メタデータ
| 項目 |
値 |
| Designation |
C/2012 K6 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-05-21T11:03:28.212480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:10Z |
| Obs used |
1091 |
| NEO |
- |
| M1 |
8.900 |
| K1 |
7.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-12-31.0000000 |
| e |
0.99919878 |
| q (au) |
3.353032 |
| a (au) |
4184.883889 |
| i (deg) |
135.215103 |
| Ω (om, deg) |
206.898541 |
| ω (w, deg) |
338.826785 |
| M (ma, deg) |
0.000814 |
等級
散乱 + 全体線形
$$
M_a = (8.021 + 3.183\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.021 |
| n |
3.183 |
| gf |
0.997 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.993 |
| 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 |
| 2012-04-20 |
2013-05-20 |
+12.1573 |
-6.871 |
| 2013-06-02 |
2014-01-30 |
-1.7355 |
+0.738 |
| 2014-01-30 |
2015-04-09 |
-2.5207 |
+1.571 |
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) |
| 2026-07-29 00:00 |
05:02:02.46 |
+60:12:10.4 |
HIP 23522 |
17.63 |
| 2026-07-29 12:00 |
05:02:07.01 |
+60:12:38.7 |
HIP 23522 |
16.92 |
| 2026-07-30 00:00 |
05:02:11.50 |
+60:13:07.1 |
HIP 23522 |
16.22 |
| 2026-07-30 12:00 |
05:02:15.95 |
+60:13:35.7 |
HIP 23522 |
15.51 |
| 2026-07-31 00:00 |
05:02:20.35 |
+60:14:04.5 |
HIP 23522 |
14.81 |
| 2026-07-31 12:00 |
05:02:24.70 |
+60:14:33.4 |
HIP 23522 |
14.12 |
| 2026-08-01 00:00 |
05:02:28.99 |
+60:15:02.5 |
HIP 23522 |
13.43 |
| 2026-08-01 12:00 |
05:02:33.24 |
+60:15:31.8 |
HIP 23522 |
12.74 |
| 2026-08-02 00:00 |
05:02:37.44 |
+60:16:01.2 |
HIP 23522 |
12.06 |
| 2026-08-02 12:00 |
05:02:41.58 |
+60:16:30.7 |
HIP 23522 |
11.38 |
| 2026-08-03 00:00 |
05:02:45.68 |
+60:17:00.5 |
HIP 23522 |
10.70 |
| 2026-08-03 12:00 |
05:02:49.72 |
+60:17:30.3 |
HIP 23522 |
10.03 |
| 2026-08-04 00:00 |
05:02:53.71 |
+60:18:00.4 |
HIP 23522 |
9.37 |
| 2026-08-04 12:00 |
05:02:57.65 |
+60:18:30.5 |
HIP 23522 |
8.72 |
| 2026-08-05 00:00 |
05:03:01.53 |
+60:19:00.8 |
HIP 23522 |
8.07 |
| 2026-08-05 12:00 |
05:03:05.36 |
+60:19:31.3 |
HIP 23522 |
7.43 |
| 2026-08-06 00:00 |
05:03:09.14 |
+60:20:01.9 |
HIP 23522 |
6.80 |
| 2026-08-06 12:00 |
05:03:12.86 |
+60:20:32.7 |
HIP 23522 |
6.18 |
| 2026-08-07 00:00 |
05:03:16.53 |
+60:21:03.5 |
HIP 23522 |
5.58 |
| 2026-08-07 12:00 |
05:03:20.14 |
+60:21:34.6 |
HIP 23522 |
5.00 |
| 2026-08-08 00:00 |
05:03:23.70 |
+60:22:05.7 |
HIP 23522 |
4.44 |
| 2026-08-08 12:00 |
05:03:27.20 |
+60:22:37.0 |
HIP 23522 |
3.93 |
| 2026-08-09 00:00 |
05:03:30.65 |
+60:23:08.5 |
HIP 23522 |
3.46 |
| 2026-08-09 12:00 |
05:03:34.03 |
+60:23:40.0 |
HIP 23522 |
3.07 |
| 2026-08-10 00:00 |
05:03:37.37 |
+60:24:11.7 |
HIP 23522 |
2.79 |
| 2026-08-10 12:00 |
05:03:40.64 |
+60:24:43.6 |
HIP 23522 |
2.64 |
| 2026-08-11 00:00 |
05:03:43.86 |
+60:25:15.5 |
HIP 23522 |
2.64 |
| 2026-08-11 12:00 |
05:03:47.01 |
+60:25:47.6 |
HIP 23522 |
2.80 |
| 2026-08-12 00:00 |
05:03:50.11 |
+60:26:19.8 |
HIP 23522 |
3.09 |
| 2026-08-12 12:00 |
05:03:53.15 |
+60:26:52.1 |
HIP 23522 |
3.48 |
| 2026-08-13 00:00 |
05:03:56.14 |
+60:27:24.5 |
HIP 23522 |
3.92 |
| 2026-08-13 12:00 |
05:03:59.06 |
+60:27:57.0 |
HIP 23522 |
4.42 |
| 2026-08-14 00:00 |
05:04:01.92 |
+60:28:29.7 |
HIP 23522 |
4.94 |
| 2026-08-14 12:00 |
05:04:04.72 |
+60:29:02.4 |
HIP 23522 |
5.49 |
| 2026-08-15 00:00 |
05:04:07.46 |
+60:29:35.3 |
HIP 23522 |
6.05 |
| 2026-08-15 12:00 |
05:04:10.14 |
+60:30:08.3 |
HIP 23522 |
6.62 |
| 2026-08-16 00:00 |
05:04:12.75 |
+60:30:41.3 |
HIP 23522 |
7.19 |
| 2026-08-16 12:00 |
05:04:15.31 |
+60:31:14.5 |
HIP 23522 |
7.77 |
| 2026-08-17 00:00 |
05:04:17.80 |
+60:31:47.8 |
HIP 23522 |
8.35 |
| 2026-08-17 12:00 |
05:04:20.24 |
+60:32:21.1 |
HIP 23522 |
8.94 |
| 2026-08-18 00:00 |
05:04:22.61 |
+60:32:54.6 |
HIP 23522 |
9.53 |
| 2026-08-18 12:00 |
05:04:24.91 |
+60:33:28.1 |
HIP 23522 |
10.11 |
| 2026-08-19 00:00 |
05:04:27.15 |
+60:34:01.8 |
HIP 23522 |
10.70 |