C/2016 Q2 (PANSTARRS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2016 Q2 (PANSTARRS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2021-05-11T15:07:39.907200Z |
| Orbit solution date (soln_date, UTC) | 2024-04-20T20:42:17Z |
| Obs used | 662 |
| NEO | - |
| M1 | 10.800 |
| K1 | 4.500 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-08-26.0000000 |
| e | 0.99986869 |
| q (au) | 7.082106 |
| a (au) | 53935.651327 |
| i (deg) | 109.388884 |
| Ω (om, deg) | 322.298041 |
| ω (w, deg) | 84.508570 |
| M (ma, deg) | 359.999980 |
等級
散乱 + 全体線形
$$ M_a = (9.586 + 4.868\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 9.586 |
| n | 4.868 |
| gf | 1.000 |
| gb | -0.925 |
| k | 0.800 |
| 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 |
|---|---|---|---|
| 2016-08-26 | 2017-08-25 | -21.8320 | +23.366 |
| 2017-08-25 | 2018-08-14 | -2.5298 | +3.124 |
| 2018-08-14 | 2019-08-10 | +29.5957 | -28.173 |
| 2019-08-10 | 2021-05-07 | -11.4200 | +9.723 |
| 2021-05-13 | 2024-04-12 | +5.4378 | -4.459 |
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) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 09:47:43.13 | +22:56:21.3 | HIP 48144 | 25.46 |
| 2026-06-01 12:00 | 09:47:43.94 | +22:55:19.0 | HIP 48144 | 24.54 |
| 2026-06-02 00:00 | 09:47:44.82 | +22:54:16.5 | HIP 48144 | 23.62 |
| 2026-06-02 12:00 | 09:47:45.77 | +22:53:13.8 | HIP 48144 | 22.70 |
| 2026-06-03 00:00 | 09:47:46.79 | +22:52:10.8 | HIP 48144 | 21.78 |
| 2026-06-03 12:00 | 09:47:47.88 | +22:51:07.7 | HIP 48144 | 20.86 |
| 2026-06-04 00:00 | 09:47:49.03 | +22:50:04.4 | HIP 48144 | 19.94 |
| 2026-06-04 12:00 | 09:47:50.26 | +22:49:00.9 | HIP 48144 | 19.02 |
| 2026-06-05 00:00 | 09:47:51.56 | +22:47:57.3 | HIP 48144 | 18.11 |
| 2026-06-05 12:00 | 09:47:52.92 | +22:46:53.4 | HIP 48144 | 17.21 |
| 2026-06-06 00:00 | 09:47:54.35 | +22:45:49.3 | HIP 48144 | 16.32 |
| 2026-06-06 12:00 | 09:47:55.85 | +22:44:45.1 | HIP 48144 | 15.45 |
| 2026-06-07 00:00 | 09:47:57.41 | +22:43:40.7 | HIP 48144 | 14.59 |
| 2026-06-07 12:00 | 09:47:59.04 | +22:42:36.1 | HIP 48144 | 13.76 |
| 2026-06-08 00:00 | 09:48:00.74 | +22:41:31.4 | HIP 48144 | 12.96 |
| 2026-06-08 12:00 | 09:48:02.51 | +22:40:26.4 | HIP 48144 | 12.20 |
| 2026-06-09 00:00 | 09:48:04.33 | +22:39:21.3 | HIP 48144 | 11.49 |
| 2026-06-09 12:00 | 09:48:06.23 | +22:38:16.0 | HIP 48144 | 10.85 |
| 2026-06-10 00:00 | 09:48:08.19 | +22:37:10.6 | HIP 48144 | 10.28 |
| 2026-06-10 12:00 | 09:48:10.21 | +22:36:05.0 | HIP 48144 | 9.81 |
| 2026-06-11 00:00 | 09:48:12.30 | +22:34:59.2 | HIP 48144 | 9.45 |
| 2026-06-11 12:00 | 09:48:14.45 | +22:33:53.3 | HIP 48144 | 9.22 |
| 2026-06-12 00:00 | 09:48:16.66 | +22:32:47.2 | HIP 48144 | 9.13 |
| 2026-06-12 12:00 | 09:48:18.94 | +22:31:41.0 | HIP 48144 | 9.19 |
| 2026-06-13 00:00 | 09:48:21.28 | +22:30:34.6 | HIP 48144 | 9.40 |
| 2026-06-13 12:00 | 09:48:23.68 | +22:29:28.1 | HIP 48144 | 9.76 |
| 2026-06-14 00:00 | 09:48:26.14 | +22:28:21.4 | HIP 48144 | 10.24 |
| 2026-06-14 12:00 | 09:48:28.67 | +22:27:14.5 | HIP 48144 | 10.85 |
| 2026-06-15 00:00 | 09:48:31.25 | +22:26:07.6 | HIP 48144 | 11.55 |
| 2026-06-15 12:00 | 09:48:33.90 | +22:25:00.4 | HIP 48144 | 12.35 |
| 2026-06-16 00:00 | 09:48:36.60 | +22:23:53.2 | HIP 48144 | 13.21 |
| 2026-06-16 12:00 | 09:48:39.36 | +22:22:45.8 | HIP 48144 | 14.14 |
| 2026-06-17 00:00 | 09:48:42.19 | +22:21:38.3 | HIP 48144 | 15.13 |
| 2026-06-17 12:00 | 09:48:45.07 | +22:20:30.6 | HIP 48144 | 16.15 |
| 2026-06-18 00:00 | 09:48:48.01 | +22:19:22.8 | HIP 48137 | 16.74 |
| 2026-06-18 12:00 | 09:48:51.00 | +22:18:14.9 | HIP 48137 | 15.61 |
| 2026-06-19 00:00 | 09:48:54.06 | +22:17:06.9 | HIP 48137 | 14.52 |
| 2026-06-19 12:00 | 09:48:57.17 | +22:15:58.7 | HIP 48137 | 13.46 |
| 2026-06-20 00:00 | 09:49:00.33 | +22:14:50.5 | HIP 48137 | 12.47 |
| 2026-06-20 12:00 | 09:49:03.55 | +22:13:42.1 | HIP 48137 | 11.55 |
| 2026-06-21 00:00 | 09:49:06.83 | +22:12:33.6 | HIP 48137 | 10.72 |
| 2026-06-21 12:00 | 09:49:10.16 | +22:11:25.0 | HIP 48137 | 10.03 |
| 2026-06-22 00:00 | 09:49:13.55 | +22:10:16.3 | HIP 48137 | 9.48 |