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) |
| 2026-05-12 00:00 |
08:58:40.40 |
+59:07:09.4 |
HIP 44198 |
14.34 |
| 2026-05-12 12:00 |
08:58:40.35 |
+59:05:02.6 |
HIP 44198 |
15.66 |
| 2026-05-13 00:00 |
08:58:40.44 |
+59:02:55.8 |
HIP 44198 |
17.13 |
| 2026-05-13 12:00 |
08:58:40.68 |
+59:00:49.1 |
HIP 44198 |
18.72 |
| 2026-05-14 00:00 |
08:58:41.06 |
+58:58:42.5 |
HIP 44198 |
20.38 |
| 2026-05-14 12:00 |
08:58:41.58 |
+58:56:35.9 |
HIP 44198 |
22.11 |
| 2026-05-15 00:00 |
08:58:42.24 |
+58:54:29.4 |
HIP 44198 |
23.90 |
| 2026-05-15 12:00 |
08:58:43.05 |
+58:52:23.0 |
HIP 44198 |
25.72 |
| 2026-05-16 00:00 |
08:58:43.99 |
+58:50:16.7 |
HIP 44198 |
27.57 |
| 2026-05-16 12:00 |
08:58:45.07 |
+58:48:10.5 |
HIP 44198 |
29.45 |
| 2026-05-17 00:00 |
08:58:46.29 |
+58:46:04.3 |
HIP 44198 |
31.36 |
| 2026-05-17 12:00 |
08:58:47.64 |
+58:43:58.3 |
HIP 43984 |
32.67 |
| 2026-05-18 00:00 |
08:58:49.13 |
+58:41:52.4 |
HIP 43984 |
30.77 |
| 2026-05-18 12:00 |
08:58:50.76 |
+58:39:46.6 |
HIP 43984 |
28.91 |
| 2026-05-19 00:00 |
08:58:52.51 |
+58:37:41.0 |
HIP 43984 |
27.09 |
| 2026-05-19 12:00 |
08:58:54.40 |
+58:35:35.5 |
HIP 43984 |
25.32 |
| 2026-05-20 00:00 |
08:58:56.42 |
+58:33:30.1 |
HIP 43984 |
23.62 |
| 2026-05-20 12:00 |
08:58:58.57 |
+58:31:24.9 |
HIP 43984 |
22.01 |
| 2026-05-21 00:00 |
08:59:00.85 |
+58:29:19.8 |
HIP 43984 |
20.49 |
| 2026-05-21 12:00 |
08:59:03.26 |
+58:27:14.9 |
HIP 43984 |
19.11 |
| 2026-05-22 00:00 |
08:59:05.79 |
+58:25:10.1 |
HIP 43984 |
17.87 |
| 2026-05-22 12:00 |
08:59:08.45 |
+58:23:05.5 |
HIP 43984 |
16.83 |
| 2026-05-23 00:00 |
08:59:11.24 |
+58:21:01.1 |
HIP 43984 |
16.02 |
| 2026-05-23 12:00 |
08:59:14.15 |
+58:18:56.9 |
HIP 43984 |
15.46 |
| 2026-05-24 00:00 |
08:59:17.17 |
+58:16:52.8 |
HIP 43984 |
15.20 |
| 2026-05-24 12:00 |
08:59:20.33 |
+58:14:49.0 |
HIP 43984 |
15.25 |
| 2026-05-25 00:00 |
08:59:23.60 |
+58:12:45.3 |
HIP 43984 |
15.60 |
| 2026-05-25 12:00 |
08:59:26.99 |
+58:10:41.8 |
HIP 43984 |
16.23 |
| 2026-05-26 00:00 |
08:59:30.50 |
+58:08:38.5 |
HIP 43984 |
17.11 |
| 2026-05-26 12:00 |
08:59:34.12 |
+58:06:35.5 |
HIP 43984 |
18.21 |
| 2026-05-27 00:00 |
08:59:37.86 |
+58:04:32.6 |
HIP 43984 |
19.50 |
| 2026-05-27 12:00 |
08:59:41.72 |
+58:02:30.0 |
HIP 43984 |
20.92 |
| 2026-05-28 00:00 |
08:59:45.69 |
+58:00:27.6 |
HIP 43984 |
22.47 |
| 2026-05-28 12:00 |
08:59:49.77 |
+57:58:25.4 |
HIP 43984 |
24.11 |
| 2026-05-29 00:00 |
08:59:53.97 |
+57:56:23.4 |
HIP 43984 |
25.82 |
| 2026-05-29 12:00 |
08:59:58.28 |
+57:54:21.7 |
HIP 43984 |
27.60 |
| 2026-05-30 00:00 |
09:00:02.70 |
+57:52:20.2 |
HIP 43984 |
29.44 |
| 2026-05-30 12:00 |
09:00:07.22 |
+57:50:18.9 |
HIP 43984 |
31.31 |
| 2026-05-31 00:00 |
09:00:11.86 |
+57:48:17.9 |
HIP 43984 |
33.22 |
| 2026-05-31 12:00 |
09:00:16.60 |
+57:46:17.2 |
HIP 43984 |
35.16 |
| 2026-06-01 00:00 |
09:00:21.45 |
+57:44:16.6 |
HIP 43984 |
37.12 |
| 2026-06-01 12:00 |
09:00:26.40 |
+57:42:16.4 |
HIP 44492 |
35.53 |
| 2026-06-02 00:00 |
09:00:31.46 |
+57:40:16.4 |
HIP 44492 |
33.78 |