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) |
| 2026-03-26 00:00 |
17:07:42.38 |
+00:03:21.4 |
HIP 83731 |
19.40 |
| 2026-03-26 12:00 |
17:07:38.08 |
+00:04:02.4 |
HIP 83731 |
18.16 |
| 2026-03-27 00:00 |
17:07:33.61 |
+00:04:43.4 |
HIP 83731 |
16.90 |
| 2026-03-27 12:00 |
17:07:28.98 |
+00:05:24.3 |
HIP 83731 |
15.61 |
| 2026-03-28 00:00 |
17:07:24.18 |
+00:06:05.2 |
HIP 83731 |
14.31 |
| 2026-03-28 12:00 |
17:07:19.20 |
+00:06:46.1 |
HIP 83731 |
13.00 |
| 2026-03-29 00:00 |
17:07:14.06 |
+00:07:27.0 |
HIP 83731 |
11.69 |
| 2026-03-29 12:00 |
17:07:08.76 |
+00:08:07.8 |
HIP 83731 |
10.39 |
| 2026-03-30 00:00 |
17:07:03.28 |
+00:08:48.6 |
HIP 83731 |
9.14 |
| 2026-03-30 12:00 |
17:06:57.64 |
+00:09:29.3 |
HIP 83731 |
7.98 |
| 2026-03-31 00:00 |
17:06:51.82 |
+00:10:10.0 |
HIP 83731 |
6.97 |
| 2026-03-31 12:00 |
17:06:45.84 |
+00:10:50.5 |
HIP 83731 |
6.21 |
| 2026-04-01 00:00 |
17:06:39.69 |
+00:11:31.0 |
HIP 83731 |
5.85 |
| 2026-04-01 12:00 |
17:06:33.37 |
+00:12:11.4 |
HIP 83731 |
5.98 |
| 2026-04-02 00:00 |
17:06:26.89 |
+00:12:51.7 |
HIP 83731 |
6.61 |
| 2026-04-02 12:00 |
17:06:20.24 |
+00:13:31.8 |
HIP 83731 |
7.64 |
| 2026-04-03 00:00 |
17:06:13.41 |
+00:14:11.9 |
HIP 83731 |
8.95 |
| 2026-04-03 12:00 |
17:06:06.43 |
+00:14:51.8 |
HIP 83731 |
10.46 |
| 2026-04-04 00:00 |
17:05:59.27 |
+00:15:31.5 |
HIP 83731 |
12.12 |
| 2026-04-04 12:00 |
17:05:51.95 |
+00:16:11.2 |
HIP 83731 |
13.88 |
| 2026-04-05 00:00 |
17:05:44.45 |
+00:16:50.6 |
HIP 83731 |
15.73 |
| 2026-04-05 12:00 |
17:05:36.80 |
+00:17:29.9 |
HIP 83731 |
17.65 |
| 2026-04-06 00:00 |
17:05:28.97 |
+00:18:09.0 |
HIP 83731 |
19.63 |
| 2026-04-06 12:00 |
17:05:20.98 |
+00:18:47.9 |
HIP 83731 |
21.67 |
| 2026-04-07 00:00 |
17:05:12.82 |
+00:19:26.7 |
HIP 83601 |
22.78 |
| 2026-04-07 12:00 |
17:05:04.49 |
+00:20:05.2 |
HIP 83601 |
22.33 |
| 2026-04-08 00:00 |
17:04:56.00 |
+00:20:43.5 |
HIP 83601 |
22.10 |
| 2026-04-08 12:00 |
17:04:47.35 |
+00:21:21.6 |
HIP 83601 |
22.11 |
| 2026-04-09 00:00 |
17:04:38.52 |
+00:21:59.4 |
HIP 83601 |
22.37 |
| 2026-04-09 12:00 |
17:04:29.54 |
+00:22:37.0 |
HIP 83601 |
22.88 |
| 2026-04-10 00:00 |
17:04:20.38 |
+00:23:14.4 |
HIP 83419 |
21.03 |
| 2026-04-10 12:00 |
17:04:11.07 |
+00:23:51.5 |
HIP 83419 |
19.17 |
| 2026-04-11 00:00 |
17:04:01.58 |
+00:24:28.3 |
HIP 83419 |
17.40 |
| 2026-04-11 12:00 |
17:03:51.94 |
+00:25:04.8 |
HIP 83419 |
15.79 |
| 2026-04-12 00:00 |
17:03:42.13 |
+00:25:41.0 |
HIP 83419 |
14.39 |
| 2026-04-12 12:00 |
17:03:32.16 |
+00:26:17.0 |
HIP 83419 |
13.31 |
| 2026-04-13 00:00 |
17:03:22.03 |
+00:26:52.6 |
HIP 83419 |
12.63 |
| 2026-04-13 12:00 |
17:03:11.73 |
+00:27:27.9 |
HIP 83419 |
12.46 |
| 2026-04-14 00:00 |
17:03:01.27 |
+00:28:02.8 |
HIP 83419 |
12.84 |
| 2026-04-14 12:00 |
17:02:50.66 |
+00:28:37.4 |
HIP 83419 |
13.74 |
| 2026-04-15 00:00 |
17:02:39.88 |
+00:29:11.6 |
HIP 83419 |
15.10 |
| 2026-04-15 12:00 |
17:02:28.94 |
+00:29:45.5 |
HIP 83419 |
16.81 |
| 2026-04-16 00:00 |
17:02:17.85 |
+00:30:19.0 |
HIP 83419 |
18.80 |