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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 10:06:21.95 | +18:48:23.2 | HIP 49656 | 26.79 |
| 2026-09-20 12:00 | 10:06:27.40 | +18:47:28.4 | HIP 49656 | 25.44 |
| 2026-09-21 00:00 | 10:06:32.82 | +18:46:33.8 | HIP 49656 | 24.11 |
| 2026-09-21 12:00 | 10:06:38.20 | +18:45:39.4 | HIP 49635 | 22.59 |
| 2026-09-22 00:00 | 10:06:43.56 | +18:44:45.3 | HIP 49635 | 21.05 |
| 2026-09-22 12:00 | 10:06:48.88 | +18:43:51.5 | HIP 49635 | 19.51 |
| 2026-09-23 00:00 | 10:06:54.16 | +18:42:57.9 | HIP 49635 | 17.98 |
| 2026-09-23 12:00 | 10:06:59.42 | +18:42:04.6 | HIP 49635 | 16.46 |
| 2026-09-24 00:00 | 10:07:04.64 | +18:41:11.6 | HIP 49635 | 14.96 |
| 2026-09-24 12:00 | 10:07:09.82 | +18:40:18.8 | HIP 49635 | 13.47 |
| 2026-09-25 00:00 | 10:07:14.97 | +18:39:26.3 | HIP 49635 | 11.99 |
| 2026-09-25 12:00 | 10:07:20.09 | +18:38:34.1 | HIP 49635 | 10.52 |
| 2026-09-26 00:00 | 10:07:25.17 | +18:37:42.2 | HIP 49635 | 9.08 |
| 2026-09-26 12:00 | 10:07:30.21 | +18:36:50.5 | HIP 49635 | 7.65 |
| 2026-09-27 00:00 | 10:07:35.22 | +18:35:59.1 | HIP 49635 | 6.26 |
| 2026-09-27 12:00 | 10:07:40.19 | +18:35:08.0 | HIP 49635 | 4.92 |
| 2026-09-28 00:00 | 10:07:45.12 | +18:34:17.1 | HIP 49635 | 3.67 |
| 2026-09-28 12:00 | 10:07:50.02 | +18:33:26.6 | HIP 49635 | 2.64 |
| 2026-09-29 00:00 | 10:07:54.87 | +18:32:36.3 | HIP 49635 | 2.13 |
| 2026-09-29 12:00 | 10:07:59.69 | +18:31:46.3 | HIP 49635 | 2.48 |
| 2026-09-30 00:00 | 10:08:04.47 | +18:30:56.6 | HIP 49635 | 3.42 |
| 2026-09-30 12:00 | 10:08:09.21 | +18:30:07.2 | HIP 49635 | 4.59 |
| 2026-10-01 00:00 | 10:08:13.91 | +18:29:18.1 | HIP 49635 | 5.85 |
| 2026-10-01 12:00 | 10:08:18.57 | +18:28:29.3 | HIP 49635 | 7.14 |
| 2026-10-02 00:00 | 10:08:23.19 | +18:27:40.7 | HIP 49635 | 8.45 |
| 2026-10-02 12:00 | 10:08:27.76 | +18:26:52.5 | HIP 49635 | 9.76 |
| 2026-10-03 00:00 | 10:08:32.30 | +18:26:04.6 | HIP 49729 | 10.32 |
| 2026-10-03 12:00 | 10:08:36.79 | +18:25:16.9 | HIP 49729 | 9.96 |
| 2026-10-04 00:00 | 10:08:41.25 | +18:24:29.6 | HIP 49729 | 9.77 |
| 2026-10-04 12:00 | 10:08:45.65 | +18:23:42.6 | HIP 49729 | 9.76 |
| 2026-10-05 00:00 | 10:08:50.02 | +18:22:55.8 | HIP 49729 | 9.92 |
| 2026-10-05 12:00 | 10:08:54.34 | +18:22:09.4 | HIP 49729 | 10.25 |
| 2026-10-06 00:00 | 10:08:58.62 | +18:21:23.3 | HIP 49729 | 10.71 |
| 2026-10-06 12:00 | 10:09:02.85 | +18:20:37.5 | HIP 49729 | 11.30 |
| 2026-10-07 00:00 | 10:09:07.03 | +18:19:52.0 | HIP 49729 | 11.98 |
| 2026-10-07 12:00 | 10:09:11.17 | +18:19:06.9 | HIP 49729 | 12.75 |
| 2026-10-08 00:00 | 10:09:15.27 | +18:18:22.0 | HIP 49729 | 13.58 |
| 2026-10-08 12:00 | 10:09:19.31 | +18:17:37.5 | HIP 49813 | 13.13 |
| 2026-10-09 00:00 | 10:09:23.31 | +18:16:53.3 | HIP 49813 | 11.95 |
| 2026-10-09 12:00 | 10:09:27.27 | +18:16:09.4 | HIP 49813 | 10.78 |
| 2026-10-10 00:00 | 10:09:31.17 | +18:15:25.8 | HIP 49813 | 9.63 |
| 2026-10-10 12:00 | 10:09:35.02 | +18:14:42.6 | HIP 49813 | 8.49 |
| 2026-10-11 00:00 | 10:09:38.83 | +18:13:59.7 | HIP 49813 | 7.38 |