メタデータ
| 項目 |
値 |
| Designation |
C/2013 O3 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-09-09T23:40:11.818560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:38Z |
| Obs used |
103 |
| NEO |
- |
| M1 |
14.500 |
| 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) |
2013-10-05.0000000 |
| e |
0.99612066 |
| q (au) |
3.180104 |
| a (au) |
819.754366 |
| i (deg) |
102.839741 |
| Ω (om, deg) |
276.752114 |
| ω (w, deg) |
337.968517 |
| M (ma, deg) |
0.001050 |
等級
散乱 + 全体線形
$$
M_a = (14.626 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.626 |
| n |
2.000 |
| gf |
0.994 |
| gb |
-1.000 |
| k |
0.995 |
| 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) |
| 2026-03-26 00:00 |
10:41:54.17 |
+76:49:53.5 |
HIP 52312 |
23.59 |
| 2026-03-26 12:00 |
10:41:36.58 |
+76:49:32.8 |
HIP 52312 |
23.88 |
| 2026-03-27 00:00 |
10:41:19.08 |
+76:49:11.5 |
HIP 51779 |
22.92 |
| 2026-03-27 12:00 |
10:41:01.68 |
+76:48:49.7 |
HIP 51779 |
21.87 |
| 2026-03-28 00:00 |
10:40:44.37 |
+76:48:27.3 |
HIP 51779 |
20.83 |
| 2026-03-28 12:00 |
10:40:27.17 |
+76:48:04.3 |
HIP 51779 |
19.79 |
| 2026-03-29 00:00 |
10:40:10.05 |
+76:47:40.8 |
HIP 51779 |
18.75 |
| 2026-03-29 12:00 |
10:39:53.04 |
+76:47:16.8 |
HIP 51779 |
17.72 |
| 2026-03-30 00:00 |
10:39:36.13 |
+76:46:52.2 |
HIP 51779 |
16.70 |
| 2026-03-30 12:00 |
10:39:19.33 |
+76:46:27.0 |
HIP 51779 |
15.68 |
| 2026-03-31 00:00 |
10:39:02.62 |
+76:46:01.3 |
HIP 51779 |
14.68 |
| 2026-03-31 12:00 |
10:38:46.03 |
+76:45:35.1 |
HIP 51779 |
13.68 |
| 2026-04-01 00:00 |
10:38:29.53 |
+76:45:08.4 |
HIP 51779 |
12.70 |
| 2026-04-01 12:00 |
10:38:13.15 |
+76:44:41.1 |
HIP 51779 |
11.73 |
| 2026-04-02 00:00 |
10:37:56.88 |
+76:44:13.3 |
HIP 51779 |
10.77 |
| 2026-04-02 12:00 |
10:37:40.72 |
+76:43:44.9 |
HIP 51779 |
9.85 |
| 2026-04-03 00:00 |
10:37:24.66 |
+76:43:16.1 |
HIP 51779 |
8.95 |
| 2026-04-03 12:00 |
10:37:08.73 |
+76:42:46.7 |
HIP 51779 |
8.09 |
| 2026-04-04 00:00 |
10:36:52.90 |
+76:42:16.8 |
HIP 51779 |
7.29 |
| 2026-04-04 12:00 |
10:36:37.19 |
+76:41:46.4 |
HIP 51779 |
6.57 |
| 2026-04-05 00:00 |
10:36:21.60 |
+76:41:15.5 |
HIP 51779 |
5.94 |
| 2026-04-05 12:00 |
10:36:06.13 |
+76:40:44.2 |
HIP 51779 |
5.45 |
| 2026-04-06 00:00 |
10:35:50.77 |
+76:40:12.3 |
HIP 51779 |
5.13 |
| 2026-04-06 12:00 |
10:35:35.54 |
+76:39:39.9 |
HIP 51779 |
5.02 |
| 2026-04-07 00:00 |
10:35:20.43 |
+76:39:07.0 |
HIP 51779 |
5.12 |
| 2026-04-07 12:00 |
10:35:05.43 |
+76:38:33.7 |
HIP 51779 |
5.43 |
| 2026-04-08 00:00 |
10:34:50.57 |
+76:37:59.8 |
HIP 51779 |
5.92 |
| 2026-04-08 12:00 |
10:34:35.82 |
+76:37:25.5 |
HIP 51779 |
6.53 |
| 2026-04-09 00:00 |
10:34:21.20 |
+76:36:50.7 |
HIP 51779 |
7.25 |
| 2026-04-09 12:00 |
10:34:06.71 |
+76:36:15.4 |
HIP 51779 |
8.04 |
| 2026-04-10 00:00 |
10:33:52.35 |
+76:35:39.7 |
HIP 51779 |
8.88 |
| 2026-04-10 12:00 |
10:33:38.11 |
+76:35:03.5 |
HIP 51779 |
9.76 |
| 2026-04-11 00:00 |
10:33:24.00 |
+76:34:26.8 |
HIP 51779 |
10.66 |
| 2026-04-11 12:00 |
10:33:10.03 |
+76:33:49.7 |
HIP 51779 |
11.59 |
| 2026-04-12 00:00 |
10:32:56.18 |
+76:33:12.2 |
HIP 51779 |
12.54 |
| 2026-04-12 12:00 |
10:32:42.47 |
+76:32:34.2 |
HIP 51779 |
13.50 |
| 2026-04-13 00:00 |
10:32:28.89 |
+76:31:55.7 |
HIP 51779 |
14.47 |
| 2026-04-13 12:00 |
10:32:15.44 |
+76:31:16.8 |
HIP 51779 |
15.44 |
| 2026-04-14 00:00 |
10:32:02.13 |
+76:30:37.5 |
HIP 51779 |
16.43 |
| 2026-04-14 12:00 |
10:31:48.96 |
+76:29:57.7 |
HIP 51779 |
17.42 |
| 2026-04-15 00:00 |
10:31:35.92 |
+76:29:17.6 |
HIP 51779 |
18.41 |
| 2026-04-15 12:00 |
10:31:23.02 |
+76:28:37.0 |
HIP 51779 |
19.40 |
| 2026-04-16 00:00 |
10:31:10.26 |
+76:27:55.9 |
HIP 51779 |
20.40 |