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 · 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) |
| 2026-03-26 00:00 |
16:19:20.19 |
+06:59:27.0 |
HIP 79901 |
19.77 |
| 2026-03-26 12:00 |
16:19:17.19 |
+07:00:19.8 |
HIP 79901 |
18.62 |
| 2026-03-27 00:00 |
16:19:14.13 |
+07:01:12.4 |
HIP 79901 |
17.47 |
| 2026-03-27 12:00 |
16:19:11.02 |
+07:02:05.0 |
HIP 79901 |
16.31 |
| 2026-03-28 00:00 |
16:19:07.85 |
+07:02:57.5 |
HIP 79901 |
15.15 |
| 2026-03-28 12:00 |
16:19:04.63 |
+07:03:49.9 |
HIP 79901 |
13.98 |
| 2026-03-29 00:00 |
16:19:01.36 |
+07:04:42.2 |
HIP 79901 |
12.81 |
| 2026-03-29 12:00 |
16:18:58.03 |
+07:05:34.4 |
HIP 79901 |
11.64 |
| 2026-03-30 00:00 |
16:18:54.65 |
+07:06:26.5 |
HIP 79901 |
10.47 |
| 2026-03-30 12:00 |
16:18:51.22 |
+07:07:18.5 |
HIP 79901 |
9.31 |
| 2026-03-31 00:00 |
16:18:47.73 |
+07:08:10.5 |
HIP 79901 |
8.16 |
| 2026-03-31 12:00 |
16:18:44.19 |
+07:09:02.3 |
HIP 79901 |
7.02 |
| 2026-04-01 00:00 |
16:18:40.60 |
+07:09:53.9 |
HIP 79901 |
5.93 |
| 2026-04-01 12:00 |
16:18:36.96 |
+07:10:45.5 |
HIP 79901 |
4.91 |
| 2026-04-02 00:00 |
16:18:33.27 |
+07:11:37.0 |
HIP 79901 |
4.02 |
| 2026-04-02 12:00 |
16:18:29.53 |
+07:12:28.3 |
HIP 79901 |
3.38 |
| 2026-04-03 00:00 |
16:18:25.73 |
+07:13:19.5 |
HIP 79901 |
3.15 |
| 2026-04-03 12:00 |
16:18:21.89 |
+07:14:10.5 |
HIP 79901 |
3.42 |
| 2026-04-04 00:00 |
16:18:17.99 |
+07:15:01.5 |
HIP 79901 |
4.11 |
| 2026-04-04 12:00 |
16:18:14.05 |
+07:15:52.2 |
HIP 79901 |
5.05 |
| 2026-04-05 00:00 |
16:18:10.05 |
+07:16:42.9 |
HIP 79901 |
6.13 |
| 2026-04-05 12:00 |
16:18:06.01 |
+07:17:33.3 |
HIP 79901 |
7.30 |
| 2026-04-06 00:00 |
16:18:01.92 |
+07:18:23.7 |
HIP 79901 |
8.51 |
| 2026-04-06 12:00 |
16:17:57.78 |
+07:19:13.8 |
HIP 79901 |
9.77 |
| 2026-04-07 00:00 |
16:17:53.59 |
+07:20:03.8 |
HIP 79901 |
11.05 |
| 2026-04-07 12:00 |
16:17:49.35 |
+07:20:53.7 |
HIP 79901 |
12.35 |
| 2026-04-08 00:00 |
16:17:45.07 |
+07:21:43.4 |
HIP 79901 |
13.66 |
| 2026-04-08 12:00 |
16:17:40.73 |
+07:22:32.8 |
HIP 79901 |
15.00 |
| 2026-04-09 00:00 |
16:17:36.36 |
+07:23:22.2 |
HIP 79901 |
16.34 |
| 2026-04-09 12:00 |
16:17:31.93 |
+07:24:11.3 |
HIP 79792 |
16.89 |
| 2026-04-10 00:00 |
16:17:27.46 |
+07:25:00.2 |
HIP 79792 |
17.17 |
| 2026-04-10 12:00 |
16:17:22.94 |
+07:25:49.0 |
HIP 79792 |
17.55 |
| 2026-04-11 00:00 |
16:17:18.38 |
+07:26:37.5 |
HIP 79827 |
18.01 |
| 2026-04-11 12:00 |
16:17:13.77 |
+07:27:25.9 |
HIP 79752 |
16.85 |
| 2026-04-12 00:00 |
16:17:09.12 |
+07:28:14.0 |
HIP 79752 |
15.59 |
| 2026-04-12 12:00 |
16:17:04.42 |
+07:29:02.0 |
HIP 79752 |
14.35 |
| 2026-04-13 00:00 |
16:16:59.68 |
+07:29:49.7 |
HIP 79752 |
13.14 |
| 2026-04-13 12:00 |
16:16:54.90 |
+07:30:37.2 |
HIP 79752 |
11.98 |
| 2026-04-14 00:00 |
16:16:50.07 |
+07:31:24.5 |
HIP 79752 |
10.89 |
| 2026-04-14 12:00 |
16:16:45.20 |
+07:32:11.6 |
HIP 79752 |
9.88 |
| 2026-04-15 00:00 |
16:16:40.29 |
+07:32:58.4 |
HIP 79752 |
9.00 |
| 2026-04-15 12:00 |
16:16:35.34 |
+07:33:45.0 |
HIP 79752 |
8.28 |
| 2026-04-16 00:00 |
16:16:30.34 |
+07:34:31.3 |
HIP 79752 |
7.77 |