メタデータ
| 項目 |
値 |
| Designation |
P/2012 O1 (McNaught) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-07-23T21:45:24.840000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:19Z |
| Obs used |
98 |
| NEO |
- |
| M1 |
18.900 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-08-23.0000000 |
| e |
0.57924394 |
| q (au) |
1.499146 |
| a (au) |
3.562980 |
| i (deg) |
11.428578 |
| Ω (om, deg) |
111.278961 |
| ω (w, deg) |
222.109887 |
| M (ma, deg) |
4.410178 |
等級
散乱 + 全体線形
$$
M_a = (17.186 + 4.986\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.186 |
| n |
4.986 |
| gf |
1.000 |
| gb |
-0.758 |
| k |
0.973 |
| 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) |
| 2026-09-25 00:00 |
07:14:32.14 |
+22:05:12.9 |
HIP 35106 |
15.98 |
| 2026-09-25 12:00 |
07:14:54.53 |
+22:05:02.9 |
HIP 35106 |
11.49 |
| 2026-09-26 00:00 |
07:15:16.68 |
+22:04:53.3 |
HIP 35106 |
7.94 |
| 2026-09-26 12:00 |
07:15:38.59 |
+22:04:44.0 |
HIP 35106 |
6.83 |
| 2026-09-27 00:00 |
07:16:00.25 |
+22:04:35.0 |
HIP 35106 |
9.02 |
| 2026-09-27 12:00 |
07:16:21.67 |
+22:04:26.4 |
HIP 35106 |
12.85 |
| 2026-09-28 00:00 |
07:16:42.84 |
+22:04:18.1 |
HIP 35106 |
17.22 |
| 2026-09-28 12:00 |
07:17:03.76 |
+22:04:10.2 |
HIP 35106 |
21.77 |
| 2026-09-29 00:00 |
07:17:24.43 |
+22:04:02.7 |
HIP 35106 |
26.37 |
| 2026-09-29 12:00 |
07:17:44.84 |
+22:03:55.6 |
HIP 35481 |
23.08 |
| 2026-09-30 00:00 |
07:18:05.01 |
+22:03:48.8 |
HIP 35481 |
18.42 |
| 2026-09-30 12:00 |
07:18:24.92 |
+22:03:42.4 |
HIP 35481 |
13.84 |
| 2026-10-01 00:00 |
07:18:44.57 |
+22:03:36.5 |
HIP 35481 |
9.36 |
| 2026-10-01 12:00 |
07:19:03.96 |
+22:03:30.9 |
HIP 35481 |
5.05 |
| 2026-10-02 00:00 |
07:19:23.10 |
+22:03:25.8 |
HIP 35481 |
1.97 |
| 2026-10-02 12:00 |
07:19:41.97 |
+22:03:21.2 |
HIP 35481 |
4.60 |
| 2026-10-03 00:00 |
07:20:00.58 |
+22:03:16.9 |
HIP 35550 |
4.62 |
| 2026-10-03 12:00 |
07:20:18.93 |
+22:03:13.2 |
HIP 35550 |
5.05 |
| 2026-10-04 00:00 |
07:20:37.01 |
+22:03:09.9 |
HIP 35550 |
8.06 |
| 2026-10-04 12:00 |
07:20:54.83 |
+22:03:07.1 |
HIP 35550 |
11.76 |
| 2026-10-05 00:00 |
07:21:12.37 |
+22:03:04.7 |
HIP 35550 |
15.62 |
| 2026-10-05 12:00 |
07:21:29.65 |
+22:03:02.9 |
HIP 35550 |
19.50 |
| 2026-10-06 00:00 |
07:21:46.65 |
+22:03:01.6 |
HIP 35807 |
19.05 |
| 2026-10-06 12:00 |
07:22:03.38 |
+22:03:00.7 |
HIP 35807 |
15.33 |
| 2026-10-07 00:00 |
07:22:19.83 |
+22:03:00.4 |
HIP 35807 |
11.76 |
| 2026-10-07 12:00 |
07:22:36.01 |
+22:03:00.7 |
HIP 35807 |
8.47 |
| 2026-10-08 00:00 |
07:22:51.91 |
+22:03:01.5 |
HIP 35807 |
5.82 |
| 2026-10-08 12:00 |
07:23:07.53 |
+22:03:02.8 |
HIP 35807 |
4.82 |
| 2026-10-09 00:00 |
07:23:22.86 |
+22:03:04.7 |
HIP 35807 |
6.19 |
| 2026-10-09 12:00 |
07:23:37.92 |
+22:03:07.1 |
HIP 35807 |
8.82 |
| 2026-10-10 00:00 |
07:23:52.69 |
+22:03:10.2 |
HIP 35807 |
11.85 |
| 2026-10-10 12:00 |
07:24:07.17 |
+22:03:13.8 |
HIP 35807 |
14.99 |
| 2026-10-11 00:00 |
07:24:21.37 |
+22:03:18.0 |
HIP 35807 |
18.14 |
| 2026-10-11 12:00 |
07:24:35.27 |
+22:03:22.9 |
HIP 35807 |
21.27 |
| 2026-10-12 00:00 |
07:24:48.89 |
+22:03:28.3 |
HIP 36086 |
20.59 |
| 2026-10-12 12:00 |
07:25:02.22 |
+22:03:34.4 |
HIP 36086 |
18.01 |
| 2026-10-13 00:00 |
07:25:15.25 |
+22:03:41.1 |
HIP 36086 |
15.67 |
| 2026-10-13 12:00 |
07:25:27.99 |
+22:03:48.4 |
HIP 36086 |
13.66 |
| 2026-10-14 00:00 |
07:25:40.44 |
+22:03:56.4 |
HIP 36086 |
12.09 |
| 2026-10-14 12:00 |
07:25:52.59 |
+22:04:05.0 |
HIP 36086 |
11.09 |
| 2026-10-15 00:00 |
07:26:04.44 |
+22:04:14.2 |
HIP 36086 |
10.78 |
| 2026-10-15 12:00 |
07:26:15.99 |
+22:04:24.2 |
HIP 36086 |
11.15 |
| 2026-10-16 00:00 |
07:26:27.24 |
+22:04:34.8 |
HIP 36086 |
12.10 |