メタデータ
| 項目 |
値 |
| Designation |
C/2020 K8 (Catalina-ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-09-14T12:27:51.762240Z |
| Orbit solution date (soln_date, UTC) |
2021-05-31T22:42:54Z |
| Obs used |
291 |
| NEO |
- |
| M1 |
16.800 |
| K1 |
4.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-05-25T10:25:18.336000Z |
| Discovery magnitude (MPC) |
19.30 G |
| Discovery observatory (MPC) |
703 · University of Arizona Catalina Sky Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-07-13.0000000 |
| e |
1.00015223 |
| q (au) |
0.474575 |
| a (au) |
-3117.411049 |
| i (deg) |
31.413950 |
| Ω (om, deg) |
181.516792 |
| ω (w, deg) |
260.064417 |
| M (ma, deg) |
-0.000360 |
等級
散乱 + 全体線形
$$
M_a = (17.114 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.114 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.706 |
| 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) |
| 2026-06-01 00:00 |
16:07:04.03 |
+08:21:14.1 |
HIP 78924 |
5.94 |
| 2026-06-01 12:00 |
16:06:57.53 |
+08:21:25.2 |
HIP 78924 |
4.38 |
| 2026-06-02 00:00 |
16:06:51.03 |
+08:21:35.8 |
HIP 78924 |
2.90 |
| 2026-06-02 12:00 |
16:06:44.55 |
+08:21:45.9 |
HIP 78924 |
1.70 |
| 2026-06-03 00:00 |
16:06:38.08 |
+08:21:55.6 |
HIP 78924 |
1.60 |
| 2026-06-03 12:00 |
16:06:31.63 |
+08:22:04.9 |
HIP 78924 |
2.73 |
| 2026-06-04 00:00 |
16:06:25.18 |
+08:22:13.6 |
HIP 78924 |
4.17 |
| 2026-06-04 12:00 |
16:06:18.75 |
+08:22:22.0 |
HIP 78924 |
5.70 |
| 2026-06-05 00:00 |
16:06:12.33 |
+08:22:29.8 |
HIP 78924 |
7.26 |
| 2026-06-05 12:00 |
16:06:05.93 |
+08:22:37.2 |
HIP 78924 |
8.82 |
| 2026-06-06 00:00 |
16:05:59.54 |
+08:22:44.1 |
HIP 78924 |
10.39 |
| 2026-06-06 12:00 |
16:05:53.16 |
+08:22:50.6 |
HIP 78924 |
11.96 |
| 2026-06-07 00:00 |
16:05:46.81 |
+08:22:56.6 |
HIP 78924 |
13.53 |
| 2026-06-07 12:00 |
16:05:40.46 |
+08:23:02.1 |
HIP 78924 |
15.10 |
| 2026-06-08 00:00 |
16:05:34.14 |
+08:23:07.2 |
HIP 78924 |
16.66 |
| 2026-06-08 12:00 |
16:05:27.83 |
+08:23:11.8 |
HIP 78840 |
17.60 |
| 2026-06-09 00:00 |
16:05:21.54 |
+08:23:15.9 |
HIP 78840 |
17.95 |
| 2026-06-09 12:00 |
16:05:15.27 |
+08:23:19.6 |
HIP 78840 |
18.43 |
| 2026-06-10 00:00 |
16:05:09.01 |
+08:23:22.8 |
HIP 78840 |
19.00 |
| 2026-06-10 12:00 |
16:05:02.78 |
+08:23:25.5 |
HIP 78840 |
19.68 |
| 2026-06-11 00:00 |
16:04:56.57 |
+08:23:27.8 |
HIP 78718 |
18.89 |
| 2026-06-11 12:00 |
16:04:50.37 |
+08:23:29.6 |
HIP 78693 |
17.70 |
| 2026-06-12 00:00 |
16:04:44.20 |
+08:23:31.0 |
HIP 78693 |
16.46 |
| 2026-06-12 12:00 |
16:04:38.05 |
+08:23:31.9 |
HIP 78693 |
15.27 |
| 2026-06-13 00:00 |
16:04:31.92 |
+08:23:32.3 |
HIP 78693 |
14.14 |
| 2026-06-13 12:00 |
16:04:25.82 |
+08:23:32.2 |
HIP 78693 |
13.09 |
| 2026-06-14 00:00 |
16:04:19.73 |
+08:23:31.7 |
HIP 78693 |
12.13 |
| 2026-06-14 12:00 |
16:04:13.68 |
+08:23:30.8 |
HIP 78693 |
11.29 |
| 2026-06-15 00:00 |
16:04:07.64 |
+08:23:29.3 |
HIP 78693 |
10.59 |
| 2026-06-15 12:00 |
16:04:01.63 |
+08:23:27.4 |
HIP 78693 |
10.05 |
| 2026-06-16 00:00 |
16:03:55.65 |
+08:23:25.1 |
HIP 78693 |
9.71 |
| 2026-06-16 12:00 |
16:03:49.69 |
+08:23:22.3 |
HIP 78693 |
9.59 |
| 2026-06-17 00:00 |
16:03:43.76 |
+08:23:19.0 |
HIP 78693 |
9.67 |
| 2026-06-17 12:00 |
16:03:37.86 |
+08:23:15.3 |
HIP 78693 |
9.97 |
| 2026-06-18 00:00 |
16:03:31.98 |
+08:23:11.1 |
HIP 78693 |
10.46 |
| 2026-06-18 12:00 |
16:03:26.13 |
+08:23:06.4 |
HIP 78693 |
11.10 |
| 2026-06-19 00:00 |
16:03:20.31 |
+08:23:01.3 |
HIP 78693 |
11.88 |
| 2026-06-19 12:00 |
16:03:14.52 |
+08:22:55.8 |
HIP 78693 |
12.76 |
| 2026-06-20 00:00 |
16:03:08.76 |
+08:22:49.8 |
HIP 78693 |
13.73 |
| 2026-06-20 12:00 |
16:03:03.03 |
+08:22:43.3 |
HIP 78693 |
14.76 |
| 2026-06-21 00:00 |
16:02:57.33 |
+08:22:36.4 |
HIP 78693 |
15.84 |
| 2026-06-21 12:00 |
16:02:51.66 |
+08:22:29.1 |
HIP 78693 |
16.96 |
| 2026-06-22 00:00 |
16:02:46.02 |
+08:22:21.3 |
HIP 78693 |
18.11 |