P/2021 V2 (Fuls)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | P/2021 V2 (Fuls) |
| Type | P |
| Perihelion (tp_cal, UTC) | 2023-01-21T10:09:35.496000Z |
| Orbit solution date (soln_date, UTC) | 2024-06-06T23:12:42Z |
| Obs used | 500 |
| NEO | - |
| M1 | 13.500 |
| K1 | 4.750 |
| PC | - |
| Discovery observation (MPC, UTC) | 2021-11-07T07:16:45.811200Z |
| Discovery magnitude (MPC) | 19.72 G |
| Discovery observatory (MPC) | G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2022-12-05.0000000 |
| e | 0.61379381 |
| q (au) | 3.496557 |
| a (au) | 9.053602 |
| i (deg) | 12.694194 |
| Ω (om, deg) | 232.285290 |
| ω (w, deg) | 259.829523 |
| M (ma, deg) | 358.284211 |
等級
散乱 + 全体線形
$$ M_a = (11.970 + 2.369\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 11.970 |
| n | 2.369 |
| gf | 1.000 |
| gb | -0.928 |
| 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 |
|---|---|---|---|
| 2021-08-07 | 2022-01-05 | +33.5068 | -22.228 |
| 2022-01-05 | 2023-01-20 | -9.6477 | +5.268 |
| 2023-01-22 | 2024-05-31 | +2.3305 | -1.332 |
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 | 16:55:12.50 | -18:57:52.0 | HIP 82787 | 5.03 |
| 2026-03-26 12:00 | 16:55:11.61 | -18:57:20.9 | HIP 82787 | 4.48 |
| 2026-03-27 00:00 | 16:55:10.58 | -18:56:49.6 | HIP 82787 | 3.91 |
| 2026-03-27 12:00 | 16:55:09.42 | -18:56:18.1 | HIP 82787 | 3.33 |
| 2026-03-28 00:00 | 16:55:08.11 | -18:55:46.3 | HIP 82787 | 2.76 |
| 2026-03-28 12:00 | 16:55:06.67 | -18:55:14.3 | HIP 82787 | 2.19 |
| 2026-03-29 00:00 | 16:55:05.09 | -18:54:42.2 | HIP 82787 | 1.68 |
| 2026-03-29 12:00 | 16:55:03.38 | -18:54:09.8 | HIP 82787 | 1.32 |
| 2026-03-30 00:00 | 16:55:01.53 | -18:53:37.2 | HIP 82787 | 1.28 |
| 2026-03-30 12:00 | 16:54:59.54 | -18:53:04.4 | HIP 82787 | 1.62 |
| 2026-03-31 00:00 | 16:54:57.41 | -18:52:31.3 | HIP 82787 | 2.19 |
| 2026-03-31 12:00 | 16:54:55.15 | -18:51:58.1 | HIP 82787 | 2.87 |
| 2026-04-01 00:00 | 16:54:52.76 | -18:51:24.7 | HIP 82787 | 3.61 |
| 2026-04-01 12:00 | 16:54:50.23 | -18:50:51.1 | HIP 82787 | 4.41 |
| 2026-04-02 00:00 | 16:54:47.56 | -18:50:17.2 | HIP 82787 | 5.24 |
| 2026-04-02 12:00 | 16:54:44.76 | -18:49:43.2 | HIP 82787 | 6.10 |
| 2026-04-03 00:00 | 16:54:41.83 | -18:49:09.0 | HIP 82787 | 7.00 |
| 2026-04-03 12:00 | 16:54:38.76 | -18:48:34.6 | HIP 82787 | 7.92 |
| 2026-04-04 00:00 | 16:54:35.56 | -18:48:00.0 | HIP 82674 | 8.85 |
| 2026-04-04 12:00 | 16:54:32.23 | -18:47:25.1 | HIP 82674 | 7.91 |
| 2026-04-05 00:00 | 16:54:28.76 | -18:46:50.1 | HIP 82674 | 6.94 |
| 2026-04-05 12:00 | 16:54:25.16 | -18:46:14.9 | HIP 82674 | 5.95 |
| 2026-04-06 00:00 | 16:54:21.43 | -18:45:39.5 | HIP 82674 | 4.95 |
| 2026-04-06 12:00 | 16:54:17.57 | -18:45:04.0 | HIP 82674 | 3.94 |
| 2026-04-07 00:00 | 16:54:13.57 | -18:44:28.2 | HIP 82674 | 2.97 |
| 2026-04-07 12:00 | 16:54:09.45 | -18:43:52.3 | HIP 82674 | 2.12 |
| 2026-04-08 00:00 | 16:54:05.20 | -18:43:16.1 | HIP 82674 | 1.66 |
| 2026-04-08 12:00 | 16:54:00.81 | -18:42:39.8 | HIP 82674 | 1.94 |
| 2026-04-09 00:00 | 16:53:56.30 | -18:42:03.4 | HIP 82674 | 2.78 |
| 2026-04-09 12:00 | 16:53:51.66 | -18:41:26.7 | HIP 82674 | 3.86 |
| 2026-04-10 00:00 | 16:53:46.89 | -18:40:49.9 | HIP 82674 | 5.04 |
| 2026-04-10 12:00 | 16:53:41.99 | -18:40:12.9 | HIP 82674 | 6.29 |
| 2026-04-11 00:00 | 16:53:36.97 | -18:39:35.7 | HIP 82674 | 7.58 |
| 2026-04-11 12:00 | 16:53:31.81 | -18:38:58.3 | HIP 82674 | 8.92 |
| 2026-04-12 00:00 | 16:53:26.54 | -18:38:20.8 | HIP 82674 | 10.29 |
| 2026-04-12 12:00 | 16:53:21.14 | -18:37:43.1 | HIP 82674 | 11.69 |
| 2026-04-13 00:00 | 16:53:15.61 | -18:37:05.3 | HIP 82674 | 13.12 |
| 2026-04-13 12:00 | 16:53:09.96 | -18:36:27.3 | HIP 82674 | 14.58 |
| 2026-04-14 00:00 | 16:53:04.18 | -18:35:49.1 | HIP 82674 | 16.07 |
| 2026-04-14 12:00 | 16:52:58.29 | -18:35:10.8 | HIP 82674 | 17.59 |
| 2026-04-15 00:00 | 16:52:52.27 | -18:34:32.3 | HIP 82674 | 19.14 |
| 2026-04-15 12:00 | 16:52:46.13 | -18:33:53.7 | HIP 82674 | 20.72 |
| 2026-04-16 00:00 | 16:52:39.87 | -18:33:14.9 | HIP 82674 | 22.33 |