メタデータ
| 項目 |
値 |
| Designation |
P/2013 J2 (McNaught) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-08-22T23:57:25.464960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:35Z |
| Obs used |
1606 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
7.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-09-18.0000000 |
| e |
0.65614970 |
| q (au) |
2.147830 |
| a (au) |
6.246411 |
| i (deg) |
15.495560 |
| Ω (om, deg) |
289.393509 |
| ω (w, deg) |
37.889335 |
| M (ma, deg) |
1.641578 |
等級
散乱 + 全体線形
$$
M_a = (12.546 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.546 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.765 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
11:34:18.55 |
-15:30:27.9 |
HIP 56441 |
0.30 |
| 2026-05-12 12:00 |
11:34:13.12 |
-15:28:55.3 |
HIP 56441 |
2.32 |
| 2026-05-13 00:00 |
11:34:07.82 |
-15:27:23.1 |
HIP 56441 |
4.32 |
| 2026-05-13 12:00 |
11:34:02.65 |
-15:25:51.4 |
HIP 56441 |
6.29 |
| 2026-05-14 00:00 |
11:33:57.62 |
-15:24:20.2 |
HIP 56441 |
8.24 |
| 2026-05-14 12:00 |
11:33:52.72 |
-15:22:49.5 |
HIP 56441 |
10.15 |
| 2026-05-15 00:00 |
11:33:47.96 |
-15:21:19.3 |
HIP 56441 |
12.04 |
| 2026-05-15 12:00 |
11:33:43.34 |
-15:19:49.7 |
HIP 56441 |
13.91 |
| 2026-05-16 00:00 |
11:33:38.85 |
-15:18:20.5 |
HIP 56441 |
15.75 |
| 2026-05-16 12:00 |
11:33:34.49 |
-15:16:51.9 |
HIP 56441 |
17.56 |
| 2026-05-17 00:00 |
11:33:30.28 |
-15:15:23.9 |
HIP 56441 |
19.34 |
| 2026-05-17 12:00 |
11:33:26.20 |
-15:13:56.4 |
HIP 56441 |
21.09 |
| 2026-05-18 00:00 |
11:33:22.25 |
-15:12:29.5 |
HIP 56441 |
22.82 |
| 2026-05-18 12:00 |
11:33:18.45 |
-15:11:03.2 |
HIP 56441 |
24.52 |
| 2026-05-19 00:00 |
11:33:14.78 |
-15:09:37.5 |
HIP 56441 |
26.20 |
| 2026-05-19 12:00 |
11:33:11.25 |
-15:08:12.3 |
HIP 56441 |
27.85 |
| 2026-05-20 00:00 |
11:33:07.86 |
-15:06:47.8 |
HIP 56441 |
29.47 |
| 2026-05-20 12:00 |
11:33:04.61 |
-15:05:23.9 |
HIP 56441 |
31.06 |
| 2026-05-21 00:00 |
11:33:01.50 |
-15:04:00.7 |
HIP 56441 |
32.63 |
| 2026-05-21 12:00 |
11:32:58.53 |
-15:02:38.1 |
HIP 56441 |
34.17 |
| 2026-05-22 00:00 |
11:32:55.69 |
-15:01:16.1 |
HIP 56441 |
35.68 |
| 2026-05-22 12:00 |
11:32:52.99 |
-14:59:54.8 |
HIP 56441 |
37.17 |
| 2026-05-23 00:00 |
11:32:50.44 |
-14:58:34.1 |
HIP 56150 |
37.29 |
| 2026-05-23 12:00 |
11:32:48.02 |
-14:57:14.1 |
HIP 56150 |
36.16 |
| 2026-05-24 00:00 |
11:32:45.74 |
-14:55:54.8 |
HIP 56150 |
35.10 |
| 2026-05-24 12:00 |
11:32:43.59 |
-14:54:36.2 |
HIP 56150 |
34.11 |
| 2026-05-25 00:00 |
11:32:41.59 |
-14:53:18.2 |
HIP 56150 |
33.17 |
| 2026-05-25 12:00 |
11:32:39.73 |
-14:52:01.0 |
HIP 56150 |
32.31 |
| 2026-05-26 00:00 |
11:32:38.00 |
-14:50:44.5 |
HIP 56150 |
31.51 |
| 2026-05-26 12:00 |
11:32:36.42 |
-14:49:28.6 |
HIP 56150 |
30.79 |
| 2026-05-27 00:00 |
11:32:34.97 |
-14:48:13.5 |
HIP 56150 |
30.14 |
| 2026-05-27 12:00 |
11:32:33.66 |
-14:46:59.1 |
HIP 56150 |
29.58 |
| 2026-05-28 00:00 |
11:32:32.48 |
-14:45:45.5 |
HIP 56150 |
29.09 |
| 2026-05-28 12:00 |
11:32:31.45 |
-14:44:32.6 |
HIP 56150 |
28.68 |
| 2026-05-29 00:00 |
11:32:30.56 |
-14:43:20.4 |
HIP 56150 |
28.36 |
| 2026-05-29 12:00 |
11:32:29.80 |
-14:42:08.9 |
HIP 56150 |
28.12 |
| 2026-05-30 00:00 |
11:32:29.18 |
-14:40:58.3 |
HIP 56150 |
27.96 |
| 2026-05-30 12:00 |
11:32:28.70 |
-14:39:48.3 |
HIP 56150 |
27.89 |
| 2026-05-31 00:00 |
11:32:28.35 |
-14:38:39.2 |
HIP 56150 |
27.90 |
| 2026-05-31 12:00 |
11:32:28.14 |
-14:37:30.8 |
HIP 56150 |
27.98 |
| 2026-06-01 00:00 |
11:32:28.07 |
-14:36:23.2 |
HIP 56218 |
27.42 |
| 2026-06-01 12:00 |
11:32:28.14 |
-14:35:16.4 |
HIP 56218 |
26.42 |
| 2026-06-02 00:00 |
11:32:28.35 |
-14:34:10.3 |
HIP 56218 |
25.46 |