メタデータ
| 項目 |
値 |
| Designation |
C/2020 K5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-06-05T14:17:47.019840Z |
| Orbit solution date (soln_date, UTC) |
2022-07-19T01:12:39Z |
| Obs used |
95 |
| NEO |
- |
| M1 |
15.100 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-05-25T12:10:42.297600Z |
| Discovery magnitude (MPC) |
20.79 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) |
2020-08-26.0000000 |
| e |
1.00134161 |
| q (au) |
1.535413 |
| a (au) |
-1144.452658 |
| i (deg) |
67.161983 |
| Ω (om, deg) |
86.163539 |
| ω (w, deg) |
249.602889 |
| M (ma, deg) |
-0.007219 |
等級
散乱 + 全体線形
$$
M_a = (14.860 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.860 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.998 |
| 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) |
| 2026-05-12 00:00 |
06:37:48.08 |
+51:16:33.0 |
HIP 31719 |
5.27 |
| 2026-05-12 12:00 |
06:37:56.99 |
+51:16:01.4 |
HIP 31719 |
4.16 |
| 2026-05-13 00:00 |
06:38:05.97 |
+51:15:29.9 |
HIP 31719 |
3.37 |
| 2026-05-13 12:00 |
06:38:15.00 |
+51:14:58.8 |
HIP 31719 |
3.16 |
| 2026-05-14 00:00 |
06:38:24.10 |
+51:14:27.8 |
HIP 31719 |
3.63 |
| 2026-05-14 12:00 |
06:38:33.26 |
+51:13:57.2 |
HIP 31719 |
4.59 |
| 2026-05-15 00:00 |
06:38:42.47 |
+51:13:26.8 |
HIP 31719 |
5.81 |
| 2026-05-15 12:00 |
06:38:51.75 |
+51:12:56.7 |
HIP 31719 |
7.16 |
| 2026-05-16 00:00 |
06:39:01.09 |
+51:12:26.8 |
HIP 31719 |
8.58 |
| 2026-05-16 12:00 |
06:39:10.48 |
+51:11:57.3 |
HIP 31719 |
10.05 |
| 2026-05-17 00:00 |
06:39:19.94 |
+51:11:28.0 |
HIP 31719 |
11.54 |
| 2026-05-17 12:00 |
06:39:29.45 |
+51:10:58.9 |
HIP 31719 |
13.07 |
| 2026-05-18 00:00 |
06:39:39.01 |
+51:10:30.1 |
HIP 31719 |
14.61 |
| 2026-05-18 12:00 |
06:39:48.63 |
+51:10:01.6 |
HIP 31719 |
16.16 |
| 2026-05-19 00:00 |
06:39:58.31 |
+51:09:33.4 |
HIP 31719 |
17.73 |
| 2026-05-19 12:00 |
06:40:08.04 |
+51:09:05.5 |
HIP 31719 |
19.31 |
| 2026-05-20 00:00 |
06:40:17.82 |
+51:08:37.8 |
HIP 32113 |
20.65 |
| 2026-05-20 12:00 |
06:40:27.66 |
+51:08:10.4 |
HIP 32113 |
19.06 |
| 2026-05-21 00:00 |
06:40:37.55 |
+51:07:43.3 |
HIP 32113 |
17.46 |
| 2026-05-21 12:00 |
06:40:47.49 |
+51:07:16.5 |
HIP 32113 |
15.85 |
| 2026-05-22 00:00 |
06:40:57.48 |
+51:06:50.0 |
HIP 32113 |
14.24 |
| 2026-05-22 12:00 |
06:41:07.52 |
+51:06:23.7 |
HIP 32113 |
12.63 |
| 2026-05-23 00:00 |
06:41:17.61 |
+51:05:57.8 |
HIP 32113 |
11.01 |
| 2026-05-23 12:00 |
06:41:27.75 |
+51:05:32.1 |
HIP 32113 |
9.40 |
| 2026-05-24 00:00 |
06:41:37.93 |
+51:05:06.7 |
HIP 32113 |
7.79 |
| 2026-05-24 12:00 |
06:41:48.17 |
+51:04:41.6 |
HIP 32113 |
6.20 |
| 2026-05-25 00:00 |
06:41:58.45 |
+51:04:16.8 |
HIP 32113 |
4.66 |
| 2026-05-25 12:00 |
06:42:08.78 |
+51:03:52.2 |
HIP 32113 |
3.22 |
| 2026-05-26 00:00 |
06:42:19.15 |
+51:03:28.0 |
HIP 32113 |
2.15 |
| 2026-05-26 12:00 |
06:42:29.57 |
+51:03:04.1 |
HIP 32113 |
2.12 |
| 2026-05-27 00:00 |
06:42:40.03 |
+51:02:40.4 |
HIP 32113 |
3.17 |
| 2026-05-27 12:00 |
06:42:50.53 |
+51:02:17.0 |
HIP 32113 |
4.62 |
| 2026-05-28 00:00 |
06:43:01.08 |
+51:01:54.0 |
HIP 32113 |
6.19 |
| 2026-05-28 12:00 |
06:43:11.67 |
+51:01:31.2 |
HIP 32113 |
7.83 |
| 2026-05-29 00:00 |
06:43:22.30 |
+51:01:08.7 |
HIP 32113 |
9.49 |
| 2026-05-29 12:00 |
06:43:32.98 |
+51:00:46.5 |
HIP 32113 |
11.18 |
| 2026-05-30 00:00 |
06:43:43.69 |
+51:00:24.7 |
HIP 32113 |
12.87 |
| 2026-05-30 12:00 |
06:43:54.44 |
+51:00:03.1 |
HIP 32113 |
14.58 |
| 2026-05-31 00:00 |
06:44:05.24 |
+50:59:41.8 |
HIP 32113 |
16.30 |
| 2026-05-31 12:00 |
06:44:16.07 |
+50:59:20.8 |
HIP 32113 |
18.02 |
| 2026-06-01 00:00 |
06:44:26.94 |
+50:59:00.1 |
HIP 32113 |
19.75 |
| 2026-06-01 12:00 |
06:44:37.85 |
+50:58:39.7 |
HIP 32113 |
21.49 |
| 2026-06-02 00:00 |
06:44:48.80 |
+50:58:19.6 |
HIP 32113 |
23.23 |