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) |
| 2026-05-12 00:00 |
11:39:44.89 |
+64:25:21.0 |
HIP 56816 |
7.54 |
| 2026-05-12 12:00 |
11:39:40.53 |
+64:24:48.6 |
HIP 56816 |
6.84 |
| 2026-05-13 00:00 |
11:39:36.23 |
+64:24:16.0 |
HIP 56816 |
6.15 |
| 2026-05-13 12:00 |
11:39:31.98 |
+64:23:43.0 |
HIP 56816 |
5.47 |
| 2026-05-14 00:00 |
11:39:27.78 |
+64:23:09.9 |
HIP 56816 |
4.79 |
| 2026-05-14 12:00 |
11:39:23.64 |
+64:22:36.4 |
HIP 56816 |
4.14 |
| 2026-05-15 00:00 |
11:39:19.55 |
+64:22:02.8 |
HIP 56816 |
3.51 |
| 2026-05-15 12:00 |
11:39:15.51 |
+64:21:28.8 |
HIP 56816 |
2.93 |
| 2026-05-16 00:00 |
11:39:11.54 |
+64:20:54.7 |
HIP 56816 |
2.43 |
| 2026-05-16 12:00 |
11:39:07.62 |
+64:20:20.2 |
HIP 56816 |
2.06 |
| 2026-05-17 00:00 |
11:39:03.75 |
+64:19:45.6 |
HIP 56816 |
1.90 |
| 2026-05-17 12:00 |
11:38:59.94 |
+64:19:10.7 |
HIP 56816 |
2.02 |
| 2026-05-18 00:00 |
11:38:56.18 |
+64:18:35.6 |
HIP 56816 |
2.35 |
| 2026-05-18 12:00 |
11:38:52.49 |
+64:18:00.2 |
HIP 56816 |
2.84 |
| 2026-05-19 00:00 |
11:38:48.85 |
+64:17:24.6 |
HIP 56816 |
3.41 |
| 2026-05-19 12:00 |
11:38:45.26 |
+64:16:48.8 |
HIP 56816 |
4.03 |
| 2026-05-20 00:00 |
11:38:41.73 |
+64:16:12.7 |
HIP 56816 |
4.67 |
| 2026-05-20 12:00 |
11:38:38.26 |
+64:15:36.5 |
HIP 56773 |
5.29 |
| 2026-05-21 00:00 |
11:38:34.85 |
+64:15:00.0 |
HIP 56773 |
4.59 |
| 2026-05-21 12:00 |
11:38:31.49 |
+64:14:23.3 |
HIP 56773 |
3.90 |
| 2026-05-22 00:00 |
11:38:28.19 |
+64:13:46.4 |
HIP 56773 |
3.23 |
| 2026-05-22 12:00 |
11:38:24.95 |
+64:13:09.3 |
HIP 56773 |
2.56 |
| 2026-05-23 00:00 |
11:38:21.76 |
+64:12:32.0 |
HIP 56773 |
1.93 |
| 2026-05-23 12:00 |
11:38:18.64 |
+64:11:54.5 |
HIP 56773 |
1.36 |
| 2026-05-24 00:00 |
11:38:15.56 |
+64:11:16.8 |
HIP 56773 |
1.01 |
| 2026-05-24 12:00 |
11:38:12.55 |
+64:10:38.9 |
HIP 56773 |
1.08 |
| 2026-05-25 00:00 |
11:38:09.60 |
+64:10:00.9 |
HIP 56773 |
1.52 |
| 2026-05-25 12:00 |
11:38:06.70 |
+64:09:22.6 |
HIP 56773 |
2.11 |
| 2026-05-26 00:00 |
11:38:03.86 |
+64:08:44.1 |
HIP 56773 |
2.76 |
| 2026-05-26 12:00 |
11:38:01.07 |
+64:08:05.5 |
HIP 56773 |
3.43 |
| 2026-05-27 00:00 |
11:37:58.35 |
+64:07:26.7 |
HIP 56773 |
4.11 |
| 2026-05-27 12:00 |
11:37:55.68 |
+64:06:47.7 |
HIP 56773 |
4.80 |
| 2026-05-28 00:00 |
11:37:53.07 |
+64:06:08.5 |
HIP 56773 |
5.50 |
| 2026-05-28 12:00 |
11:37:50.52 |
+64:05:29.2 |
HIP 56773 |
6.20 |
| 2026-05-29 00:00 |
11:37:48.03 |
+64:04:49.7 |
HIP 56773 |
6.89 |
| 2026-05-29 12:00 |
11:37:45.59 |
+64:04:10.0 |
HIP 56773 |
7.60 |
| 2026-05-30 00:00 |
11:37:43.21 |
+64:03:30.2 |
HIP 56773 |
8.30 |
| 2026-05-30 12:00 |
11:37:40.89 |
+64:02:50.2 |
HIP 56773 |
9.00 |
| 2026-05-31 00:00 |
11:37:38.63 |
+64:02:10.1 |
HIP 56773 |
9.70 |
| 2026-05-31 12:00 |
11:37:36.42 |
+64:01:29.8 |
HIP 56773 |
10.41 |
| 2026-06-01 00:00 |
11:37:34.28 |
+64:00:49.3 |
HIP 56773 |
11.11 |
| 2026-06-01 12:00 |
11:37:32.19 |
+64:00:08.8 |
HIP 56773 |
11.82 |
| 2026-06-02 00:00 |
11:37:30.16 |
+63:59:28.0 |
HIP 56773 |
12.52 |