メタデータ
| 項目 |
値 |
| Designation |
C/2011 L2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-11-01T06:33:18.060480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:51Z |
| Obs used |
57 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
13.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-09-08.0000000 |
| e |
1.00177257 |
| q (au) |
1.943449 |
| a (au) |
-1096.399619 |
| i (deg) |
104.257426 |
| Ω (om, deg) |
131.347725 |
| ω (w, deg) |
257.028128 |
| M (ma, deg) |
-0.001473 |
等級
散乱 + 全体線形
$$
M_a = (18.228 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.228 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-09-20 00:00 |
09:17:53.72 |
+64:36:30.9 |
HIP 45774 |
27.80 |
| 2026-09-20 12:00 |
09:17:59.82 |
+64:36:53.1 |
HIP 45774 |
27.81 |
| 2026-09-21 00:00 |
09:18:05.89 |
+64:37:15.6 |
HIP 45794 |
27.18 |
| 2026-09-21 12:00 |
09:18:11.92 |
+64:37:38.4 |
HIP 45794 |
26.53 |
| 2026-09-22 00:00 |
09:18:17.90 |
+64:38:01.5 |
HIP 45794 |
25.88 |
| 2026-09-22 12:00 |
09:18:23.84 |
+64:38:24.9 |
HIP 45794 |
25.24 |
| 2026-09-23 00:00 |
09:18:29.74 |
+64:38:48.7 |
HIP 45794 |
24.60 |
| 2026-09-23 12:00 |
09:18:35.60 |
+64:39:12.7 |
HIP 45794 |
23.96 |
| 2026-09-24 00:00 |
09:18:41.41 |
+64:39:37.1 |
HIP 45794 |
23.33 |
| 2026-09-24 12:00 |
09:18:47.18 |
+64:40:01.8 |
HIP 45794 |
22.70 |
| 2026-09-25 00:00 |
09:18:52.91 |
+64:40:26.8 |
HIP 45794 |
22.07 |
| 2026-09-25 12:00 |
09:18:58.59 |
+64:40:52.0 |
HIP 45794 |
21.45 |
| 2026-09-26 00:00 |
09:19:04.23 |
+64:41:17.6 |
HIP 45794 |
20.83 |
| 2026-09-26 12:00 |
09:19:09.83 |
+64:41:43.5 |
HIP 45794 |
20.22 |
| 2026-09-27 00:00 |
09:19:15.38 |
+64:42:09.7 |
HIP 45794 |
19.62 |
| 2026-09-27 12:00 |
09:19:20.88 |
+64:42:36.2 |
HIP 45794 |
19.01 |
| 2026-09-28 00:00 |
09:19:26.33 |
+64:43:03.0 |
HIP 45794 |
18.42 |
| 2026-09-28 12:00 |
09:19:31.74 |
+64:43:30.1 |
HIP 45794 |
17.83 |
| 2026-09-29 00:00 |
09:19:37.11 |
+64:43:57.6 |
HIP 45794 |
17.25 |
| 2026-09-29 12:00 |
09:19:42.42 |
+64:44:25.3 |
HIP 45794 |
16.68 |
| 2026-09-30 00:00 |
09:19:47.69 |
+64:44:53.3 |
HIP 45794 |
16.11 |
| 2026-09-30 12:00 |
09:19:52.91 |
+64:45:21.6 |
HIP 45794 |
15.56 |
| 2026-10-01 00:00 |
09:19:58.08 |
+64:45:50.2 |
HIP 45794 |
15.01 |
| 2026-10-01 12:00 |
09:20:03.21 |
+64:46:19.0 |
HIP 45794 |
14.48 |
| 2026-10-02 00:00 |
09:20:08.28 |
+64:46:48.2 |
HIP 45794 |
13.96 |
| 2026-10-02 12:00 |
09:20:13.31 |
+64:47:17.7 |
HIP 45794 |
13.45 |
| 2026-10-03 00:00 |
09:20:18.28 |
+64:47:47.5 |
HIP 45794 |
12.96 |
| 2026-10-03 12:00 |
09:20:23.20 |
+64:48:17.5 |
HIP 45794 |
12.49 |
| 2026-10-04 00:00 |
09:20:28.08 |
+64:48:47.9 |
HIP 45794 |
12.04 |
| 2026-10-04 12:00 |
09:20:32.90 |
+64:49:18.5 |
HIP 45794 |
11.61 |
| 2026-10-05 00:00 |
09:20:37.66 |
+64:49:49.4 |
HIP 45794 |
11.20 |
| 2026-10-05 12:00 |
09:20:42.38 |
+64:50:20.6 |
HIP 45794 |
10.82 |
| 2026-10-06 00:00 |
09:20:47.05 |
+64:50:52.1 |
HIP 45794 |
10.47 |
| 2026-10-06 12:00 |
09:20:51.66 |
+64:51:23.9 |
HIP 45794 |
10.15 |
| 2026-10-07 00:00 |
09:20:56.21 |
+64:51:56.0 |
HIP 45794 |
9.86 |
| 2026-10-07 12:00 |
09:21:00.72 |
+64:52:28.3 |
HIP 45794 |
9.62 |
| 2026-10-08 00:00 |
09:21:05.16 |
+64:53:00.9 |
HIP 45794 |
9.41 |
| 2026-10-08 12:00 |
09:21:09.56 |
+64:53:33.8 |
HIP 45794 |
9.26 |
| 2026-10-09 00:00 |
09:21:13.90 |
+64:54:07.0 |
HIP 45794 |
9.14 |
| 2026-10-09 12:00 |
09:21:18.18 |
+64:54:40.4 |
HIP 45794 |
9.08 |
| 2026-10-10 00:00 |
09:21:22.40 |
+64:55:14.2 |
HIP 45794 |
9.06 |
| 2026-10-10 12:00 |
09:21:26.57 |
+64:55:48.2 |
HIP 45794 |
9.09 |
| 2026-10-11 00:00 |
09:21:30.69 |
+64:56:22.4 |
HIP 45794 |
9.17 |