C/2020 Q2 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2020 Q2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-02-06T10:13:35.472000Z |
| Orbit solution date (soln_date, UTC) |
2023-02-13T23:12:49Z |
| Obs used |
49 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-08-22T09:39:13.363200Z |
| Discovery magnitude (MPC) |
21.03 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) |
2020-09-06.0000000 |
| e |
0.50559490 |
| q (au) |
5.399394 |
| a (au) |
10.920993 |
| i (deg) |
3.310350 |
| Ω (om, deg) |
179.948112 |
| ω (w, deg) |
118.449735 |
| M (ma, deg) |
5.805249 |
等級
散乱 + 全体線形
$$
M_a = (9.351 + 4.380\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.351 |
| n |
4.380 |
| gf |
0.998 |
| gb |
-0.934 |
| k |
1.000 |
| 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 |
03:24:26.84 |
+15:39:54.0 |
HIP 15805 |
11.95 |
| 2026-02-03 12:00 |
03:24:28.04 |
+15:40:05.6 |
HIP 15805 |
12.24 |
| 2026-02-04 00:00 |
03:24:29.33 |
+15:40:17.6 |
HIP 15805 |
12.55 |
| 2026-02-04 12:00 |
03:24:30.72 |
+15:40:29.9 |
HIP 15805 |
12.89 |
| 2026-02-05 00:00 |
03:24:32.21 |
+15:40:42.6 |
HIP 15805 |
13.26 |
| 2026-02-05 12:00 |
03:24:33.79 |
+15:40:55.7 |
HIP 15805 |
13.65 |
| 2026-02-06 00:00 |
03:24:35.46 |
+15:41:09.1 |
HIP 15805 |
14.07 |
| 2026-02-06 12:00 |
03:24:37.23 |
+15:41:22.9 |
HIP 15951 |
13.80 |
| 2026-02-07 00:00 |
03:24:39.10 |
+15:41:37.0 |
HIP 15951 |
13.30 |
| 2026-02-07 12:00 |
03:24:41.06 |
+15:41:51.4 |
HIP 15951 |
12.78 |
| 2026-02-08 00:00 |
03:24:43.12 |
+15:42:06.2 |
HIP 15951 |
12.24 |
| 2026-02-08 12:00 |
03:24:45.27 |
+15:42:21.4 |
HIP 15951 |
11.67 |
| 2026-02-09 00:00 |
03:24:47.52 |
+15:42:36.8 |
HIP 15951 |
11.09 |
| 2026-02-09 12:00 |
03:24:49.86 |
+15:42:52.7 |
HIP 15951 |
10.48 |
| 2026-02-10 00:00 |
03:24:52.30 |
+15:43:08.8 |
HIP 15951 |
9.86 |
| 2026-02-10 12:00 |
03:24:54.83 |
+15:43:25.4 |
HIP 15951 |
9.22 |
| 2026-02-11 00:00 |
03:24:57.46 |
+15:43:42.2 |
HIP 15951 |
8.57 |
| 2026-02-11 12:00 |
03:25:00.18 |
+15:43:59.4 |
HIP 15951 |
7.90 |
| 2026-02-12 00:00 |
03:25:02.99 |
+15:44:16.9 |
HIP 15951 |
7.22 |
| 2026-02-12 12:00 |
03:25:05.90 |
+15:44:34.8 |
HIP 15951 |
6.54 |
| 2026-02-13 00:00 |
03:25:08.90 |
+15:44:53.0 |
HIP 15951 |
5.85 |
| 2026-02-13 12:00 |
03:25:11.99 |
+15:45:11.5 |
HIP 15951 |
5.18 |
| 2026-02-14 00:00 |
03:25:15.17 |
+15:45:30.3 |
HIP 15951 |
4.53 |
| 2026-02-14 12:00 |
03:25:18.45 |
+15:45:49.5 |
HIP 15951 |
3.94 |
| 2026-02-15 00:00 |
03:25:21.82 |
+15:46:09.0 |
HIP 15951 |
3.46 |
| 2026-02-15 12:00 |
03:25:25.29 |
+15:46:28.8 |
HIP 15951 |
3.14 |
| 2026-02-16 00:00 |
03:25:28.84 |
+15:46:48.9 |
HIP 15951 |
3.07 |
| 2026-02-16 12:00 |
03:25:32.49 |
+15:47:09.4 |
HIP 15951 |
3.28 |
| 2026-02-17 00:00 |
03:25:36.23 |
+15:47:30.1 |
HIP 15951 |
3.73 |
| 2026-02-17 12:00 |
03:25:40.06 |
+15:47:51.2 |
HIP 15951 |
4.38 |
| 2026-02-18 00:00 |
03:25:43.98 |
+15:48:12.6 |
HIP 15951 |
5.15 |
| 2026-02-18 12:00 |
03:25:47.99 |
+15:48:34.3 |
HIP 15951 |
6.01 |
| 2026-02-19 00:00 |
03:25:52.09 |
+15:48:56.3 |
HIP 15951 |
6.94 |
| 2026-02-19 12:00 |
03:25:56.28 |
+15:49:18.6 |
HIP 15951 |
7.93 |
| 2026-02-20 00:00 |
03:26:00.56 |
+15:49:41.2 |
HIP 15951 |
8.95 |
| 2026-02-20 12:00 |
03:26:04.93 |
+15:50:04.2 |
HIP 15951 |
10.01 |
| 2026-02-21 00:00 |
03:26:09.39 |
+15:50:27.4 |
HIP 15951 |
11.11 |
| 2026-02-21 12:00 |
03:26:13.94 |
+15:50:50.9 |
HIP 15951 |
12.23 |
| 2026-02-22 00:00 |
03:26:18.57 |
+15:51:14.7 |
HIP 15951 |
13.38 |
| 2026-02-22 12:00 |
03:26:23.29 |
+15:51:38.8 |
HIP 15951 |
14.56 |
| 2026-02-23 00:00 |
03:26:28.10 |
+15:52:03.1 |
HIP 15951 |
15.77 |
| 2026-02-23 12:00 |
03:26:33.00 |
+15:52:27.8 |
HIP 15951 |
16.99 |
| 2026-02-24 00:00 |
03:26:37.98 |
+15:52:52.7 |
HIP 15951 |
18.25 |