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
$$ M_a = (4.204 + 5.746\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 4.204 |
| n | 5.746 |
| gf | 0.975 |
| gb | -0.501 |
| k | 1.000 |
| δ90 | 9.863 |
| 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 | +49.6914 | -39.459 |
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 | 12:50:38.78 | -07:52:59.6 | HIP 62636 | 17.19 |
| 2026-03-26 12:00 | 12:50:29.46 | -07:51:29.3 | HIP 62636 | 14.82 |
| 2026-03-27 00:00 | 12:50:20.12 | -07:49:58.8 | HIP 62636 | 12.59 |
| 2026-03-27 12:00 | 12:50:10.77 | -07:48:28.0 | HIP 62636 | 10.62 |
| 2026-03-28 00:00 | 12:50:01.40 | -07:46:57.1 | HIP 62636 | 9.07 |
| 2026-03-28 12:00 | 12:49:52.01 | -07:45:25.9 | HIP 62636 | 8.19 |
| 2026-03-29 00:00 | 12:49:42.62 | -07:43:54.6 | HIP 62636 | 8.20 |
| 2026-03-29 12:00 | 12:49:33.21 | -07:42:23.1 | HIP 62636 | 9.11 |
| 2026-03-30 00:00 | 12:49:23.79 | -07:40:51.4 | HIP 62636 | 10.69 |
| 2026-03-30 12:00 | 12:49:14.37 | -07:39:19.5 | HIP 62636 | 12.69 |
| 2026-03-31 00:00 | 12:49:04.93 | -07:37:47.5 | HIP 62636 | 14.96 |
| 2026-03-31 12:00 | 12:48:55.49 | -07:36:15.4 | HIP 62636 | 17.38 |
| 2026-04-01 00:00 | 12:48:46.05 | -07:34:43.1 | HIP 62636 | 19.90 |
| 2026-04-01 12:00 | 12:48:36.60 | -07:33:10.7 | HIP 62636 | 22.49 |
| 2026-04-02 00:00 | 12:48:27.15 | -07:31:38.2 | HIP 62636 | 25.12 |
| 2026-04-02 12:00 | 12:48:17.70 | -07:30:05.5 | HIP 62371 | 26.45 |
| 2026-04-03 00:00 | 12:48:08.24 | -07:28:32.8 | HIP 62371 | 25.91 |
| 2026-04-03 12:00 | 12:47:58.79 | -07:27:00.0 | HIP 62371 | 25.67 |
| 2026-04-04 00:00 | 12:47:49.35 | -07:25:27.1 | HIP 62371 | 25.74 |
| 2026-04-04 12:00 | 12:47:39.91 | -07:23:54.2 | HIP 62371 | 26.12 |
| 2026-04-05 00:00 | 12:47:30.47 | -07:22:21.1 | HIP 62371 | 26.78 |
| 2026-04-05 12:00 | 12:47:21.04 | -07:20:48.1 | HIP 62371 | 27.72 |
| 2026-04-06 00:00 | 12:47:11.62 | -07:19:15.0 | HIP 62371 | 28.90 |
| 2026-04-06 12:00 | 12:47:02.21 | -07:17:41.8 | HIP 62371 | 30.29 |
| 2026-04-07 00:00 | 12:46:52.81 | -07:16:08.7 | HIP 62371 | 31.87 |
| 2026-04-07 12:00 | 12:46:43.42 | -07:14:35.5 | HIP 62371 | 33.61 |
| 2026-04-08 00:00 | 12:46:34.05 | -07:13:02.3 | HIP 62371 | 35.49 |
| 2026-04-08 12:00 | 12:46:24.69 | -07:11:29.1 | HIP 62153 | 35.73 |
| 2026-04-09 00:00 | 12:46:15.34 | -07:09:56.0 | HIP 62153 | 34.57 |
| 2026-04-09 12:00 | 12:46:06.02 | -07:08:22.9 | HIP 62153 | 33.60 |
| 2026-04-10 00:00 | 12:45:56.71 | -07:06:49.8 | HIP 62153 | 32.84 |
| 2026-04-10 12:00 | 12:45:47.42 | -07:05:16.7 | HIP 62153 | 32.30 |
| 2026-04-11 00:00 | 12:45:38.16 | -07:03:43.7 | HIP 62153 | 32.00 |
| 2026-04-11 12:00 | 12:45:28.92 | -07:02:10.8 | HIP 62153 | 31.94 |
| 2026-04-12 00:00 | 12:45:19.70 | -07:00:38.0 | HIP 62153 | 32.12 |
| 2026-04-12 12:00 | 12:45:10.51 | -06:59:05.2 | HIP 62153 | 32.54 |
| 2026-04-13 00:00 | 12:45:01.34 | -06:57:32.6 | HIP 62153 | 33.18 |
| 2026-04-13 12:00 | 12:44:52.21 | -06:56:00.0 | HIP 62153 | 34.03 |
| 2026-04-14 00:00 | 12:44:43.10 | -06:54:27.5 | HIP 62153 | 35.08 |
| 2026-04-14 12:00 | 12:44:34.02 | -06:52:55.2 | HIP 62153 | 36.30 |
| 2026-04-15 00:00 | 12:44:24.98 | -06:51:23.0 | HIP 62153 | 37.67 |
| 2026-04-15 12:00 | 12:44:15.97 | -06:49:51.0 | HIP 62153 | 39.19 |
| 2026-04-16 00:00 | 12:44:06.99 | -06:48:19.1 | HIP 62190 | 39.02 |