C/2006 P1 (McNaught)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2006 P1 (McNaught) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2007-01-12T19:10:20.087040Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:30:59Z |
| Obs used | 331 |
| NEO | - |
| M1 | 5.400 |
| K1 | 20.750 |
| PC | 0.030 |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2006-11-26.0000000 |
| e | 1.00001882 |
| q (au) | 0.170736 |
| a (au) | -9074.061069 |
| i (deg) | 77.837001 |
| Ω (om, deg) | 267.414803 |
| ω (w, deg) | 155.974968 |
| M (ma, deg) | -0.000055 |
等級
散乱 + 全体線形
$$ M_a = (6.650 + 5.259\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 6.650 |
| n | 5.259 |
| gf | 0.800 |
| gb | -0.500 |
| k | 1.000 |
| δ90 | 1.000 |
| 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 |
|---|---|---|---|
| 2006-08-07 | 2006-10-09 | +16.8994 | -5.727 |
| 2006-10-09 | 2006-12-24 | +2.3930 | -1.220 |
| 2006-12-24 | 2007-01-09 | -3.1120 | -1.827 |
| 2007-01-09 | 2007-01-12 | -0.3863 | +0.233 |
| 2007-01-12 | 2007-07-11 | -2.7439 | -1.992 |
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 | 17:06:10.14 | -54:19:23.4 | HIP 83960 | 31.18 |
| 2026-05-12 12:00 | 17:06:05.65 | -54:19:30.2 | HIP 83960 | 31.83 |
| 2026-05-13 00:00 | 17:06:01.14 | -54:19:36.7 | HIP 83402 | 31.89 |
| 2026-05-13 12:00 | 17:05:56.61 | -54:19:43.0 | HIP 83402 | 31.25 |
| 2026-05-14 00:00 | 17:05:52.06 | -54:19:49.2 | HIP 83402 | 30.61 |
| 2026-05-14 12:00 | 17:05:47.49 | -54:19:55.1 | HIP 83402 | 29.98 |
| 2026-05-15 00:00 | 17:05:42.90 | -54:20:00.8 | HIP 83402 | 29.34 |
| 2026-05-15 12:00 | 17:05:38.29 | -54:20:06.4 | HIP 83402 | 28.70 |
| 2026-05-16 00:00 | 17:05:33.67 | -54:20:11.7 | HIP 83402 | 28.07 |
| 2026-05-16 12:00 | 17:05:29.02 | -54:20:16.8 | HIP 83402 | 27.44 |
| 2026-05-17 00:00 | 17:05:24.36 | -54:20:21.7 | HIP 83402 | 26.81 |
| 2026-05-17 12:00 | 17:05:19.69 | -54:20:26.4 | HIP 83402 | 26.18 |
| 2026-05-18 00:00 | 17:05:15.00 | -54:20:30.9 | HIP 83402 | 25.56 |
| 2026-05-18 12:00 | 17:05:10.29 | -54:20:35.2 | HIP 83402 | 24.93 |
| 2026-05-19 00:00 | 17:05:05.57 | -54:20:39.3 | HIP 83402 | 24.32 |
| 2026-05-19 12:00 | 17:05:00.83 | -54:20:43.2 | HIP 83402 | 23.70 |
| 2026-05-20 00:00 | 17:04:56.08 | -54:20:46.8 | HIP 83402 | 23.09 |
| 2026-05-20 12:00 | 17:04:51.31 | -54:20:50.3 | HIP 83402 | 22.49 |
| 2026-05-21 00:00 | 17:04:46.53 | -54:20:53.5 | HIP 83402 | 21.89 |
| 2026-05-21 12:00 | 17:04:41.74 | -54:20:56.6 | HIP 83402 | 21.30 |
| 2026-05-22 00:00 | 17:04:36.93 | -54:20:59.4 | HIP 83402 | 20.71 |
| 2026-05-22 12:00 | 17:04:32.11 | -54:21:02.0 | HIP 83402 | 20.13 |
| 2026-05-23 00:00 | 17:04:27.28 | -54:21:04.4 | HIP 83402 | 19.57 |
| 2026-05-23 12:00 | 17:04:22.44 | -54:21:06.6 | HIP 83402 | 19.01 |
| 2026-05-24 00:00 | 17:04:17.58 | -54:21:08.6 | HIP 83402 | 18.46 |
| 2026-05-24 12:00 | 17:04:12.72 | -54:21:10.3 | HIP 83402 | 17.93 |
| 2026-05-25 00:00 | 17:04:07.85 | -54:21:11.9 | HIP 83402 | 17.41 |
| 2026-05-25 12:00 | 17:04:02.96 | -54:21:13.3 | HIP 83402 | 16.91 |
| 2026-05-26 00:00 | 17:03:58.07 | -54:21:14.4 | HIP 83402 | 16.42 |
| 2026-05-26 12:00 | 17:03:53.16 | -54:21:15.3 | HIP 83402 | 15.95 |
| 2026-05-27 00:00 | 17:03:48.25 | -54:21:16.0 | HIP 83402 | 15.50 |
| 2026-05-27 12:00 | 17:03:43.33 | -54:21:16.6 | HIP 83402 | 15.08 |
| 2026-05-28 00:00 | 17:03:38.40 | -54:21:16.8 | HIP 83402 | 14.68 |
| 2026-05-28 12:00 | 17:03:33.46 | -54:21:16.9 | HIP 83402 | 14.30 |
| 2026-05-29 00:00 | 17:03:28.51 | -54:21:16.8 | HIP 83402 | 13.96 |
| 2026-05-29 12:00 | 17:03:23.56 | -54:21:16.5 | HIP 83402 | 13.65 |
| 2026-05-30 00:00 | 17:03:18.60 | -54:21:15.9 | HIP 83402 | 13.37 |
| 2026-05-30 12:00 | 17:03:13.64 | -54:21:15.1 | HIP 83402 | 13.13 |
| 2026-05-31 00:00 | 17:03:08.67 | -54:21:14.2 | HIP 83402 | 12.93 |
| 2026-05-31 12:00 | 17:03:03.69 | -54:21:13.0 | HIP 83402 | 12.77 |
| 2026-06-01 00:00 | 17:02:58.71 | -54:21:11.6 | HIP 83402 | 12.65 |
| 2026-06-01 12:00 | 17:02:53.72 | -54:21:10.0 | HIP 83402 | 12.58 |
| 2026-06-02 00:00 | 17:02:48.73 | -54:21:08.2 | HIP 83402 | 12.55 |