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
$$ M_a = (8.624 + 5.369\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 8.624 |
| n | 5.369 |
| gf | 1.000 |
| gb | -0.915 |
| k | 0.813 |
| 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 |
|---|---|---|---|
| 2011-05-21 | 2012-04-20 | +8.0084 | -7.084 |
| 2012-04-20 | 2012-07-06 | +11.5536 | -8.429 |
| 2012-07-06 | 2013-03-09 | -1.5964 | -1.500 |
| 2013-03-10 | 2013-04-20 | +2.6709 | -0.237 |
| 2013-04-20 | 2014-08-27 | +0.9078 | -0.681 |
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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 16:33:03.52 | +15:42:54.3 | HIP 81059 | 34.81 |
| 2026-02-03 12:00 | 16:33:05.25 | +15:43:22.0 | HIP 81224 | 35.12 |
| 2026-02-04 00:00 | 16:33:06.96 | +15:43:49.8 | HIP 81224 | 34.88 |
| 2026-02-04 12:00 | 16:33:08.63 | +15:44:17.8 | HIP 81224 | 34.66 |
| 2026-02-05 00:00 | 16:33:10.27 | +15:44:46.0 | HIP 81224 | 34.46 |
| 2026-02-05 12:00 | 16:33:11.89 | +15:45:14.4 | HIP 81224 | 34.27 |
| 2026-02-06 00:00 | 16:33:13.47 | +15:45:43.0 | HIP 81224 | 34.10 |
| 2026-02-06 12:00 | 16:33:15.02 | +15:46:11.7 | HIP 81224 | 33.95 |
| 2026-02-07 00:00 | 16:33:16.53 | +15:46:40.7 | HIP 81224 | 33.82 |
| 2026-02-07 12:00 | 16:33:18.02 | +15:47:09.8 | HIP 81224 | 33.71 |
| 2026-02-08 00:00 | 16:33:19.47 | +15:47:39.1 | HIP 81224 | 33.61 |
| 2026-02-08 12:00 | 16:33:20.90 | +15:48:08.6 | HIP 81224 | 33.54 |
| 2026-02-09 00:00 | 16:33:22.29 | +15:48:38.3 | HIP 81224 | 33.48 |
| 2026-02-09 12:00 | 16:33:23.64 | +15:49:08.1 | HIP 81224 | 33.44 |
| 2026-02-10 00:00 | 16:33:24.97 | +15:49:38.1 | HIP 81224 | 33.42 |
| 2026-02-10 12:00 | 16:33:26.26 | +15:50:08.3 | HIP 81224 | 33.42 |
| 2026-02-11 00:00 | 16:33:27.53 | +15:50:38.6 | HIP 81224 | 33.44 |
| 2026-02-11 12:00 | 16:33:28.75 | +15:51:09.1 | HIP 81224 | 33.47 |
| 2026-02-12 00:00 | 16:33:29.95 | +15:51:39.7 | HIP 81224 | 33.53 |
| 2026-02-12 12:00 | 16:33:31.11 | +15:52:10.6 | HIP 81224 | 33.60 |
| 2026-02-13 00:00 | 16:33:32.24 | +15:52:41.5 | HIP 81224 | 33.69 |
| 2026-02-13 12:00 | 16:33:33.34 | +15:53:12.7 | HIP 81224 | 33.80 |
| 2026-02-14 00:00 | 16:33:34.40 | +15:53:43.9 | HIP 81224 | 33.92 |
| 2026-02-14 12:00 | 16:33:35.43 | +15:54:15.4 | HIP 81224 | 34.06 |
| 2026-02-15 00:00 | 16:33:36.43 | +15:54:46.9 | HIP 81224 | 34.22 |
| 2026-02-15 12:00 | 16:33:37.39 | +15:55:18.6 | HIP 81224 | 34.40 |
| 2026-02-16 00:00 | 16:33:38.32 | +15:55:50.5 | HIP 81224 | 34.59 |
| 2026-02-16 12:00 | 16:33:39.21 | +15:56:22.5 | HIP 81224 | 34.80 |
| 2026-02-17 00:00 | 16:33:40.07 | +15:56:54.6 | HIP 81224 | 35.02 |
| 2026-02-17 12:00 | 16:33:40.90 | +15:57:26.9 | HIP 81224 | 35.26 |
| 2026-02-18 00:00 | 16:33:41.69 | +15:57:59.3 | HIP 81224 | 35.52 |
| 2026-02-18 12:00 | 16:33:42.45 | +15:58:31.8 | HIP 81035 | 35.50 |
| 2026-02-19 00:00 | 16:33:43.18 | +15:59:04.5 | HIP 81035 | 35.02 |
| 2026-02-19 12:00 | 16:33:43.87 | +15:59:37.3 | HIP 81035 | 34.55 |
| 2026-02-20 00:00 | 16:33:44.53 | +16:00:10.1 | HIP 81035 | 34.07 |
| 2026-02-20 12:00 | 16:33:45.15 | +16:00:43.2 | HIP 81035 | 33.59 |
| 2026-02-21 00:00 | 16:33:45.73 | +16:01:16.3 | HIP 81035 | 33.11 |
| 2026-02-21 12:00 | 16:33:46.29 | +16:01:49.5 | HIP 81035 | 32.63 |
| 2026-02-22 00:00 | 16:33:46.81 | +16:02:22.9 | HIP 81035 | 32.15 |
| 2026-02-22 12:00 | 16:33:47.29 | +16:02:56.3 | HIP 81035 | 31.67 |
| 2026-02-23 00:00 | 16:33:47.74 | +16:03:29.9 | HIP 81035 | 31.18 |
| 2026-02-23 12:00 | 16:33:48.15 | +16:04:03.5 | HIP 81035 | 30.69 |
| 2026-02-24 00:00 | 16:33:48.53 | +16:04:37.3 | HIP 81035 | 30.20 |