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 |
0.996 |
| 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) |
| 2026-05-12 00:00 |
04:21:45.85 |
+40:11:56.5 |
HIP 20395 |
16.13 |
| 2026-05-12 12:00 |
04:21:50.45 |
+40:12:00.4 |
HIP 20395 |
16.06 |
| 2026-05-13 00:00 |
04:21:55.06 |
+40:12:04.5 |
HIP 20395 |
16.05 |
| 2026-05-13 12:00 |
04:21:59.69 |
+40:12:08.8 |
HIP 20395 |
16.09 |
| 2026-05-14 00:00 |
04:22:04.32 |
+40:12:13.2 |
HIP 20395 |
16.18 |
| 2026-05-14 12:00 |
04:22:08.97 |
+40:12:17.9 |
HIP 20395 |
16.33 |
| 2026-05-15 00:00 |
04:22:13.63 |
+40:12:22.7 |
HIP 20395 |
16.52 |
| 2026-05-15 12:00 |
04:22:18.30 |
+40:12:27.7 |
HIP 20395 |
16.77 |
| 2026-05-16 00:00 |
04:22:22.98 |
+40:12:32.9 |
HIP 20395 |
17.06 |
| 2026-05-16 12:00 |
04:22:27.66 |
+40:12:38.3 |
HIP 20395 |
17.39 |
| 2026-05-17 00:00 |
04:22:32.36 |
+40:12:43.9 |
HIP 20395 |
17.77 |
| 2026-05-17 12:00 |
04:22:37.06 |
+40:12:49.6 |
HIP 20395 |
18.19 |
| 2026-05-18 00:00 |
04:22:41.78 |
+40:12:55.5 |
HIP 20395 |
18.65 |
| 2026-05-18 12:00 |
04:22:46.50 |
+40:13:01.7 |
HIP 20395 |
19.14 |
| 2026-05-19 00:00 |
04:22:51.23 |
+40:13:07.9 |
HIP 20395 |
19.66 |
| 2026-05-19 12:00 |
04:22:55.96 |
+40:13:14.4 |
HIP 20395 |
20.22 |
| 2026-05-20 00:00 |
04:23:00.71 |
+40:13:21.1 |
HIP 20395 |
20.81 |
| 2026-05-20 12:00 |
04:23:05.46 |
+40:13:27.9 |
HIP 20395 |
21.42 |
| 2026-05-21 00:00 |
04:23:10.21 |
+40:13:34.9 |
HIP 20395 |
22.05 |
| 2026-05-21 12:00 |
04:23:14.97 |
+40:13:42.1 |
HIP 20395 |
22.71 |
| 2026-05-22 00:00 |
04:23:19.73 |
+40:13:49.4 |
HIP 20395 |
23.38 |
| 2026-05-22 12:00 |
04:23:24.50 |
+40:13:57.0 |
HIP 20395 |
24.08 |
| 2026-05-23 00:00 |
04:23:29.28 |
+40:14:04.7 |
HIP 20395 |
24.79 |
| 2026-05-23 12:00 |
04:23:34.06 |
+40:14:12.5 |
HIP 20395 |
25.52 |
| 2026-05-24 00:00 |
04:23:38.84 |
+40:14:20.6 |
HIP 20395 |
26.27 |
| 2026-05-24 12:00 |
04:23:43.62 |
+40:14:28.8 |
HIP 20395 |
27.02 |
| 2026-05-25 00:00 |
04:23:48.41 |
+40:14:37.2 |
HIP 20395 |
27.79 |
| 2026-05-25 12:00 |
04:23:53.20 |
+40:14:45.8 |
HIP 20395 |
28.58 |
| 2026-05-26 00:00 |
04:23:57.99 |
+40:14:54.5 |
HIP 20395 |
29.37 |
| 2026-05-26 12:00 |
04:24:02.79 |
+40:15:03.4 |
HIP 20395 |
30.17 |
| 2026-05-27 00:00 |
04:24:07.59 |
+40:15:12.5 |
HIP 20395 |
30.98 |
| 2026-05-27 12:00 |
04:24:12.38 |
+40:15:21.8 |
HIP 20395 |
31.80 |
| 2026-05-28 00:00 |
04:24:17.18 |
+40:15:31.2 |
HIP 20775 |
31.63 |
| 2026-05-28 12:00 |
04:24:21.98 |
+40:15:40.8 |
HIP 20775 |
30.71 |
| 2026-05-29 00:00 |
04:24:26.78 |
+40:15:50.5 |
HIP 20775 |
29.78 |
| 2026-05-29 12:00 |
04:24:31.58 |
+40:16:00.4 |
HIP 20775 |
28.86 |
| 2026-05-30 00:00 |
04:24:36.37 |
+40:16:10.5 |
HIP 20775 |
27.93 |
| 2026-05-30 12:00 |
04:24:41.17 |
+40:16:20.7 |
HIP 20775 |
27.01 |
| 2026-05-31 00:00 |
04:24:45.97 |
+40:16:31.1 |
HIP 20775 |
26.08 |
| 2026-05-31 12:00 |
04:24:50.76 |
+40:16:41.7 |
HIP 20775 |
25.16 |
| 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 |