P/2020 X1 (ATLAS)
メタデータ
| 項目 |
値 |
| Designation |
P/2020 X1 (ATLAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-07-20T02:53:09.418560Z |
| Orbit solution date (soln_date, UTC) |
2024-04-16T14:26:07Z |
| Obs used |
96 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
21.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-12-04T10:41:02.601600Z |
| Discovery magnitude (MPC) |
18.92 o |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-01-23.0000000 |
| e |
0.36528017 |
| q (au) |
2.871814 |
| a (au) |
4.524538 |
| i (deg) |
31.703026 |
| Ω (om, deg) |
56.028268 |
| ω (w, deg) |
323.208571 |
| M (ma, deg) |
19.138368 |
等級
散乱 + 全体線形
$$
M_a = (15.087 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.087 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
15:06:17.80 |
-05:00:43.1 |
HIP 73843 |
12.10 |
| 2026-02-03 12:00 |
15:06:23.99 |
-05:00:57.9 |
HIP 73843 |
13.64 |
| 2026-02-04 00:00 |
15:06:30.03 |
-05:01:11.9 |
HIP 73843 |
15.15 |
| 2026-02-04 12:00 |
15:06:35.93 |
-05:01:25.2 |
HIP 73843 |
16.63 |
| 2026-02-05 00:00 |
15:06:41.67 |
-05:01:37.8 |
HIP 73843 |
18.07 |
| 2026-02-05 12:00 |
15:06:47.27 |
-05:01:49.8 |
HIP 73843 |
19.47 |
| 2026-02-06 00:00 |
15:06:52.72 |
-05:02:01.0 |
HIP 73843 |
20.84 |
| 2026-02-06 12:00 |
15:06:58.01 |
-05:02:11.6 |
HIP 73843 |
22.17 |
| 2026-02-07 00:00 |
15:07:03.15 |
-05:02:21.5 |
HIP 73843 |
23.46 |
| 2026-02-07 12:00 |
15:07:08.14 |
-05:02:30.7 |
HIP 73843 |
24.71 |
| 2026-02-08 00:00 |
15:07:12.97 |
-05:02:39.2 |
HIP 73843 |
25.92 |
| 2026-02-08 12:00 |
15:07:17.65 |
-05:02:47.0 |
HIP 73843 |
27.09 |
| 2026-02-09 00:00 |
15:07:22.17 |
-05:02:54.2 |
HIP 73843 |
28.22 |
| 2026-02-09 12:00 |
15:07:26.54 |
-05:03:00.6 |
HIP 74020 |
29.09 |
| 2026-02-10 00:00 |
15:07:30.74 |
-05:03:06.4 |
HIP 74020 |
29.13 |
| 2026-02-10 12:00 |
15:07:34.80 |
-05:03:11.6 |
HIP 74020 |
29.19 |
| 2026-02-11 00:00 |
15:07:38.69 |
-05:03:16.0 |
HIP 74020 |
29.28 |
| 2026-02-11 12:00 |
15:07:42.42 |
-05:03:19.8 |
HIP 74020 |
29.38 |
| 2026-02-12 00:00 |
15:07:46.00 |
-05:03:22.9 |
HIP 74020 |
29.50 |
| 2026-02-12 12:00 |
15:07:49.41 |
-05:03:25.4 |
HIP 74020 |
29.63 |
| 2026-02-13 00:00 |
15:07:52.66 |
-05:03:27.2 |
HIP 74020 |
29.76 |
| 2026-02-13 12:00 |
15:07:55.75 |
-05:03:28.3 |
HIP 74020 |
29.90 |
| 2026-02-14 00:00 |
15:07:58.68 |
-05:03:28.8 |
HIP 74020 |
30.04 |
| 2026-02-14 12:00 |
15:08:01.44 |
-05:03:28.6 |
HIP 74020 |
30.18 |
| 2026-02-15 00:00 |
15:08:04.05 |
-05:03:27.8 |
HIP 74188 |
30.31 |
| 2026-02-15 12:00 |
15:08:06.48 |
-05:03:26.3 |
HIP 74188 |
29.88 |
| 2026-02-16 00:00 |
15:08:08.75 |
-05:03:24.2 |
HIP 74188 |
29.49 |
| 2026-02-16 12:00 |
15:08:10.86 |
-05:03:21.4 |
HIP 74188 |
29.14 |
| 2026-02-17 00:00 |
15:08:12.80 |
-05:03:18.1 |
HIP 74188 |
28.84 |
| 2026-02-17 12:00 |
15:08:14.58 |
-05:03:14.0 |
HIP 74188 |
28.57 |
| 2026-02-18 00:00 |
15:08:16.18 |
-05:03:09.4 |
HIP 74188 |
28.35 |
| 2026-02-18 12:00 |
15:08:17.63 |
-05:03:04.1 |
HIP 74188 |
28.17 |
| 2026-02-19 00:00 |
15:08:18.90 |
-05:02:58.3 |
HIP 74188 |
28.03 |
| 2026-02-19 12:00 |
15:08:20.00 |
-05:02:51.8 |
HIP 74199 |
27.86 |
| 2026-02-20 00:00 |
15:08:20.94 |
-05:02:44.7 |
HIP 74199 |
27.61 |
| 2026-02-20 12:00 |
15:08:21.71 |
-05:02:37.0 |
HIP 74199 |
27.38 |
| 2026-02-21 00:00 |
15:08:22.31 |
-05:02:28.7 |
HIP 74199 |
27.17 |
| 2026-02-21 12:00 |
15:08:22.74 |
-05:02:19.8 |
HIP 74199 |
27.00 |
| 2026-02-22 00:00 |
15:08:23.00 |
-05:02:10.3 |
HIP 74199 |
26.85 |
| 2026-02-22 12:00 |
15:08:23.09 |
-05:02:00.2 |
HIP 74199 |
26.72 |
| 2026-02-23 00:00 |
15:08:23.01 |
-05:01:49.5 |
HIP 74199 |
26.62 |
| 2026-02-23 12:00 |
15:08:22.75 |
-05:01:38.3 |
HIP 74199 |
26.56 |
| 2026-02-24 00:00 |
15:08:22.33 |
-05:01:26.5 |
HIP 74199 |
26.52 |