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
$$
M_a = (11.082 + 2.443\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.082 |
| n |
2.443 |
| gf |
0.993 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.955 |
| 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) |
| 2026-07-29 00:00 |
10:57:03.49 |
+34:18:38.1 |
HIP 53527 |
15.32 |
| 2026-07-29 12:00 |
10:57:06.31 |
+34:18:07.9 |
HIP 53527 |
15.81 |
| 2026-07-30 00:00 |
10:57:09.14 |
+34:17:37.8 |
HIP 53527 |
16.32 |
| 2026-07-30 12:00 |
10:57:11.99 |
+34:17:07.7 |
HIP 53527 |
16.84 |
| 2026-07-31 00:00 |
10:57:14.85 |
+34:16:37.8 |
HIP 53527 |
17.39 |
| 2026-07-31 12:00 |
10:57:17.74 |
+34:16:07.9 |
HIP 53527 |
17.95 |
| 2026-08-01 00:00 |
10:57:20.64 |
+34:15:38.1 |
HIP 53527 |
18.52 |
| 2026-08-01 12:00 |
10:57:23.56 |
+34:15:08.4 |
HIP 53527 |
19.11 |
| 2026-08-02 00:00 |
10:57:26.49 |
+34:14:38.8 |
HIP 53527 |
19.71 |
| 2026-08-02 12:00 |
10:57:29.45 |
+34:14:09.2 |
HIP 53527 |
20.33 |
| 2026-08-03 00:00 |
10:57:32.41 |
+34:13:39.8 |
HIP 53527 |
20.95 |
| 2026-08-03 12:00 |
10:57:35.40 |
+34:13:10.4 |
HIP 53527 |
21.58 |
| 2026-08-04 00:00 |
10:57:38.40 |
+34:12:41.2 |
HIP 53527 |
22.23 |
| 2026-08-04 12:00 |
10:57:41.42 |
+34:12:12.0 |
HIP 53527 |
22.88 |
| 2026-08-05 00:00 |
10:57:44.45 |
+34:11:43.0 |
HIP 53527 |
23.54 |
| 2026-08-05 12:00 |
10:57:47.50 |
+34:11:14.0 |
HIP 53527 |
24.21 |
| 2026-08-06 00:00 |
10:57:50.57 |
+34:10:45.2 |
HIP 53527 |
24.88 |
| 2026-08-06 12:00 |
10:57:53.65 |
+34:10:16.4 |
HIP 53527 |
25.56 |
| 2026-08-07 00:00 |
10:57:56.74 |
+34:09:47.8 |
HIP 53527 |
26.25 |
| 2026-08-07 12:00 |
10:57:59.85 |
+34:09:19.2 |
HIP 53527 |
26.94 |
| 2026-08-08 00:00 |
10:58:02.97 |
+34:08:50.8 |
HIP 53527 |
27.64 |
| 2026-08-08 12:00 |
10:58:06.11 |
+34:08:22.4 |
HIP 53527 |
28.34 |
| 2026-08-09 00:00 |
10:58:09.26 |
+34:07:54.2 |
HIP 53527 |
29.05 |
| 2026-08-09 12:00 |
10:58:12.43 |
+34:07:26.1 |
HIP 53527 |
29.76 |
| 2026-08-10 00:00 |
10:58:15.61 |
+34:06:58.1 |
HIP 53527 |
30.48 |
| 2026-08-10 12:00 |
10:58:18.80 |
+34:06:30.3 |
HIP 53527 |
31.20 |
| 2026-08-11 00:00 |
10:58:22.00 |
+34:06:02.5 |
HIP 53527 |
31.92 |
| 2026-08-11 12:00 |
10:58:25.22 |
+34:05:34.9 |
HIP 53527 |
32.65 |
| 2026-08-12 00:00 |
10:58:28.45 |
+34:05:07.4 |
HIP 53527 |
33.38 |
| 2026-08-12 12:00 |
10:58:31.70 |
+34:04:40.0 |
HIP 53801 |
33.48 |
| 2026-08-13 00:00 |
10:58:34.95 |
+34:04:12.8 |
HIP 53801 |
33.33 |
| 2026-08-13 12:00 |
10:58:38.22 |
+34:03:45.6 |
HIP 53801 |
33.18 |
| 2026-08-14 00:00 |
10:58:41.50 |
+34:03:18.6 |
HIP 53801 |
33.06 |
| 2026-08-14 12:00 |
10:58:44.79 |
+34:02:51.8 |
HIP 53801 |
32.95 |
| 2026-08-15 00:00 |
10:58:48.09 |
+34:02:25.1 |
HIP 53801 |
32.85 |
| 2026-08-15 12:00 |
10:58:51.40 |
+34:01:58.5 |
HIP 53801 |
32.78 |
| 2026-08-16 00:00 |
10:58:54.72 |
+34:01:32.0 |
HIP 53799 |
32.56 |
| 2026-08-16 12:00 |
10:58:58.05 |
+34:01:05.7 |
HIP 53799 |
31.81 |
| 2026-08-17 00:00 |
10:59:01.39 |
+34:00:39.5 |
HIP 53799 |
31.05 |
| 2026-08-17 12:00 |
10:59:04.75 |
+34:00:13.5 |
HIP 53799 |
30.30 |
| 2026-08-18 00:00 |
10:59:08.11 |
+33:59:47.6 |
HIP 53799 |
29.56 |
| 2026-08-18 12:00 |
10:59:11.48 |
+33:59:21.8 |
HIP 53799 |
28.82 |
| 2026-08-19 00:00 |
10:59:14.86 |
+33:58:56.2 |
HIP 53799 |
28.08 |