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) |
| 2026-09-25 00:00 |
14:40:05.80 |
-10:33:34.6 |
HIP 71632 |
16.07 |
| 2026-09-25 12:00 |
14:40:23.06 |
-10:36:00.1 |
HIP 71781 |
11.89 |
| 2026-09-26 00:00 |
14:40:40.39 |
-10:38:25.6 |
HIP 71781 |
7.11 |
| 2026-09-26 12:00 |
14:40:57.81 |
-10:40:51.2 |
HIP 71781 |
2.78 |
| 2026-09-27 00:00 |
14:41:15.30 |
-10:43:16.8 |
HIP 71781 |
3.66 |
| 2026-09-27 12:00 |
14:41:32.86 |
-10:45:42.4 |
HIP 71781 |
8.25 |
| 2026-09-28 00:00 |
14:41:50.50 |
-10:48:08.1 |
HIP 71781 |
13.12 |
| 2026-09-28 12:00 |
14:42:08.22 |
-10:50:33.8 |
HIP 71781 |
18.06 |
| 2026-09-29 00:00 |
14:42:26.00 |
-10:52:59.5 |
HIP 71982 |
21.99 |
| 2026-09-29 12:00 |
14:42:43.87 |
-10:55:25.3 |
HIP 71982 |
21.91 |
| 2026-09-30 00:00 |
14:43:01.80 |
-10:57:51.1 |
HIP 71982 |
22.94 |
| 2026-09-30 12:00 |
14:43:19.81 |
-11:00:16.9 |
HIP 71982 |
24.96 |
| 2026-10-01 00:00 |
14:43:37.88 |
-11:02:42.7 |
HIP 71982 |
27.77 |
| 2026-10-01 12:00 |
14:43:56.03 |
-11:05:08.6 |
HIP 71982 |
31.16 |
| 2026-10-02 00:00 |
14:44:14.26 |
-11:07:34.4 |
HIP 72168 |
27.40 |
| 2026-10-02 12:00 |
14:44:32.55 |
-11:10:00.3 |
HIP 72168 |
22.43 |
| 2026-10-03 00:00 |
14:44:50.91 |
-11:12:26.2 |
HIP 72168 |
17.54 |
| 2026-10-03 12:00 |
14:45:09.34 |
-11:14:52.0 |
HIP 72168 |
12.80 |
| 2026-10-04 00:00 |
14:45:27.83 |
-11:17:17.9 |
HIP 72168 |
8.52 |
| 2026-10-04 12:00 |
14:45:46.40 |
-11:19:43.8 |
HIP 72168 |
5.87 |
| 2026-10-05 00:00 |
14:46:05.03 |
-11:22:09.7 |
HIP 72168 |
7.06 |
| 2026-10-05 12:00 |
14:46:23.73 |
-11:24:35.5 |
HIP 72299 |
10.55 |
| 2026-10-06 00:00 |
14:46:42.50 |
-11:27:01.4 |
HIP 72299 |
7.47 |
| 2026-10-06 12:00 |
14:47:01.33 |
-11:29:27.2 |
HIP 72301 |
3.77 |
| 2026-10-07 00:00 |
14:47:20.22 |
-11:31:53.0 |
HIP 72301 |
3.74 |
| 2026-10-07 12:00 |
14:47:39.18 |
-11:34:18.8 |
HIP 72301 |
8.28 |
| 2026-10-08 00:00 |
14:47:58.21 |
-11:36:44.5 |
HIP 72301 |
13.36 |
| 2026-10-08 12:00 |
14:48:17.29 |
-11:39:10.3 |
HIP 72301 |
18.55 |
| 2026-10-09 00:00 |
14:48:36.44 |
-11:41:36.0 |
HIP 72301 |
23.79 |
| 2026-10-09 12:00 |
14:48:55.65 |
-11:44:01.6 |
HIP 72301 |
29.05 |
| 2026-10-10 00:00 |
14:49:14.92 |
-11:46:27.2 |
HIP 72596 |
24.69 |
| 2026-10-10 12:00 |
14:49:34.25 |
-11:48:52.8 |
HIP 72596 |
19.46 |
| 2026-10-11 00:00 |
14:49:53.64 |
-11:51:18.3 |
HIP 72596 |
14.29 |
| 2026-10-11 12:00 |
14:50:13.09 |
-11:53:43.8 |
HIP 72596 |
9.28 |
| 2026-10-12 00:00 |
14:50:32.60 |
-11:56:09.2 |
HIP 72596 |
5.02 |
| 2026-10-12 12:00 |
14:50:52.16 |
-11:58:34.5 |
HIP 72596 |
4.64 |
| 2026-10-13 00:00 |
14:51:11.78 |
-12:00:59.8 |
HIP 72596 |
8.70 |
| 2026-10-13 12:00 |
14:51:31.45 |
-12:03:25.0 |
HIP 72596 |
13.71 |
| 2026-10-14 00:00 |
14:51:51.18 |
-12:05:50.2 |
HIP 72596 |
18.93 |
| 2026-10-14 12:00 |
14:52:10.97 |
-12:08:15.2 |
HIP 72804 |
17.98 |
| 2026-10-15 00:00 |
14:52:30.80 |
-12:10:40.2 |
HIP 72804 |
13.48 |
| 2026-10-15 12:00 |
14:52:50.69 |
-12:13:05.2 |
HIP 72804 |
9.95 |
| 2026-10-16 00:00 |
14:53:10.64 |
-12:15:30.0 |
HIP 72804 |
8.67 |