メタデータ
| 項目 |
値 |
| Designation |
C/2011 C1 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-04-18T00:03:10.460160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:48Z |
| Obs used |
613 |
| NEO |
- |
| M1 |
12.700 |
| K1 |
17.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-04-15.0000000 |
| e |
0.99743318 |
| q (au) |
0.883378 |
| a (au) |
344.152599 |
| i (deg) |
16.825617 |
| Ω (om, deg) |
192.438367 |
| ω (w, deg) |
84.473509 |
| M (ma, deg) |
359.999537 |
等級
散乱 + 全体線形
$$
M_a = (14.233 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.233 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.772 |
| k |
0.800 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2011-01-14 |
2011-03-19 |
+10.0801 |
-0.697 |
| 2011-03-19 |
2011-04-17 |
+45.5484 |
-0.310 |
| 2011-04-18 |
2011-06-07 |
-12.9367 |
-3.109 |
| 2011-06-07 |
2011-08-07 |
-10.1926 |
-2.073 |
| 2011-08-07 |
2011-11-18 |
+22.7627 |
-11.126 |
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) |
| 2026-07-29 00:00 |
05:17:11.67 |
+08:19:39.0 |
HIP 24703 |
17.46 |
| 2026-07-29 12:00 |
05:17:14.18 |
+08:19:32.0 |
HIP 24703 |
16.98 |
| 2026-07-30 00:00 |
05:17:16.66 |
+08:19:25.0 |
HIP 24703 |
16.50 |
| 2026-07-30 12:00 |
05:17:19.13 |
+08:19:17.8 |
HIP 24703 |
16.05 |
| 2026-07-31 00:00 |
05:17:21.57 |
+08:19:10.5 |
HIP 24703 |
15.60 |
| 2026-07-31 12:00 |
05:17:23.99 |
+08:19:03.2 |
HIP 24703 |
15.17 |
| 2026-08-01 00:00 |
05:17:26.40 |
+08:18:55.7 |
HIP 24703 |
14.75 |
| 2026-08-01 12:00 |
05:17:28.78 |
+08:18:48.2 |
HIP 24703 |
14.34 |
| 2026-08-02 00:00 |
05:17:31.14 |
+08:18:40.5 |
HIP 24703 |
13.95 |
| 2026-08-02 12:00 |
05:17:33.48 |
+08:18:32.7 |
HIP 24703 |
13.58 |
| 2026-08-03 00:00 |
05:17:35.80 |
+08:18:24.9 |
HIP 24703 |
13.22 |
| 2026-08-03 12:00 |
05:17:38.09 |
+08:18:16.9 |
HIP 24703 |
12.88 |
| 2026-08-04 00:00 |
05:17:40.37 |
+08:18:08.9 |
HIP 24703 |
12.56 |
| 2026-08-04 12:00 |
05:17:42.62 |
+08:18:00.7 |
HIP 24703 |
12.26 |
| 2026-08-05 00:00 |
05:17:44.85 |
+08:17:52.5 |
HIP 24703 |
11.98 |
| 2026-08-05 12:00 |
05:17:47.06 |
+08:17:44.2 |
HIP 24703 |
11.72 |
| 2026-08-06 00:00 |
05:17:49.24 |
+08:17:35.7 |
HIP 24703 |
11.48 |
| 2026-08-06 12:00 |
05:17:51.41 |
+08:17:27.2 |
HIP 24703 |
11.26 |
| 2026-08-07 00:00 |
05:17:53.55 |
+08:17:18.6 |
HIP 24703 |
11.06 |
| 2026-08-07 12:00 |
05:17:55.66 |
+08:17:09.9 |
HIP 24703 |
10.89 |
| 2026-08-08 00:00 |
05:17:57.76 |
+08:17:01.1 |
HIP 24703 |
10.74 |
| 2026-08-08 12:00 |
05:17:59.83 |
+08:16:52.2 |
HIP 24703 |
10.61 |
| 2026-08-09 00:00 |
05:18:01.88 |
+08:16:43.2 |
HIP 24703 |
10.50 |
| 2026-08-09 12:00 |
05:18:03.90 |
+08:16:34.1 |
HIP 24703 |
10.42 |
| 2026-08-10 00:00 |
05:18:05.90 |
+08:16:24.9 |
HIP 24703 |
10.37 |
| 2026-08-10 12:00 |
05:18:07.88 |
+08:16:15.6 |
HIP 24703 |
10.33 |
| 2026-08-11 00:00 |
05:18:09.83 |
+08:16:06.3 |
HIP 24703 |
10.32 |
| 2026-08-11 12:00 |
05:18:11.76 |
+08:15:56.8 |
HIP 24703 |
10.33 |
| 2026-08-12 00:00 |
05:18:13.66 |
+08:15:47.3 |
HIP 24703 |
10.35 |
| 2026-08-12 12:00 |
05:18:15.54 |
+08:15:37.7 |
HIP 24703 |
10.40 |
| 2026-08-13 00:00 |
05:18:17.39 |
+08:15:27.9 |
HIP 24703 |
10.47 |
| 2026-08-13 12:00 |
05:18:19.22 |
+08:15:18.1 |
HIP 24703 |
10.56 |
| 2026-08-14 00:00 |
05:18:21.02 |
+08:15:08.3 |
HIP 24703 |
10.66 |
| 2026-08-14 12:00 |
05:18:22.80 |
+08:14:58.3 |
HIP 24703 |
10.77 |
| 2026-08-15 00:00 |
05:18:24.56 |
+08:14:48.2 |
HIP 24703 |
10.90 |
| 2026-08-15 12:00 |
05:18:26.28 |
+08:14:38.1 |
HIP 24703 |
11.05 |
| 2026-08-16 00:00 |
05:18:27.99 |
+08:14:27.9 |
HIP 24703 |
11.20 |
| 2026-08-16 12:00 |
05:18:29.66 |
+08:14:17.6 |
HIP 24703 |
11.37 |
| 2026-08-17 00:00 |
05:18:31.32 |
+08:14:07.2 |
HIP 24703 |
11.54 |
| 2026-08-17 12:00 |
05:18:32.94 |
+08:13:56.7 |
HIP 24703 |
11.73 |
| 2026-08-18 00:00 |
05:18:34.54 |
+08:13:46.1 |
HIP 24703 |
11.92 |
| 2026-08-18 12:00 |
05:18:36.11 |
+08:13:35.5 |
HIP 24703 |
12.12 |
| 2026-08-19 00:00 |
05:18:37.66 |
+08:13:24.8 |
HIP 24703 |
12.32 |