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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 13:05:05.71 | -06:18:36.2 | HIP 63871 | 7.25 |
| 2026-09-20 12:00 | 13:05:20.46 | -06:19:42.5 | HIP 63871 | 6.45 |
| 2026-09-21 00:00 | 13:05:35.23 | -06:20:48.8 | HIP 63871 | 7.75 |
| 2026-09-21 12:00 | 13:05:50.03 | -06:21:55.3 | HIP 63871 | 10.39 |
| 2026-09-22 00:00 | 13:06:04.85 | -06:23:01.9 | HIP 63871 | 13.62 |
| 2026-09-22 12:00 | 13:06:19.69 | -06:24:08.6 | HIP 63871 | 17.11 |
| 2026-09-23 00:00 | 13:06:34.55 | -06:25:15.4 | HIP 63871 | 20.74 |
| 2026-09-23 12:00 | 13:06:49.44 | -06:26:22.3 | HIP 64023 | 22.13 |
| 2026-09-24 00:00 | 13:07:04.35 | -06:27:29.3 | HIP 64023 | 22.63 |
| 2026-09-24 12:00 | 13:07:19.27 | -06:28:36.4 | HIP 64151 | 23.05 |
| 2026-09-25 00:00 | 13:07:34.22 | -06:29:43.5 | HIP 64151 | 19.51 |
| 2026-09-25 12:00 | 13:07:49.19 | -06:30:50.8 | HIP 64151 | 16.12 |
| 2026-09-26 00:00 | 13:08:04.18 | -06:31:58.1 | HIP 64151 | 13.00 |
| 2026-09-26 12:00 | 13:08:19.18 | -06:33:05.5 | HIP 64151 | 10.42 |
| 2026-09-27 00:00 | 13:08:34.21 | -06:34:13.0 | HIP 64151 | 8.85 |
| 2026-09-27 12:00 | 13:08:49.25 | -06:35:20.6 | HIP 64151 | 8.86 |
| 2026-09-28 00:00 | 13:09:04.31 | -06:36:28.2 | HIP 64151 | 10.44 |
| 2026-09-28 12:00 | 13:09:19.38 | -06:37:35.9 | HIP 64151 | 13.05 |
| 2026-09-29 00:00 | 13:09:34.48 | -06:38:43.6 | HIP 64151 | 16.19 |
| 2026-09-29 12:00 | 13:09:49.59 | -06:39:51.4 | HIP 64151 | 19.62 |
| 2026-09-30 00:00 | 13:10:04.71 | -06:40:59.3 | HIP 64151 | 23.21 |
| 2026-09-30 12:00 | 13:10:19.85 | -06:42:07.2 | HIP 64151 | 26.89 |
| 2026-10-01 00:00 | 13:10:35.00 | -06:43:15.1 | HIP 64383 | 26.30 |
| 2026-10-01 12:00 | 13:10:50.17 | -06:44:23.1 | HIP 64383 | 23.06 |
| 2026-10-02 00:00 | 13:11:05.35 | -06:45:31.2 | HIP 64383 | 20.07 |
| 2026-10-02 12:00 | 13:11:20.55 | -06:46:39.2 | HIP 64383 | 17.45 |
| 2026-10-03 00:00 | 13:11:35.76 | -06:47:47.3 | HIP 64383 | 15.41 |
| 2026-10-03 12:00 | 13:11:50.98 | -06:48:55.4 | HIP 64383 | 14.18 |
| 2026-10-04 00:00 | 13:12:06.21 | -06:50:03.6 | HIP 64383 | 14.01 |
| 2026-10-04 12:00 | 13:12:21.46 | -06:51:11.8 | HIP 64383 | 14.91 |
| 2026-10-05 00:00 | 13:12:36.71 | -06:52:20.0 | HIP 64383 | 16.73 |
| 2026-10-05 12:00 | 13:12:51.98 | -06:53:28.2 | HIP 64547 | 13.85 |
| 2026-10-06 00:00 | 13:13:07.25 | -06:54:36.4 | HIP 64547 | 9.96 |
| 2026-10-06 12:00 | 13:13:22.54 | -06:55:44.6 | HIP 64547 | 6.17 |
| 2026-10-07 00:00 | 13:13:37.83 | -06:56:52.8 | HIP 64547 | 2.88 |
| 2026-10-07 12:00 | 13:13:53.13 | -06:58:01.0 | HIP 64547 | 3.14 |
| 2026-10-08 00:00 | 13:14:08.44 | -06:59:09.2 | HIP 64547 | 6.55 |
| 2026-10-08 12:00 | 13:14:23.76 | -07:00:17.4 | HIP 64547 | 10.36 |
| 2026-10-09 00:00 | 13:14:39.08 | -07:01:25.5 | HIP 64547 | 14.26 |
| 2026-10-09 12:00 | 13:14:54.41 | -07:02:33.7 | HIP 64547 | 18.19 |
| 2026-10-10 00:00 | 13:15:09.74 | -07:03:41.8 | HIP 64547 | 22.14 |
| 2026-10-10 12:00 | 13:15:25.08 | -07:04:49.9 | HIP 64796 | 22.72 |
| 2026-10-11 00:00 | 13:15:40.43 | -07:05:58.0 | HIP 64796 | 19.81 |