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) |
| 2026-09-20 00:00 |
03:06:09.09 |
-21:29:32.5 |
HIP 14314 |
22.11 |
| 2026-09-20 12:00 |
03:06:00.88 |
-21:35:07.4 |
HIP 14314 |
22.33 |
| 2026-09-21 00:00 |
03:05:52.16 |
-21:40:40.3 |
HIP 14314 |
23.94 |
| 2026-09-21 12:00 |
03:05:42.96 |
-21:46:11.0 |
HIP 14314 |
26.69 |
| 2026-09-22 00:00 |
03:05:33.27 |
-21:51:39.6 |
HIP 14314 |
30.28 |
| 2026-09-22 12:00 |
03:05:23.09 |
-21:57:06.0 |
HIP 14314 |
34.45 |
| 2026-09-23 00:00 |
03:05:12.43 |
-22:02:30.0 |
HIP 14186 |
33.90 |
| 2026-09-23 12:00 |
03:05:01.29 |
-22:07:51.6 |
HIP 14186 |
33.85 |
| 2026-09-24 00:00 |
03:04:49.68 |
-22:13:10.8 |
HIP 14186 |
34.73 |
| 2026-09-24 12:00 |
03:04:37.59 |
-22:18:27.4 |
HIP 14186 |
36.48 |
| 2026-09-25 00:00 |
03:04:25.03 |
-22:23:41.4 |
HIP 14148 |
37.19 |
| 2026-09-25 12:00 |
03:04:12.01 |
-22:28:52.6 |
HIP 14148 |
31.55 |
| 2026-09-26 00:00 |
03:03:58.53 |
-22:34:01.1 |
HIP 14148 |
26.00 |
| 2026-09-26 12:00 |
03:03:44.59 |
-22:39:06.8 |
HIP 14148 |
20.64 |
| 2026-09-27 00:00 |
03:03:30.20 |
-22:44:09.5 |
HIP 14148 |
15.68 |
| 2026-09-27 12:00 |
03:03:15.36 |
-22:49:09.3 |
HIP 14148 |
11.68 |
| 2026-09-28 00:00 |
03:03:00.07 |
-22:54:05.9 |
HIP 14148 |
9.91 |
| 2026-09-28 12:00 |
03:02:44.35 |
-22:58:59.5 |
HIP 14148 |
11.47 |
| 2026-09-29 00:00 |
03:02:28.18 |
-23:03:49.8 |
HIP 14148 |
15.41 |
| 2026-09-29 12:00 |
03:02:11.59 |
-23:08:36.8 |
HIP 14148 |
20.40 |
| 2026-09-30 00:00 |
03:01:54.57 |
-23:13:20.4 |
HIP 14146 |
25.02 |
| 2026-09-30 12:00 |
03:01:37.13 |
-23:18:00.6 |
HIP 14146 |
22.18 |
| 2026-10-01 00:00 |
03:01:19.27 |
-23:22:37.3 |
HIP 14146 |
20.92 |
| 2026-10-01 12:00 |
03:01:00.99 |
-23:27:10.4 |
HIP 13955 |
18.36 |
| 2026-10-02 00:00 |
03:00:42.31 |
-23:31:39.9 |
HIP 13955 |
16.15 |
| 2026-10-02 12:00 |
03:00:23.23 |
-23:36:05.6 |
HIP 13920 |
15.62 |
| 2026-10-03 00:00 |
03:00:03.75 |
-23:40:27.4 |
HIP 13920 |
10.28 |
| 2026-10-03 12:00 |
02:59:43.89 |
-23:44:45.4 |
HIP 13920 |
6.62 |
| 2026-10-04 00:00 |
02:59:23.63 |
-23:48:59.5 |
HIP 13920 |
7.69 |
| 2026-10-04 12:00 |
02:59:03.00 |
-23:53:09.5 |
HIP 13920 |
12.34 |
| 2026-10-05 00:00 |
02:58:42.00 |
-23:57:15.4 |
HIP 13920 |
18.00 |
| 2026-10-05 12:00 |
02:58:20.63 |
-24:01:17.1 |
HIP 13782 |
16.14 |
| 2026-10-06 00:00 |
02:57:58.91 |
-24:05:14.5 |
HIP 13782 |
15.73 |
| 2026-10-06 12:00 |
02:57:36.83 |
-24:09:07.6 |
HIP 13782 |
17.66 |
| 2026-10-07 00:00 |
02:57:14.41 |
-24:12:56.3 |
HIP 13696 |
12.87 |
| 2026-10-07 12:00 |
02:56:51.65 |
-24:16:40.6 |
HIP 13696 |
6.73 |
| 2026-10-08 00:00 |
02:56:28.56 |
-24:20:20.3 |
HIP 13696 |
2.49 |
| 2026-10-08 12:00 |
02:56:05.15 |
-24:23:55.4 |
HIP 13696 |
7.00 |
| 2026-10-09 00:00 |
02:55:41.43 |
-24:27:25.8 |
HIP 13696 |
13.20 |
| 2026-10-09 12:00 |
02:55:17.40 |
-24:30:51.5 |
HIP 13696 |
19.55 |
| 2026-10-10 00:00 |
02:54:53.07 |
-24:34:12.4 |
HIP 13696 |
25.96 |
| 2026-10-10 12:00 |
02:54:28.45 |
-24:37:28.5 |
HIP 13696 |
32.39 |
| 2026-10-11 00:00 |
02:54:03.55 |
-24:40:39.6 |
HIP 13610 |
37.43 |