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) |
| 2026-03-26 00:00 |
08:17:04.41 |
+05:13:50.9 |
HIP 40684 |
21.34 |
| 2026-03-26 12:00 |
08:17:02.46 |
+05:14:06.3 |
HIP 40684 |
21.88 |
| 2026-03-27 00:00 |
08:17:00.54 |
+05:14:21.5 |
HIP 40684 |
22.43 |
| 2026-03-27 12:00 |
08:16:58.65 |
+05:14:36.7 |
HIP 40684 |
22.96 |
| 2026-03-28 00:00 |
08:16:56.79 |
+05:14:51.9 |
HIP 40684 |
23.49 |
| 2026-03-28 12:00 |
08:16:54.97 |
+05:15:07.0 |
HIP 40684 |
24.00 |
| 2026-03-29 00:00 |
08:16:53.18 |
+05:15:22.0 |
HIP 40684 |
24.52 |
| 2026-03-29 12:00 |
08:16:51.42 |
+05:15:37.0 |
HIP 40684 |
25.02 |
| 2026-03-30 00:00 |
08:16:49.69 |
+05:15:51.9 |
HIP 40684 |
25.51 |
| 2026-03-30 12:00 |
08:16:48.00 |
+05:16:06.7 |
HIP 40684 |
26.00 |
| 2026-03-31 00:00 |
08:16:46.34 |
+05:16:21.5 |
HIP 40684 |
26.48 |
| 2026-03-31 12:00 |
08:16:44.71 |
+05:16:36.2 |
HIP 40684 |
26.95 |
| 2026-04-01 00:00 |
08:16:43.11 |
+05:16:50.9 |
HIP 40425 |
27.26 |
| 2026-04-01 12:00 |
08:16:41.55 |
+05:17:05.5 |
HIP 40425 |
26.81 |
| 2026-04-02 00:00 |
08:16:40.02 |
+05:17:20.0 |
HIP 40425 |
26.36 |
| 2026-04-02 12:00 |
08:16:38.52 |
+05:17:34.4 |
HIP 40425 |
25.91 |
| 2026-04-03 00:00 |
08:16:37.05 |
+05:17:48.8 |
HIP 40425 |
25.48 |
| 2026-04-03 12:00 |
08:16:35.62 |
+05:18:03.1 |
HIP 40425 |
25.05 |
| 2026-04-04 00:00 |
08:16:34.22 |
+05:18:17.3 |
HIP 40425 |
24.63 |
| 2026-04-04 12:00 |
08:16:32.86 |
+05:18:31.5 |
HIP 40425 |
24.22 |
| 2026-04-05 00:00 |
08:16:31.53 |
+05:18:45.6 |
HIP 40425 |
23.81 |
| 2026-04-05 12:00 |
08:16:30.23 |
+05:18:59.6 |
HIP 40425 |
23.41 |
| 2026-04-06 00:00 |
08:16:28.96 |
+05:19:13.5 |
HIP 40425 |
23.02 |
| 2026-04-06 12:00 |
08:16:27.73 |
+05:19:27.3 |
HIP 40425 |
22.64 |
| 2026-04-07 00:00 |
08:16:26.53 |
+05:19:41.1 |
HIP 40425 |
22.26 |
| 2026-04-07 12:00 |
08:16:25.37 |
+05:19:54.8 |
HIP 40425 |
21.89 |
| 2026-04-08 00:00 |
08:16:24.24 |
+05:20:08.4 |
HIP 40425 |
21.53 |
| 2026-04-08 12:00 |
08:16:23.14 |
+05:20:21.9 |
HIP 40425 |
21.18 |
| 2026-04-09 00:00 |
08:16:22.08 |
+05:20:35.3 |
HIP 40425 |
20.83 |
| 2026-04-09 12:00 |
08:16:21.05 |
+05:20:48.7 |
HIP 40425 |
20.49 |
| 2026-04-10 00:00 |
08:16:20.05 |
+05:21:01.9 |
HIP 40425 |
20.16 |
| 2026-04-10 12:00 |
08:16:19.09 |
+05:21:15.1 |
HIP 40425 |
19.84 |
| 2026-04-11 00:00 |
08:16:18.16 |
+05:21:28.1 |
HIP 40425 |
19.52 |
| 2026-04-11 12:00 |
08:16:17.26 |
+05:21:41.1 |
HIP 40425 |
19.21 |
| 2026-04-12 00:00 |
08:16:16.40 |
+05:21:54.0 |
HIP 40425 |
18.91 |
| 2026-04-12 12:00 |
08:16:15.57 |
+05:22:06.8 |
HIP 40425 |
18.62 |
| 2026-04-13 00:00 |
08:16:14.78 |
+05:22:19.5 |
HIP 40425 |
18.34 |
| 2026-04-13 12:00 |
08:16:14.02 |
+05:22:32.1 |
HIP 40425 |
18.06 |
| 2026-04-14 00:00 |
08:16:13.30 |
+05:22:44.5 |
HIP 40425 |
17.79 |
| 2026-04-14 12:00 |
08:16:12.61 |
+05:22:56.9 |
HIP 40425 |
17.53 |
| 2026-04-15 00:00 |
08:16:11.95 |
+05:23:09.2 |
HIP 40425 |
17.28 |
| 2026-04-15 12:00 |
08:16:11.33 |
+05:23:21.4 |
HIP 40425 |
17.03 |
| 2026-04-16 00:00 |
08:16:10.74 |
+05:23:33.5 |
HIP 40425 |
16.80 |