P/2021 U3 (Attard-Maury)
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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
17:01:28.40 |
-00:42:45.6 |
HIP 83293 |
4.63 |
| 2026-02-03 12:00 |
17:01:38.77 |
-00:42:42.7 |
HIP 83293 |
6.04 |
| 2026-02-04 00:00 |
17:01:49.03 |
-00:42:39.2 |
HIP 83293 |
8.04 |
| 2026-02-04 12:00 |
17:01:59.19 |
-00:42:35.0 |
HIP 83293 |
10.28 |
| 2026-02-05 00:00 |
17:02:09.24 |
-00:42:30.2 |
HIP 83293 |
12.61 |
| 2026-02-05 12:00 |
17:02:19.18 |
-00:42:24.8 |
HIP 83293 |
14.97 |
| 2026-02-06 00:00 |
17:02:29.01 |
-00:42:18.8 |
HIP 83293 |
17.35 |
| 2026-02-06 12:00 |
17:02:38.74 |
-00:42:12.1 |
HIP 83293 |
19.73 |
| 2026-02-07 00:00 |
17:02:48.35 |
-00:42:04.9 |
HIP 83293 |
22.09 |
| 2026-02-07 12:00 |
17:02:57.84 |
-00:41:57.0 |
HIP 83293 |
24.43 |
| 2026-02-08 00:00 |
17:03:07.23 |
-00:41:48.4 |
HIP 83293 |
26.76 |
| 2026-02-08 12:00 |
17:03:16.50 |
-00:41:39.3 |
HIP 83293 |
29.06 |
| 2026-02-09 00:00 |
17:03:25.66 |
-00:41:29.6 |
HIP 83293 |
31.34 |
| 2026-02-09 12:00 |
17:03:34.70 |
-00:41:19.3 |
HIP 83635 |
31.82 |
| 2026-02-10 00:00 |
17:03:43.62 |
-00:41:08.3 |
HIP 83635 |
29.85 |
| 2026-02-10 12:00 |
17:03:52.43 |
-00:40:56.8 |
HIP 83635 |
27.95 |
| 2026-02-11 00:00 |
17:04:01.11 |
-00:40:44.7 |
HIP 83635 |
26.12 |
| 2026-02-11 12:00 |
17:04:09.68 |
-00:40:32.0 |
HIP 83635 |
24.39 |
| 2026-02-12 00:00 |
17:04:18.13 |
-00:40:18.7 |
HIP 83635 |
22.76 |
| 2026-02-12 12:00 |
17:04:26.46 |
-00:40:04.9 |
HIP 83635 |
21.24 |
| 2026-02-13 00:00 |
17:04:34.66 |
-00:39:50.4 |
HIP 83635 |
19.86 |
| 2026-02-13 12:00 |
17:04:42.74 |
-00:39:35.4 |
HIP 83635 |
18.64 |
| 2026-02-14 00:00 |
17:04:50.70 |
-00:39:19.9 |
HIP 83635 |
17.59 |
| 2026-02-14 12:00 |
17:04:58.53 |
-00:39:03.8 |
HIP 83635 |
16.74 |
| 2026-02-15 00:00 |
17:05:06.24 |
-00:38:47.1 |
HIP 83635 |
16.11 |
| 2026-02-15 12:00 |
17:05:13.82 |
-00:38:29.8 |
HIP 83635 |
15.72 |
| 2026-02-16 00:00 |
17:05:21.27 |
-00:38:12.1 |
HIP 83635 |
15.57 |
| 2026-02-16 12:00 |
17:05:28.60 |
-00:37:53.7 |
HIP 83635 |
15.65 |
| 2026-02-17 00:00 |
17:05:35.79 |
-00:37:34.9 |
HIP 83635 |
15.97 |
| 2026-02-17 12:00 |
17:05:42.86 |
-00:37:15.5 |
HIP 83635 |
16.48 |
| 2026-02-18 00:00 |
17:05:49.79 |
-00:36:55.6 |
HIP 83737 |
17.07 |
| 2026-02-18 12:00 |
17:05:56.60 |
-00:36:35.2 |
HIP 83737 |
15.39 |
| 2026-02-19 00:00 |
17:06:03.27 |
-00:36:14.2 |
HIP 83737 |
13.74 |
| 2026-02-19 12:00 |
17:06:09.81 |
-00:35:52.8 |
HIP 83737 |
12.14 |
| 2026-02-20 00:00 |
17:06:16.21 |
-00:35:30.8 |
HIP 83737 |
10.58 |
| 2026-02-20 12:00 |
17:06:22.48 |
-00:35:08.4 |
HIP 83737 |
9.07 |
| 2026-02-21 00:00 |
17:06:28.61 |
-00:34:45.4 |
HIP 83737 |
7.62 |
| 2026-02-21 12:00 |
17:06:34.61 |
-00:34:22.0 |
HIP 83737 |
6.26 |
| 2026-02-22 00:00 |
17:06:40.46 |
-00:33:58.1 |
HIP 83737 |
5.02 |
| 2026-02-22 12:00 |
17:06:46.19 |
-00:33:33.8 |
HIP 83737 |
3.98 |
| 2026-02-23 00:00 |
17:06:51.77 |
-00:33:08.9 |
HIP 83737 |
3.30 |
| 2026-02-23 12:00 |
17:06:57.21 |
-00:32:43.6 |
HIP 83737 |
3.17 |
| 2026-02-24 00:00 |
17:07:02.52 |
-00:32:17.9 |
HIP 83737 |
3.60 |