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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 17:11:00.01 | -53:56:21.0 | HIP 83960 | 26.24 |
| 2026-03-26 12:00 | 17:10:58.66 | -53:56:41.6 | HIP 83960 | 25.84 |
| 2026-03-27 00:00 | 17:10:57.26 | -53:57:02.1 | HIP 83960 | 25.45 |
| 2026-03-27 12:00 | 17:10:55.82 | -53:57:22.5 | HIP 83960 | 25.05 |
| 2026-03-28 00:00 | 17:10:54.33 | -53:57:42.8 | HIP 83960 | 24.65 |
| 2026-03-28 12:00 | 17:10:52.81 | -53:58:03.1 | HIP 83960 | 24.25 |
| 2026-03-29 00:00 | 17:10:51.24 | -53:58:23.3 | HIP 83960 | 23.85 |
| 2026-03-29 12:00 | 17:10:49.63 | -53:58:43.3 | HIP 83960 | 23.45 |
| 2026-03-30 00:00 | 17:10:47.98 | -53:59:03.3 | HIP 83960 | 23.04 |
| 2026-03-30 12:00 | 17:10:46.29 | -53:59:23.2 | HIP 83960 | 22.64 |
| 2026-03-31 00:00 | 17:10:44.56 | -53:59:43.0 | HIP 83960 | 22.24 |
| 2026-03-31 12:00 | 17:10:42.78 | -54:00:02.8 | HIP 83960 | 21.83 |
| 2026-04-01 00:00 | 17:10:40.97 | -54:00:22.4 | HIP 83960 | 21.43 |
| 2026-04-01 12:00 | 17:10:39.11 | -54:00:41.9 | HIP 83960 | 21.02 |
| 2026-04-02 00:00 | 17:10:37.21 | -54:01:01.3 | HIP 83960 | 20.61 |
| 2026-04-02 12:00 | 17:10:35.28 | -54:01:20.7 | HIP 83960 | 20.21 |
| 2026-04-03 00:00 | 17:10:33.30 | -54:01:39.9 | HIP 83960 | 19.81 |
| 2026-04-03 12:00 | 17:10:31.28 | -54:01:59.0 | HIP 83960 | 19.40 |
| 2026-04-04 00:00 | 17:10:29.22 | -54:02:18.0 | HIP 83960 | 19.00 |
| 2026-04-04 12:00 | 17:10:27.12 | -54:02:36.9 | HIP 83960 | 18.60 |
| 2026-04-05 00:00 | 17:10:24.98 | -54:02:55.7 | HIP 83960 | 18.20 |
| 2026-04-05 12:00 | 17:10:22.81 | -54:03:14.4 | HIP 83960 | 17.80 |
| 2026-04-06 00:00 | 17:10:20.59 | -54:03:33.0 | HIP 83960 | 17.40 |
| 2026-04-06 12:00 | 17:10:18.33 | -54:03:51.4 | HIP 83960 | 17.01 |
| 2026-04-07 00:00 | 17:10:16.03 | -54:04:09.8 | HIP 83960 | 16.62 |
| 2026-04-07 12:00 | 17:10:13.69 | -54:04:28.0 | HIP 83960 | 16.23 |
| 2026-04-08 00:00 | 17:10:11.32 | -54:04:46.1 | HIP 83960 | 15.85 |
| 2026-04-08 12:00 | 17:10:08.90 | -54:05:04.1 | HIP 83960 | 15.47 |
| 2026-04-09 00:00 | 17:10:06.45 | -54:05:22.0 | HIP 83960 | 15.10 |
| 2026-04-09 12:00 | 17:10:03.96 | -54:05:39.7 | HIP 83960 | 14.74 |
| 2026-04-10 00:00 | 17:10:01.43 | -54:05:57.4 | HIP 83960 | 14.38 |
| 2026-04-10 12:00 | 17:09:58.86 | -54:06:14.9 | HIP 83960 | 14.03 |
| 2026-04-11 00:00 | 17:09:56.25 | -54:06:32.3 | HIP 83960 | 13.69 |
| 2026-04-11 12:00 | 17:09:53.60 | -54:06:49.5 | HIP 83960 | 13.36 |
| 2026-04-12 00:00 | 17:09:50.92 | -54:07:06.6 | HIP 83960 | 13.04 |
| 2026-04-12 12:00 | 17:09:48.20 | -54:07:23.6 | HIP 83960 | 12.73 |
| 2026-04-13 00:00 | 17:09:45.44 | -54:07:40.5 | HIP 83960 | 12.43 |
| 2026-04-13 12:00 | 17:09:42.64 | -54:07:57.2 | HIP 83960 | 12.15 |
| 2026-04-14 00:00 | 17:09:39.81 | -54:08:13.7 | HIP 83960 | 11.89 |
| 2026-04-14 12:00 | 17:09:36.94 | -54:08:30.2 | HIP 83960 | 11.65 |
| 2026-04-15 00:00 | 17:09:34.03 | -54:08:46.5 | HIP 83960 | 11.42 |
| 2026-04-15 12:00 | 17:09:31.09 | -54:09:02.7 | HIP 83960 | 11.22 |
| 2026-04-16 00:00 | 17:09:28.11 | -54:09:18.7 | HIP 83960 | 11.04 |