メタデータ
| 項目 |
値 |
| Designation |
P/2021 U3 (Attard-Maury) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-10-24T20:33:36.668160Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:45:23Z |
| Obs used |
275 |
| NEO |
- |
| M1 |
16.800 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-10-24T07:31:22.080000Z |
| Discovery magnitude (MPC) |
19.20 G |
| Discovery observatory (MPC) |
W94 · MAPS, San Pedro de Atacama |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-11-24.0000000 |
| e |
0.54990855 |
| q (au) |
1.886801 |
| a (au) |
4.192038 |
| i (deg) |
69.962967 |
| Ω (om, deg) |
75.113082 |
| ω (w, deg) |
335.208488 |
| M (ma, deg) |
3.461445 |
等級
散乱 + 全体線形
$$
M_a = (16.431 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.431 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.746 |
| k |
0.988 |
| 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 |
16:36:48.76 |
+00:34:04.8 |
HIP 81375 |
19.46 |
| 2026-06-01 12:00 |
16:36:29.13 |
+00:33:25.8 |
HIP 81375 |
20.66 |
| 2026-06-02 00:00 |
16:36:09.50 |
+00:32:45.8 |
HIP 81192 |
22.06 |
| 2026-06-02 12:00 |
16:35:49.87 |
+00:32:04.7 |
HIP 81192 |
18.08 |
| 2026-06-03 00:00 |
16:35:30.25 |
+00:31:22.7 |
HIP 81192 |
14.68 |
| 2026-06-03 12:00 |
16:35:10.63 |
+00:30:39.6 |
HIP 81192 |
12.37 |
| 2026-06-04 00:00 |
16:34:51.02 |
+00:29:55.5 |
HIP 81192 |
11.79 |
| 2026-06-04 12:00 |
16:34:31.43 |
+00:29:10.3 |
HIP 81192 |
13.19 |
| 2026-06-05 00:00 |
16:34:11.84 |
+00:28:24.1 |
HIP 81192 |
16.05 |
| 2026-06-05 12:00 |
16:33:52.27 |
+00:27:36.9 |
HIP 81192 |
19.74 |
| 2026-06-06 00:00 |
16:33:32.72 |
+00:26:48.7 |
HIP 80995 |
21.80 |
| 2026-06-06 12:00 |
16:33:13.19 |
+00:25:59.4 |
HIP 80995 |
17.95 |
| 2026-06-07 00:00 |
16:32:53.68 |
+00:25:09.1 |
HIP 80995 |
14.76 |
| 2026-06-07 12:00 |
16:32:34.19 |
+00:24:17.8 |
HIP 80995 |
12.73 |
| 2026-06-08 00:00 |
16:32:14.73 |
+00:23:25.4 |
HIP 80995 |
12.44 |
| 2026-06-08 12:00 |
16:31:55.29 |
+00:22:32.0 |
HIP 80995 |
13.99 |
| 2026-06-09 00:00 |
16:31:35.89 |
+00:21:37.6 |
HIP 80995 |
16.89 |
| 2026-06-09 12:00 |
16:31:16.52 |
+00:20:42.2 |
HIP 80995 |
20.56 |
| 2026-06-10 00:00 |
16:30:57.18 |
+00:19:45.7 |
HIP 80995 |
24.66 |
| 2026-06-10 12:00 |
16:30:37.88 |
+00:18:48.2 |
HIP 80956 |
27.89 |
| 2026-06-11 00:00 |
16:30:18.63 |
+00:17:49.6 |
HIP 80708 |
28.11 |
| 2026-06-11 12:00 |
16:29:59.41 |
+00:16:50.1 |
HIP 80708 |
23.54 |
| 2026-06-12 00:00 |
16:29:40.23 |
+00:15:49.5 |
HIP 80708 |
19.13 |
| 2026-06-12 12:00 |
16:29:21.10 |
+00:14:47.9 |
HIP 80708 |
15.03 |
| 2026-06-13 00:00 |
16:29:02.02 |
+00:13:45.2 |
HIP 80708 |
11.55 |
| 2026-06-13 12:00 |
16:28:42.99 |
+00:12:41.6 |
HIP 80708 |
9.39 |
| 2026-06-14 00:00 |
16:28:24.01 |
+00:11:36.9 |
HIP 80708 |
9.49 |
| 2026-06-14 12:00 |
16:28:05.09 |
+00:10:31.2 |
HIP 80708 |
11.78 |
| 2026-06-15 00:00 |
16:27:46.22 |
+00:09:24.5 |
HIP 80708 |
15.30 |
| 2026-06-15 12:00 |
16:27:27.41 |
+00:08:16.7 |
HIP 80708 |
19.38 |
| 2026-06-16 00:00 |
16:27:08.67 |
+00:07:08.0 |
HIP 80708 |
23.73 |
| 2026-06-16 12:00 |
16:26:49.98 |
+00:05:58.2 |
HIP 80708 |
28.22 |
| 2026-06-17 00:00 |
16:26:31.37 |
+00:04:47.5 |
HIP 80708 |
32.78 |
| 2026-06-17 12:00 |
16:26:12.82 |
+00:03:35.7 |
HIP 80373 |
31.16 |
| 2026-06-18 00:00 |
16:25:54.34 |
+00:02:23.0 |
HIP 80373 |
26.58 |
| 2026-06-18 12:00 |
16:25:35.93 |
+00:01:09.2 |
HIP 80373 |
22.07 |
| 2026-06-19 00:00 |
16:25:17.59 |
-00:00:05.5 |
HIP 80373 |
17.71 |
| 2026-06-19 12:00 |
16:24:59.33 |
-00:01:21.2 |
HIP 80373 |
13.61 |
| 2026-06-20 00:00 |
16:24:41.15 |
-00:02:37.9 |
HIP 80373 |
10.08 |
| 2026-06-20 12:00 |
16:24:23.05 |
-00:03:55.5 |
HIP 80373 |
7.88 |
| 2026-06-21 00:00 |
16:24:05.03 |
-00:05:14.2 |
HIP 80373 |
8.16 |
| 2026-06-21 12:00 |
16:23:47.09 |
-00:06:33.7 |
HIP 80373 |
10.71 |
| 2026-06-22 00:00 |
16:23:29.24 |
-00:07:54.3 |
HIP 80266 |
9.58 |