メタデータ
| 項目 |
値 |
| Designation |
C/2007 K6 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-07-01T11:27:01.267200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:09Z |
| Obs used |
44 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2007-07-12.0000000 |
| e |
0.98462944 |
| q (au) |
3.432981 |
| a (au) |
223.347812 |
| i (deg) |
105.063716 |
| Ω (om, deg) |
298.075171 |
| ω (w, deg) |
337.140500 |
| M (ma, deg) |
0.003107 |
等級
散乱 + 全体線形
$$
M_a = (12.690 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.690 |
| n |
2.000 |
| gf |
0.958 |
| gb |
-0.832 |
| k |
0.999 |
| δ90 |
9.140 |
| 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 |
11:49:46.60 |
+64:51:10.3 |
HIP 57967 |
25.90 |
| 2026-03-26 12:00 |
11:49:38.88 |
+64:51:11.9 |
HIP 57967 |
26.61 |
| 2026-03-27 00:00 |
11:49:31.16 |
+64:51:13.1 |
HIP 57967 |
27.33 |
| 2026-03-27 12:00 |
11:49:23.46 |
+64:51:13.9 |
HIP 57967 |
28.06 |
| 2026-03-28 00:00 |
11:49:15.77 |
+64:51:14.2 |
HIP 57967 |
28.80 |
| 2026-03-28 12:00 |
11:49:08.09 |
+64:51:14.2 |
HIP 57967 |
29.54 |
| 2026-03-29 00:00 |
11:49:00.43 |
+64:51:13.7 |
HIP 57967 |
30.29 |
| 2026-03-29 12:00 |
11:48:52.78 |
+64:51:12.8 |
HIP 57495 |
29.96 |
| 2026-03-30 00:00 |
11:48:45.15 |
+64:51:11.4 |
HIP 57495 |
29.63 |
| 2026-03-30 12:00 |
11:48:37.53 |
+64:51:09.7 |
HIP 57495 |
29.32 |
| 2026-03-31 00:00 |
11:48:29.93 |
+64:51:07.5 |
HIP 57495 |
29.02 |
| 2026-03-31 12:00 |
11:48:22.34 |
+64:51:05.0 |
HIP 57221 |
28.58 |
| 2026-04-01 00:00 |
11:48:14.77 |
+64:51:02.0 |
HIP 57221 |
27.81 |
| 2026-04-01 12:00 |
11:48:07.23 |
+64:50:58.6 |
HIP 57221 |
27.05 |
| 2026-04-02 00:00 |
11:47:59.70 |
+64:50:54.7 |
HIP 57221 |
26.30 |
| 2026-04-02 12:00 |
11:47:52.18 |
+64:50:50.5 |
HIP 57221 |
25.55 |
| 2026-04-03 00:00 |
11:47:44.69 |
+64:50:45.9 |
HIP 57221 |
24.81 |
| 2026-04-03 12:00 |
11:47:37.22 |
+64:50:40.8 |
HIP 57221 |
24.08 |
| 2026-04-04 00:00 |
11:47:29.77 |
+64:50:35.3 |
HIP 57221 |
23.35 |
| 2026-04-04 12:00 |
11:47:22.34 |
+64:50:29.5 |
HIP 57221 |
22.64 |
| 2026-04-05 00:00 |
11:47:14.94 |
+64:50:23.2 |
HIP 57221 |
21.93 |
| 2026-04-05 12:00 |
11:47:07.56 |
+64:50:16.5 |
HIP 57221 |
21.24 |
| 2026-04-06 00:00 |
11:47:00.19 |
+64:50:09.4 |
HIP 57221 |
20.56 |
| 2026-04-06 12:00 |
11:46:52.86 |
+64:50:01.8 |
HIP 57221 |
19.89 |
| 2026-04-07 00:00 |
11:46:45.55 |
+64:49:53.9 |
HIP 57221 |
19.23 |
| 2026-04-07 12:00 |
11:46:38.26 |
+64:49:45.6 |
HIP 57221 |
18.59 |
| 2026-04-08 00:00 |
11:46:31.00 |
+64:49:36.9 |
HIP 57221 |
17.97 |
| 2026-04-08 12:00 |
11:46:23.76 |
+64:49:27.7 |
HIP 57221 |
17.36 |
| 2026-04-09 00:00 |
11:46:16.56 |
+64:49:18.2 |
HIP 57221 |
16.78 |
| 2026-04-09 12:00 |
11:46:09.37 |
+64:49:08.3 |
HIP 57221 |
16.22 |
| 2026-04-10 00:00 |
11:46:02.22 |
+64:48:57.9 |
HIP 57221 |
15.68 |
| 2026-04-10 12:00 |
11:45:55.10 |
+64:48:47.2 |
HIP 57221 |
15.17 |
| 2026-04-11 00:00 |
11:45:48.00 |
+64:48:36.0 |
HIP 57221 |
14.69 |
| 2026-04-11 12:00 |
11:45:40.93 |
+64:48:24.5 |
HIP 57221 |
14.24 |
| 2026-04-12 00:00 |
11:45:33.90 |
+64:48:12.6 |
HIP 57221 |
13.83 |
| 2026-04-12 12:00 |
11:45:26.89 |
+64:48:00.2 |
HIP 57221 |
13.46 |
| 2026-04-13 00:00 |
11:45:19.92 |
+64:47:47.5 |
HIP 57221 |
13.13 |
| 2026-04-13 12:00 |
11:45:12.97 |
+64:47:34.4 |
HIP 57221 |
12.84 |
| 2026-04-14 00:00 |
11:45:06.06 |
+64:47:20.9 |
HIP 57221 |
12.60 |
| 2026-04-14 12:00 |
11:44:59.18 |
+64:47:07.0 |
HIP 57221 |
12.41 |
| 2026-04-15 00:00 |
11:44:52.34 |
+64:46:52.7 |
HIP 57221 |
12.28 |
| 2026-04-15 12:00 |
11:44:45.53 |
+64:46:38.1 |
HIP 57221 |
12.20 |
| 2026-04-16 00:00 |
11:44:38.75 |
+64:46:23.0 |
HIP 57221 |
12.17 |