C/2020 K1 (PANSTARRS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2020 K1 (PANSTARRS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2023-05-09T01:41:32.504640Z |
| Orbit solution date (soln_date, UTC) | 2026-03-07T11:42:49Z |
| Obs used | 3655 |
| NEO | - |
| M1 | 8.600 |
| K1 | 6.000 |
| PC | - |
| Discovery observation (MPC, UTC) | 2020-05-17T12:17:42.374400Z |
| Discovery magnitude (MPC) | 20.62 w |
| Discovery observatory (MPC) | F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2022-07-31.0000000 |
| e | 0.99993441 |
| q (au) | 3.073431 |
| a (au) | 46857.294566 |
| i (deg) | 89.664146 |
| Ω (om, deg) | 94.355504 |
| ω (w, deg) | 213.979196 |
| M (ma, deg) | 359.999973 |
等級
散乱 + 全体線形
$$ M_a = (9.622 + 3.289\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 9.622 |
| n | 3.289 |
| gf | 0.997 |
| gb | -0.751 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) | 終了日 (UTC) | a | b |
|---|---|---|---|
| 2020-04-17 | 2022-05-11 | +3.0007 | -2.432 |
| 2022-05-11 | 2022-08-27 | +3.0053 | -2.081 |
| 2022-08-27 | 2023-05-09 | -4.1542 | +1.858 |
| 2023-05-09 | 2024-01-03 | +2.1752 | -0.961 |
| 2024-01-03 | 2025-03-10 | +0.3984 | -0.333 |
| 2025-03-10 | 2026-01-22 | +12.4062 | -10.407 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 06:25:42.52 | -07:13:07.4 | HIP 30633 | 11.45 |
| 2026-07-29 12:00 | 06:25:51.75 | -07:13:16.4 | HIP 30633 | 9.95 |
| 2026-07-30 00:00 | 06:26:00.94 | -07:13:25.9 | HIP 30633 | 8.80 |
| 2026-07-30 12:00 | 06:26:10.07 | -07:13:36.0 | HIP 30633 | 8.12 |
| 2026-07-31 00:00 | 06:26:19.17 | -07:13:46.6 | HIP 30633 | 8.05 |
| 2026-07-31 12:00 | 06:26:28.21 | -07:13:57.8 | HIP 30633 | 8.58 |
| 2026-08-01 00:00 | 06:26:37.21 | -07:14:09.5 | HIP 30633 | 9.60 |
| 2026-08-01 12:00 | 06:26:46.16 | -07:14:21.7 | HIP 30633 | 10.98 |
| 2026-08-02 00:00 | 06:26:55.06 | -07:14:34.6 | HIP 30633 | 12.59 |
| 2026-08-02 12:00 | 06:27:03.92 | -07:14:47.9 | HIP 30633 | 14.34 |
| 2026-08-03 00:00 | 06:27:12.72 | -07:15:01.8 | HIP 30633 | 16.20 |
| 2026-08-03 12:00 | 06:27:21.47 | -07:15:16.2 | HIP 30675 | 17.92 |
| 2026-08-04 00:00 | 06:27:30.18 | -07:15:31.2 | HIP 30675 | 18.90 |
| 2026-08-04 12:00 | 06:27:38.83 | -07:15:46.7 | HIP 30675 | 20.06 |
| 2026-08-05 00:00 | 06:27:47.43 | -07:16:02.7 | HIP 30867 | 20.77 |
| 2026-08-05 12:00 | 06:27:55.99 | -07:16:19.3 | HIP 30867 | 19.47 |
| 2026-08-06 00:00 | 06:28:04.48 | -07:16:36.3 | HIP 30867 | 18.33 |
| 2026-08-06 12:00 | 06:28:12.93 | -07:16:53.9 | HIP 30867 | 17.40 |
| 2026-08-07 00:00 | 06:28:21.32 | -07:17:12.0 | HIP 30867 | 16.70 |
| 2026-08-07 12:00 | 06:28:29.66 | -07:17:30.7 | HIP 30867 | 16.26 |
| 2026-08-08 00:00 | 06:28:37.94 | -07:17:49.8 | HIP 30935 | 14.31 |
| 2026-08-08 12:00 | 06:28:46.17 | -07:18:09.4 | HIP 30935 | 12.26 |
| 2026-08-09 00:00 | 06:28:54.34 | -07:18:29.6 | HIP 30935 | 10.23 |
| 2026-08-09 12:00 | 06:29:02.46 | -07:18:50.3 | HIP 30935 | 8.22 |
| 2026-08-10 00:00 | 06:29:10.52 | -07:19:11.4 | HIP 30935 | 6.23 |
| 2026-08-10 12:00 | 06:29:18.52 | -07:19:33.1 | HIP 30935 | 4.31 |
| 2026-08-11 00:00 | 06:29:26.47 | -07:19:55.2 | HIP 30935 | 2.52 |
| 2026-08-11 12:00 | 06:29:34.35 | -07:20:17.8 | HIP 30935 | 1.48 |
| 2026-08-12 00:00 | 06:29:42.18 | -07:20:40.9 | HIP 30935 | 2.42 |
| 2026-08-12 12:00 | 06:29:49.94 | -07:21:04.5 | HIP 30935 | 4.15 |
| 2026-08-13 00:00 | 06:29:57.65 | -07:21:28.6 | HIP 30935 | 6.01 |
| 2026-08-13 12:00 | 06:30:05.29 | -07:21:53.1 | HIP 30935 | 7.90 |
| 2026-08-14 00:00 | 06:30:12.88 | -07:22:18.1 | HIP 30935 | 9.80 |
| 2026-08-14 12:00 | 06:30:20.40 | -07:22:43.6 | HIP 30935 | 11.68 |
| 2026-08-15 00:00 | 06:30:27.86 | -07:23:09.6 | HIP 30935 | 13.57 |
| 2026-08-15 12:00 | 06:30:35.26 | -07:23:35.9 | HIP 30935 | 15.44 |
| 2026-08-16 00:00 | 06:30:42.59 | -07:24:02.8 | HIP 30935 | 17.30 |
| 2026-08-16 12:00 | 06:30:49.86 | -07:24:30.1 | HIP 30935 | 19.14 |
| 2026-08-17 00:00 | 06:30:57.06 | -07:24:57.8 | HIP 31152 | 19.37 |
| 2026-08-17 12:00 | 06:31:04.20 | -07:25:26.0 | HIP 31152 | 17.62 |
| 2026-08-18 00:00 | 06:31:11.27 | -07:25:54.6 | HIP 31152 | 15.90 |
| 2026-08-18 12:00 | 06:31:18.28 | -07:26:23.6 | HIP 31152 | 14.23 |
| 2026-08-19 00:00 | 06:31:25.22 | -07:26:53.0 | HIP 31152 | 12.61 |