メタデータ
| 項目 |
値 |
| Designation |
C/2010 J2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-06-03T20:45:36.622080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:44Z |
| Obs used |
543 |
| NEO |
- |
| M1 |
10.100 |
| K1 |
9.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-08-16.0000000 |
| e |
0.99945919 |
| q (au) |
3.386996 |
| a (au) |
6262.872230 |
| i (deg) |
125.851540 |
| Ω (om, deg) |
311.794846 |
| ω (w, deg) |
4.616553 |
| M (ma, deg) |
0.000145 |
等級
散乱 + 全体線形
$$
M_a = (11.081 + 2.443\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.081 |
| n |
2.443 |
| gf |
0.992 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.980 |
| 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 |
10:55:16.38 |
+35:33:07.3 |
HIP 53525 |
30.62 |
| 2026-05-12 12:00 |
10:55:14.54 |
+35:32:48.0 |
HIP 53525 |
30.67 |
| 2026-05-13 00:00 |
10:55:12.73 |
+35:32:28.4 |
HIP 53525 |
30.72 |
| 2026-05-13 12:00 |
10:55:10.96 |
+35:32:08.6 |
HIP 53525 |
30.77 |
| 2026-05-14 00:00 |
10:55:09.22 |
+35:31:48.6 |
HIP 53525 |
30.83 |
| 2026-05-14 12:00 |
10:55:07.51 |
+35:31:28.3 |
HIP 53525 |
30.88 |
| 2026-05-15 00:00 |
10:55:05.84 |
+35:31:07.9 |
HIP 53525 |
30.93 |
| 2026-05-15 12:00 |
10:55:04.21 |
+35:30:47.3 |
HIP 53525 |
30.98 |
| 2026-05-16 00:00 |
10:55:02.61 |
+35:30:26.4 |
HIP 53525 |
31.03 |
| 2026-05-16 12:00 |
10:55:01.04 |
+35:30:05.4 |
HIP 53525 |
31.08 |
| 2026-05-17 00:00 |
10:54:59.51 |
+35:29:44.1 |
HIP 53525 |
31.13 |
| 2026-05-17 12:00 |
10:54:58.01 |
+35:29:22.7 |
HIP 53525 |
31.18 |
| 2026-05-18 00:00 |
10:54:56.55 |
+35:29:01.0 |
HIP 53525 |
31.23 |
| 2026-05-18 12:00 |
10:54:55.12 |
+35:28:39.2 |
HIP 53525 |
31.28 |
| 2026-05-19 00:00 |
10:54:53.72 |
+35:28:17.1 |
HIP 53176 |
31.09 |
| 2026-05-19 12:00 |
10:54:52.37 |
+35:27:54.9 |
HIP 53176 |
30.67 |
| 2026-05-20 00:00 |
10:54:51.04 |
+35:27:32.4 |
HIP 53176 |
30.25 |
| 2026-05-20 12:00 |
10:54:49.75 |
+35:27:09.8 |
HIP 53176 |
29.85 |
| 2026-05-21 00:00 |
10:54:48.50 |
+35:26:47.0 |
HIP 53176 |
29.44 |
| 2026-05-21 12:00 |
10:54:47.28 |
+35:26:24.0 |
HIP 53176 |
29.05 |
| 2026-05-22 00:00 |
10:54:46.10 |
+35:26:00.8 |
HIP 53176 |
28.66 |
| 2026-05-22 12:00 |
10:54:44.95 |
+35:25:37.5 |
HIP 53176 |
28.28 |
| 2026-05-23 00:00 |
10:54:43.83 |
+35:25:13.9 |
HIP 53176 |
27.91 |
| 2026-05-23 12:00 |
10:54:42.76 |
+35:24:50.2 |
HIP 53176 |
27.54 |
| 2026-05-24 00:00 |
10:54:41.71 |
+35:24:26.3 |
HIP 53176 |
27.18 |
| 2026-05-24 12:00 |
10:54:40.70 |
+35:24:02.3 |
HIP 53176 |
26.83 |
| 2026-05-25 00:00 |
10:54:39.73 |
+35:23:38.0 |
HIP 53176 |
26.49 |
| 2026-05-25 12:00 |
10:54:38.79 |
+35:23:13.6 |
HIP 53176 |
26.16 |
| 2026-05-26 00:00 |
10:54:37.88 |
+35:22:49.1 |
HIP 53176 |
25.83 |
| 2026-05-26 12:00 |
10:54:37.01 |
+35:22:24.3 |
HIP 53176 |
25.52 |
| 2026-05-27 00:00 |
10:54:36.18 |
+35:21:59.4 |
HIP 53176 |
25.22 |
| 2026-05-27 12:00 |
10:54:35.38 |
+35:21:34.4 |
HIP 53176 |
24.92 |
| 2026-05-28 00:00 |
10:54:34.61 |
+35:21:09.1 |
HIP 53176 |
24.64 |
| 2026-05-28 12:00 |
10:54:33.88 |
+35:20:43.8 |
HIP 53176 |
24.36 |
| 2026-05-29 00:00 |
10:54:33.18 |
+35:20:18.2 |
HIP 53176 |
24.10 |
| 2026-05-29 12:00 |
10:54:32.52 |
+35:19:52.5 |
HIP 53176 |
23.85 |
| 2026-05-30 00:00 |
10:54:31.89 |
+35:19:26.7 |
HIP 53176 |
23.61 |
| 2026-05-30 12:00 |
10:54:31.30 |
+35:19:00.7 |
HIP 53176 |
23.39 |
| 2026-05-31 00:00 |
10:54:30.74 |
+35:18:34.6 |
HIP 53176 |
23.18 |
| 2026-05-31 12:00 |
10:54:30.22 |
+35:18:08.3 |
HIP 53176 |
22.98 |
| 2026-06-01 00:00 |
10:54:29.73 |
+35:17:41.8 |
HIP 53176 |
22.79 |
| 2026-06-01 12:00 |
10:54:29.27 |
+35:17:15.2 |
HIP 53176 |
22.62 |
| 2026-06-02 00:00 |
10:54:28.85 |
+35:16:48.5 |
HIP 53176 |
22.46 |