C/2011 L4 (PANSTARRS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2011 L4 (PANSTARRS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2013-03-10T04:04:44.544000Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:31:52Z |
| Obs used | 5413 |
| NEO | - |
| M1 | 7.800 |
| K1 | 6.500 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2013-03-14.0000000 |
| e | 1.00003277 |
| q (au) | 0.301544 |
| a (au) | -9202.649647 |
| i (deg) | 84.208197 |
| Ω (om, deg) | 65.665886 |
| ω (w, deg) | 333.651638 |
| M (ma, deg) | 0.000004 |
等級
散乱 + 全体線形
$$ M_a = (8.602 + 5.378\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 8.602 |
| n | 5.378 |
| gf | 1.000 |
| gb | -0.915 |
| k | 0.815 |
| δ90 | 9.995 |
| 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 |
|---|---|---|---|
| 2011-05-21 | 2012-04-20 | +7.9822 | -7.065 |
| 2012-04-20 | 2012-07-07 | +11.8613 | -8.636 |
| 2012-07-07 | 2013-03-09 | -1.6663 | -1.493 |
| 2013-03-10 | 2013-04-20 | +2.6306 | -0.220 |
| 2013-04-20 | 2014-08-27 | +0.8922 | -0.673 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 16:19:39.19 | +17:04:18.8 | HIP 79926 | 23.02 |
| 2026-07-29 12:00 | 16:19:37.24 | +17:03:50.7 | HIP 79926 | 23.19 |
| 2026-07-30 00:00 | 16:19:35.32 | +17:03:22.5 | HIP 79926 | 23.38 |
| 2026-07-30 12:00 | 16:19:33.43 | +17:02:54.2 | HIP 79926 | 23.59 |
| 2026-07-31 00:00 | 16:19:31.57 | +17:02:25.6 | HIP 79926 | 23.82 |
| 2026-07-31 12:00 | 16:19:29.74 | +17:01:56.8 | HIP 79926 | 24.08 |
| 2026-08-01 00:00 | 16:19:27.94 | +17:01:27.9 | HIP 79926 | 24.35 |
| 2026-08-01 12:00 | 16:19:26.16 | +17:00:58.8 | HIP 79926 | 24.65 |
| 2026-08-02 00:00 | 16:19:24.42 | +17:00:29.5 | HIP 79926 | 24.96 |
| 2026-08-02 12:00 | 16:19:22.71 | +17:00:00.0 | HIP 79918 | 24.85 |
| 2026-08-03 00:00 | 16:19:21.03 | +16:59:30.3 | HIP 79918 | 24.24 |
| 2026-08-03 12:00 | 16:19:19.38 | +16:59:00.5 | HIP 79918 | 23.63 |
| 2026-08-04 00:00 | 16:19:17.76 | +16:58:30.5 | HIP 79918 | 23.03 |
| 2026-08-04 12:00 | 16:19:16.17 | +16:58:00.3 | HIP 79918 | 22.43 |
| 2026-08-05 00:00 | 16:19:14.60 | +16:57:30.0 | HIP 79918 | 21.83 |
| 2026-08-05 12:00 | 16:19:13.08 | +16:56:59.5 | HIP 79918 | 21.23 |
| 2026-08-06 00:00 | 16:19:11.58 | +16:56:28.8 | HIP 79918 | 20.63 |
| 2026-08-06 12:00 | 16:19:10.11 | +16:55:58.0 | HIP 79918 | 20.03 |
| 2026-08-07 00:00 | 16:19:08.67 | +16:55:27.0 | HIP 79918 | 19.43 |
| 2026-08-07 12:00 | 16:19:07.27 | +16:54:55.9 | HIP 79918 | 18.84 |
| 2026-08-08 00:00 | 16:19:05.89 | +16:54:24.6 | HIP 79918 | 18.25 |
| 2026-08-08 12:00 | 16:19:04.55 | +16:53:53.2 | HIP 79918 | 17.65 |
| 2026-08-09 00:00 | 16:19:03.24 | +16:53:21.6 | HIP 79918 | 17.06 |
| 2026-08-09 12:00 | 16:19:01.95 | +16:52:49.8 | HIP 79918 | 16.47 |
| 2026-08-10 00:00 | 16:19:00.71 | +16:52:17.9 | HIP 79918 | 15.88 |
| 2026-08-10 12:00 | 16:18:59.49 | +16:51:45.9 | HIP 79918 | 15.29 |
| 2026-08-11 00:00 | 16:18:58.30 | +16:51:13.7 | HIP 79918 | 14.71 |
| 2026-08-11 12:00 | 16:18:57.15 | +16:50:41.4 | HIP 79918 | 14.12 |
| 2026-08-12 00:00 | 16:18:56.03 | +16:50:09.0 | HIP 79918 | 13.53 |
| 2026-08-12 12:00 | 16:18:54.94 | +16:49:36.4 | HIP 79918 | 12.95 |
| 2026-08-13 00:00 | 16:18:53.88 | +16:49:03.7 | HIP 79918 | 12.37 |
| 2026-08-13 12:00 | 16:18:52.85 | +16:48:30.9 | HIP 79918 | 11.79 |
| 2026-08-14 00:00 | 16:18:51.86 | +16:47:57.9 | HIP 79918 | 11.20 |
| 2026-08-14 12:00 | 16:18:50.90 | +16:47:24.8 | HIP 79918 | 10.62 |
| 2026-08-15 00:00 | 16:18:49.97 | +16:46:51.6 | HIP 79918 | 10.05 |
| 2026-08-15 12:00 | 16:18:49.07 | +16:46:18.3 | HIP 79918 | 9.47 |
| 2026-08-16 00:00 | 16:18:48.21 | +16:45:44.9 | HIP 79918 | 8.89 |
| 2026-08-16 12:00 | 16:18:47.38 | +16:45:11.3 | HIP 79918 | 8.32 |
| 2026-08-17 00:00 | 16:18:46.58 | +16:44:37.7 | HIP 79918 | 7.74 |
| 2026-08-17 12:00 | 16:18:45.81 | +16:44:03.9 | HIP 79918 | 7.17 |
| 2026-08-18 00:00 | 16:18:45.08 | +16:43:30.0 | HIP 79918 | 6.60 |
| 2026-08-18 12:00 | 16:18:44.37 | +16:42:56.1 | HIP 79918 | 6.03 |
| 2026-08-19 00:00 | 16:18:43.71 | +16:42:22.0 | HIP 79918 | 5.47 |