メタデータ
| 項目 |
値 |
| Designation |
C/2002 K4 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-07-12T23:22:20.225280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:17Z |
| Obs used |
243 |
| NEO |
- |
| M1 |
11.400 |
| 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) |
2002-07-12.0000000 |
| e |
0.84228241 |
| q (au) |
2.764517 |
| a (au) |
17.528275 |
| i (deg) |
94.062769 |
| Ω (om, deg) |
308.099007 |
| ω (w, deg) |
24.431756 |
| M (ma, deg) |
359.986921 |
等級
散乱 + 全体線形
$$
M_a = (12.935 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.935 |
| n |
2.000 |
| gf |
0.998 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
10.000 |
| 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 |
08:16:26.04 |
+05:31:15.2 |
HIP 40428 |
17.61 |
| 2026-05-12 12:00 |
08:16:27.18 |
+05:31:20.5 |
HIP 40428 |
17.88 |
| 2026-05-13 00:00 |
08:16:28.35 |
+05:31:25.7 |
HIP 40428 |
18.16 |
| 2026-05-13 12:00 |
08:16:29.56 |
+05:31:30.7 |
HIP 40428 |
18.45 |
| 2026-05-14 00:00 |
08:16:30.79 |
+05:31:35.6 |
HIP 40428 |
18.75 |
| 2026-05-14 12:00 |
08:16:32.05 |
+05:31:40.3 |
HIP 40428 |
19.05 |
| 2026-05-15 00:00 |
08:16:33.35 |
+05:31:44.9 |
HIP 40428 |
19.37 |
| 2026-05-15 12:00 |
08:16:34.67 |
+05:31:49.3 |
HIP 40428 |
19.69 |
| 2026-05-16 00:00 |
08:16:36.02 |
+05:31:53.5 |
HIP 40428 |
20.02 |
| 2026-05-16 12:00 |
08:16:37.40 |
+05:31:57.7 |
HIP 40428 |
20.36 |
| 2026-05-17 00:00 |
08:16:38.82 |
+05:32:01.6 |
HIP 40428 |
20.70 |
| 2026-05-17 12:00 |
08:16:40.26 |
+05:32:05.4 |
HIP 40428 |
21.06 |
| 2026-05-18 00:00 |
08:16:41.73 |
+05:32:09.1 |
HIP 40428 |
21.42 |
| 2026-05-18 12:00 |
08:16:43.23 |
+05:32:12.6 |
HIP 40428 |
21.79 |
| 2026-05-19 00:00 |
08:16:44.76 |
+05:32:15.9 |
HIP 40428 |
22.16 |
| 2026-05-19 12:00 |
08:16:46.31 |
+05:32:19.1 |
HIP 40428 |
22.55 |
| 2026-05-20 00:00 |
08:16:47.90 |
+05:32:22.2 |
HIP 40428 |
22.94 |
| 2026-05-20 12:00 |
08:16:49.51 |
+05:32:25.1 |
HIP 40428 |
23.34 |
| 2026-05-21 00:00 |
08:16:51.15 |
+05:32:27.8 |
HIP 40428 |
23.74 |
| 2026-05-21 12:00 |
08:16:52.82 |
+05:32:30.4 |
HIP 40428 |
24.16 |
| 2026-05-22 00:00 |
08:16:54.52 |
+05:32:32.8 |
HIP 40428 |
24.58 |
| 2026-05-22 12:00 |
08:16:56.24 |
+05:32:35.1 |
HIP 40428 |
25.00 |
| 2026-05-23 00:00 |
08:16:58.00 |
+05:32:37.2 |
HIP 40428 |
25.44 |
| 2026-05-23 12:00 |
08:16:59.78 |
+05:32:39.1 |
HIP 40428 |
25.88 |
| 2026-05-24 00:00 |
08:17:01.58 |
+05:32:40.9 |
HIP 40428 |
26.33 |
| 2026-05-24 12:00 |
08:17:03.42 |
+05:32:42.6 |
HIP 40428 |
26.78 |
| 2026-05-25 00:00 |
08:17:05.28 |
+05:32:44.1 |
HIP 40428 |
27.25 |
| 2026-05-25 12:00 |
08:17:07.16 |
+05:32:45.4 |
HIP 40428 |
27.71 |
| 2026-05-26 00:00 |
08:17:09.08 |
+05:32:46.6 |
HIP 40428 |
28.19 |
| 2026-05-26 12:00 |
08:17:11.02 |
+05:32:47.6 |
HIP 40428 |
28.67 |
| 2026-05-27 00:00 |
08:17:12.98 |
+05:32:48.4 |
HIP 40428 |
29.16 |
| 2026-05-27 12:00 |
08:17:14.97 |
+05:32:49.1 |
HIP 40704 |
29.09 |
| 2026-05-28 00:00 |
08:17:16.99 |
+05:32:49.7 |
HIP 40704 |
28.76 |
| 2026-05-28 12:00 |
08:17:19.03 |
+05:32:50.1 |
HIP 40704 |
28.44 |
| 2026-05-29 00:00 |
08:17:21.10 |
+05:32:50.3 |
HIP 40704 |
28.11 |
| 2026-05-29 12:00 |
08:17:23.19 |
+05:32:50.4 |
HIP 40704 |
27.78 |
| 2026-05-30 00:00 |
08:17:25.31 |
+05:32:50.3 |
HIP 40704 |
27.46 |
| 2026-05-30 12:00 |
08:17:27.46 |
+05:32:50.0 |
HIP 40704 |
27.13 |
| 2026-05-31 00:00 |
08:17:29.62 |
+05:32:49.6 |
HIP 40704 |
26.81 |
| 2026-05-31 12:00 |
08:17:31.82 |
+05:32:49.1 |
HIP 40704 |
26.48 |
| 2026-06-01 00:00 |
08:17:34.03 |
+05:32:48.4 |
HIP 40704 |
26.16 |
| 2026-06-01 12:00 |
08:17:36.27 |
+05:32:47.5 |
HIP 40704 |
25.84 |
| 2026-06-02 00:00 |
08:17:38.54 |
+05:32:46.5 |
HIP 40704 |
25.53 |