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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 09:55:21.62 | +20:42:57.3 | HIP 48684 | 16.21 |
| 2026-07-29 12:00 | 09:55:27.73 | +20:41:46.4 | HIP 48684 | 16.96 |
| 2026-07-30 00:00 | 09:55:33.87 | +20:40:35.5 | HIP 48684 | 17.87 |
| 2026-07-30 12:00 | 09:55:40.02 | +20:39:24.7 | HIP 48684 | 18.92 |
| 2026-07-31 00:00 | 09:55:46.19 | +20:38:13.9 | HIP 48778 | 18.36 |
| 2026-07-31 12:00 | 09:55:52.38 | +20:37:03.2 | HIP 48778 | 17.70 |
| 2026-08-01 00:00 | 09:55:58.59 | +20:35:52.5 | HIP 48778 | 17.21 |
| 2026-08-01 12:00 | 09:56:04.81 | +20:34:41.9 | HIP 48778 | 16.91 |
| 2026-08-02 00:00 | 09:56:11.04 | +20:33:31.4 | HIP 48778 | 16.81 |
| 2026-08-02 12:00 | 09:56:17.30 | +20:32:20.9 | HIP 48778 | 16.92 |
| 2026-08-03 00:00 | 09:56:23.56 | +20:31:10.4 | HIP 48778 | 17.23 |
| 2026-08-03 12:00 | 09:56:29.84 | +20:30:00.1 | HIP 48778 | 17.73 |
| 2026-08-04 00:00 | 09:56:36.14 | +20:28:49.8 | HIP 48778 | 18.40 |
| 2026-08-04 12:00 | 09:56:42.45 | +20:27:39.5 | HIP 48778 | 19.24 |
| 2026-08-05 00:00 | 09:56:48.77 | +20:26:29.4 | HIP 48778 | 20.22 |
| 2026-08-05 12:00 | 09:56:55.10 | +20:25:19.3 | HIP 48837 | 18.79 |
| 2026-08-06 00:00 | 09:57:01.45 | +20:24:09.2 | HIP 48837 | 16.97 |
| 2026-08-06 12:00 | 09:57:07.81 | +20:22:59.3 | HIP 48837 | 15.17 |
| 2026-08-07 00:00 | 09:57:14.18 | +20:21:49.4 | HIP 48837 | 13.39 |
| 2026-08-07 12:00 | 09:57:20.56 | +20:20:39.6 | HIP 48837 | 11.66 |
| 2026-08-08 00:00 | 09:57:26.95 | +20:19:29.9 | HIP 48837 | 9.98 |
| 2026-08-08 12:00 | 09:57:33.35 | +20:18:20.2 | HIP 48837 | 8.39 |
| 2026-08-09 00:00 | 09:57:39.76 | +20:17:10.7 | HIP 48837 | 6.97 |
| 2026-08-09 12:00 | 09:57:46.18 | +20:16:01.2 | HIP 48837 | 5.82 |
| 2026-08-10 00:00 | 09:57:52.61 | +20:14:51.9 | HIP 48837 | 5.14 |
| 2026-08-10 12:00 | 09:57:59.05 | +20:13:42.6 | HIP 48837 | 5.12 |
| 2026-08-11 00:00 | 09:58:05.49 | +20:12:33.4 | HIP 48837 | 5.77 |
| 2026-08-11 12:00 | 09:58:11.94 | +20:11:24.3 | HIP 48837 | 6.90 |
| 2026-08-12 00:00 | 09:58:18.40 | +20:10:15.3 | HIP 48837 | 8.32 |
| 2026-08-12 12:00 | 09:58:24.86 | +20:09:06.4 | HIP 48837 | 9.90 |
| 2026-08-13 00:00 | 09:58:31.33 | +20:07:57.6 | HIP 48837 | 11.58 |
| 2026-08-13 12:00 | 09:58:37.80 | +20:06:48.9 | HIP 48837 | 13.32 |
| 2026-08-14 00:00 | 09:58:44.27 | +20:05:40.3 | HIP 48837 | 15.10 |
| 2026-08-14 12:00 | 09:58:50.75 | +20:04:31.9 | HIP 48837 | 16.91 |
| 2026-08-15 00:00 | 09:58:57.24 | +20:03:23.5 | HIP 48837 | 18.74 |
| 2026-08-15 12:00 | 09:59:03.72 | +20:02:15.3 | HIP 48837 | 20.58 |
| 2026-08-16 00:00 | 09:59:10.21 | +20:01:07.2 | HIP 48837 | 22.43 |
| 2026-08-16 12:00 | 09:59:16.70 | +19:59:59.1 | HIP 48837 | 24.29 |
| 2026-08-17 00:00 | 09:59:23.19 | +19:58:51.3 | HIP 48837 | 26.15 |
| 2026-08-17 12:00 | 09:59:29.68 | +19:57:43.5 | HIP 48837 | 28.02 |
| 2026-08-18 00:00 | 09:59:36.18 | +19:56:35.9 | HIP 48837 | 29.89 |
| 2026-08-18 12:00 | 09:59:42.67 | +19:55:28.3 | HIP 48837 | 31.76 |
| 2026-08-19 00:00 | 09:59:49.16 | +19:54:21.0 | HIP 48837 | 33.64 |