メタデータ
| 項目 |
値 |
| Designation |
P/2025 D3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-07-25T15:47:32.513280Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T12:12:39Z |
| Obs used |
53 |
| NEO |
- |
| M1 |
17.500 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-02-22T10:22:18.192000Z |
| Discovery magnitude (MPC) |
21.65 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) |
2025-02-24.0000000 |
| e |
0.25244615 |
| q (au) |
2.965357 |
| a (au) |
3.966747 |
| i (deg) |
9.644276 |
| Ω (om, deg) |
186.635562 |
| ω (w, deg) |
294.451918 |
| M (ma, deg) |
26.615137 |
等級
散乱 + 全体線形
$$
M_a = (18.470 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.470 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.545 |
| 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) |
| 2026-07-29 00:00 |
15:03:50.73 |
-08:37:51.8 |
HIP 73781 |
18.61 |
| 2026-07-29 12:00 |
15:03:58.72 |
-08:39:03.7 |
HIP 73781 |
16.31 |
| 2026-07-30 00:00 |
15:04:06.91 |
-08:40:16.5 |
HIP 73781 |
13.97 |
| 2026-07-30 12:00 |
15:04:15.30 |
-08:41:30.1 |
HIP 73781 |
11.59 |
| 2026-07-31 00:00 |
15:04:23.89 |
-08:42:44.4 |
HIP 73781 |
9.17 |
| 2026-07-31 12:00 |
15:04:32.68 |
-08:43:59.5 |
HIP 73781 |
6.75 |
| 2026-08-01 00:00 |
15:04:41.66 |
-08:45:15.3 |
HIP 73781 |
4.38 |
| 2026-08-01 12:00 |
15:04:50.84 |
-08:46:31.9 |
HIP 73781 |
2.41 |
| 2026-08-02 00:00 |
15:05:00.21 |
-08:47:49.2 |
HIP 73781 |
2.48 |
| 2026-08-02 12:00 |
15:05:09.78 |
-08:49:07.2 |
HIP 73781 |
4.58 |
| 2026-08-03 00:00 |
15:05:19.54 |
-08:50:26.0 |
HIP 73781 |
7.15 |
| 2026-08-03 12:00 |
15:05:29.50 |
-08:51:45.5 |
HIP 73781 |
9.86 |
| 2026-08-04 00:00 |
15:05:39.64 |
-08:53:05.6 |
HIP 73781 |
12.65 |
| 2026-08-04 12:00 |
15:05:49.98 |
-08:54:26.5 |
HIP 73781 |
15.51 |
| 2026-08-05 00:00 |
15:06:00.51 |
-08:55:48.0 |
HIP 73984 |
17.10 |
| 2026-08-05 12:00 |
15:06:11.22 |
-08:57:10.3 |
HIP 73984 |
14.52 |
| 2026-08-06 00:00 |
15:06:22.13 |
-08:58:33.2 |
HIP 73984 |
12.09 |
| 2026-08-06 12:00 |
15:06:33.22 |
-08:59:56.7 |
HIP 73984 |
9.96 |
| 2026-08-07 00:00 |
15:06:44.51 |
-09:01:20.9 |
HIP 73984 |
8.40 |
| 2026-08-07 12:00 |
15:06:55.97 |
-09:02:45.8 |
HIP 73984 |
7.82 |
| 2026-08-08 00:00 |
15:07:07.63 |
-09:04:11.3 |
HIP 73984 |
8.49 |
| 2026-08-08 12:00 |
15:07:19.47 |
-09:05:37.4 |
HIP 73984 |
10.19 |
| 2026-08-09 00:00 |
15:07:31.49 |
-09:07:04.2 |
HIP 73984 |
12.56 |
| 2026-08-09 12:00 |
15:07:43.70 |
-09:08:31.5 |
HIP 73984 |
15.31 |
| 2026-08-10 00:00 |
15:07:56.09 |
-09:09:59.5 |
HIP 73984 |
18.30 |
| 2026-08-10 12:00 |
15:08:08.66 |
-09:11:28.0 |
HIP 73984 |
21.44 |
| 2026-08-11 00:00 |
15:08:21.41 |
-09:12:57.2 |
HIP 73984 |
24.70 |
| 2026-08-11 12:00 |
15:08:34.35 |
-09:14:26.9 |
HIP 73984 |
28.06 |
| 2026-08-12 00:00 |
15:08:47.46 |
-09:15:57.1 |
HIP 73984 |
31.49 |
| 2026-08-12 12:00 |
15:09:00.75 |
-09:17:28.0 |
HIP 74081 |
33.56 |
| 2026-08-13 00:00 |
15:09:14.22 |
-09:18:59.4 |
HIP 74081 |
33.33 |
| 2026-08-13 12:00 |
15:09:27.87 |
-09:20:31.3 |
HIP 74081 |
33.51 |
| 2026-08-14 00:00 |
15:09:41.69 |
-09:22:03.7 |
HIP 74246 |
32.63 |
| 2026-08-14 12:00 |
15:09:55.69 |
-09:23:36.7 |
HIP 74246 |
30.25 |
| 2026-08-15 00:00 |
15:10:09.86 |
-09:25:10.2 |
HIP 74246 |
28.15 |
| 2026-08-15 12:00 |
15:10:24.21 |
-09:26:44.2 |
HIP 74246 |
26.44 |
| 2026-08-16 00:00 |
15:10:38.72 |
-09:28:18.7 |
HIP 74246 |
25.21 |
| 2026-08-16 12:00 |
15:10:53.41 |
-09:29:53.6 |
HIP 74246 |
24.55 |
| 2026-08-17 00:00 |
15:11:08.27 |
-09:31:29.0 |
HIP 74246 |
24.53 |
| 2026-08-17 12:00 |
15:11:23.29 |
-09:33:04.9 |
HIP 74410 |
23.22 |
| 2026-08-18 00:00 |
15:11:38.49 |
-09:34:41.3 |
HIP 74410 |
22.29 |
| 2026-08-18 12:00 |
15:11:53.85 |
-09:36:18.1 |
HIP 74475 |
21.98 |
| 2026-08-19 00:00 |
15:12:09.37 |
-09:37:55.3 |
HIP 74475 |
17.98 |