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
$$ M_a = (9.629 + 3.286\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 9.629 |
| n | 3.286 |
| 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 | +3.0096 | -2.438 |
| 2022-05-11 | 2022-08-27 | +3.0169 | -2.088 |
| 2022-08-27 | 2023-05-09 | -4.1442 | +1.851 |
| 2023-05-09 | 2024-01-03 | +2.1871 | -0.968 |
| 2024-01-03 | 2025-03-10 | +0.4091 | -0.340 |
| 2025-03-10 | 2026-01-09 | +12.3405 | -10.351 |
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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 05:48:30.30 | -12:36:34.5 | HIP 27506 | 14.29 |
| 2026-03-26 12:00 | 05:48:32.60 | -12:33:52.8 | HIP 27506 | 13.40 |
| 2026-03-27 00:00 | 05:48:35.01 | -12:31:11.6 | HIP 27506 | 13.03 |
| 2026-03-27 12:00 | 05:48:37.53 | -12:28:30.8 | HIP 27506 | 13.20 |
| 2026-03-28 00:00 | 05:48:40.15 | -12:25:50.5 | HIP 27506 | 13.89 |
| 2026-03-28 12:00 | 05:48:42.87 | -12:23:10.6 | HIP 27506 | 15.04 |
| 2026-03-29 00:00 | 05:48:45.70 | -12:20:31.3 | HIP 27509 | 13.33 |
| 2026-03-29 12:00 | 05:48:48.62 | -12:17:52.4 | HIP 27509 | 11.48 |
| 2026-03-30 00:00 | 05:48:51.65 | -12:15:14.1 | HIP 27509 | 10.03 |
| 2026-03-30 12:00 | 05:48:54.77 | -12:12:36.2 | HIP 27509 | 9.16 |
| 2026-03-31 00:00 | 05:48:58.00 | -12:09:58.9 | HIP 27509 | 9.04 |
| 2026-03-31 12:00 | 05:49:01.33 | -12:07:22.1 | HIP 27509 | 9.70 |
| 2026-04-01 00:00 | 05:49:04.75 | -12:04:45.8 | HIP 27509 | 10.99 |
| 2026-04-01 12:00 | 05:49:08.27 | -12:02:10.0 | HIP 27509 | 12.74 |
| 2026-04-02 00:00 | 05:49:11.89 | -11:59:34.7 | HIP 27509 | 14.77 |
| 2026-04-02 12:00 | 05:49:15.61 | -11:57:00.0 | HIP 27509 | 16.98 |
| 2026-04-03 00:00 | 05:49:19.42 | -11:54:25.8 | HIP 27509 | 19.32 |
| 2026-04-03 12:00 | 05:49:23.33 | -11:51:52.2 | HIP 27509 | 21.73 |
| 2026-04-04 00:00 | 05:49:27.34 | -11:49:19.1 | HIP 27509 | 24.21 |
| 2026-04-04 12:00 | 05:49:31.43 | -11:46:46.6 | HIP 27509 | 26.72 |
| 2026-04-05 00:00 | 05:49:35.63 | -11:44:14.6 | HIP 27657 | 26.52 |
| 2026-04-05 12:00 | 05:49:39.91 | -11:41:43.1 | HIP 27657 | 25.08 |
| 2026-04-06 00:00 | 05:49:44.29 | -11:39:12.3 | HIP 27657 | 23.84 |
| 2026-04-06 12:00 | 05:49:48.76 | -11:36:42.0 | HIP 27657 | 22.83 |
| 2026-04-07 00:00 | 05:49:53.32 | -11:34:12.3 | HIP 27657 | 22.10 |
| 2026-04-07 12:00 | 05:49:57.97 | -11:31:43.1 | HIP 27657 | 21.67 |
| 2026-04-08 00:00 | 05:50:02.72 | -11:29:14.5 | HIP 27657 | 21.55 |
| 2026-04-08 12:00 | 05:50:07.55 | -11:26:46.6 | HIP 27657 | 21.75 |
| 2026-04-09 00:00 | 05:50:12.47 | -11:24:19.2 | HIP 27657 | 22.27 |
| 2026-04-09 12:00 | 05:50:17.49 | -11:21:52.4 | HIP 27657 | 23.08 |
| 2026-04-10 00:00 | 05:50:22.59 | -11:19:26.2 | HIP 27477 | 23.57 |
| 2026-04-10 12:00 | 05:50:27.77 | -11:17:00.6 | HIP 27704 | 22.80 |
| 2026-04-11 00:00 | 05:50:33.05 | -11:14:35.6 | HIP 27704 | 22.15 |
| 2026-04-11 12:00 | 05:50:38.41 | -11:12:11.3 | HIP 27704 | 21.80 |
| 2026-04-12 00:00 | 05:50:43.86 | -11:09:47.5 | HIP 27704 | 21.77 |
| 2026-04-12 12:00 | 05:50:49.39 | -11:07:24.4 | HIP 27704 | 22.05 |
| 2026-04-13 00:00 | 05:50:55.01 | -11:05:01.9 | HIP 27704 | 22.65 |
| 2026-04-13 12:00 | 05:51:00.71 | -11:02:40.0 | HIP 27704 | 23.53 |
| 2026-04-14 00:00 | 05:51:06.49 | -11:00:18.7 | HIP 27704 | 24.67 |
| 2026-04-14 12:00 | 05:51:12.36 | -10:57:58.1 | HIP 27704 | 26.03 |
| 2026-04-15 00:00 | 05:51:18.31 | -10:55:38.2 | HIP 27704 | 27.58 |
| 2026-04-15 12:00 | 05:51:24.34 | -10:53:18.9 | HIP 27690 | 27.57 |
| 2026-04-16 00:00 | 05:51:30.45 | -10:51:00.2 | HIP 27690 | 25.04 |