メタデータ
| 項目 |
値 |
| Designation |
P/2020 K9 (Lemmon-PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-02-11T15:05:58.525440Z |
| Orbit solution date (soln_date, UTC) |
2021-05-31T22:43:04Z |
| Obs used |
133 |
| NEO |
- |
| M1 |
15.600 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-05-22T10:22:34.176000Z |
| Discovery magnitude (MPC) |
20.50 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-08-21.0000000 |
| e |
0.32212437 |
| q (au) |
2.849537 |
| a (au) |
4.203629 |
| i (deg) |
23.202607 |
| Ω (om, deg) |
166.242195 |
| ω (w, deg) |
196.834702 |
| M (ma, deg) |
340.029714 |
等級
散乱 + 全体線形
$$
M_a = (14.360 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.360 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.500 |
| k |
1.000 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
13:56:53.30 |
+03:35:46.3 |
HIP 67978 |
30.96 |
| 2026-09-20 12:00 |
13:57:15.68 |
+03:33:34.8 |
HIP 67978 |
34.37 |
| 2026-09-21 00:00 |
13:57:38.12 |
+03:31:23.5 |
HIP 68110 |
35.25 |
| 2026-09-21 12:00 |
13:58:00.62 |
+03:29:12.4 |
HIP 68386 |
30.18 |
| 2026-09-22 00:00 |
13:58:23.18 |
+03:27:01.4 |
HIP 68386 |
24.18 |
| 2026-09-22 12:00 |
13:58:45.81 |
+03:24:50.7 |
HIP 68386 |
18.21 |
| 2026-09-23 00:00 |
13:59:08.50 |
+03:22:40.1 |
HIP 68386 |
12.29 |
| 2026-09-23 12:00 |
13:59:31.25 |
+03:20:29.8 |
HIP 68386 |
6.63 |
| 2026-09-24 00:00 |
13:59:54.06 |
+03:18:19.6 |
HIP 68386 |
3.26 |
| 2026-09-24 12:00 |
14:00:16.94 |
+03:16:09.7 |
HIP 68386 |
7.19 |
| 2026-09-25 00:00 |
14:00:39.87 |
+03:14:00.0 |
HIP 68386 |
12.95 |
| 2026-09-25 12:00 |
14:01:02.86 |
+03:11:50.5 |
HIP 68386 |
18.94 |
| 2026-09-26 00:00 |
14:01:25.91 |
+03:09:41.2 |
HIP 68386 |
25.02 |
| 2026-09-26 12:00 |
14:01:49.02 |
+03:07:32.1 |
HIP 68525 |
26.23 |
| 2026-09-27 00:00 |
14:02:12.18 |
+03:05:23.3 |
HIP 68525 |
25.06 |
| 2026-09-27 12:00 |
14:02:35.40 |
+03:03:14.8 |
HIP 68525 |
25.40 |
| 2026-09-28 00:00 |
14:02:58.68 |
+03:01:06.5 |
HIP 68525 |
27.18 |
| 2026-09-28 12:00 |
14:03:22.02 |
+02:58:58.4 |
HIP 68747 |
26.69 |
| 2026-09-29 00:00 |
14:03:45.41 |
+02:56:50.6 |
HIP 68747 |
22.09 |
| 2026-09-29 12:00 |
14:04:08.86 |
+02:54:43.0 |
HIP 68747 |
18.45 |
| 2026-09-30 00:00 |
14:04:32.36 |
+02:52:35.7 |
HIP 68747 |
16.47 |
| 2026-09-30 12:00 |
14:04:55.91 |
+02:50:28.7 |
HIP 68747 |
16.73 |
| 2026-10-01 00:00 |
14:05:19.52 |
+02:48:21.9 |
HIP 68747 |
19.17 |
| 2026-10-01 12:00 |
14:05:43.18 |
+02:46:15.4 |
HIP 68747 |
23.11 |
| 2026-10-02 00:00 |
14:06:06.90 |
+02:44:09.2 |
HIP 68747 |
27.93 |
| 2026-10-02 12:00 |
14:06:30.67 |
+02:42:03.3 |
HIP 68889 |
32.25 |
| 2026-10-03 00:00 |
14:06:54.49 |
+02:39:57.7 |
HIP 68889 |
35.38 |
| 2026-10-03 12:00 |
14:07:18.36 |
+02:37:52.4 |
HIP 69165 |
33.91 |
| 2026-10-04 00:00 |
14:07:42.28 |
+02:35:47.4 |
HIP 69165 |
29.05 |
| 2026-10-04 12:00 |
14:08:06.25 |
+02:33:42.7 |
HIP 69165 |
24.86 |
| 2026-10-05 00:00 |
14:08:30.27 |
+02:31:38.3 |
HIP 69165 |
21.72 |
| 2026-10-05 12:00 |
14:08:54.35 |
+02:29:34.2 |
HIP 69165 |
20.14 |
| 2026-10-06 00:00 |
14:09:18.47 |
+02:27:30.5 |
HIP 69165 |
20.49 |
| 2026-10-06 12:00 |
14:09:42.63 |
+02:25:27.1 |
HIP 69165 |
22.70 |
| 2026-10-07 00:00 |
14:10:06.85 |
+02:23:24.0 |
HIP 69310 |
20.04 |
| 2026-10-07 12:00 |
14:10:31.11 |
+02:21:21.3 |
HIP 69310 |
14.04 |
| 2026-10-08 00:00 |
14:10:55.42 |
+02:19:18.9 |
HIP 69310 |
8.63 |
| 2026-10-08 12:00 |
14:11:19.78 |
+02:17:16.9 |
HIP 69310 |
5.84 |
| 2026-10-09 00:00 |
14:11:44.18 |
+02:15:15.2 |
HIP 69310 |
8.73 |
| 2026-10-09 12:00 |
14:12:08.62 |
+02:13:14.0 |
HIP 69389 |
11.48 |
| 2026-10-10 00:00 |
14:12:33.11 |
+02:11:13.1 |
HIP 69389 |
14.03 |
| 2026-10-10 12:00 |
14:12:57.64 |
+02:09:12.5 |
HIP 69389 |
18.57 |
| 2026-10-11 00:00 |
14:13:22.21 |
+02:07:12.4 |
HIP 69389 |
24.01 |