メタデータ
| 項目 |
値 |
| Designation |
C/2020 K6 (Rankin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-09-15T13:36:00.020160Z |
| Orbit solution date (soln_date, UTC) |
2023-06-30T22:15:05Z |
| Obs used |
180 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
5.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-05-26T08:55:19.200000Z |
| Discovery magnitude (MPC) |
20.50 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-01-04.0000000 |
| e |
1.00320001 |
| q (au) |
5.868420 |
| a (au) |
-1833.877552 |
| i (deg) |
103.645272 |
| Ω (om, deg) |
291.528614 |
| ω (w, deg) |
44.307127 |
| M (ma, deg) |
0.001386 |
等級
散乱 + 全体線形
$$
M_a = (10.183 + 2.419\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.183 |
| n |
2.419 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
09:11:23.22 |
+62:11:43.0 |
HIP 45027 |
16.89 |
| 2026-03-26 12:00 |
09:11:06.48 |
+62:10:07.2 |
HIP 45200 |
17.46 |
| 2026-03-27 00:00 |
09:10:49.93 |
+62:08:30.6 |
HIP 45200 |
17.60 |
| 2026-03-27 12:00 |
09:10:33.57 |
+62:06:53.2 |
HIP 45200 |
18.07 |
| 2026-03-28 00:00 |
09:10:17.40 |
+62:05:15.1 |
HIP 45200 |
18.85 |
| 2026-03-28 12:00 |
09:10:01.42 |
+62:03:36.2 |
HIP 44849 |
18.33 |
| 2026-03-29 00:00 |
09:09:45.63 |
+62:01:56.6 |
HIP 44849 |
15.86 |
| 2026-03-29 12:00 |
09:09:30.02 |
+62:00:16.3 |
HIP 44849 |
13.39 |
| 2026-03-30 00:00 |
09:09:14.61 |
+61:58:35.3 |
HIP 44849 |
10.94 |
| 2026-03-30 12:00 |
09:08:59.39 |
+61:56:53.5 |
HIP 44849 |
8.50 |
| 2026-03-31 00:00 |
09:08:44.35 |
+61:55:11.0 |
HIP 44849 |
6.09 |
| 2026-03-31 12:00 |
09:08:29.51 |
+61:53:27.9 |
HIP 44849 |
3.73 |
| 2026-04-01 00:00 |
09:08:14.86 |
+61:51:44.1 |
HIP 44849 |
1.65 |
| 2026-04-01 12:00 |
09:08:00.40 |
+61:49:59.6 |
HIP 44849 |
1.85 |
| 2026-04-02 00:00 |
09:07:46.13 |
+61:48:14.5 |
HIP 44849 |
3.99 |
| 2026-04-02 12:00 |
09:07:32.05 |
+61:46:28.7 |
HIP 44849 |
6.33 |
| 2026-04-03 00:00 |
09:07:18.16 |
+61:44:42.3 |
HIP 44849 |
8.71 |
| 2026-04-03 12:00 |
09:07:04.46 |
+61:42:55.3 |
HIP 44849 |
11.09 |
| 2026-04-04 00:00 |
09:06:50.96 |
+61:41:07.7 |
HIP 44849 |
13.48 |
| 2026-04-04 12:00 |
09:06:37.64 |
+61:39:19.4 |
HIP 44849 |
15.86 |
| 2026-04-05 00:00 |
09:06:24.52 |
+61:37:30.6 |
HIP 44849 |
18.24 |
| 2026-04-05 12:00 |
09:06:11.59 |
+61:35:41.2 |
HIP 44849 |
20.61 |
| 2026-04-06 00:00 |
09:05:58.85 |
+61:33:51.2 |
HIP 44849 |
22.98 |
| 2026-04-06 12:00 |
09:05:46.30 |
+61:32:00.7 |
HIP 44399 |
22.25 |
| 2026-04-07 00:00 |
09:05:33.94 |
+61:30:09.6 |
HIP 44399 |
20.80 |
| 2026-04-07 12:00 |
09:05:21.77 |
+61:28:17.9 |
HIP 44399 |
19.56 |
| 2026-04-08 00:00 |
09:05:09.80 |
+61:26:25.8 |
HIP 44399 |
18.55 |
| 2026-04-08 12:00 |
09:04:58.01 |
+61:24:33.1 |
HIP 44399 |
17.82 |
| 2026-04-09 00:00 |
09:04:46.42 |
+61:22:39.9 |
HIP 44399 |
17.40 |
| 2026-04-09 12:00 |
09:04:35.01 |
+61:20:46.2 |
HIP 44399 |
17.31 |
| 2026-04-10 00:00 |
09:04:23.80 |
+61:18:52.0 |
HIP 44399 |
17.55 |
| 2026-04-10 12:00 |
09:04:12.78 |
+61:16:57.3 |
HIP 44557 |
17.86 |
| 2026-04-11 00:00 |
09:04:01.95 |
+61:15:02.1 |
HIP 44557 |
16.32 |
| 2026-04-11 12:00 |
09:03:51.31 |
+61:13:06.5 |
HIP 44557 |
14.97 |
| 2026-04-12 00:00 |
09:03:40.86 |
+61:11:10.4 |
HIP 44557 |
13.87 |
| 2026-04-12 12:00 |
09:03:30.59 |
+61:09:13.9 |
HIP 44557 |
13.06 |
| 2026-04-13 00:00 |
09:03:20.52 |
+61:07:17.0 |
HIP 44557 |
12.60 |
| 2026-04-13 12:00 |
09:03:10.64 |
+61:05:19.6 |
HIP 44557 |
12.54 |
| 2026-04-14 00:00 |
09:03:00.94 |
+61:03:21.8 |
HIP 44557 |
12.87 |
| 2026-04-14 12:00 |
09:02:51.44 |
+61:01:23.6 |
HIP 44557 |
13.56 |
| 2026-04-15 00:00 |
09:02:42.12 |
+60:59:25.1 |
HIP 44557 |
14.55 |
| 2026-04-15 12:00 |
09:02:32.99 |
+60:57:26.1 |
HIP 44557 |
15.80 |
| 2026-04-16 00:00 |
09:02:24.05 |
+60:55:26.7 |
HIP 44557 |
17.23 |