メタデータ
| 項目 |
値 |
| Designation |
C/2005 E2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-02-23T11:21:44.352000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:47Z |
| Obs used |
1317 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
7.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2006-05-09.0000000 |
| e |
1.00013891 |
| q (au) |
1.519579 |
| a (au) |
-10939.545227 |
| i (deg) |
16.988338 |
| Ω (om, deg) |
347.847398 |
| ω (w, deg) |
39.966443 |
| M (ma, deg) |
0.000064 |
等級
散乱 + 全体線形
$$
M_a = (8.500 + 2.795\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.500 |
| n |
2.795 |
| gf |
1.000 |
| gb |
-0.592 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2005-03-12 |
2006-02-23 |
-0.0274 |
-0.832 |
| 2006-02-23 |
2006-05-02 |
-34.1608 |
+5.629 |
| 2006-05-02 |
2006-10-31 |
+10.7803 |
-5.797 |
| 2006-10-31 |
2007-03-17 |
-2.8233 |
+2.023 |
| 2007-03-17 |
2008-03-02 |
+3.2327 |
-2.351 |
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 |
12:05:59.43 |
-06:10:31.5 |
HIP 59104 |
19.12 |
| 2026-07-29 12:00 |
12:06:01.01 |
-06:10:38.8 |
HIP 59104 |
18.79 |
| 2026-07-30 00:00 |
12:06:02.60 |
-06:10:46.4 |
HIP 59104 |
18.45 |
| 2026-07-30 12:00 |
12:06:04.21 |
-06:10:54.0 |
HIP 59104 |
18.11 |
| 2026-07-31 00:00 |
12:06:05.84 |
-06:11:01.8 |
HIP 59104 |
17.77 |
| 2026-07-31 12:00 |
12:06:07.49 |
-06:11:09.7 |
HIP 59104 |
17.43 |
| 2026-08-01 00:00 |
12:06:09.15 |
-06:11:17.7 |
HIP 59104 |
17.09 |
| 2026-08-01 12:00 |
12:06:10.83 |
-06:11:25.9 |
HIP 59104 |
16.75 |
| 2026-08-02 00:00 |
12:06:12.52 |
-06:11:34.2 |
HIP 59104 |
16.42 |
| 2026-08-02 12:00 |
12:06:14.24 |
-06:11:42.6 |
HIP 59104 |
16.09 |
| 2026-08-03 00:00 |
12:06:15.97 |
-06:11:51.2 |
HIP 59104 |
15.76 |
| 2026-08-03 12:00 |
12:06:17.71 |
-06:11:59.8 |
HIP 59104 |
15.43 |
| 2026-08-04 00:00 |
12:06:19.47 |
-06:12:08.6 |
HIP 59104 |
15.11 |
| 2026-08-04 12:00 |
12:06:21.25 |
-06:12:17.6 |
HIP 59104 |
14.80 |
| 2026-08-05 00:00 |
12:06:23.05 |
-06:12:26.6 |
HIP 59104 |
14.48 |
| 2026-08-05 12:00 |
12:06:24.86 |
-06:12:35.8 |
HIP 59104 |
14.18 |
| 2026-08-06 00:00 |
12:06:26.68 |
-06:12:45.1 |
HIP 59104 |
13.88 |
| 2026-08-06 12:00 |
12:06:28.52 |
-06:12:54.6 |
HIP 59104 |
13.60 |
| 2026-08-07 00:00 |
12:06:30.38 |
-06:13:04.1 |
HIP 59104 |
13.32 |
| 2026-08-07 12:00 |
12:06:32.26 |
-06:13:13.8 |
HIP 59104 |
13.05 |
| 2026-08-08 00:00 |
12:06:34.14 |
-06:13:23.6 |
HIP 59104 |
12.79 |
| 2026-08-08 12:00 |
12:06:36.05 |
-06:13:33.5 |
HIP 59104 |
12.55 |
| 2026-08-09 00:00 |
12:06:37.97 |
-06:13:43.6 |
HIP 59104 |
12.32 |
| 2026-08-09 12:00 |
12:06:39.90 |
-06:13:53.7 |
HIP 59104 |
12.11 |
| 2026-08-10 00:00 |
12:06:41.85 |
-06:14:04.0 |
HIP 59104 |
11.91 |
| 2026-08-10 12:00 |
12:06:43.81 |
-06:14:14.5 |
HIP 59104 |
11.73 |
| 2026-08-11 00:00 |
12:06:45.79 |
-06:14:25.0 |
HIP 59104 |
11.58 |
| 2026-08-11 12:00 |
12:06:47.79 |
-06:14:35.6 |
HIP 59104 |
11.44 |
| 2026-08-12 00:00 |
12:06:49.79 |
-06:14:46.4 |
HIP 59104 |
11.33 |
| 2026-08-12 12:00 |
12:06:51.82 |
-06:14:57.3 |
HIP 59104 |
11.24 |
| 2026-08-13 00:00 |
12:06:53.85 |
-06:15:08.3 |
HIP 59104 |
11.17 |
| 2026-08-13 12:00 |
12:06:55.90 |
-06:15:19.4 |
HIP 59104 |
11.14 |
| 2026-08-14 00:00 |
12:06:57.97 |
-06:15:30.6 |
HIP 59104 |
11.12 |
| 2026-08-14 12:00 |
12:07:00.05 |
-06:15:42.0 |
HIP 59104 |
11.14 |
| 2026-08-15 00:00 |
12:07:02.14 |
-06:15:53.5 |
HIP 59104 |
11.18 |
| 2026-08-15 12:00 |
12:07:04.24 |
-06:16:05.0 |
HIP 59104 |
11.26 |
| 2026-08-16 00:00 |
12:07:06.36 |
-06:16:16.7 |
HIP 59104 |
11.36 |
| 2026-08-16 12:00 |
12:07:08.49 |
-06:16:28.5 |
HIP 59104 |
11.49 |
| 2026-08-17 00:00 |
12:07:10.64 |
-06:16:40.4 |
HIP 59104 |
11.64 |
| 2026-08-17 12:00 |
12:07:12.79 |
-06:16:52.4 |
HIP 59104 |
11.83 |
| 2026-08-18 00:00 |
12:07:14.96 |
-06:17:04.5 |
HIP 59104 |
12.04 |
| 2026-08-18 12:00 |
12:07:17.14 |
-06:17:16.8 |
HIP 59104 |
12.27 |
| 2026-08-19 00:00 |
12:07:19.34 |
-06:17:29.1 |
HIP 59104 |
12.53 |