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
$$ M_a = (8.601 + 5.378\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 8.601 |
| 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 | +7.9824 | -7.065 |
| 2012-04-20 | 2012-07-07 | +11.8617 | -8.636 |
| 2012-07-07 | 2013-03-09 | -1.6664 | -1.493 |
| 2013-03-10 | 2013-04-20 | +2.6306 | -0.220 |
| 2013-04-20 | 2014-08-27 | +0.8921 | -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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 16:28:33.44 | +17:22:18.5 | HIP 80662 | 9.35 |
| 2026-05-12 12:00 | 16:28:29.62 | +17:22:35.0 | HIP 80662 | 8.57 |
| 2026-05-13 00:00 | 16:28:25.79 | +17:22:51.2 | HIP 80662 | 7.83 |
| 2026-05-13 12:00 | 16:28:21.94 | +17:23:07.1 | HIP 80662 | 7.14 |
| 2026-05-14 00:00 | 16:28:18.09 | +17:23:22.7 | HIP 80662 | 6.53 |
| 2026-05-14 12:00 | 16:28:14.23 | +17:23:38.0 | HIP 80662 | 6.00 |
| 2026-05-15 00:00 | 16:28:10.36 | +17:23:53.1 | HIP 80662 | 5.60 |
| 2026-05-15 12:00 | 16:28:06.48 | +17:24:07.8 | HIP 80662 | 5.35 |
| 2026-05-16 00:00 | 16:28:02.59 | +17:24:22.2 | HIP 80662 | 5.27 |
| 2026-05-16 12:00 | 16:27:58.69 | +17:24:36.4 | HIP 80662 | 5.36 |
| 2026-05-17 00:00 | 16:27:54.79 | +17:24:50.2 | HIP 80662 | 5.63 |
| 2026-05-17 12:00 | 16:27:50.87 | +17:25:03.8 | HIP 80662 | 6.04 |
| 2026-05-18 00:00 | 16:27:46.95 | +17:25:17.0 | HIP 80662 | 6.57 |
| 2026-05-18 12:00 | 16:27:43.03 | +17:25:30.0 | HIP 80662 | 7.20 |
| 2026-05-19 00:00 | 16:27:39.10 | +17:25:42.6 | HIP 80662 | 7.89 |
| 2026-05-19 12:00 | 16:27:35.16 | +17:25:55.0 | HIP 80662 | 8.64 |
| 2026-05-20 00:00 | 16:27:31.21 | +17:26:07.0 | HIP 80662 | 9.44 |
| 2026-05-20 12:00 | 16:27:27.26 | +17:26:18.7 | HIP 80662 | 10.26 |
| 2026-05-21 00:00 | 16:27:23.31 | +17:26:30.2 | HIP 80662 | 11.11 |
| 2026-05-21 12:00 | 16:27:19.35 | +17:26:41.3 | HIP 80662 | 11.98 |
| 2026-05-22 00:00 | 16:27:15.38 | +17:26:52.1 | HIP 80662 | 12.86 |
| 2026-05-22 12:00 | 16:27:11.42 | +17:27:02.6 | HIP 80662 | 13.76 |
| 2026-05-23 00:00 | 16:27:07.44 | +17:27:12.8 | HIP 80662 | 14.66 |
| 2026-05-23 12:00 | 16:27:03.47 | +17:27:22.7 | HIP 80662 | 15.58 |
| 2026-05-24 00:00 | 16:26:59.49 | +17:27:32.3 | HIP 80662 | 16.50 |
| 2026-05-24 12:00 | 16:26:55.51 | +17:27:41.6 | HIP 80662 | 17.43 |
| 2026-05-25 00:00 | 16:26:51.52 | +17:27:50.5 | HIP 80662 | 18.36 |
| 2026-05-25 12:00 | 16:26:47.54 | +17:27:59.2 | HIP 80662 | 19.29 |
| 2026-05-26 00:00 | 16:26:43.55 | +17:28:07.5 | HIP 80662 | 20.23 |
| 2026-05-26 12:00 | 16:26:39.56 | +17:28:15.6 | HIP 80465 | 20.05 |
| 2026-05-27 00:00 | 16:26:35.57 | +17:28:23.3 | HIP 80465 | 19.30 |
| 2026-05-27 12:00 | 16:26:31.58 | +17:28:30.7 | HIP 80465 | 18.56 |
| 2026-05-28 00:00 | 16:26:27.58 | +17:28:37.8 | HIP 80465 | 17.85 |
| 2026-05-28 12:00 | 16:26:23.59 | +17:28:44.6 | HIP 80465 | 17.15 |
| 2026-05-29 00:00 | 16:26:19.60 | +17:28:51.1 | HIP 80465 | 16.48 |
| 2026-05-29 12:00 | 16:26:15.60 | +17:28:57.2 | HIP 80465 | 15.84 |
| 2026-05-30 00:00 | 16:26:11.61 | +17:29:03.1 | HIP 80465 | 15.22 |
| 2026-05-30 12:00 | 16:26:07.62 | +17:29:08.6 | HIP 80465 | 14.64 |
| 2026-05-31 00:00 | 16:26:03.62 | +17:29:13.8 | HIP 80465 | 14.09 |
| 2026-05-31 12:00 | 16:25:59.63 | +17:29:18.7 | HIP 80465 | 13.59 |
| 2026-06-01 00:00 | 16:25:55.65 | +17:29:23.3 | HIP 80465 | 13.13 |
| 2026-06-01 12:00 | 16:25:51.66 | +17:29:27.6 | HIP 80465 | 12.72 |
| 2026-06-02 00:00 | 16:25:47.68 | +17:29:31.5 | HIP 80465 | 12.37 |