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) |
| 2026-03-26 00:00 |
06:29:53.93 |
+52:20:40.2 |
HIP 30869 |
11.51 |
| 2026-03-26 12:00 |
06:29:54.39 |
+52:19:54.1 |
HIP 30869 |
12.01 |
| 2026-03-27 00:00 |
06:29:54.96 |
+52:19:08.0 |
HIP 30869 |
12.54 |
| 2026-03-27 12:00 |
06:29:55.65 |
+52:18:21.9 |
HIP 30869 |
13.11 |
| 2026-03-28 00:00 |
06:29:56.45 |
+52:17:35.8 |
HIP 30869 |
13.72 |
| 2026-03-28 12:00 |
06:29:57.36 |
+52:16:49.7 |
HIP 30878 |
13.32 |
| 2026-03-29 00:00 |
06:29:58.38 |
+52:16:03.6 |
HIP 30878 |
12.92 |
| 2026-03-29 12:00 |
06:29:59.51 |
+52:15:17.6 |
HIP 30878 |
12.56 |
| 2026-03-30 00:00 |
06:30:00.75 |
+52:14:31.6 |
HIP 30878 |
12.26 |
| 2026-03-30 12:00 |
06:30:02.10 |
+52:13:45.7 |
HIP 30878 |
12.02 |
| 2026-03-31 00:00 |
06:30:03.56 |
+52:12:59.8 |
HIP 30878 |
11.84 |
| 2026-03-31 12:00 |
06:30:05.14 |
+52:12:13.9 |
HIP 30878 |
11.74 |
| 2026-04-01 00:00 |
06:30:06.82 |
+52:11:28.1 |
HIP 30878 |
11.70 |
| 2026-04-01 12:00 |
06:30:08.60 |
+52:10:42.3 |
HIP 30878 |
11.73 |
| 2026-04-02 00:00 |
06:30:10.50 |
+52:09:56.6 |
HIP 30878 |
11.83 |
| 2026-04-02 12:00 |
06:30:12.50 |
+52:09:11.0 |
HIP 30878 |
12.01 |
| 2026-04-03 00:00 |
06:30:14.62 |
+52:08:25.4 |
HIP 30878 |
12.26 |
| 2026-04-03 12:00 |
06:30:16.83 |
+52:07:39.9 |
HIP 30878 |
12.57 |
| 2026-04-04 00:00 |
06:30:19.16 |
+52:06:54.4 |
HIP 30878 |
12.94 |
| 2026-04-04 12:00 |
06:30:21.59 |
+52:06:09.1 |
HIP 30878 |
13.37 |
| 2026-04-05 00:00 |
06:30:24.12 |
+52:05:23.8 |
HIP 30878 |
13.86 |
| 2026-04-05 12:00 |
06:30:26.76 |
+52:04:38.6 |
HIP 30878 |
14.40 |
| 2026-04-06 00:00 |
06:30:29.50 |
+52:03:53.4 |
HIP 30878 |
14.98 |
| 2026-04-06 12:00 |
06:30:32.35 |
+52:03:08.4 |
HIP 30878 |
15.60 |
| 2026-04-07 00:00 |
06:30:35.30 |
+52:02:23.4 |
HIP 31027 |
15.64 |
| 2026-04-07 12:00 |
06:30:38.36 |
+52:01:38.6 |
HIP 31027 |
14.89 |
| 2026-04-08 00:00 |
06:30:41.52 |
+52:00:53.8 |
HIP 31027 |
14.16 |
| 2026-04-08 12:00 |
06:30:44.78 |
+52:00:09.1 |
HIP 31027 |
13.44 |
| 2026-04-09 00:00 |
06:30:48.14 |
+51:59:24.6 |
HIP 31027 |
12.76 |
| 2026-04-09 12:00 |
06:30:51.60 |
+51:58:40.1 |
HIP 31027 |
12.11 |
| 2026-04-10 00:00 |
06:30:55.17 |
+51:57:55.8 |
HIP 31027 |
11.50 |
| 2026-04-10 12:00 |
06:30:58.83 |
+51:57:11.5 |
HIP 31027 |
10.94 |
| 2026-04-11 00:00 |
06:31:02.60 |
+51:56:27.4 |
HIP 31027 |
10.44 |
| 2026-04-11 12:00 |
06:31:06.46 |
+51:55:43.4 |
HIP 31027 |
10.01 |
| 2026-04-12 00:00 |
06:31:10.43 |
+51:54:59.5 |
HIP 31027 |
9.67 |
| 2026-04-12 12:00 |
06:31:14.49 |
+51:54:15.8 |
HIP 31027 |
9.42 |
| 2026-04-13 00:00 |
06:31:18.65 |
+51:53:32.2 |
HIP 31027 |
9.28 |
| 2026-04-13 12:00 |
06:31:22.91 |
+51:52:48.7 |
HIP 31027 |
9.25 |
| 2026-04-14 00:00 |
06:31:27.27 |
+51:52:05.3 |
HIP 31027 |
9.34 |
| 2026-04-14 12:00 |
06:31:31.72 |
+51:51:22.1 |
HIP 31027 |
9.54 |
| 2026-04-15 00:00 |
06:31:36.27 |
+51:50:39.0 |
HIP 31027 |
9.86 |
| 2026-04-15 12:00 |
06:31:40.92 |
+51:49:56.1 |
HIP 31027 |
10.28 |
| 2026-04-16 00:00 |
06:31:45.66 |
+51:49:13.3 |
HIP 31027 |
10.80 |