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) |
| 2026-03-26 00:00 |
04:36:47.26 |
+60:24:49.6 |
HIP 21571 |
17.65 |
| 2026-03-26 12:00 |
04:36:50.08 |
+60:24:12.9 |
HIP 21571 |
18.05 |
| 2026-03-27 00:00 |
04:36:52.96 |
+60:23:36.6 |
HIP 21571 |
18.46 |
| 2026-03-27 12:00 |
04:36:55.91 |
+60:23:00.4 |
HIP 21544 |
18.16 |
| 2026-03-28 00:00 |
04:36:58.91 |
+60:22:24.4 |
HIP 21544 |
17.49 |
| 2026-03-28 12:00 |
04:37:01.98 |
+60:21:48.7 |
HIP 21544 |
16.82 |
| 2026-03-29 00:00 |
04:37:05.11 |
+60:21:13.2 |
HIP 21544 |
16.16 |
| 2026-03-29 12:00 |
04:37:08.30 |
+60:20:37.9 |
HIP 21544 |
15.50 |
| 2026-03-30 00:00 |
04:37:11.55 |
+60:20:02.8 |
HIP 21544 |
14.86 |
| 2026-03-30 12:00 |
04:37:14.86 |
+60:19:28.0 |
HIP 21544 |
14.22 |
| 2026-03-31 00:00 |
04:37:18.23 |
+60:18:53.4 |
HIP 21544 |
13.59 |
| 2026-03-31 12:00 |
04:37:21.66 |
+60:18:19.0 |
HIP 21544 |
12.97 |
| 2026-04-01 00:00 |
04:37:25.15 |
+60:17:44.9 |
HIP 21544 |
12.36 |
| 2026-04-01 12:00 |
04:37:28.69 |
+60:17:11.0 |
HIP 21544 |
11.77 |
| 2026-04-02 00:00 |
04:37:32.30 |
+60:16:37.3 |
HIP 21544 |
11.20 |
| 2026-04-02 12:00 |
04:37:35.96 |
+60:16:03.9 |
HIP 21544 |
10.65 |
| 2026-04-03 00:00 |
04:37:39.67 |
+60:15:30.7 |
HIP 21544 |
10.13 |
| 2026-04-03 12:00 |
04:37:43.45 |
+60:14:57.7 |
HIP 21544 |
9.64 |
| 2026-04-04 00:00 |
04:37:47.28 |
+60:14:25.0 |
HIP 21544 |
9.18 |
| 2026-04-04 12:00 |
04:37:51.16 |
+60:13:52.5 |
HIP 21544 |
8.77 |
| 2026-04-05 00:00 |
04:37:55.10 |
+60:13:20.3 |
HIP 21544 |
8.41 |
| 2026-04-05 12:00 |
04:37:59.10 |
+60:12:48.3 |
HIP 21544 |
8.10 |
| 2026-04-06 00:00 |
04:38:03.15 |
+60:12:16.6 |
HIP 21544 |
7.85 |
| 2026-04-06 12:00 |
04:38:07.26 |
+60:11:45.1 |
HIP 21544 |
7.67 |
| 2026-04-07 00:00 |
04:38:11.42 |
+60:11:13.8 |
HIP 21544 |
7.57 |
| 2026-04-07 12:00 |
04:38:15.63 |
+60:10:42.8 |
HIP 21544 |
7.55 |
| 2026-04-08 00:00 |
04:38:19.89 |
+60:10:12.1 |
HIP 21544 |
7.60 |
| 2026-04-08 12:00 |
04:38:24.21 |
+60:09:41.6 |
HIP 21544 |
7.74 |
| 2026-04-09 00:00 |
04:38:28.58 |
+60:09:11.4 |
HIP 21544 |
7.95 |
| 2026-04-09 12:00 |
04:38:33.01 |
+60:08:41.4 |
HIP 21544 |
8.22 |
| 2026-04-10 00:00 |
04:38:37.48 |
+60:08:11.7 |
HIP 21544 |
8.57 |
| 2026-04-10 12:00 |
04:38:42.01 |
+60:07:42.2 |
HIP 21544 |
8.97 |
| 2026-04-11 00:00 |
04:38:46.58 |
+60:07:13.0 |
HIP 21544 |
9.41 |
| 2026-04-11 12:00 |
04:38:51.21 |
+60:06:44.0 |
HIP 21544 |
9.91 |
| 2026-04-12 00:00 |
04:38:55.89 |
+60:06:15.4 |
HIP 21544 |
10.44 |
| 2026-04-12 12:00 |
04:39:00.61 |
+60:05:46.9 |
HIP 21544 |
11.00 |
| 2026-04-13 00:00 |
04:39:05.39 |
+60:05:18.8 |
HIP 21544 |
11.59 |
| 2026-04-13 12:00 |
04:39:10.21 |
+60:04:50.9 |
HIP 21544 |
12.21 |
| 2026-04-14 00:00 |
04:39:15.09 |
+60:04:23.3 |
HIP 21544 |
12.84 |
| 2026-04-14 12:00 |
04:39:20.01 |
+60:03:55.9 |
HIP 21544 |
13.50 |
| 2026-04-15 00:00 |
04:39:24.97 |
+60:03:28.8 |
HIP 21544 |
14.17 |
| 2026-04-15 12:00 |
04:39:29.99 |
+60:03:02.0 |
HIP 21544 |
14.86 |
| 2026-04-16 00:00 |
04:39:35.05 |
+60:02:35.5 |
HIP 21544 |
15.56 |