メタデータ
| 項目 |
値 |
| Designation |
P/2020 M1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-12-21T02:45:38.859840Z |
| Orbit solution date (soln_date, UTC) |
2023-02-06T22:13:22Z |
| Obs used |
51 |
| NEO |
- |
| M1 |
12.400 |
| K1 |
15.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-06-17T08:46:29.568000Z |
| Discovery magnitude (MPC) |
21.30 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-06-01.0000000 |
| e |
0.47691810 |
| q (au) |
2.660801 |
| a (au) |
5.086778 |
| i (deg) |
8.632593 |
| Ω (om, deg) |
142.955182 |
| ω (w, deg) |
67.851133 |
| M (ma, deg) |
13.993326 |
等級
散乱 + 全体線形
$$
M_a = (14.862 + 5.819\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.862 |
| n |
5.819 |
| gf |
1.000 |
| gb |
-0.638 |
| 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) |
| 2026-07-29 00:00 |
03:11:35.19 |
+09:19:53.7 |
HIP 14803 |
10.18 |
| 2026-07-29 12:00 |
03:11:42.50 |
+09:19:51.5 |
HIP 14803 |
11.34 |
| 2026-07-30 00:00 |
03:11:49.72 |
+09:19:48.6 |
HIP 14803 |
12.63 |
| 2026-07-30 12:00 |
03:11:56.83 |
+09:19:45.3 |
HIP 14803 |
14.00 |
| 2026-07-31 00:00 |
03:12:03.84 |
+09:19:41.3 |
HIP 14803 |
15.42 |
| 2026-07-31 12:00 |
03:12:10.75 |
+09:19:36.9 |
HIP 14803 |
16.87 |
| 2026-08-01 00:00 |
03:12:17.55 |
+09:19:31.8 |
HIP 14803 |
18.33 |
| 2026-08-01 12:00 |
03:12:24.25 |
+09:19:26.2 |
HIP 14803 |
19.81 |
| 2026-08-02 00:00 |
03:12:30.84 |
+09:19:20.1 |
HIP 14803 |
21.28 |
| 2026-08-02 12:00 |
03:12:37.32 |
+09:19:13.4 |
HIP 14803 |
22.75 |
| 2026-08-03 00:00 |
03:12:43.70 |
+09:19:06.1 |
HIP 14803 |
24.21 |
| 2026-08-03 12:00 |
03:12:49.98 |
+09:18:58.3 |
HIP 15077 |
24.08 |
| 2026-08-04 00:00 |
03:12:56.14 |
+09:18:49.9 |
HIP 15077 |
22.59 |
| 2026-08-04 12:00 |
03:13:02.20 |
+09:18:41.0 |
HIP 15077 |
21.12 |
| 2026-08-05 00:00 |
03:13:08.15 |
+09:18:31.5 |
HIP 15077 |
19.67 |
| 2026-08-05 12:00 |
03:13:13.99 |
+09:18:21.4 |
HIP 15077 |
18.26 |
| 2026-08-06 00:00 |
03:13:19.72 |
+09:18:10.8 |
HIP 15077 |
16.87 |
| 2026-08-06 12:00 |
03:13:25.34 |
+09:17:59.6 |
HIP 15077 |
15.52 |
| 2026-08-07 00:00 |
03:13:30.85 |
+09:17:47.9 |
HIP 15077 |
14.19 |
| 2026-08-07 12:00 |
03:13:36.25 |
+09:17:35.6 |
HIP 15077 |
12.89 |
| 2026-08-08 00:00 |
03:13:41.54 |
+09:17:22.8 |
HIP 15077 |
11.63 |
| 2026-08-08 12:00 |
03:13:46.71 |
+09:17:09.3 |
HIP 15077 |
10.39 |
| 2026-08-09 00:00 |
03:13:51.77 |
+09:16:55.4 |
HIP 15077 |
9.20 |
| 2026-08-09 12:00 |
03:13:56.72 |
+09:16:40.9 |
HIP 15077 |
8.04 |
| 2026-08-10 00:00 |
03:14:01.55 |
+09:16:25.8 |
HIP 15077 |
6.94 |
| 2026-08-10 12:00 |
03:14:06.27 |
+09:16:10.1 |
HIP 15077 |
5.89 |
| 2026-08-11 00:00 |
03:14:10.87 |
+09:15:53.9 |
HIP 15077 |
4.91 |
| 2026-08-11 12:00 |
03:14:15.36 |
+09:15:37.2 |
HIP 15077 |
4.05 |
| 2026-08-12 00:00 |
03:14:19.73 |
+09:15:19.8 |
HIP 15077 |
3.36 |
| 2026-08-12 12:00 |
03:14:23.98 |
+09:15:02.0 |
HIP 15077 |
2.93 |
| 2026-08-13 00:00 |
03:14:28.12 |
+09:14:43.6 |
HIP 15077 |
2.86 |
| 2026-08-13 12:00 |
03:14:32.14 |
+09:14:24.6 |
HIP 15077 |
3.14 |
| 2026-08-14 00:00 |
03:14:36.04 |
+09:14:05.1 |
HIP 15077 |
3.67 |
| 2026-08-14 12:00 |
03:14:39.82 |
+09:13:45.0 |
HIP 15077 |
4.35 |
| 2026-08-15 00:00 |
03:14:43.48 |
+09:13:24.4 |
HIP 15077 |
5.10 |
| 2026-08-15 12:00 |
03:14:47.03 |
+09:13:03.2 |
HIP 15077 |
5.88 |
| 2026-08-16 00:00 |
03:14:50.45 |
+09:12:41.5 |
HIP 15077 |
6.67 |
| 2026-08-16 12:00 |
03:14:53.76 |
+09:12:19.2 |
HIP 15077 |
7.47 |
| 2026-08-17 00:00 |
03:14:56.95 |
+09:11:56.4 |
HIP 15077 |
8.25 |
| 2026-08-17 12:00 |
03:15:00.01 |
+09:11:33.0 |
HIP 15077 |
9.02 |
| 2026-08-18 00:00 |
03:15:02.95 |
+09:11:09.2 |
HIP 15077 |
9.78 |
| 2026-08-18 12:00 |
03:15:05.78 |
+09:10:44.7 |
HIP 15077 |
10.52 |
| 2026-08-19 00:00 |
03:15:08.48 |
+09:10:19.8 |
HIP 15077 |
11.24 |