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) |
| 2026-07-29 00:00 |
10:46:26.55 |
+02:32:11.6 |
HIP 52774 |
14.78 |
| 2026-07-29 12:00 |
10:46:41.78 |
+02:30:48.5 |
HIP 52774 |
11.60 |
| 2026-07-30 00:00 |
10:46:57.06 |
+02:29:25.1 |
HIP 52774 |
9.13 |
| 2026-07-30 12:00 |
10:47:12.38 |
+02:28:01.2 |
HIP 52774 |
8.07 |
| 2026-07-31 00:00 |
10:47:27.74 |
+02:26:37.0 |
HIP 52774 |
8.96 |
| 2026-07-31 12:00 |
10:47:43.14 |
+02:25:12.3 |
HIP 52774 |
11.36 |
| 2026-08-01 00:00 |
10:47:58.59 |
+02:23:47.2 |
HIP 52856 |
8.19 |
| 2026-08-01 12:00 |
10:48:14.08 |
+02:22:21.7 |
HIP 52856 |
4.40 |
| 2026-08-02 00:00 |
10:48:29.61 |
+02:20:55.8 |
HIP 52856 |
2.38 |
| 2026-08-02 12:00 |
10:48:45.17 |
+02:19:29.4 |
HIP 52856 |
5.13 |
| 2026-08-03 00:00 |
10:49:00.78 |
+02:18:02.7 |
HIP 52856 |
9.03 |
| 2026-08-03 12:00 |
10:49:16.43 |
+02:16:35.6 |
HIP 52856 |
13.10 |
| 2026-08-04 00:00 |
10:49:32.11 |
+02:15:08.1 |
HIP 52856 |
17.23 |
| 2026-08-04 12:00 |
10:49:47.84 |
+02:13:40.2 |
HIP 52856 |
21.39 |
| 2026-08-05 00:00 |
10:50:03.60 |
+02:12:12.0 |
HIP 52856 |
25.58 |
| 2026-08-05 12:00 |
10:50:19.40 |
+02:10:43.3 |
HIP 52856 |
29.78 |
| 2026-08-06 00:00 |
10:50:35.23 |
+02:09:14.2 |
HIP 53187 |
32.61 |
| 2026-08-06 12:00 |
10:50:51.11 |
+02:07:44.8 |
HIP 53187 |
28.57 |
| 2026-08-07 00:00 |
10:51:07.02 |
+02:06:15.0 |
HIP 53187 |
24.58 |
| 2026-08-07 12:00 |
10:51:22.96 |
+02:04:44.8 |
HIP 53187 |
20.69 |
| 2026-08-08 00:00 |
10:51:38.94 |
+02:03:14.2 |
HIP 53187 |
16.97 |
| 2026-08-08 12:00 |
10:51:54.95 |
+02:01:43.3 |
HIP 53187 |
13.56 |
| 2026-08-09 00:00 |
10:52:11.00 |
+02:00:12.0 |
HIP 53187 |
10.80 |
| 2026-08-09 12:00 |
10:52:27.08 |
+01:58:40.3 |
HIP 53187 |
9.28 |
| 2026-08-10 00:00 |
10:52:43.20 |
+01:57:08.3 |
HIP 53187 |
9.62 |
| 2026-08-10 12:00 |
10:52:59.34 |
+01:55:35.9 |
HIP 53185 |
11.61 |
| 2026-08-11 00:00 |
10:53:15.52 |
+01:54:03.2 |
HIP 53185 |
12.23 |
| 2026-08-11 12:00 |
10:53:31.73 |
+01:52:30.1 |
HIP 53185 |
14.20 |
| 2026-08-12 00:00 |
10:53:47.97 |
+01:50:56.6 |
HIP 53185 |
17.08 |
| 2026-08-12 12:00 |
10:54:04.24 |
+01:49:22.8 |
HIP 53185 |
20.49 |
| 2026-08-13 00:00 |
10:54:20.54 |
+01:47:48.7 |
HIP 53185 |
24.21 |
| 2026-08-13 12:00 |
10:54:36.87 |
+01:46:14.2 |
HIP 53185 |
28.12 |
| 2026-08-14 00:00 |
10:54:53.22 |
+01:44:39.4 |
HIP 53464 |
27.46 |
| 2026-08-14 12:00 |
10:55:09.61 |
+01:43:04.3 |
HIP 53464 |
25.89 |
| 2026-08-15 00:00 |
10:55:26.02 |
+01:41:28.8 |
HIP 53464 |
25.01 |
| 2026-08-15 12:00 |
10:55:42.46 |
+01:39:53.0 |
HIP 53464 |
24.88 |
| 2026-08-16 00:00 |
10:55:58.92 |
+01:38:16.9 |
HIP 53464 |
25.53 |
| 2026-08-16 12:00 |
10:56:15.41 |
+01:36:40.5 |
HIP 53464 |
26.91 |
| 2026-08-17 00:00 |
10:56:31.92 |
+01:35:03.8 |
HIP 53464 |
28.91 |
| 2026-08-17 12:00 |
10:56:48.46 |
+01:33:26.7 |
HIP 53464 |
31.41 |
| 2026-08-18 00:00 |
10:57:05.02 |
+01:31:49.4 |
HIP 53666 |
28.31 |
| 2026-08-18 12:00 |
10:57:21.61 |
+01:30:11.7 |
HIP 53666 |
25.45 |
| 2026-08-19 00:00 |
10:57:38.21 |
+01:28:33.7 |
HIP 53666 |
23.09 |