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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 12:37:37.15 | -05:35:54.9 | HIP 61558 | 18.69 |
| 2026-05-12 12:00 | 12:37:31.58 | -05:34:43.2 | HIP 61558 | 18.75 |
| 2026-05-13 00:00 | 12:37:26.10 | -05:33:32.2 | HIP 61558 | 19.00 |
| 2026-05-13 12:00 | 12:37:20.72 | -05:32:21.7 | HIP 61558 | 19.41 |
| 2026-05-14 00:00 | 12:37:15.42 | -05:31:11.8 | HIP 61558 | 19.97 |
| 2026-05-14 12:00 | 12:37:10.21 | -05:30:02.5 | HIP 61558 | 20.67 |
| 2026-05-15 00:00 | 12:37:05.09 | -05:28:53.8 | HIP 61558 | 21.47 |
| 2026-05-15 12:00 | 12:37:00.06 | -05:27:45.7 | HIP 61558 | 22.37 |
| 2026-05-16 00:00 | 12:36:55.12 | -05:26:38.2 | HIP 61558 | 23.35 |
| 2026-05-16 12:00 | 12:36:50.27 | -05:25:31.3 | HIP 61558 | 24.40 |
| 2026-05-17 00:00 | 12:36:45.52 | -05:24:25.0 | HIP 61558 | 25.50 |
| 2026-05-17 12:00 | 12:36:40.86 | -05:23:19.3 | HIP 61558 | 26.64 |
| 2026-05-18 00:00 | 12:36:36.30 | -05:22:14.3 | HIP 61558 | 27.81 |
| 2026-05-18 12:00 | 12:36:31.83 | -05:21:09.9 | HIP 61400 | 27.24 |
| 2026-05-19 00:00 | 12:36:27.45 | -05:20:06.1 | HIP 61400 | 25.80 |
| 2026-05-19 12:00 | 12:36:23.18 | -05:19:03.0 | HIP 61400 | 24.39 |
| 2026-05-20 00:00 | 12:36:18.99 | -05:18:00.5 | HIP 61400 | 23.03 |
| 2026-05-20 12:00 | 12:36:14.91 | -05:16:58.6 | HIP 61400 | 21.71 |
| 2026-05-21 00:00 | 12:36:10.92 | -05:15:57.4 | HIP 61400 | 20.42 |
| 2026-05-21 12:00 | 12:36:07.03 | -05:14:56.8 | HIP 61400 | 19.19 |
| 2026-05-22 00:00 | 12:36:03.23 | -05:13:56.9 | HIP 61400 | 18.01 |
| 2026-05-22 12:00 | 12:35:59.54 | -05:12:57.7 | HIP 61400 | 16.88 |
| 2026-05-23 00:00 | 12:35:55.94 | -05:11:59.1 | HIP 61400 | 15.81 |
| 2026-05-23 12:00 | 12:35:52.44 | -05:11:01.2 | HIP 61400 | 14.81 |
| 2026-05-24 00:00 | 12:35:49.04 | -05:10:04.0 | HIP 61400 | 13.88 |
| 2026-05-24 12:00 | 12:35:45.74 | -05:09:07.4 | HIP 61400 | 13.04 |
| 2026-05-25 00:00 | 12:35:42.54 | -05:08:11.5 | HIP 61400 | 12.29 |
| 2026-05-25 12:00 | 12:35:39.44 | -05:07:16.3 | HIP 61400 | 11.64 |
| 2026-05-26 00:00 | 12:35:36.44 | -05:06:21.8 | HIP 61400 | 11.11 |
| 2026-05-26 12:00 | 12:35:33.54 | -05:05:27.9 | HIP 61400 | 10.70 |
| 2026-05-27 00:00 | 12:35:30.75 | -05:04:34.7 | HIP 61400 | 10.42 |
| 2026-05-27 12:00 | 12:35:28.05 | -05:03:42.3 | HIP 61400 | 10.28 |
| 2026-05-28 00:00 | 12:35:25.45 | -05:02:50.4 | HIP 61400 | 10.26 |
| 2026-05-28 12:00 | 12:35:22.96 | -05:01:59.3 | HIP 61400 | 10.36 |
| 2026-05-29 00:00 | 12:35:20.56 | -05:01:08.9 | HIP 61400 | 10.58 |
| 2026-05-29 12:00 | 12:35:18.27 | -05:00:19.2 | HIP 61400 | 10.90 |
| 2026-05-30 00:00 | 12:35:16.08 | -04:59:30.2 | HIP 61400 | 11.30 |
| 2026-05-30 12:00 | 12:35:13.99 | -04:58:41.8 | HIP 61400 | 11.76 |
| 2026-05-31 00:00 | 12:35:12.01 | -04:57:54.2 | HIP 61400 | 12.29 |
| 2026-05-31 12:00 | 12:35:10.12 | -04:57:07.2 | HIP 61400 | 12.86 |
| 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 |