C/2020 K5 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
06:39:19.74 |
+53:24:03.5 |
HIP 31695 |
14.75 |
| 2026-02-03 12:00 |
06:39:08.70 |
+53:23:44.6 |
HIP 31695 |
13.49 |
| 2026-02-04 00:00 |
06:38:57.75 |
+53:23:25.2 |
HIP 31695 |
12.35 |
| 2026-02-04 12:00 |
06:38:46.89 |
+53:23:05.2 |
HIP 31695 |
11.35 |
| 2026-02-05 00:00 |
06:38:36.12 |
+53:22:44.7 |
HIP 31695 |
10.54 |
| 2026-02-05 12:00 |
06:38:25.44 |
+53:22:23.6 |
HIP 31695 |
9.94 |
| 2026-02-06 00:00 |
06:38:14.85 |
+53:22:02.0 |
HIP 31695 |
9.60 |
| 2026-02-06 12:00 |
06:38:04.35 |
+53:21:39.9 |
HIP 31695 |
9.54 |
| 2026-02-07 00:00 |
06:37:53.95 |
+53:21:17.2 |
HIP 31640 |
9.25 |
| 2026-02-07 12:00 |
06:37:43.65 |
+53:20:54.1 |
HIP 31640 |
8.71 |
| 2026-02-08 00:00 |
06:37:33.44 |
+53:20:30.4 |
HIP 31640 |
8.46 |
| 2026-02-08 12:00 |
06:37:23.32 |
+53:20:06.2 |
HIP 31640 |
8.51 |
| 2026-02-09 00:00 |
06:37:13.31 |
+53:19:41.5 |
HIP 31640 |
8.84 |
| 2026-02-09 12:00 |
06:37:03.39 |
+53:19:16.4 |
HIP 31640 |
9.42 |
| 2026-02-10 00:00 |
06:36:53.57 |
+53:18:50.7 |
HIP 31640 |
10.21 |
| 2026-02-10 12:00 |
06:36:43.86 |
+53:18:24.5 |
HIP 31640 |
11.15 |
| 2026-02-11 00:00 |
06:36:34.24 |
+53:17:57.9 |
HIP 31640 |
12.21 |
| 2026-02-11 12:00 |
06:36:24.73 |
+53:17:30.8 |
HIP 31640 |
13.35 |
| 2026-02-12 00:00 |
06:36:15.32 |
+53:17:03.2 |
HIP 31640 |
14.55 |
| 2026-02-12 12:00 |
06:36:06.01 |
+53:16:35.2 |
HIP 31640 |
15.80 |
| 2026-02-13 00:00 |
06:35:56.80 |
+53:16:06.7 |
HIP 31640 |
17.07 |
| 2026-02-13 12:00 |
06:35:47.70 |
+53:15:37.7 |
HIP 31640 |
18.36 |
| 2026-02-14 00:00 |
06:35:38.71 |
+53:15:08.3 |
HIP 31640 |
19.67 |
| 2026-02-14 12:00 |
06:35:29.82 |
+53:14:38.5 |
HIP 31640 |
20.99 |
| 2026-02-15 00:00 |
06:35:21.04 |
+53:14:08.2 |
HIP 31640 |
22.31 |
| 2026-02-15 12:00 |
06:35:12.37 |
+53:13:37.5 |
HIP 31432 |
21.79 |
| 2026-02-16 00:00 |
06:35:03.81 |
+53:13:06.4 |
HIP 31432 |
21.29 |
| 2026-02-16 12:00 |
06:34:55.36 |
+53:12:34.9 |
HIP 31432 |
20.86 |
| 2026-02-17 00:00 |
06:34:47.01 |
+53:12:03.0 |
HIP 31432 |
20.51 |
| 2026-02-17 12:00 |
06:34:38.78 |
+53:11:30.6 |
HIP 31432 |
20.23 |
| 2026-02-18 00:00 |
06:34:30.65 |
+53:10:57.9 |
HIP 31432 |
20.03 |
| 2026-02-18 12:00 |
06:34:22.64 |
+53:10:24.7 |
HIP 31432 |
19.90 |
| 2026-02-19 00:00 |
06:34:14.74 |
+53:09:51.2 |
HIP 31432 |
19.85 |
| 2026-02-19 12:00 |
06:34:06.96 |
+53:09:17.3 |
HIP 31432 |
19.88 |
| 2026-02-20 00:00 |
06:33:59.28 |
+53:08:43.0 |
HIP 31432 |
19.97 |
| 2026-02-20 12:00 |
06:33:51.72 |
+53:08:08.4 |
HIP 31432 |
20.13 |
| 2026-02-21 00:00 |
06:33:44.28 |
+53:07:33.4 |
HIP 31432 |
20.35 |
| 2026-02-21 12:00 |
06:33:36.95 |
+53:06:58.0 |
HIP 31432 |
20.64 |
| 2026-02-22 00:00 |
06:33:29.73 |
+53:06:22.3 |
HIP 31432 |
20.97 |
| 2026-02-22 12:00 |
06:33:22.63 |
+53:05:46.3 |
HIP 31432 |
21.36 |
| 2026-02-23 00:00 |
06:33:15.65 |
+53:05:09.9 |
HIP 31432 |
21.79 |
| 2026-02-23 12:00 |
06:33:08.78 |
+53:04:33.2 |
HIP 31432 |
22.27 |
| 2026-02-24 00:00 |
06:33:02.03 |
+53:03:56.1 |
HIP 31090 |
22.15 |