P/2020 V3 (PANSTARRS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | P/2020 V3 (PANSTARRS) |
| Type | P |
| Perihelion (tp_cal, UTC) | 2021-02-07T14:40:49.393920Z |
| Orbit solution date (soln_date, UTC) | 2023-02-27T21:13:13Z |
| Obs used | 130 |
| NEO | - |
| M1 | 12.400 |
| K1 | 5.250 |
| PC | - |
| Discovery observation (MPC, UTC) | 2020-11-10T11:28:18.940800Z |
| Discovery magnitude (MPC) | 20.68 w |
| Discovery observatory (MPC) | F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2021-02-18.0000000 |
| e | 0.25487802 |
| q (au) | 6.230387 |
| a (au) | 8.361566 |
| i (deg) | 23.033098 |
| Ω (om, deg) | 198.286812 |
| ω (w, deg) | 249.240668 |
| M (ma, deg) | 0.423465 |
等級
散乱 + 全体線形
$$ M_a = (4.202 + 5.745\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 4.202 |
| n | 5.745 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) | 終了日 (UTC) | a | b |
|---|---|---|---|
| 2017-09-16 | 2021-02-03 | +49.6921 | -39.460 |
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 | 12:35:08.34 | -04:56:21.0 | HIP 61400 | 13.46 |
| 2026-06-01 12:00 | 12:35:06.66 | -04:55:35.5 | HIP 61400 | 14.09 |
| 2026-06-02 00:00 | 12:35:05.09 | -04:54:50.7 | HIP 61400 | 14.73 |
| 2026-06-02 12:00 | 12:35:03.62 | -04:54:06.5 | HIP 61400 | 15.39 |
| 2026-06-03 00:00 | 12:35:02.25 | -04:53:23.1 | HIP 61400 | 16.05 |
| 2026-06-03 12:00 | 12:35:00.98 | -04:52:40.4 | HIP 61400 | 16.72 |
| 2026-06-04 00:00 | 12:34:59.82 | -04:51:58.5 | HIP 61400 | 17.38 |
| 2026-06-04 12:00 | 12:34:58.76 | -04:51:17.2 | HIP 61400 | 18.05 |
| 2026-06-05 00:00 | 12:34:57.80 | -04:50:36.6 | HIP 61400 | 18.71 |
| 2026-06-05 12:00 | 12:34:56.95 | -04:49:56.8 | HIP 61400 | 19.36 |
| 2026-06-06 00:00 | 12:34:56.20 | -04:49:17.7 | HIP 61400 | 20.00 |
| 2026-06-06 12:00 | 12:34:55.56 | -04:48:39.3 | HIP 61400 | 20.64 |
| 2026-06-07 00:00 | 12:34:55.01 | -04:48:01.6 | HIP 61400 | 21.26 |
| 2026-06-07 12:00 | 12:34:54.58 | -04:47:24.6 | HIP 61400 | 21.88 |
| 2026-06-08 00:00 | 12:34:54.25 | -04:46:48.4 | HIP 61400 | 22.48 |
| 2026-06-08 12:00 | 12:34:54.02 | -04:46:12.8 | HIP 61346 | 22.22 |
| 2026-06-09 00:00 | 12:34:53.89 | -04:45:38.0 | HIP 61346 | 21.70 |
| 2026-06-09 12:00 | 12:34:53.87 | -04:45:04.0 | HIP 61346 | 21.21 |
| 2026-06-10 00:00 | 12:34:53.96 | -04:44:30.6 | HIP 61346 | 20.74 |
| 2026-06-10 12:00 | 12:34:54.15 | -04:43:58.0 | HIP 61346 | 20.31 |
| 2026-06-11 00:00 | 12:34:54.44 | -04:43:26.1 | HIP 61346 | 19.90 |
| 2026-06-11 12:00 | 12:34:54.84 | -04:42:55.0 | HIP 61346 | 19.52 |
| 2026-06-12 00:00 | 12:34:55.35 | -04:42:24.5 | HIP 61346 | 19.18 |
| 2026-06-12 12:00 | 12:34:55.95 | -04:41:54.8 | HIP 61346 | 18.87 |
| 2026-06-13 00:00 | 12:34:56.67 | -04:41:25.8 | HIP 61346 | 18.59 |
| 2026-06-13 12:00 | 12:34:57.49 | -04:40:57.6 | HIP 61346 | 18.35 |
| 2026-06-14 00:00 | 12:34:58.41 | -04:40:30.1 | HIP 61346 | 18.15 |
| 2026-06-14 12:00 | 12:34:59.44 | -04:40:03.3 | HIP 61346 | 17.99 |
| 2026-06-15 00:00 | 12:35:00.57 | -04:39:37.3 | HIP 61346 | 17.86 |
| 2026-06-15 12:00 | 12:35:01.80 | -04:39:12.0 | HIP 61346 | 17.78 |
| 2026-06-16 00:00 | 12:35:03.15 | -04:38:47.4 | HIP 61346 | 17.74 |
| 2026-06-16 12:00 | 12:35:04.59 | -04:38:23.6 | HIP 61346 | 17.75 |
| 2026-06-17 00:00 | 12:35:06.14 | -04:38:00.4 | HIP 61346 | 17.80 |
| 2026-06-17 12:00 | 12:35:07.80 | -04:37:38.0 | HIP 61346 | 17.89 |
| 2026-06-18 00:00 | 12:35:09.56 | -04:37:16.4 | HIP 61346 | 18.03 |
| 2026-06-18 12:00 | 12:35:11.42 | -04:36:55.5 | HIP 61346 | 18.21 |
| 2026-06-19 00:00 | 12:35:13.39 | -04:36:35.3 | HIP 61346 | 18.44 |
| 2026-06-19 12:00 | 12:35:15.46 | -04:36:15.8 | HIP 61346 | 18.71 |
| 2026-06-20 00:00 | 12:35:17.63 | -04:35:57.0 | HIP 61346 | 19.03 |
| 2026-06-20 12:00 | 12:35:19.91 | -04:35:39.0 | HIP 61346 | 19.39 |
| 2026-06-21 00:00 | 12:35:22.29 | -04:35:21.7 | HIP 61346 | 19.79 |
| 2026-06-21 12:00 | 12:35:24.77 | -04:35:05.1 | HIP 61346 | 20.23 |
| 2026-06-22 00:00 | 12:35:27.36 | -04:34:49.2 | HIP 61346 | 20.72 |