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) |
| 2026-03-26 00:00 |
06:49:34.13 |
+50:10:51.6 |
HIP 33000 |
31.78 |
| 2026-03-26 12:00 |
06:49:33.61 |
+50:10:31.0 |
HIP 33000 |
31.70 |
| 2026-03-27 00:00 |
06:49:33.12 |
+50:10:10.3 |
HIP 33000 |
31.61 |
| 2026-03-27 12:00 |
06:49:32.67 |
+50:09:49.6 |
HIP 33000 |
31.53 |
| 2026-03-28 00:00 |
06:49:32.26 |
+50:09:28.8 |
HIP 33000 |
31.44 |
| 2026-03-28 12:00 |
06:49:31.88 |
+50:09:08.0 |
HIP 33000 |
31.35 |
| 2026-03-29 00:00 |
06:49:31.55 |
+50:08:47.2 |
HIP 33000 |
31.26 |
| 2026-03-29 12:00 |
06:49:31.24 |
+50:08:26.4 |
HIP 33000 |
31.17 |
| 2026-03-30 00:00 |
06:49:30.98 |
+50:08:05.5 |
HIP 33000 |
31.07 |
| 2026-03-30 12:00 |
06:49:30.75 |
+50:07:44.6 |
HIP 33000 |
30.98 |
| 2026-03-31 00:00 |
06:49:30.55 |
+50:07:23.7 |
HIP 33000 |
30.88 |
| 2026-03-31 12:00 |
06:49:30.40 |
+50:07:02.8 |
HIP 33000 |
30.78 |
| 2026-04-01 00:00 |
06:49:30.28 |
+50:06:41.8 |
HIP 33000 |
30.67 |
| 2026-04-01 12:00 |
06:49:30.19 |
+50:06:20.9 |
HIP 33000 |
30.57 |
| 2026-04-02 00:00 |
06:49:30.15 |
+50:05:59.9 |
HIP 33000 |
30.46 |
| 2026-04-02 12:00 |
06:49:30.13 |
+50:05:38.9 |
HIP 33000 |
30.36 |
| 2026-04-03 00:00 |
06:49:30.16 |
+50:05:17.9 |
HIP 33000 |
30.25 |
| 2026-04-03 12:00 |
06:49:30.22 |
+50:04:56.8 |
HIP 33000 |
30.13 |
| 2026-04-04 00:00 |
06:49:30.32 |
+50:04:35.8 |
HIP 33000 |
30.02 |
| 2026-04-04 12:00 |
06:49:30.45 |
+50:04:14.7 |
HIP 33000 |
29.90 |
| 2026-04-05 00:00 |
06:49:30.62 |
+50:03:53.7 |
HIP 33000 |
29.78 |
| 2026-04-05 12:00 |
06:49:30.82 |
+50:03:32.6 |
HIP 33000 |
29.66 |
| 2026-04-06 00:00 |
06:49:31.06 |
+50:03:11.5 |
HIP 33000 |
29.54 |
| 2026-04-06 12:00 |
06:49:31.34 |
+50:02:50.5 |
HIP 33000 |
29.42 |
| 2026-04-07 00:00 |
06:49:31.65 |
+50:02:29.4 |
HIP 33000 |
29.29 |
| 2026-04-07 12:00 |
06:49:32.00 |
+50:02:08.3 |
HIP 33000 |
29.17 |
| 2026-04-08 00:00 |
06:49:32.38 |
+50:01:47.2 |
HIP 33000 |
29.04 |
| 2026-04-08 12:00 |
06:49:32.80 |
+50:01:26.1 |
HIP 33000 |
28.91 |
| 2026-04-09 00:00 |
06:49:33.25 |
+50:01:05.0 |
HIP 33000 |
28.77 |
| 2026-04-09 12:00 |
06:49:33.74 |
+50:00:43.9 |
HIP 33000 |
28.64 |
| 2026-04-10 00:00 |
06:49:34.27 |
+50:00:22.8 |
HIP 33000 |
28.50 |
| 2026-04-10 12:00 |
06:49:34.83 |
+50:00:01.8 |
HIP 33000 |
28.36 |
| 2026-04-11 00:00 |
06:49:35.42 |
+49:59:40.7 |
HIP 33000 |
28.23 |
| 2026-04-11 12:00 |
06:49:36.06 |
+49:59:19.6 |
HIP 33000 |
28.08 |
| 2026-04-12 00:00 |
06:49:36.72 |
+49:58:58.6 |
HIP 33000 |
27.94 |
| 2026-04-12 12:00 |
06:49:37.42 |
+49:58:37.5 |
HIP 33000 |
27.80 |
| 2026-04-13 00:00 |
06:49:38.16 |
+49:58:16.5 |
HIP 33000 |
27.65 |
| 2026-04-13 12:00 |
06:49:38.93 |
+49:57:55.5 |
HIP 33000 |
27.50 |
| 2026-04-14 00:00 |
06:49:39.73 |
+49:57:34.5 |
HIP 33000 |
27.36 |
| 2026-04-14 12:00 |
06:49:40.57 |
+49:57:13.5 |
HIP 33000 |
27.21 |
| 2026-04-15 00:00 |
06:49:41.45 |
+49:56:52.5 |
HIP 33000 |
27.06 |
| 2026-04-15 12:00 |
06:49:42.36 |
+49:56:31.6 |
HIP 33000 |
26.90 |
| 2026-04-16 00:00 |
06:49:43.30 |
+49:56:10.6 |
HIP 33000 |
26.75 |