メタデータ
| 項目 |
値 |
| Designation |
P/2012 O2 (McNaught) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-06-25T02:23:11.711040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:20Z |
| Obs used |
81 |
| NEO |
- |
| M1 |
17.300 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-07-31.0000000 |
| e |
0.53827101 |
| q (au) |
1.660834 |
| a (au) |
3.596989 |
| i (deg) |
24.527455 |
| Ω (om, deg) |
120.813582 |
| ω (w, deg) |
183.047391 |
| M (ma, deg) |
5.186765 |
等級
散乱 + 全体線形
$$
M_a = (17.976 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.976 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.851 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
21:42:53.98 |
-13:40:47.4 |
HIP 107220 |
1.26 |
| 2026-03-26 12:00 |
21:44:18.38 |
-13:38:56.9 |
HIP 107404 |
14.41 |
| 2026-03-27 00:00 |
21:45:42.73 |
-13:37:05.6 |
HIP 107422 |
3.71 |
| 2026-03-27 12:00 |
21:47:07.05 |
-13:35:13.5 |
HIP 107422 |
24.13 |
| 2026-03-28 00:00 |
21:48:31.32 |
-13:33:20.5 |
HIP 107735 |
13.75 |
| 2026-03-28 12:00 |
21:49:55.55 |
-13:31:26.6 |
HIP 107735 |
8.09 |
| 2026-03-29 00:00 |
21:51:19.73 |
-13:29:32.0 |
HIP 107889 |
3.57 |
| 2026-03-29 12:00 |
21:52:43.87 |
-13:27:36.5 |
HIP 108036 |
9.87 |
| 2026-03-30 00:00 |
21:54:07.97 |
-13:25:40.3 |
HIP 108036 |
14.33 |
| 2026-03-30 12:00 |
21:55:32.02 |
-13:23:43.3 |
HIP 108334 |
20.30 |
| 2026-03-31 00:00 |
21:56:56.02 |
-13:21:45.6 |
HIP 108334 |
0.86 |
| 2026-03-31 12:00 |
21:58:19.98 |
-13:19:47.1 |
HIP 108477 |
5.23 |
| 2026-04-01 00:00 |
21:59:43.89 |
-13:17:47.9 |
HIP 108477 |
18.23 |
| 2026-04-01 12:00 |
22:01:07.75 |
-13:15:48.1 |
HIP 108692 |
14.18 |
| 2026-04-02 00:00 |
22:02:31.57 |
-13:13:47.5 |
HIP 108692 |
24.32 |
| 2026-04-02 12:00 |
22:03:55.33 |
-13:11:46.3 |
HIP 108931 |
10.91 |
| 2026-04-03 00:00 |
22:05:19.04 |
-13:09:44.5 |
HIP 109001 |
11.51 |
| 2026-04-03 12:00 |
22:06:42.70 |
-13:07:42.0 |
HIP 109001 |
27.13 |
| 2026-04-04 00:00 |
22:08:06.31 |
-13:05:38.9 |
HIP 109316 |
15.91 |
| 2026-04-04 12:00 |
22:09:29.87 |
-13:03:35.3 |
HIP 109316 |
17.76 |
| 2026-04-05 00:00 |
22:10:53.38 |
-13:01:31.0 |
HIP 109528 |
10.84 |
| 2026-04-05 12:00 |
22:12:16.83 |
-12:59:26.3 |
HIP 109672 |
10.88 |
| 2026-04-06 00:00 |
22:13:40.22 |
-12:57:21.0 |
HIP 109672 |
10.59 |
| 2026-04-06 12:00 |
22:15:03.57 |
-12:55:15.2 |
HIP 110000 |
26.02 |
| 2026-04-07 00:00 |
22:16:26.85 |
-12:53:08.9 |
HIP 110000 |
6.11 |
| 2026-04-07 12:00 |
22:17:50.08 |
-12:51:02.1 |
HIP 110000 |
15.16 |
| 2026-04-08 00:00 |
22:19:13.24 |
-12:48:54.9 |
HIP 110179 |
29.54 |
| 2026-04-08 12:00 |
22:20:36.35 |
-12:46:47.3 |
HIP 110278 |
33.85 |
| 2026-04-09 00:00 |
22:21:59.40 |
-12:44:39.2 |
HIP 110375 |
34.69 |
| 2026-04-09 12:00 |
22:23:22.39 |
-12:42:30.8 |
HIP 110637 |
24.91 |
| 2026-04-10 00:00 |
22:24:45.32 |
-12:40:22.0 |
HIP 110637 |
17.10 |
| 2026-04-10 12:00 |
22:26:08.18 |
-12:38:12.8 |
HIP 110741 |
9.81 |
| 2026-04-11 00:00 |
22:27:30.98 |
-12:36:03.4 |
HIP 110741 |
23.41 |
| 2026-04-11 12:00 |
22:28:53.72 |
-12:33:53.6 |
HIP 111066 |
26.72 |
| 2026-04-12 00:00 |
22:30:16.39 |
-12:31:43.5 |
HIP 111066 |
23.47 |
| 2026-04-12 12:00 |
22:31:38.99 |
-12:29:33.2 |
HIP 111376 |
32.25 |
| 2026-04-13 00:00 |
22:33:01.53 |
-12:27:22.7 |
HIP 111376 |
12.19 |
| 2026-04-13 12:00 |
22:34:24.00 |
-12:25:11.9 |
HIP 111376 |
8.86 |
| 2026-04-14 00:00 |
22:35:46.39 |
-12:23:01.0 |
HIP 111396 |
28.31 |
| 2026-04-14 12:00 |
22:37:08.72 |
-12:20:49.9 |
HIP 111651 |
33.05 |
| 2026-04-15 00:00 |
22:38:30.98 |
-12:18:38.6 |
HIP 111870 |
23.94 |
| 2026-04-15 12:00 |
22:39:53.16 |
-12:16:27.2 |
HIP 111870 |
20.94 |
| 2026-04-16 00:00 |
22:41:15.27 |
-12:14:15.7 |
HIP 112021 |
2.58 |