メタデータ
| 項目 |
値 |
| Designation |
22P/Kopff |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-03-17T21:18:35.899200Z |
| Orbit solution date (soln_date, UTC) |
2026-01-08T08:23:21Z |
| Obs used |
2690 |
| NEO |
- |
| M1 |
11.900 |
| K1 |
9.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-03-03.0000000 |
| e |
0.54862257 |
| q (au) |
1.554732 |
| a (au) |
3.444417 |
| i (deg) |
4.739898 |
| Ω (om, deg) |
120.835441 |
| ω (w, deg) |
162.912936 |
| M (ma, deg) |
188.722339 |
等級
散乱 + 全体線形
$$
M_a = (15.098 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.098 |
| n |
6.000 |
| gf |
0.984 |
| gb |
-1.000 |
| k |
0.888 |
| δ90 |
5.103 |
| 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 |
07:23:14.86 |
+22:06:15.1 |
HIP 35807 |
8.26 |
| 2026-03-26 12:00 |
07:23:15.20 |
+22:06:24.3 |
HIP 35807 |
8.43 |
| 2026-03-27 00:00 |
07:23:15.77 |
+22:06:32.9 |
HIP 35807 |
8.60 |
| 2026-03-27 12:00 |
07:23:16.56 |
+22:06:41.1 |
HIP 35807 |
8.78 |
| 2026-03-28 00:00 |
07:23:17.57 |
+22:06:48.8 |
HIP 35807 |
8.97 |
| 2026-03-28 12:00 |
07:23:18.81 |
+22:06:56.0 |
HIP 35807 |
9.17 |
| 2026-03-29 00:00 |
07:23:20.26 |
+22:07:02.8 |
HIP 35807 |
9.39 |
| 2026-03-29 12:00 |
07:23:21.93 |
+22:07:09.1 |
HIP 35807 |
9.63 |
| 2026-03-30 00:00 |
07:23:23.81 |
+22:07:15.0 |
HIP 35807 |
9.89 |
| 2026-03-30 12:00 |
07:23:25.92 |
+22:07:20.4 |
HIP 35807 |
10.18 |
| 2026-03-31 00:00 |
07:23:28.23 |
+22:07:25.3 |
HIP 35807 |
10.51 |
| 2026-03-31 12:00 |
07:23:30.77 |
+22:07:29.8 |
HIP 35807 |
10.87 |
| 2026-04-01 00:00 |
07:23:33.52 |
+22:07:33.8 |
HIP 35807 |
11.27 |
| 2026-04-01 12:00 |
07:23:36.48 |
+22:07:37.4 |
HIP 35807 |
11.72 |
| 2026-04-02 00:00 |
07:23:39.66 |
+22:07:40.5 |
HIP 35807 |
12.21 |
| 2026-04-02 12:00 |
07:23:43.04 |
+22:07:43.1 |
HIP 35807 |
12.76 |
| 2026-04-03 00:00 |
07:23:46.64 |
+22:07:45.3 |
HIP 35807 |
13.36 |
| 2026-04-03 12:00 |
07:23:50.45 |
+22:07:47.1 |
HIP 35807 |
14.01 |
| 2026-04-04 00:00 |
07:23:54.47 |
+22:07:48.4 |
HIP 35807 |
14.72 |
| 2026-04-04 12:00 |
07:23:58.70 |
+22:07:49.2 |
HIP 35807 |
15.49 |
| 2026-04-05 00:00 |
07:24:03.14 |
+22:07:49.7 |
HIP 35807 |
16.31 |
| 2026-04-05 12:00 |
07:24:07.78 |
+22:07:49.6 |
HIP 35807 |
17.19 |
| 2026-04-06 00:00 |
07:24:12.63 |
+22:07:49.1 |
HIP 35807 |
18.13 |
| 2026-04-06 12:00 |
07:24:17.69 |
+22:07:48.2 |
HIP 35807 |
19.13 |
| 2026-04-07 00:00 |
07:24:22.95 |
+22:07:46.8 |
HIP 35807 |
20.18 |
| 2026-04-07 12:00 |
07:24:28.41 |
+22:07:45.0 |
HIP 35807 |
21.29 |
| 2026-04-08 00:00 |
07:24:34.08 |
+22:07:42.7 |
HIP 35807 |
22.46 |
| 2026-04-08 12:00 |
07:24:39.95 |
+22:07:39.9 |
HIP 35807 |
23.68 |
| 2026-04-09 00:00 |
07:24:46.03 |
+22:07:36.8 |
HIP 36086 |
23.41 |
| 2026-04-09 12:00 |
07:24:52.30 |
+22:07:33.2 |
HIP 36086 |
22.23 |
| 2026-04-10 00:00 |
07:24:58.78 |
+22:07:29.1 |
HIP 36086 |
21.04 |
| 2026-04-10 12:00 |
07:25:05.45 |
+22:07:24.6 |
HIP 36086 |
19.86 |
| 2026-04-11 00:00 |
07:25:12.32 |
+22:07:19.6 |
HIP 36086 |
18.70 |
| 2026-04-11 12:00 |
07:25:19.39 |
+22:07:14.3 |
HIP 36086 |
17.57 |
| 2026-04-12 00:00 |
07:25:26.66 |
+22:07:08.4 |
HIP 36086 |
16.50 |
| 2026-04-12 12:00 |
07:25:34.12 |
+22:07:02.1 |
HIP 36086 |
15.50 |
| 2026-04-13 00:00 |
07:25:41.78 |
+22:06:55.4 |
HIP 36086 |
14.62 |
| 2026-04-13 12:00 |
07:25:49.63 |
+22:06:48.3 |
HIP 36086 |
13.90 |
| 2026-04-14 00:00 |
07:25:57.68 |
+22:06:40.6 |
HIP 36086 |
13.36 |
| 2026-04-14 12:00 |
07:26:05.91 |
+22:06:32.6 |
HIP 36086 |
13.07 |
| 2026-04-15 00:00 |
07:26:14.34 |
+22:06:24.1 |
HIP 36086 |
13.06 |
| 2026-04-15 12:00 |
07:26:22.96 |
+22:06:15.2 |
HIP 36086 |
13.34 |
| 2026-04-16 00:00 |
07:26:31.77 |
+22:06:05.8 |
HIP 36215 |
13.65 |