メタデータ
| 項目 |
値 |
| Designation |
C/2013 E1 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-06-12T02:48:47.306880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:31Z |
| Obs used |
172 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
8.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-06-11.0000000 |
| e |
1.00225843 |
| q (au) |
7.781630 |
| a (au) |
-3445.585444 |
| i (deg) |
158.720377 |
| Ω (om, deg) |
134.028821 |
| ω (w, deg) |
311.425764 |
| M (ma, deg) |
-0.000005 |
等級
散乱 + 全体線形
$$
M_a = (5.562 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.562 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.823 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
04:24:55.55 |
+40:16:52.4 |
HIP 20775 |
24.24 |
| 2026-06-01 12:00 |
04:25:00.34 |
+40:17:03.3 |
HIP 20775 |
23.32 |
| 2026-06-02 00:00 |
04:25:05.13 |
+40:17:14.4 |
HIP 20775 |
22.40 |
| 2026-06-02 12:00 |
04:25:09.92 |
+40:17:25.6 |
HIP 20775 |
21.48 |
| 2026-06-03 00:00 |
04:25:14.70 |
+40:17:36.9 |
HIP 20775 |
20.57 |
| 2026-06-03 12:00 |
04:25:19.48 |
+40:17:48.5 |
HIP 20775 |
19.65 |
| 2026-06-04 00:00 |
04:25:24.25 |
+40:18:00.2 |
HIP 20775 |
18.74 |
| 2026-06-04 12:00 |
04:25:29.02 |
+40:18:12.0 |
HIP 20775 |
17.83 |
| 2026-06-05 00:00 |
04:25:33.79 |
+40:18:24.0 |
HIP 20775 |
16.93 |
| 2026-06-05 12:00 |
04:25:38.55 |
+40:18:36.2 |
HIP 20775 |
16.03 |
| 2026-06-06 00:00 |
04:25:43.31 |
+40:18:48.5 |
HIP 20775 |
15.13 |
| 2026-06-06 12:00 |
04:25:48.06 |
+40:19:00.9 |
HIP 20775 |
14.24 |
| 2026-06-07 00:00 |
04:25:52.80 |
+40:19:13.5 |
HIP 20775 |
13.36 |
| 2026-06-07 12:00 |
04:25:57.54 |
+40:19:26.3 |
HIP 20775 |
12.48 |
| 2026-06-08 00:00 |
04:26:02.27 |
+40:19:39.2 |
HIP 20775 |
11.62 |
| 2026-06-08 12:00 |
04:26:06.99 |
+40:19:52.3 |
HIP 20775 |
10.77 |
| 2026-06-09 00:00 |
04:26:11.71 |
+40:20:05.5 |
HIP 20775 |
9.93 |
| 2026-06-09 12:00 |
04:26:16.42 |
+40:20:18.9 |
HIP 20775 |
9.11 |
| 2026-06-10 00:00 |
04:26:21.12 |
+40:20:32.4 |
HIP 20775 |
8.32 |
| 2026-06-10 12:00 |
04:26:25.82 |
+40:20:46.1 |
HIP 20775 |
7.55 |
| 2026-06-11 00:00 |
04:26:30.50 |
+40:21:00.0 |
HIP 20775 |
6.84 |
| 2026-06-11 12:00 |
04:26:35.18 |
+40:21:13.9 |
HIP 20775 |
6.17 |
| 2026-06-12 00:00 |
04:26:39.84 |
+40:21:28.0 |
HIP 20775 |
5.59 |
| 2026-06-12 12:00 |
04:26:44.50 |
+40:21:42.3 |
HIP 20775 |
5.11 |
| 2026-06-13 00:00 |
04:26:49.15 |
+40:21:56.7 |
HIP 20775 |
4.76 |
| 2026-06-13 12:00 |
04:26:53.78 |
+40:22:11.2 |
HIP 20775 |
4.57 |
| 2026-06-14 00:00 |
04:26:58.41 |
+40:22:25.9 |
HIP 20775 |
4.57 |
| 2026-06-14 12:00 |
04:27:03.02 |
+40:22:40.7 |
HIP 20775 |
4.75 |
| 2026-06-15 00:00 |
04:27:07.62 |
+40:22:55.7 |
HIP 20775 |
5.09 |
| 2026-06-15 12:00 |
04:27:12.21 |
+40:23:10.8 |
HIP 20775 |
5.56 |
| 2026-06-16 00:00 |
04:27:16.79 |
+40:23:26.1 |
HIP 20775 |
6.14 |
| 2026-06-16 12:00 |
04:27:21.35 |
+40:23:41.4 |
HIP 20775 |
6.78 |
| 2026-06-17 00:00 |
04:27:25.90 |
+40:23:57.0 |
HIP 20775 |
7.49 |
| 2026-06-17 12:00 |
04:27:30.44 |
+40:24:12.6 |
HIP 20775 |
8.23 |
| 2026-06-18 00:00 |
04:27:34.96 |
+40:24:28.4 |
HIP 20775 |
9.00 |
| 2026-06-18 12:00 |
04:27:39.47 |
+40:24:44.4 |
HIP 20775 |
9.79 |
| 2026-06-19 00:00 |
04:27:43.96 |
+40:25:00.4 |
HIP 20775 |
10.60 |
| 2026-06-19 12:00 |
04:27:48.44 |
+40:25:16.6 |
HIP 20775 |
11.42 |
| 2026-06-20 00:00 |
04:27:52.90 |
+40:25:32.9 |
HIP 20775 |
12.25 |
| 2026-06-20 12:00 |
04:27:57.35 |
+40:25:49.4 |
HIP 20775 |
13.09 |
| 2026-06-21 00:00 |
04:28:01.78 |
+40:26:06.0 |
HIP 20775 |
13.93 |
| 2026-06-21 12:00 |
04:28:06.20 |
+40:26:22.7 |
HIP 20775 |
14.78 |
| 2026-06-22 00:00 |
04:28:10.59 |
+40:26:39.5 |
HIP 20775 |
15.63 |