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) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 06:05:09.26 | -08:09:31.8 | HIP 28833 | 8.19 |
| 2026-06-01 12:00 | 06:05:20.01 | -08:08:21.4 | HIP 28833 | 7.46 |
| 2026-06-02 00:00 | 06:05:30.77 | -08:07:11.8 | HIP 28833 | 7.82 |
| 2026-06-02 12:00 | 06:05:41.56 | -08:06:02.9 | HIP 28833 | 9.16 |
| 2026-06-03 00:00 | 06:05:52.36 | -08:04:54.8 | HIP 28833 | 11.12 |
| 2026-06-03 12:00 | 06:06:03.19 | -08:03:47.4 | HIP 28833 | 13.44 |
| 2026-06-04 00:00 | 06:06:14.03 | -08:02:40.8 | HIP 28833 | 15.96 |
| 2026-06-04 12:00 | 06:06:24.89 | -08:01:34.9 | HIP 28833 | 18.59 |
| 2026-06-05 00:00 | 06:06:35.76 | -08:00:29.8 | HIP 28833 | 21.30 |
| 2026-06-05 12:00 | 06:06:46.65 | -07:59:25.4 | HIP 28833 | 24.05 |
| 2026-06-06 00:00 | 06:06:57.56 | -07:58:21.8 | HIP 28833 | 26.84 |
| 2026-06-06 12:00 | 06:07:08.48 | -07:57:18.9 | HIP 29135 | 24.10 |
| 2026-06-07 00:00 | 06:07:19.42 | -07:56:16.8 | HIP 29135 | 21.36 |
| 2026-06-07 12:00 | 06:07:30.37 | -07:55:15.4 | HIP 29135 | 18.68 |
| 2026-06-08 00:00 | 06:07:41.33 | -07:54:14.8 | HIP 29135 | 16.05 |
| 2026-06-08 12:00 | 06:07:52.31 | -07:53:14.9 | HIP 29135 | 13.54 |
| 2026-06-09 00:00 | 06:08:03.30 | -07:52:15.8 | HIP 29135 | 11.21 |
| 2026-06-09 12:00 | 06:08:14.30 | -07:51:17.4 | HIP 29135 | 9.18 |
| 2026-06-10 00:00 | 06:08:25.31 | -07:50:19.8 | HIP 29135 | 7.73 |
| 2026-06-10 12:00 | 06:08:36.33 | -07:49:22.9 | HIP 29135 | 7.18 |
| 2026-06-11 00:00 | 06:08:47.36 | -07:48:26.8 | HIP 29135 | 7.74 |
| 2026-06-11 12:00 | 06:08:58.40 | -07:47:31.4 | HIP 29135 | 9.21 |
| 2026-06-12 00:00 | 06:09:09.45 | -07:46:36.8 | HIP 29135 | 11.23 |
| 2026-06-12 12:00 | 06:09:20.51 | -07:45:42.9 | HIP 29135 | 13.56 |
| 2026-06-13 00:00 | 06:09:31.58 | -07:44:49.7 | HIP 29135 | 16.06 |
| 2026-06-13 12:00 | 06:09:42.65 | -07:43:57.3 | HIP 29135 | 18.66 |
| 2026-06-14 00:00 | 06:09:53.73 | -07:43:05.7 | HIP 29240 | 18.28 |
| 2026-06-14 12:00 | 06:10:04.81 | -07:42:14.8 | HIP 29240 | 17.58 |
| 2026-06-15 00:00 | 06:10:15.90 | -07:41:24.6 | HIP 29240 | 17.35 |
| 2026-06-15 12:00 | 06:10:27.00 | -07:40:35.2 | HIP 29240 | 17.60 |
| 2026-06-16 00:00 | 06:10:38.09 | -07:39:46.5 | HIP 29240 | 18.31 |
| 2026-06-16 12:00 | 06:10:49.19 | -07:38:58.6 | HIP 29240 | 19.43 |
| 2026-06-17 00:00 | 06:11:00.29 | -07:38:11.4 | HIP 29240 | 20.90 |
| 2026-06-17 12:00 | 06:11:11.40 | -07:37:24.9 | HIP 29327 | 20.49 |
| 2026-06-18 00:00 | 06:11:22.50 | -07:36:39.2 | HIP 29327 | 20.23 |
| 2026-06-18 12:00 | 06:11:33.61 | -07:35:54.2 | HIP 29327 | 20.39 |
| 2026-06-19 00:00 | 06:11:44.71 | -07:35:09.9 | HIP 29327 | 20.95 |
| 2026-06-19 12:00 | 06:11:55.81 | -07:34:26.4 | HIP 29521 | 19.60 |
| 2026-06-20 00:00 | 06:12:06.91 | -07:33:43.6 | HIP 29521 | 16.78 |
| 2026-06-20 12:00 | 06:12:18.01 | -07:33:01.5 | HIP 29521 | 13.97 |
| 2026-06-21 00:00 | 06:12:29.11 | -07:32:20.2 | HIP 29521 | 11.19 |
| 2026-06-21 12:00 | 06:12:40.20 | -07:31:39.6 | HIP 29521 | 8.45 |
| 2026-06-22 00:00 | 06:12:51.29 | -07:30:59.7 | HIP 29521 | 5.80 |