メタデータ
| 項目 |
値 |
| Designation |
C/2002 K1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-06-16T10:53:15.109440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:15Z |
| Obs used |
72 |
| 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) |
2002-06-23.0000000 |
| e |
0.99963588 |
| q (au) |
3.230234 |
| a (au) |
8871.406661 |
| i (deg) |
89.721779 |
| Ω (om, deg) |
280.548361 |
| ω (w, deg) |
4.460611 |
| M (ma, deg) |
0.000008 |
等級
散乱 + 全体線形
$$
M_a = (12.822 + 2.135\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.822 |
| n |
2.135 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| 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 |
06:51:15.92 |
+49:38:59.3 |
HIP 33051 |
19.11 |
| 2026-05-12 12:00 |
06:51:18.46 |
+49:38:41.0 |
HIP 33051 |
18.61 |
| 2026-05-13 00:00 |
06:51:21.03 |
+49:38:22.9 |
HIP 33051 |
18.12 |
| 2026-05-13 12:00 |
06:51:23.62 |
+49:38:04.8 |
HIP 33051 |
17.62 |
| 2026-05-14 00:00 |
06:51:26.23 |
+49:37:46.9 |
HIP 33051 |
17.12 |
| 2026-05-14 12:00 |
06:51:28.88 |
+49:37:29.0 |
HIP 33051 |
16.62 |
| 2026-05-15 00:00 |
06:51:31.54 |
+49:37:11.1 |
HIP 33051 |
16.12 |
| 2026-05-15 12:00 |
06:51:34.23 |
+49:36:53.4 |
HIP 33051 |
15.61 |
| 2026-05-16 00:00 |
06:51:36.95 |
+49:36:35.8 |
HIP 33051 |
15.10 |
| 2026-05-16 12:00 |
06:51:39.68 |
+49:36:18.2 |
HIP 33051 |
14.59 |
| 2026-05-17 00:00 |
06:51:42.45 |
+49:36:00.7 |
HIP 33051 |
14.08 |
| 2026-05-17 12:00 |
06:51:45.23 |
+49:35:43.3 |
HIP 33051 |
13.57 |
| 2026-05-18 00:00 |
06:51:48.04 |
+49:35:26.0 |
HIP 33051 |
13.05 |
| 2026-05-18 12:00 |
06:51:50.88 |
+49:35:08.8 |
HIP 33051 |
12.54 |
| 2026-05-19 00:00 |
06:51:53.73 |
+49:34:51.7 |
HIP 33051 |
12.02 |
| 2026-05-19 12:00 |
06:51:56.61 |
+49:34:34.7 |
HIP 33051 |
11.50 |
| 2026-05-20 00:00 |
06:51:59.51 |
+49:34:17.7 |
HIP 33051 |
10.98 |
| 2026-05-20 12:00 |
06:52:02.43 |
+49:34:00.9 |
HIP 33051 |
10.46 |
| 2026-05-21 00:00 |
06:52:05.38 |
+49:33:44.1 |
HIP 33051 |
9.94 |
| 2026-05-21 12:00 |
06:52:08.35 |
+49:33:27.5 |
HIP 33051 |
9.42 |
| 2026-05-22 00:00 |
06:52:11.33 |
+49:33:10.9 |
HIP 33051 |
8.90 |
| 2026-05-22 12:00 |
06:52:14.34 |
+49:32:54.4 |
HIP 33051 |
8.39 |
| 2026-05-23 00:00 |
06:52:17.37 |
+49:32:38.1 |
HIP 33051 |
7.87 |
| 2026-05-23 12:00 |
06:52:20.42 |
+49:32:21.8 |
HIP 33051 |
7.37 |
| 2026-05-24 00:00 |
06:52:23.49 |
+49:32:05.6 |
HIP 33051 |
6.86 |
| 2026-05-24 12:00 |
06:52:26.59 |
+49:31:49.5 |
HIP 33051 |
6.36 |
| 2026-05-25 00:00 |
06:52:29.70 |
+49:31:33.6 |
HIP 33051 |
5.88 |
| 2026-05-25 12:00 |
06:52:32.83 |
+49:31:17.7 |
HIP 33051 |
5.40 |
| 2026-05-26 00:00 |
06:52:35.98 |
+49:31:01.9 |
HIP 33051 |
4.94 |
| 2026-05-26 12:00 |
06:52:39.15 |
+49:30:46.2 |
HIP 33051 |
4.51 |
| 2026-05-27 00:00 |
06:52:42.34 |
+49:30:30.7 |
HIP 33051 |
4.10 |
| 2026-05-27 12:00 |
06:52:45.55 |
+49:30:15.2 |
HIP 33051 |
3.74 |
| 2026-05-28 00:00 |
06:52:48.77 |
+49:29:59.8 |
HIP 33051 |
3.44 |
| 2026-05-28 12:00 |
06:52:52.02 |
+49:29:44.6 |
HIP 33051 |
3.21 |
| 2026-05-29 00:00 |
06:52:55.28 |
+49:29:29.4 |
HIP 33051 |
3.07 |
| 2026-05-29 12:00 |
06:52:58.56 |
+49:29:14.4 |
HIP 33051 |
3.04 |
| 2026-05-30 00:00 |
06:53:01.86 |
+49:28:59.4 |
HIP 33051 |
3.12 |
| 2026-05-30 12:00 |
06:53:05.18 |
+49:28:44.6 |
HIP 33051 |
3.31 |
| 2026-05-31 00:00 |
06:53:08.51 |
+49:28:29.9 |
HIP 33051 |
3.58 |
| 2026-05-31 12:00 |
06:53:11.86 |
+49:28:15.2 |
HIP 33051 |
3.92 |
| 2026-06-01 00:00 |
06:53:15.23 |
+49:28:00.7 |
HIP 33051 |
4.32 |
| 2026-06-01 12:00 |
06:53:18.62 |
+49:27:46.3 |
HIP 33051 |
4.76 |
| 2026-06-02 00:00 |
06:53:22.02 |
+49:27:32.0 |
HIP 33051 |
5.23 |