メタデータ
| 項目 |
値 |
| Designation |
C/2011 Q2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-01-19T18:55:25.829760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:55Z |
| Obs used |
106 |
| NEO |
- |
| M1 |
4.700 |
| K1 |
23.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-09-16.0000000 |
| e |
1.00007496 |
| q (au) |
1.349561 |
| a (au) |
-18003.301883 |
| i (deg) |
36.866576 |
| Ω (om, deg) |
287.369526 |
| ω (w, deg) |
34.628570 |
| M (ma, deg) |
-0.000051 |
等級
散乱 + 全体線形
$$
M_a = (10.734 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.734 |
| n |
2.000 |
| 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) |
| 2026-07-29 00:00 |
07:48:46.45 |
+14:21:24.0 |
HIP 38202 |
18.18 |
| 2026-07-29 12:00 |
07:48:50.08 |
+14:21:11.4 |
HIP 38202 |
17.44 |
| 2026-07-30 00:00 |
07:48:53.71 |
+14:20:58.7 |
HIP 38202 |
16.72 |
| 2026-07-30 12:00 |
07:48:57.34 |
+14:20:46.1 |
HIP 38202 |
16.02 |
| 2026-07-31 00:00 |
07:49:00.95 |
+14:20:33.4 |
HIP 38202 |
15.34 |
| 2026-07-31 12:00 |
07:49:04.56 |
+14:20:20.6 |
HIP 38202 |
14.68 |
| 2026-08-01 00:00 |
07:49:08.17 |
+14:20:07.8 |
HIP 38202 |
14.06 |
| 2026-08-01 12:00 |
07:49:11.76 |
+14:19:55.0 |
HIP 38202 |
13.46 |
| 2026-08-02 00:00 |
07:49:15.35 |
+14:19:42.2 |
HIP 38202 |
12.90 |
| 2026-08-02 12:00 |
07:49:18.94 |
+14:19:29.3 |
HIP 38202 |
12.37 |
| 2026-08-03 00:00 |
07:49:22.51 |
+14:19:16.3 |
HIP 38202 |
11.89 |
| 2026-08-03 12:00 |
07:49:26.08 |
+14:19:03.4 |
HIP 38202 |
11.46 |
| 2026-08-04 00:00 |
07:49:29.64 |
+14:18:50.4 |
HIP 38202 |
11.09 |
| 2026-08-04 12:00 |
07:49:33.19 |
+14:18:37.4 |
HIP 38202 |
10.78 |
| 2026-08-05 00:00 |
07:49:36.73 |
+14:18:24.3 |
HIP 38202 |
10.53 |
| 2026-08-05 12:00 |
07:49:40.27 |
+14:18:11.2 |
HIP 38202 |
10.35 |
| 2026-08-06 00:00 |
07:49:43.79 |
+14:17:58.1 |
HIP 38202 |
10.24 |
| 2026-08-06 12:00 |
07:49:47.31 |
+14:17:45.0 |
HIP 38202 |
10.21 |
| 2026-08-07 00:00 |
07:49:50.81 |
+14:17:31.8 |
HIP 38202 |
10.25 |
| 2026-08-07 12:00 |
07:49:54.31 |
+14:17:18.6 |
HIP 38202 |
10.36 |
| 2026-08-08 00:00 |
07:49:57.80 |
+14:17:05.4 |
HIP 38202 |
10.55 |
| 2026-08-08 12:00 |
07:50:01.27 |
+14:16:52.1 |
HIP 38202 |
10.80 |
| 2026-08-09 00:00 |
07:50:04.74 |
+14:16:38.8 |
HIP 38202 |
11.11 |
| 2026-08-09 12:00 |
07:50:08.20 |
+14:16:25.5 |
HIP 38202 |
11.47 |
| 2026-08-10 00:00 |
07:50:11.64 |
+14:16:12.2 |
HIP 38202 |
11.89 |
| 2026-08-10 12:00 |
07:50:15.08 |
+14:15:58.8 |
HIP 38202 |
12.35 |
| 2026-08-11 00:00 |
07:50:18.50 |
+14:15:45.4 |
HIP 38202 |
12.85 |
| 2026-08-11 12:00 |
07:50:21.91 |
+14:15:32.0 |
HIP 38202 |
13.39 |
| 2026-08-12 00:00 |
07:50:25.31 |
+14:15:18.6 |
HIP 38202 |
13.95 |
| 2026-08-12 12:00 |
07:50:28.70 |
+14:15:05.2 |
HIP 38360 |
14.30 |
| 2026-08-13 00:00 |
07:50:32.08 |
+14:14:51.7 |
HIP 38360 |
13.45 |
| 2026-08-13 12:00 |
07:50:35.44 |
+14:14:38.2 |
HIP 38360 |
12.61 |
| 2026-08-14 00:00 |
07:50:38.79 |
+14:14:24.7 |
HIP 38360 |
11.77 |
| 2026-08-14 12:00 |
07:50:42.13 |
+14:14:11.2 |
HIP 38360 |
10.93 |
| 2026-08-15 00:00 |
07:50:45.46 |
+14:13:57.7 |
HIP 38360 |
10.10 |
| 2026-08-15 12:00 |
07:50:48.77 |
+14:13:44.1 |
HIP 38360 |
9.27 |
| 2026-08-16 00:00 |
07:50:52.07 |
+14:13:30.6 |
HIP 38360 |
8.45 |
| 2026-08-16 12:00 |
07:50:55.35 |
+14:13:17.0 |
HIP 38360 |
7.63 |
| 2026-08-17 00:00 |
07:50:58.62 |
+14:13:03.4 |
HIP 38360 |
6.81 |
| 2026-08-17 12:00 |
07:51:01.88 |
+14:12:49.8 |
HIP 38360 |
6.00 |
| 2026-08-18 00:00 |
07:51:05.12 |
+14:12:36.2 |
HIP 38360 |
5.20 |
| 2026-08-18 12:00 |
07:51:08.34 |
+14:12:22.6 |
HIP 38360 |
4.40 |
| 2026-08-19 00:00 |
07:51:11.56 |
+14:12:09.0 |
HIP 38360 |
3.61 |