メタデータ
| 項目 |
値 |
| Designation |
C/2013 F3 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-05-25T06:10:32.957760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:32Z |
| Obs used |
301 |
| NEO |
- |
| M1 |
15.400 |
| 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) |
2013-06-20.0000000 |
| e |
0.99704135 |
| q (au) |
2.252615 |
| a (au) |
761.365596 |
| i (deg) |
85.444578 |
| Ω (om, deg) |
266.108702 |
| ω (w, deg) |
18.757634 |
| M (ma, deg) |
0.001208 |
等級
散乱 + 全体線形
$$
M_a = (14.683 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.683 |
| n |
2.000 |
| gf |
0.998 |
| gb |
-0.997 |
| k |
1.000 |
| δ90 |
9.992 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2013-05-31 |
2015-04-15 |
-19.7588 |
+7.282 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
05:30:22.30 |
+36:14:07.8 |
HIP 25940 |
25.80 |
| 2026-05-12 12:00 |
05:30:26.49 |
+36:13:58.8 |
HIP 25940 |
25.01 |
| 2026-05-13 00:00 |
05:30:30.70 |
+36:13:49.9 |
HIP 25940 |
24.23 |
| 2026-05-13 12:00 |
05:30:34.93 |
+36:13:41.2 |
HIP 25940 |
23.44 |
| 2026-05-14 00:00 |
05:30:39.18 |
+36:13:32.5 |
HIP 25940 |
22.67 |
| 2026-05-14 12:00 |
05:30:43.45 |
+36:13:23.9 |
HIP 25940 |
21.89 |
| 2026-05-15 00:00 |
05:30:47.74 |
+36:13:15.5 |
HIP 25940 |
21.13 |
| 2026-05-15 12:00 |
05:30:52.04 |
+36:13:07.1 |
HIP 25940 |
20.37 |
| 2026-05-16 00:00 |
05:30:56.37 |
+36:12:58.9 |
HIP 25940 |
19.62 |
| 2026-05-16 12:00 |
05:31:00.71 |
+36:12:50.7 |
HIP 25940 |
18.87 |
| 2026-05-17 00:00 |
05:31:05.07 |
+36:12:42.7 |
HIP 25940 |
18.14 |
| 2026-05-17 12:00 |
05:31:09.44 |
+36:12:34.8 |
HIP 25940 |
17.43 |
| 2026-05-18 00:00 |
05:31:13.84 |
+36:12:26.9 |
HIP 25940 |
16.73 |
| 2026-05-18 12:00 |
05:31:18.25 |
+36:12:19.2 |
HIP 25940 |
16.05 |
| 2026-05-19 00:00 |
05:31:22.67 |
+36:12:11.6 |
HIP 25940 |
15.39 |
| 2026-05-19 12:00 |
05:31:27.12 |
+36:12:04.1 |
HIP 25940 |
14.75 |
| 2026-05-20 00:00 |
05:31:31.57 |
+36:11:56.7 |
HIP 25940 |
14.15 |
| 2026-05-20 12:00 |
05:31:36.05 |
+36:11:49.4 |
HIP 25940 |
13.58 |
| 2026-05-21 00:00 |
05:31:40.53 |
+36:11:42.2 |
HIP 25940 |
13.05 |
| 2026-05-21 12:00 |
05:31:45.04 |
+36:11:35.1 |
HIP 25940 |
12.56 |
| 2026-05-22 00:00 |
05:31:49.55 |
+36:11:28.1 |
HIP 25940 |
12.12 |
| 2026-05-22 12:00 |
05:31:54.09 |
+36:11:21.2 |
HIP 25940 |
11.75 |
| 2026-05-23 00:00 |
05:31:58.63 |
+36:11:14.5 |
HIP 25940 |
11.43 |
| 2026-05-23 12:00 |
05:32:03.19 |
+36:11:07.8 |
HIP 25940 |
11.18 |
| 2026-05-24 00:00 |
05:32:07.76 |
+36:11:01.2 |
HIP 25940 |
11.01 |
| 2026-05-24 12:00 |
05:32:12.34 |
+36:10:54.7 |
HIP 25940 |
10.92 |
| 2026-05-25 00:00 |
05:32:16.94 |
+36:10:48.4 |
HIP 25940 |
10.90 |
| 2026-05-25 12:00 |
05:32:21.55 |
+36:10:42.1 |
HIP 25995 |
10.63 |
| 2026-05-26 00:00 |
05:32:26.17 |
+36:10:36.0 |
HIP 25995 |
10.19 |
| 2026-05-26 12:00 |
05:32:30.80 |
+36:10:29.9 |
HIP 25995 |
9.81 |
| 2026-05-27 00:00 |
05:32:35.45 |
+36:10:24.0 |
HIP 25995 |
9.51 |
| 2026-05-27 12:00 |
05:32:40.10 |
+36:10:18.1 |
HIP 25995 |
9.29 |
| 2026-05-28 00:00 |
05:32:44.77 |
+36:10:12.4 |
HIP 25995 |
9.16 |
| 2026-05-28 12:00 |
05:32:49.44 |
+36:10:06.8 |
HIP 25995 |
9.12 |
| 2026-05-29 00:00 |
05:32:54.13 |
+36:10:01.2 |
HIP 25995 |
9.18 |
| 2026-05-29 12:00 |
05:32:58.82 |
+36:09:55.8 |
HIP 25995 |
9.34 |
| 2026-05-30 00:00 |
05:33:03.53 |
+36:09:50.5 |
HIP 25995 |
9.59 |
| 2026-05-30 12:00 |
05:33:08.24 |
+36:09:45.2 |
HIP 25995 |
9.92 |
| 2026-05-31 00:00 |
05:33:12.97 |
+36:09:40.1 |
HIP 25995 |
10.33 |
| 2026-05-31 12:00 |
05:33:17.70 |
+36:09:35.1 |
HIP 25995 |
10.80 |
| 2026-06-01 00:00 |
05:33:22.44 |
+36:09:30.2 |
HIP 25995 |
11.34 |
| 2026-06-01 12:00 |
05:33:27.19 |
+36:09:25.4 |
HIP 25995 |
11.93 |
| 2026-06-02 00:00 |
05:33:31.95 |
+36:09:20.7 |
HIP 25995 |
12.57 |