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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 06:36:11.49 | -08:09:46.3 | HIP 31656 | 20.40 |
| 2026-09-20 12:00 | 06:36:13.19 | -08:10:33.8 | HIP 31656 | 19.83 |
| 2026-09-21 00:00 | 06:36:14.80 | -08:11:21.4 | HIP 31656 | 19.31 |
| 2026-09-21 12:00 | 06:36:16.31 | -08:12:09.0 | HIP 31656 | 18.84 |
| 2026-09-22 00:00 | 06:36:17.74 | -08:12:56.8 | HIP 31656 | 18.42 |
| 2026-09-22 12:00 | 06:36:19.07 | -08:13:44.6 | HIP 31656 | 18.06 |
| 2026-09-23 00:00 | 06:36:20.30 | -08:14:32.5 | HIP 31656 | 17.75 |
| 2026-09-23 12:00 | 06:36:21.44 | -08:15:20.5 | HIP 31656 | 17.51 |
| 2026-09-24 00:00 | 06:36:22.49 | -08:16:08.6 | HIP 31656 | 17.32 |
| 2026-09-24 12:00 | 06:36:23.44 | -08:16:56.7 | HIP 31656 | 17.20 |
| 2026-09-25 00:00 | 06:36:24.30 | -08:17:44.9 | HIP 31656 | 17.14 |
| 2026-09-25 12:00 | 06:36:25.06 | -08:18:33.1 | HIP 31656 | 17.15 |
| 2026-09-26 00:00 | 06:36:25.73 | -08:19:21.3 | HIP 31656 | 17.21 |
| 2026-09-26 12:00 | 06:36:26.30 | -08:20:09.6 | HIP 31656 | 17.34 |
| 2026-09-27 00:00 | 06:36:26.78 | -08:20:57.9 | HIP 31656 | 17.53 |
| 2026-09-27 12:00 | 06:36:27.16 | -08:21:46.3 | HIP 31656 | 17.77 |
| 2026-09-28 00:00 | 06:36:27.44 | -08:22:34.6 | HIP 31656 | 18.07 |
| 2026-09-28 12:00 | 06:36:27.63 | -08:23:23.0 | HIP 31656 | 18.42 |
| 2026-09-29 00:00 | 06:36:27.72 | -08:24:11.4 | HIP 31656 | 18.82 |
| 2026-09-29 12:00 | 06:36:27.72 | -08:24:59.8 | HIP 31656 | 19.26 |
| 2026-09-30 00:00 | 06:36:27.62 | -08:25:48.2 | HIP 31656 | 19.75 |
| 2026-09-30 12:00 | 06:36:27.42 | -08:26:36.5 | HIP 31656 | 20.27 |
| 2026-10-01 00:00 | 06:36:27.12 | -08:27:24.9 | HIP 31656 | 20.83 |
| 2026-10-01 12:00 | 06:36:26.73 | -08:28:13.2 | HIP 31656 | 21.43 |
| 2026-10-02 00:00 | 06:36:26.23 | -08:29:01.5 | HIP 31656 | 22.06 |
| 2026-10-02 12:00 | 06:36:25.65 | -08:29:49.8 | HIP 31656 | 22.71 |
| 2026-10-03 00:00 | 06:36:24.96 | -08:30:38.0 | HIP 31656 | 23.40 |
| 2026-10-03 12:00 | 06:36:24.17 | -08:31:26.2 | HIP 31656 | 24.10 |
| 2026-10-04 00:00 | 06:36:23.29 | -08:32:14.4 | HIP 31656 | 24.83 |
| 2026-10-04 12:00 | 06:36:22.30 | -08:33:02.4 | HIP 31371 | 25.36 |
| 2026-10-05 00:00 | 06:36:21.22 | -08:33:50.4 | HIP 31371 | 25.00 |
| 2026-10-05 12:00 | 06:36:20.04 | -08:34:38.3 | HIP 31371 | 24.64 |
| 2026-10-06 00:00 | 06:36:18.75 | -08:35:26.2 | HIP 31371 | 24.27 |
| 2026-10-06 12:00 | 06:36:17.37 | -08:36:13.9 | HIP 31371 | 23.91 |
| 2026-10-07 00:00 | 06:36:15.89 | -08:37:01.6 | HIP 31371 | 23.55 |
| 2026-10-07 12:00 | 06:36:14.31 | -08:37:49.1 | HIP 31371 | 23.19 |
| 2026-10-08 00:00 | 06:36:12.63 | -08:38:36.5 | HIP 31490 | 22.63 |
| 2026-10-08 12:00 | 06:36:10.85 | -08:39:23.8 | HIP 31490 | 21.74 |
| 2026-10-09 00:00 | 06:36:08.97 | -08:40:11.0 | HIP 31490 | 20.84 |
| 2026-10-09 12:00 | 06:36:06.99 | -08:40:58.1 | HIP 31490 | 19.95 |
| 2026-10-10 00:00 | 06:36:04.90 | -08:41:45.0 | HIP 31490 | 19.05 |
| 2026-10-10 12:00 | 06:36:02.72 | -08:42:31.7 | HIP 31490 | 18.15 |
| 2026-10-11 00:00 | 06:36:00.44 | -08:43:18.3 | HIP 31490 | 17.25 |