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 |
-0.623 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
15:19:59.82 |
-23:37:33.6 |
HIP 74870 |
28.40 |
| 2026-06-03 00:00 |
15:19:48.67 |
-23:36:51.8 |
HIP 74870 |
25.76 |
| 2026-06-03 12:00 |
15:19:37.57 |
-23:36:10.0 |
HIP 74870 |
23.13 |
| 2026-06-04 00:00 |
15:19:26.54 |
-23:35:28.1 |
HIP 74870 |
20.52 |
| 2026-06-04 12:00 |
15:19:15.56 |
-23:34:46.3 |
HIP 74870 |
17.92 |
| 2026-06-05 00:00 |
15:19:04.65 |
-23:34:04.4 |
HIP 74870 |
15.34 |
| 2026-06-05 12:00 |
15:18:53.80 |
-23:33:22.5 |
HIP 74870 |
12.78 |
| 2026-06-06 00:00 |
15:18:43.01 |
-23:32:40.6 |
HIP 74870 |
10.23 |
| 2026-06-06 12:00 |
15:18:32.29 |
-23:31:58.7 |
HIP 74870 |
7.73 |
| 2026-06-07 00:00 |
15:18:21.64 |
-23:31:16.9 |
HIP 74870 |
5.27 |
| 2026-06-07 12:00 |
15:18:11.06 |
-23:30:35.0 |
HIP 74870 |
2.98 |
| 2026-06-08 00:00 |
15:18:00.54 |
-23:29:53.2 |
HIP 74870 |
1.65 |
| 2026-06-08 12:00 |
15:17:50.10 |
-23:29:11.4 |
HIP 74870 |
3.01 |
| 2026-06-09 00:00 |
15:17:39.73 |
-23:28:29.7 |
HIP 74870 |
5.26 |
| 2026-06-09 12:00 |
15:17:29.43 |
-23:27:48.0 |
HIP 74870 |
7.63 |
| 2026-06-10 00:00 |
15:17:19.21 |
-23:27:06.3 |
HIP 74870 |
10.03 |
| 2026-06-10 12:00 |
15:17:09.07 |
-23:26:24.7 |
HIP 74870 |
12.43 |
| 2026-06-11 00:00 |
15:16:59.00 |
-23:25:43.2 |
HIP 74870 |
14.82 |
| 2026-06-11 12:00 |
15:16:49.01 |
-23:25:01.8 |
HIP 74870 |
17.20 |
| 2026-06-12 00:00 |
15:16:39.11 |
-23:24:20.5 |
HIP 74870 |
19.57 |
| 2026-06-12 12:00 |
15:16:29.28 |
-23:23:39.2 |
HIP 74870 |
21.91 |
| 2026-06-13 00:00 |
15:16:19.54 |
-23:22:58.0 |
HIP 74870 |
24.24 |
| 2026-06-13 12:00 |
15:16:09.89 |
-23:22:17.0 |
HIP 74870 |
26.56 |
| 2026-06-14 00:00 |
15:16:00.32 |
-23:21:36.1 |
HIP 74870 |
28.85 |
| 2026-06-14 12:00 |
15:15:50.84 |
-23:20:55.2 |
HIP 74529 |
30.84 |
| 2026-06-15 00:00 |
15:15:41.45 |
-23:20:14.6 |
HIP 74529 |
29.13 |
| 2026-06-15 12:00 |
15:15:32.14 |
-23:19:34.0 |
HIP 74529 |
27.52 |
| 2026-06-16 00:00 |
15:15:22.93 |
-23:18:53.6 |
HIP 74529 |
26.02 |
| 2026-06-16 12:00 |
15:15:13.81 |
-23:18:13.3 |
HIP 74529 |
24.64 |
| 2026-06-17 00:00 |
15:15:04.79 |
-23:17:33.2 |
HIP 74529 |
23.40 |
| 2026-06-17 12:00 |
15:14:55.86 |
-23:16:53.3 |
HIP 74529 |
22.32 |
| 2026-06-18 00:00 |
15:14:47.03 |
-23:16:13.5 |
HIP 74529 |
21.41 |
| 2026-06-18 12:00 |
15:14:38.29 |
-23:15:33.9 |
HIP 74529 |
20.70 |
| 2026-06-19 00:00 |
15:14:29.65 |
-23:14:54.5 |
HIP 74529 |
20.18 |
| 2026-06-19 12:00 |
15:14:21.11 |
-23:14:15.3 |
HIP 74529 |
19.89 |
| 2026-06-20 00:00 |
15:14:12.67 |
-23:13:36.2 |
HIP 74529 |
19.81 |
| 2026-06-20 12:00 |
15:14:04.33 |
-23:12:57.4 |
HIP 74529 |
19.94 |
| 2026-06-21 00:00 |
15:13:56.10 |
-23:12:18.8 |
HIP 74529 |
20.27 |
| 2026-06-21 12:00 |
15:13:47.97 |
-23:11:40.3 |
HIP 74529 |
20.78 |
| 2026-06-22 00:00 |
15:13:39.94 |
-23:11:02.2 |
HIP 74529 |
21.46 |