12:13:38.34 |
+06:07:32.6 |
HIP 59520 |
19.04 |
| 2026-06-14 12:00 |
12:13:56.00 |
+06:06:22.0 |
HIP 59520 |
23.21 |
| 2026-06-15 00:00 |
12:14:13.88 |
+06:05:09.7 |
HIP 59520 |
27.56 |
| 2026-06-15 12:00 |
12:14:31.96 |
+06:03:55.7 |
HIP 59840 |
27.40 |
| 2026-06-16 00:00 |
12:14:50.26 |
+06:02:39.9 |
HIP 59840 |
23.73 |
| 2026-06-16 12:00 |
12:15:08.75 |
+06:01:22.5 |
HIP 59840 |
20.47 |
| 2026-06-17 00:00 |
12:15:27.46 |
+06:00:03.5 |
HIP 59840 |
17.88 |
| 2026-06-17 12:00 |
12:15:46.36 |
+05:58:42.7 |
HIP 59840 |
16.36 |
| 2026-06-18 00:00 |
12:16:05.47 |
+05:57:20.4 |
HIP 59840 |
16.24 |
| 2026-06-18 12:00 |
12:16:24.78 |
+05:55:56.4 |
HIP 59840 |
17.61 |
| 2026-06-19 00:00 |
12:16:44.29 |
+05:54:30.8 |
HIP 59816 |
19.71 |
| 2026-06-19 12:00 |
12:17:03.99 |
+05:53:03.6 |
HIP 59816 |
21.90 |
| 2026-06-20 00:00 |
12:17:23.89 |
+05:51:34.9 |
HIP 59816 |
24.98 |
| 2026-06-20 12:00 |
12:17:43.98 |
+05:50:04.6 |
HIP 59816 |
28.71 |
| 2026-06-21 00:00 |
12:18:04.27 |
+05:48:32.7 |
HIP 60112 |
28.69 |
| 2026-06-21 12:00 |
12:18:24.74 |
+05:46:59.4 |
HIP 60133 |
23.52 |
| 2026-06-22 00:00 |
12:18:45.41 |
+05:45:24.5 |
HIP 60133 |
18.14 |