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) |
| 2026-03-26 00:00 |
04:16:16.60 |
+40:20:25.9 |
HIP 19811 |
18.03 |
| 2026-03-26 12:00 |
04:16:18.54 |
+40:20:11.3 |
HIP 19811 |
18.47 |
| 2026-03-27 00:00 |
04:16:20.52 |
+40:19:56.9 |
HIP 19943 |
18.70 |
| 2026-03-27 12:00 |
04:16:22.55 |
+40:19:42.7 |
HIP 19943 |
18.40 |
| 2026-03-28 00:00 |
04:16:24.62 |
+40:19:28.6 |
HIP 19943 |
18.10 |
| 2026-03-28 12:00 |
04:16:26.73 |
+40:19:14.8 |
HIP 19943 |
17.82 |
| 2026-03-29 00:00 |
04:16:28.89 |
+40:19:01.1 |
HIP 19943 |
17.54 |
| 2026-03-29 12:00 |
04:16:31.08 |
+40:18:47.7 |
HIP 19943 |
17.28 |
| 2026-03-30 00:00 |
04:16:33.32 |
+40:18:34.4 |
HIP 19943 |
17.02 |
| 2026-03-30 12:00 |
04:16:35.60 |
+40:18:21.3 |
HIP 19943 |
16.78 |
| 2026-03-31 00:00 |
04:16:37.91 |
+40:18:08.4 |
HIP 19943 |
16.56 |
| 2026-03-31 12:00 |
04:16:40.27 |
+40:17:55.8 |
HIP 19943 |
16.35 |
| 2026-04-01 00:00 |
04:16:42.67 |
+40:17:43.3 |
HIP 19943 |
16.15 |
| 2026-04-01 12:00 |
04:16:45.11 |
+40:17:31.0 |
HIP 19943 |
15.97 |
| 2026-04-02 00:00 |
04:16:47.58 |
+40:17:18.9 |
HIP 19943 |
15.82 |
| 2026-04-02 12:00 |
04:16:50.10 |
+40:17:07.0 |
HIP 19943 |
15.68 |
| 2026-04-03 00:00 |
04:16:52.66 |
+40:16:55.3 |
HIP 19943 |
15.56 |
| 2026-04-03 12:00 |
04:16:55.25 |
+40:16:43.8 |
HIP 19943 |
15.46 |
| 2026-04-04 00:00 |
04:16:57.88 |
+40:16:32.4 |
HIP 19943 |
15.39 |
| 2026-04-04 12:00 |
04:17:00.55 |
+40:16:21.3 |
HIP 19943 |
15.33 |
| 2026-04-05 00:00 |
04:17:03.26 |
+40:16:10.4 |
HIP 19943 |
15.31 |
| 2026-04-05 12:00 |
04:17:06.01 |
+40:15:59.7 |
HIP 19943 |
15.31 |
| 2026-04-06 00:00 |
04:17:08.79 |
+40:15:49.2 |
HIP 19943 |
15.33 |
| 2026-04-06 12:00 |
04:17:11.61 |
+40:15:38.8 |
HIP 19943 |
15.38 |
| 2026-04-07 00:00 |
04:17:14.47 |
+40:15:28.7 |
HIP 19943 |
15.46 |
| 2026-04-07 12:00 |
04:17:17.36 |
+40:15:18.8 |
HIP 19943 |
15.56 |
| 2026-04-08 00:00 |
04:17:20.29 |
+40:15:09.0 |
HIP 19943 |
15.69 |
| 2026-04-08 12:00 |
04:17:23.25 |
+40:14:59.5 |
HIP 19943 |
15.85 |
| 2026-04-09 00:00 |
04:17:26.25 |
+40:14:50.2 |
HIP 19943 |
16.04 |
| 2026-04-09 12:00 |
04:17:29.29 |
+40:14:41.1 |
HIP 19943 |
16.25 |
| 2026-04-10 00:00 |
04:17:32.36 |
+40:14:32.1 |
HIP 19943 |
16.48 |
| 2026-04-10 12:00 |
04:17:35.47 |
+40:14:23.4 |
HIP 19943 |
16.75 |
| 2026-04-11 00:00 |
04:17:38.60 |
+40:14:14.9 |
HIP 19943 |
17.03 |
| 2026-04-11 12:00 |
04:17:41.78 |
+40:14:06.5 |
HIP 19943 |
17.34 |
| 2026-04-12 00:00 |
04:17:44.99 |
+40:13:58.4 |
HIP 19943 |
17.68 |
| 2026-04-12 12:00 |
04:17:48.23 |
+40:13:50.5 |
HIP 19943 |
18.04 |
| 2026-04-13 00:00 |
04:17:51.50 |
+40:13:42.8 |
HIP 19943 |
18.42 |
| 2026-04-13 12:00 |
04:17:54.80 |
+40:13:35.3 |
HIP 19943 |
18.82 |
| 2026-04-14 00:00 |
04:17:58.14 |
+40:13:27.9 |
HIP 19943 |
19.24 |
| 2026-04-14 12:00 |
04:18:01.51 |
+40:13:20.8 |
HIP 19943 |
19.68 |
| 2026-04-15 00:00 |
04:18:04.92 |
+40:13:13.9 |
HIP 19943 |
20.13 |
| 2026-04-15 12:00 |
04:18:08.35 |
+40:13:07.2 |
HIP 19943 |
20.61 |
| 2026-04-16 00:00 |
04:18:11.82 |
+40:13:00.7 |
HIP 19943 |
21.10 |