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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 13:01:10.00 | -09:42:55.9 | HIP 63573 | 8.81 |
| 2026-02-03 12:00 | 13:01:08.50 | -09:42:25.7 | HIP 63573 | 8.90 |
| 2026-02-04 00:00 | 13:01:06.88 | -09:41:54.7 | HIP 63573 | 9.05 |
| 2026-02-04 12:00 | 13:01:05.14 | -09:41:23.0 | HIP 63573 | 9.26 |
| 2026-02-05 00:00 | 13:01:03.30 | -09:40:50.4 | HIP 63573 | 9.55 |
| 2026-02-05 12:00 | 13:01:01.34 | -09:40:17.1 | HIP 63573 | 9.90 |
| 2026-02-06 00:00 | 13:00:59.27 | -09:39:43.0 | HIP 63573 | 10.31 |
| 2026-02-06 12:00 | 13:00:57.09 | -09:39:08.2 | HIP 63573 | 10.80 |
| 2026-02-07 00:00 | 13:00:54.80 | -09:38:32.5 | HIP 63573 | 11.34 |
| 2026-02-07 12:00 | 13:00:52.40 | -09:37:56.1 | HIP 63573 | 11.94 |
| 2026-02-08 00:00 | 13:00:49.89 | -09:37:18.9 | HIP 63573 | 12.60 |
| 2026-02-08 12:00 | 13:00:47.26 | -09:36:40.9 | HIP 63573 | 13.32 |
| 2026-02-09 00:00 | 13:00:44.53 | -09:36:02.2 | HIP 63573 | 14.08 |
| 2026-02-09 12:00 | 13:00:41.69 | -09:35:22.7 | HIP 63573 | 14.89 |
| 2026-02-10 00:00 | 13:00:38.74 | -09:34:42.4 | HIP 63573 | 15.75 |
| 2026-02-10 12:00 | 13:00:35.68 | -09:34:01.3 | HIP 63573 | 16.65 |
| 2026-02-11 00:00 | 13:00:32.51 | -09:33:19.5 | HIP 63573 | 17.60 |
| 2026-02-11 12:00 | 13:00:29.23 | -09:32:36.9 | HIP 63573 | 18.58 |
| 2026-02-12 00:00 | 13:00:25.85 | -09:31:53.6 | HIP 63573 | 19.61 |
| 2026-02-12 12:00 | 13:00:22.35 | -09:31:09.5 | HIP 63573 | 20.67 |
| 2026-02-13 00:00 | 13:00:18.76 | -09:30:24.6 | HIP 63573 | 21.77 |
| 2026-02-13 12:00 | 13:00:15.05 | -09:29:38.9 | HIP 63573 | 22.90 |
| 2026-02-14 00:00 | 13:00:11.24 | -09:28:52.6 | HIP 63486 | 23.30 |
| 2026-02-14 12:00 | 13:00:07.33 | -09:28:05.4 | HIP 63486 | 22.74 |
| 2026-02-15 00:00 | 13:00:03.31 | -09:27:17.5 | HIP 63486 | 22.24 |
| 2026-02-15 12:00 | 12:59:59.18 | -09:26:28.9 | HIP 63486 | 21.79 |
| 2026-02-16 00:00 | 12:59:54.96 | -09:25:39.5 | HIP 63486 | 21.41 |
| 2026-02-16 12:00 | 12:59:50.63 | -09:24:49.3 | HIP 63486 | 21.11 |
| 2026-02-17 00:00 | 12:59:46.20 | -09:23:58.5 | HIP 63486 | 20.90 |
| 2026-02-17 12:00 | 12:59:41.67 | -09:23:06.9 | HIP 63486 | 20.78 |
| 2026-02-18 00:00 | 12:59:37.03 | -09:22:14.5 | HIP 63486 | 20.76 |
| 2026-02-18 12:00 | 12:59:32.30 | -09:21:21.4 | HIP 63486 | 20.85 |
| 2026-02-19 00:00 | 12:59:27.47 | -09:20:27.6 | HIP 63486 | 21.05 |
| 2026-02-19 12:00 | 12:59:22.54 | -09:19:33.1 | HIP 63486 | 21.37 |
| 2026-02-20 00:00 | 12:59:17.51 | -09:18:37.9 | HIP 63486 | 21.80 |
| 2026-02-20 12:00 | 12:59:12.38 | -09:17:42.0 | HIP 63486 | 22.34 |
| 2026-02-21 00:00 | 12:59:07.16 | -09:16:45.3 | HIP 63486 | 22.99 |
| 2026-02-21 12:00 | 12:59:01.84 | -09:15:47.9 | HIP 63486 | 23.75 |
| 2026-02-22 00:00 | 12:58:56.43 | -09:14:49.9 | HIP 63486 | 24.61 |
| 2026-02-22 12:00 | 12:58:50.93 | -09:13:51.1 | HIP 63486 | 25.57 |
| 2026-02-23 00:00 | 12:58:45.33 | -09:12:51.7 | HIP 63486 | 26.62 |
| 2026-02-23 12:00 | 12:58:39.64 | -09:11:51.6 | HIP 63225 | 26.31 |
| 2026-02-24 00:00 | 12:58:33.86 | -09:10:50.8 | HIP 63225 | 24.57 |