メタデータ
| 項目 |
値 |
| Designation |
P/2025 D2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2029-03-11T21:54:39.648960Z |
| Orbit solution date (soln_date, UTC) |
2026-04-21T11:12:20Z |
| Obs used |
31 |
| NEO |
- |
| M1 |
13.200 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-02-22T07:51:00.662400Z |
| Discovery magnitude (MPC) |
22.06 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) |
2025-07-07.0000000 |
| e |
0.14784789 |
| q (au) |
7.418671 |
| a (au) |
8.705807 |
| i (deg) |
5.358338 |
| Ω (om, deg) |
257.181922 |
| ω (w, deg) |
317.883851 |
| M (ma, deg) |
308.434208 |
等級
散乱 + 全体線形
$$
M_a = (3.187 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.187 |
| n |
6.000 |
| gf |
0.999 |
| 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
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 |
10:24:19.68 |
+04:13:38.1 |
HIP 50983 |
19.25 |
| 2026-06-01 12:00 |
10:24:26.20 |
+04:13:20.6 |
HIP 50983 |
18.90 |
| 2026-06-02 00:00 |
10:24:32.83 |
+04:13:02.4 |
HIP 50983 |
18.69 |
| 2026-06-02 12:00 |
10:24:39.56 |
+04:12:43.6 |
HIP 50983 |
18.64 |
| 2026-06-03 00:00 |
10:24:46.40 |
+04:12:24.1 |
HIP 50983 |
18.76 |
| 2026-06-03 12:00 |
10:24:53.33 |
+04:12:03.9 |
HIP 50983 |
19.05 |
| 2026-06-04 00:00 |
10:25:00.37 |
+04:11:43.1 |
HIP 50983 |
19.50 |
| 2026-06-04 12:00 |
10:25:07.52 |
+04:11:21.5 |
HIP 50983 |
20.12 |
| 2026-06-05 00:00 |
10:25:14.76 |
+04:10:59.4 |
HIP 51075 |
20.26 |
| 2026-06-05 12:00 |
10:25:22.10 |
+04:10:36.6 |
HIP 51075 |
18.78 |
| 2026-06-06 00:00 |
10:25:29.55 |
+04:10:13.1 |
HIP 51075 |
17.36 |
| 2026-06-06 12:00 |
10:25:37.09 |
+04:09:48.9 |
HIP 51075 |
16.01 |
| 2026-06-07 00:00 |
10:25:44.74 |
+04:09:24.1 |
HIP 51075 |
14.77 |
| 2026-06-07 12:00 |
10:25:52.48 |
+04:08:58.6 |
HIP 51075 |
13.68 |
| 2026-06-08 00:00 |
10:26:00.32 |
+04:08:32.5 |
HIP 51075 |
12.78 |
| 2026-06-08 12:00 |
10:26:08.27 |
+04:08:05.7 |
HIP 51075 |
12.15 |
| 2026-06-09 00:00 |
10:26:16.31 |
+04:07:38.3 |
HIP 51075 |
11.82 |
| 2026-06-09 12:00 |
10:26:24.44 |
+04:07:10.2 |
HIP 51075 |
11.84 |
| 2026-06-10 00:00 |
10:26:32.68 |
+04:06:41.5 |
HIP 51075 |
12.23 |
| 2026-06-10 12:00 |
10:26:41.01 |
+04:06:12.1 |
HIP 51075 |
12.96 |
| 2026-06-11 00:00 |
10:26:49.44 |
+04:05:42.0 |
HIP 51075 |
13.99 |
| 2026-06-11 12:00 |
10:26:57.96 |
+04:05:11.3 |
HIP 51075 |
15.27 |
| 2026-06-12 00:00 |
10:27:06.58 |
+04:04:40.0 |
HIP 51190 |
14.43 |
| 2026-06-12 12:00 |
10:27:15.30 |
+04:04:08.0 |
HIP 51190 |
13.40 |
| 2026-06-13 00:00 |
10:27:24.11 |
+04:03:35.3 |
HIP 51190 |
12.67 |
| 2026-06-13 12:00 |
10:27:33.01 |
+04:03:02.1 |
HIP 51190 |
12.32 |
| 2026-06-14 00:00 |
10:27:42.01 |
+04:02:28.1 |
HIP 51190 |
12.38 |
| 2026-06-14 12:00 |
10:27:51.10 |
+04:01:53.5 |
HIP 51190 |
12.87 |
| 2026-06-15 00:00 |
10:28:00.29 |
+04:01:18.3 |
HIP 51190 |
13.76 |
| 2026-06-15 12:00 |
10:28:09.56 |
+04:00:42.4 |
HIP 51190 |
14.97 |
| 2026-06-16 00:00 |
10:28:18.93 |
+04:00:05.9 |
HIP 51190 |
16.46 |
| 2026-06-16 12:00 |
10:28:28.39 |
+03:59:28.8 |
HIP 51370 |
16.76 |
| 2026-06-17 00:00 |
10:28:37.94 |
+03:58:51.0 |
HIP 51370 |
14.31 |
| 2026-06-17 12:00 |
10:28:47.58 |
+03:58:12.6 |
HIP 51370 |
11.84 |
| 2026-06-18 00:00 |
10:28:57.31 |
+03:57:33.6 |
HIP 51370 |
9.35 |
| 2026-06-18 12:00 |
10:29:07.13 |
+03:56:53.9 |
HIP 51370 |
6.86 |
| 2026-06-19 00:00 |
10:29:17.04 |
+03:56:13.6 |
HIP 51370 |
4.39 |
| 2026-06-19 12:00 |
10:29:27.03 |
+03:55:32.7 |
HIP 51370 |
2.13 |
| 2026-06-20 00:00 |
10:29:37.11 |
+03:54:51.2 |
HIP 51370 |
1.79 |
| 2026-06-20 12:00 |
10:29:47.28 |
+03:54:09.0 |
HIP 51370 |
3.95 |
| 2026-06-21 00:00 |
10:29:57.53 |
+03:53:26.3 |
HIP 51370 |
6.50 |
| 2026-06-21 12:00 |
10:30:07.87 |
+03:52:42.9 |
HIP 51370 |
9.13 |
| 2026-06-22 00:00 |
10:30:18.29 |
+03:51:58.9 |
HIP 51370 |
11.80 |