メタデータ
| 項目 |
値 |
| Designation |
P/2025 D2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2029-03-11T03:48:41.356800Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T11:43:03Z |
| Obs used |
28 |
| NEO |
- |
| M1 |
13.100 |
| 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) |
2025-06-06.0000000 |
| e |
0.14775937 |
| q (au) |
7.420030 |
| a (au) |
8.706497 |
| i (deg) |
5.358362 |
| Ω (om, deg) |
257.182305 |
| ω (w, deg) |
317.833163 |
| M (ma, deg) |
307.279945 |
等級
散乱 + 全体線形
$$
M_a = (2.448 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.448 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-03-26 00:00 |
10:26:43.89 |
+03:16:49.9 |
HIP 51250 |
20.49 |
| 2026-03-26 12:00 |
10:26:35.85 |
+03:17:48.7 |
HIP 51204 |
20.99 |
| 2026-03-27 00:00 |
10:26:27.90 |
+03:18:47.2 |
HIP 51204 |
21.64 |
| 2026-03-27 12:00 |
10:26:20.01 |
+03:19:45.4 |
HIP 51204 |
22.48 |
| 2026-03-28 00:00 |
10:26:12.21 |
+03:20:43.4 |
HIP 51204 |
23.47 |
| 2026-03-28 12:00 |
10:26:04.49 |
+03:21:41.1 |
HIP 51204 |
24.61 |
| 2026-03-29 00:00 |
10:25:56.86 |
+03:22:38.4 |
HIP 51204 |
25.85 |
| 2026-03-29 12:00 |
10:25:49.30 |
+03:23:35.5 |
HIP 51204 |
27.19 |
| 2026-03-30 00:00 |
10:25:41.83 |
+03:24:32.3 |
HIP 51204 |
28.61 |
| 2026-03-30 12:00 |
10:25:34.44 |
+03:25:28.8 |
HIP 51072 |
29.75 |
| 2026-03-31 00:00 |
10:25:27.14 |
+03:26:24.9 |
HIP 51072 |
29.43 |
| 2026-03-31 12:00 |
10:25:19.93 |
+03:27:20.7 |
HIP 51072 |
29.24 |
| 2026-04-01 00:00 |
10:25:12.81 |
+03:28:16.2 |
HIP 51072 |
29.19 |
| 2026-04-01 12:00 |
10:25:05.77 |
+03:29:11.4 |
HIP 51072 |
29.27 |
| 2026-04-02 00:00 |
10:24:58.82 |
+03:30:06.2 |
HIP 50865 |
28.38 |
| 2026-04-02 12:00 |
10:24:51.96 |
+03:31:00.6 |
HIP 50865 |
26.47 |
| 2026-04-03 00:00 |
10:24:45.19 |
+03:31:54.7 |
HIP 50865 |
24.59 |
| 2026-04-03 12:00 |
10:24:38.52 |
+03:32:48.4 |
HIP 50865 |
22.74 |
| 2026-04-04 00:00 |
10:24:31.94 |
+03:33:41.7 |
HIP 50865 |
20.92 |
| 2026-04-04 12:00 |
10:24:25.45 |
+03:34:34.7 |
HIP 50865 |
19.13 |
| 2026-04-05 00:00 |
10:24:19.05 |
+03:35:27.3 |
HIP 50865 |
17.38 |
| 2026-04-05 12:00 |
10:24:12.76 |
+03:36:19.4 |
HIP 50865 |
15.67 |
| 2026-04-06 00:00 |
10:24:06.55 |
+03:37:11.2 |
HIP 50865 |
14.01 |
| 2026-04-06 12:00 |
10:24:00.45 |
+03:38:02.6 |
HIP 50865 |
12.40 |
| 2026-04-07 00:00 |
10:23:54.44 |
+03:38:53.5 |
HIP 50865 |
10.85 |
| 2026-04-07 12:00 |
10:23:48.53 |
+03:39:44.1 |
HIP 50865 |
9.40 |
| 2026-04-08 00:00 |
10:23:42.72 |
+03:40:34.2 |
HIP 50865 |
8.06 |
| 2026-04-08 12:00 |
10:23:37.01 |
+03:41:23.9 |
HIP 50865 |
6.89 |
| 2026-04-09 00:00 |
10:23:31.39 |
+03:42:13.1 |
HIP 50865 |
5.98 |
| 2026-04-09 12:00 |
10:23:25.89 |
+03:43:01.9 |
HIP 50865 |
5.41 |
| 2026-04-10 00:00 |
10:23:20.48 |
+03:43:50.2 |
HIP 50865 |
5.29 |
| 2026-04-10 12:00 |
10:23:15.18 |
+03:44:38.1 |
HIP 50865 |
5.63 |
| 2026-04-11 00:00 |
10:23:09.98 |
+03:45:25.5 |
HIP 50865 |
6.32 |
| 2026-04-11 12:00 |
10:23:04.88 |
+03:46:12.5 |
HIP 50865 |
7.26 |
| 2026-04-12 00:00 |
10:22:59.89 |
+03:46:59.0 |
HIP 50865 |
8.35 |
| 2026-04-12 12:00 |
10:22:55.00 |
+03:47:45.0 |
HIP 50865 |
9.51 |
| 2026-04-13 00:00 |
10:22:50.22 |
+03:48:30.5 |
HIP 50865 |
10.73 |
| 2026-04-13 12:00 |
10:22:45.55 |
+03:49:15.5 |
HIP 50865 |
11.97 |
| 2026-04-14 00:00 |
10:22:40.99 |
+03:50:00.0 |
HIP 50865 |
13.21 |
| 2026-04-14 12:00 |
10:22:36.53 |
+03:50:44.0 |
HIP 50865 |
14.45 |
| 2026-04-15 00:00 |
10:22:32.19 |
+03:51:27.5 |
HIP 50865 |
15.69 |
| 2026-04-15 12:00 |
10:22:27.95 |
+03:52:10.5 |
HIP 50865 |
16.91 |
| 2026-04-16 00:00 |
10:22:23.82 |
+03:52:52.9 |
HIP 50865 |
18.11 |