メタデータ
| 項目 |
値 |
| Designation |
P/2011 P1 (McNaught) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-07-24T04:00:53.856000Z |
| Orbit solution date (soln_date, UTC) |
2022-03-08T19:43:47Z |
| Obs used |
156 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
11.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-08-20.0000000 |
| e |
0.36688593 |
| q (au) |
4.952165 |
| a (au) |
7.821915 |
| i (deg) |
6.308803 |
| Ω (om, deg) |
10.081774 |
| ω (w, deg) |
342.119808 |
| M (ma, deg) |
17.653674 |
等級
散乱 + 全体線形
$$
M_a = (3.503 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.503 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
15:28:32.15 |
-24:05:26.6 |
HIP 75806 |
23.29 |
| 2026-05-12 12:00 |
15:28:20.00 |
-24:04:52.4 |
HIP 75806 |
24.96 |
| 2026-05-13 00:00 |
15:28:07.84 |
-24:04:17.8 |
HIP 75801 |
26.30 |
| 2026-05-13 12:00 |
15:27:55.67 |
-24:03:42.9 |
HIP 75801 |
27.41 |
| 2026-05-14 00:00 |
15:27:43.49 |
-24:03:07.8 |
HIP 75801 |
28.75 |
| 2026-05-14 12:00 |
15:27:31.31 |
-24:02:32.4 |
HIP 75617 |
29.79 |
| 2026-05-15 00:00 |
15:27:19.11 |
-24:01:56.6 |
HIP 75617 |
29.89 |
| 2026-05-15 12:00 |
15:27:06.92 |
-24:01:20.6 |
HIP 75617 |
30.25 |
| 2026-05-16 00:00 |
15:26:54.72 |
-24:00:44.4 |
HIP 75617 |
30.88 |
| 2026-05-16 12:00 |
15:26:42.52 |
-24:00:07.8 |
HIP 75478 |
29.41 |
| 2026-05-17 00:00 |
15:26:30.32 |
-23:59:31.0 |
HIP 75478 |
26.98 |
| 2026-05-17 12:00 |
15:26:18.12 |
-23:58:54.0 |
HIP 75478 |
24.63 |
| 2026-05-18 00:00 |
15:26:05.93 |
-23:58:16.7 |
HIP 75478 |
22.40 |
| 2026-05-18 12:00 |
15:25:53.75 |
-23:57:39.2 |
HIP 75478 |
20.33 |
| 2026-05-19 00:00 |
15:25:41.57 |
-23:57:01.4 |
HIP 75478 |
18.46 |
| 2026-05-19 12:00 |
15:25:29.41 |
-23:56:23.4 |
HIP 75478 |
16.87 |
| 2026-05-20 00:00 |
15:25:17.25 |
-23:55:45.2 |
HIP 75478 |
15.64 |
| 2026-05-20 12:00 |
15:25:05.12 |
-23:55:06.8 |
HIP 75478 |
14.86 |
| 2026-05-21 00:00 |
15:24:52.99 |
-23:54:28.2 |
HIP 75478 |
14.59 |
| 2026-05-21 12:00 |
15:24:40.89 |
-23:53:49.3 |
HIP 75478 |
14.87 |
| 2026-05-22 00:00 |
15:24:28.80 |
-23:53:10.3 |
HIP 75478 |
15.67 |
| 2026-05-22 12:00 |
15:24:16.74 |
-23:52:31.1 |
HIP 75329 |
16.90 |
| 2026-05-23 00:00 |
15:24:04.69 |
-23:51:51.7 |
HIP 75329 |
15.84 |
| 2026-05-23 12:00 |
15:23:52.68 |
-23:51:12.1 |
HIP 75329 |
15.25 |
| 2026-05-24 00:00 |
15:23:40.68 |
-23:50:32.4 |
HIP 75329 |
15.17 |
| 2026-05-24 12:00 |
15:23:28.72 |
-23:49:52.5 |
HIP 75329 |
15.61 |
| 2026-05-25 00:00 |
15:23:16.78 |
-23:49:12.4 |
HIP 75329 |
16.53 |
| 2026-05-25 12:00 |
15:23:04.88 |
-23:48:32.2 |
HIP 75329 |
17.85 |
| 2026-05-26 00:00 |
15:22:53.01 |
-23:47:51.9 |
HIP 75329 |
19.48 |
| 2026-05-26 12:00 |
15:22:41.17 |
-23:47:11.4 |
HIP 75329 |
21.35 |
| 2026-05-27 00:00 |
15:22:29.36 |
-23:46:30.7 |
HIP 75329 |
23.41 |
| 2026-05-27 12:00 |
15:22:17.60 |
-23:45:50.0 |
HIP 75329 |
25.59 |
| 2026-05-28 00:00 |
15:22:05.87 |
-23:45:09.1 |
HIP 75329 |
27.88 |
| 2026-05-28 12:00 |
15:21:54.18 |
-23:44:28.1 |
HIP 75329 |
30.24 |
| 2026-05-29 00:00 |
15:21:42.53 |
-23:43:47.1 |
HIP 75329 |
32.66 |
| 2026-05-29 12:00 |
15:21:30.93 |
-23:43:05.9 |
HIP 75329 |
35.12 |
| 2026-05-30 00:00 |
15:21:19.37 |
-23:42:24.6 |
HIP 75329 |
37.62 |
| 2026-05-30 12:00 |
15:21:07.86 |
-23:41:43.2 |
HIP 75012 |
39.84 |
| 2026-05-31 00:00 |
15:20:56.39 |
-23:41:01.8 |
HIP 75012 |
39.22 |
| 2026-05-31 12:00 |
15:20:44.97 |
-23:40:20.3 |
HIP 75012 |
38.77 |
| 2026-06-01 00:00 |
15:20:33.60 |
-23:39:38.7 |
HIP 74870 |
36.40 |
| 2026-06-01 12:00 |
15:20:22.29 |
-23:38:57.0 |
HIP 74870 |
33.73 |
| 2026-06-02 00:00 |
15:20:11.03 |
-23:38:15.3 |
HIP 74870 |
31.06 |