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
$$
M_a = (17.186 + 4.987\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.186 |
| n |
4.987 |
| gf |
0.997 |
| 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) |
| 2026-05-12 00:00 |
03:54:20.42 |
+17:47:44.3 |
HIP 18304 |
13.15 |
| 2026-05-12 12:00 |
03:55:18.54 |
+17:51:17.8 |
HIP 18354 |
13.46 |
| 2026-05-13 00:00 |
03:56:16.58 |
+17:54:49.7 |
HIP 18354 |
20.72 |
| 2026-05-13 12:00 |
03:57:14.56 |
+17:58:19.9 |
HIP 18354 |
32.90 |
| 2026-05-14 00:00 |
03:58:12.48 |
+18:01:48.5 |
HIP 18735 |
38.40 |
| 2026-05-14 12:00 |
03:59:10.33 |
+18:05:15.4 |
HIP 18735 |
24.23 |
| 2026-05-15 00:00 |
04:00:08.11 |
+18:08:40.6 |
HIP 18735 |
10.09 |
| 2026-05-15 12:00 |
04:01:05.82 |
+18:12:04.2 |
HIP 18735 |
4.09 |
| 2026-05-16 00:00 |
04:02:03.46 |
+18:15:26.2 |
HIP 18849 |
13.17 |
| 2026-05-16 12:00 |
04:03:01.04 |
+18:18:46.5 |
HIP 18849 |
16.93 |
| 2026-05-17 00:00 |
04:03:58.54 |
+18:22:05.2 |
HIP 18909 |
21.37 |
| 2026-05-17 12:00 |
04:04:55.98 |
+18:25:22.2 |
HIP 18909 |
29.09 |
| 2026-05-18 00:00 |
04:05:53.35 |
+18:28:37.6 |
HIP 19098 |
32.52 |
| 2026-05-18 12:00 |
04:06:50.64 |
+18:31:51.3 |
HIP 19175 |
37.44 |
| 2026-05-19 00:00 |
04:07:47.87 |
+18:35:03.5 |
HIP 19403 |
29.62 |
| 2026-05-19 12:00 |
04:08:45.02 |
+18:38:14.0 |
HIP 19403 |
18.46 |
| 2026-05-20 00:00 |
04:09:42.11 |
+18:41:22.9 |
HIP 19403 |
13.82 |
| 2026-05-20 12:00 |
04:10:39.12 |
+18:44:30.2 |
HIP 19470 |
17.29 |
| 2026-05-21 00:00 |
04:11:36.06 |
+18:47:35.9 |
HIP 19549 |
25.38 |
| 2026-05-21 12:00 |
04:12:32.93 |
+18:50:40.0 |
HIP 19763 |
24.32 |
| 2026-05-22 00:00 |
04:13:29.72 |
+18:53:42.4 |
HIP 19763 |
10.70 |
| 2026-05-22 12:00 |
04:14:26.44 |
+18:56:43.3 |
HIP 19763 |
4.11 |
| 2026-05-23 00:00 |
04:15:23.09 |
+18:59:42.6 |
HIP 19763 |
17.22 |
| 2026-05-23 12:00 |
04:16:19.66 |
+19:02:40.3 |
HIP 19988 |
14.16 |
| 2026-05-24 00:00 |
04:17:16.16 |
+19:05:36.4 |
HIP 19988 |
8.66 |
| 2026-05-24 12:00 |
04:18:12.58 |
+19:08:31.0 |
HIP 19988 |
17.95 |
| 2026-05-25 00:00 |
04:19:08.93 |
+19:11:24.0 |
HIP 20237 |
15.33 |
| 2026-05-25 12:00 |
04:20:05.21 |
+19:14:15.4 |
HIP 20237 |
1.83 |
| 2026-05-26 00:00 |
04:21:01.41 |
+19:17:05.3 |
HIP 20237 |
11.85 |
| 2026-05-26 12:00 |
04:21:57.53 |
+19:19:53.6 |
HIP 20369 |
8.95 |
| 2026-05-27 00:00 |
04:22:53.58 |
+19:22:40.3 |
HIP 20390 |
15.87 |
| 2026-05-27 12:00 |
04:23:49.55 |
+19:25:25.5 |
HIP 20482 |
15.45 |
| 2026-05-28 00:00 |
04:24:45.45 |
+19:28:09.2 |
HIP 20482 |
22.55 |
| 2026-05-28 12:00 |
04:25:41.27 |
+19:30:51.4 |
HIP 20774 |
27.33 |
| 2026-05-29 00:00 |
04:26:37.02 |
+19:33:32.0 |
HIP 20774 |
18.02 |
| 2026-05-29 12:00 |
04:27:32.69 |
+19:36:11.1 |
HIP 20774 |
16.17 |
| 2026-05-30 00:00 |
04:28:28.29 |
+19:38:48.6 |
HIP 20890 |
6.01 |
| 2026-05-30 12:00 |
04:29:23.80 |
+19:41:24.7 |
HIP 20890 |
11.39 |
| 2026-05-31 00:00 |
04:30:19.24 |
+19:43:59.3 |
HIP 21008 |
6.46 |
| 2026-05-31 12:00 |
04:31:14.61 |
+19:46:32.3 |
HIP 21008 |
13.89 |
| 2026-06-01 00:00 |
04:32:09.90 |
+19:49:03.9 |
HIP 21240 |
17.23 |
| 2026-06-01 12:00 |
04:33:05.11 |
+19:51:34.0 |
HIP 21240 |
5.05 |
| 2026-06-02 00:00 |
04:34:00.24 |
+19:54:02.5 |
HIP 21240 |
10.16 |