メタデータ
| 項目 |
値 |
| Designation |
C/2006 K4 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-11-29T07:13:52.665600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:58Z |
| Obs used |
470 |
| NEO |
- |
| M1 |
11.600 |
| 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) |
2007-06-04.0000000 |
| e |
0.99824946 |
| q (au) |
3.188616 |
| a (au) |
1821.503573 |
| i (deg) |
111.333754 |
| Ω (om, deg) |
116.596913 |
| ω (w, deg) |
233.604103 |
| M (ma, deg) |
359.997739 |
等級
散乱 + 全体線形
$$
M_a = (13.480 + 2.073\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.480 |
| n |
2.073 |
| gf |
0.975 |
| gb |
-0.678 |
| k |
0.800 |
| δ90 |
9.980 |
| 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 |
| 2006-05-18 |
2007-09-08 |
+1.1886 |
-1.214 |
| 2008-01-26 |
2009-11-20 |
+0.0139 |
-0.066 |
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 |
07:38:37.93 |
+39:22:44.7 |
HIP 37075 |
29.45 |
| 2026-07-29 12:00 |
07:38:41.72 |
+39:22:44.1 |
HIP 37075 |
29.90 |
| 2026-07-30 00:00 |
07:38:45.51 |
+39:22:43.6 |
HIP 37409 |
30.16 |
| 2026-07-30 12:00 |
07:38:49.29 |
+39:22:43.3 |
HIP 37409 |
29.58 |
| 2026-07-31 00:00 |
07:38:53.06 |
+39:22:43.1 |
HIP 37443 |
28.92 |
| 2026-07-31 12:00 |
07:38:56.83 |
+39:22:43.0 |
HIP 37443 |
28.23 |
| 2026-08-01 00:00 |
07:39:00.58 |
+39:22:43.1 |
HIP 37443 |
27.55 |
| 2026-08-01 12:00 |
07:39:04.33 |
+39:22:43.2 |
HIP 37443 |
26.88 |
| 2026-08-02 00:00 |
07:39:08.07 |
+39:22:43.6 |
HIP 37443 |
26.21 |
| 2026-08-02 12:00 |
07:39:11.80 |
+39:22:44.0 |
HIP 37443 |
25.55 |
| 2026-08-03 00:00 |
07:39:15.52 |
+39:22:44.5 |
HIP 37443 |
24.90 |
| 2026-08-03 12:00 |
07:39:19.23 |
+39:22:45.2 |
HIP 37443 |
24.24 |
| 2026-08-04 00:00 |
07:39:22.93 |
+39:22:46.0 |
HIP 37443 |
23.60 |
| 2026-08-04 12:00 |
07:39:26.62 |
+39:22:47.0 |
HIP 37443 |
22.96 |
| 2026-08-05 00:00 |
07:39:30.30 |
+39:22:48.0 |
HIP 37443 |
22.33 |
| 2026-08-05 12:00 |
07:39:33.96 |
+39:22:49.2 |
HIP 37443 |
21.71 |
| 2026-08-06 00:00 |
07:39:37.62 |
+39:22:50.5 |
HIP 37443 |
21.10 |
| 2026-08-06 12:00 |
07:39:41.27 |
+39:22:52.0 |
HIP 37443 |
20.50 |
| 2026-08-07 00:00 |
07:39:44.90 |
+39:22:53.6 |
HIP 37443 |
19.90 |
| 2026-08-07 12:00 |
07:39:48.53 |
+39:22:55.3 |
HIP 37443 |
19.32 |
| 2026-08-08 00:00 |
07:39:52.14 |
+39:22:57.1 |
HIP 37443 |
18.74 |
| 2026-08-08 12:00 |
07:39:55.74 |
+39:22:59.1 |
HIP 37443 |
18.18 |
| 2026-08-09 00:00 |
07:39:59.33 |
+39:23:01.2 |
HIP 37443 |
17.64 |
| 2026-08-09 12:00 |
07:40:02.90 |
+39:23:03.4 |
HIP 37443 |
17.10 |
| 2026-08-10 00:00 |
07:40:06.46 |
+39:23:05.7 |
HIP 37443 |
16.58 |
| 2026-08-10 12:00 |
07:40:10.01 |
+39:23:08.2 |
HIP 37443 |
16.08 |
| 2026-08-11 00:00 |
07:40:13.55 |
+39:23:10.9 |
HIP 37443 |
15.60 |
| 2026-08-11 12:00 |
07:40:17.07 |
+39:23:13.6 |
HIP 37443 |
15.13 |
| 2026-08-12 00:00 |
07:40:20.58 |
+39:23:16.5 |
HIP 37443 |
14.69 |
| 2026-08-12 12:00 |
07:40:24.07 |
+39:23:19.5 |
HIP 37443 |
14.26 |
| 2026-08-13 00:00 |
07:40:27.55 |
+39:23:22.7 |
HIP 37443 |
13.86 |
| 2026-08-13 12:00 |
07:40:31.01 |
+39:23:26.0 |
HIP 37443 |
13.49 |
| 2026-08-14 00:00 |
07:40:34.46 |
+39:23:29.4 |
HIP 37443 |
13.14 |
| 2026-08-14 12:00 |
07:40:37.90 |
+39:23:32.9 |
HIP 37443 |
12.82 |
| 2026-08-15 00:00 |
07:40:41.31 |
+39:23:36.6 |
HIP 37443 |
12.54 |
| 2026-08-15 12:00 |
07:40:44.72 |
+39:23:40.4 |
HIP 37443 |
12.28 |
| 2026-08-16 00:00 |
07:40:48.10 |
+39:23:44.4 |
HIP 37443 |
12.06 |
| 2026-08-16 12:00 |
07:40:51.47 |
+39:23:48.5 |
HIP 37443 |
11.88 |
| 2026-08-17 00:00 |
07:40:54.83 |
+39:23:52.7 |
HIP 37443 |
11.73 |
| 2026-08-17 12:00 |
07:40:58.16 |
+39:23:57.0 |
HIP 37443 |
11.62 |
| 2026-08-18 00:00 |
07:41:01.48 |
+39:24:01.5 |
HIP 37443 |
11.55 |
| 2026-08-18 12:00 |
07:41:04.79 |
+39:24:06.1 |
HIP 37443 |
11.52 |
| 2026-08-19 00:00 |
07:41:08.07 |
+39:24:10.9 |
HIP 37443 |
11.52 |