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
$$
M_a = (15.142 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.142 |
| n |
6.000 |
| gf |
0.994 |
| gb |
-1.000 |
| k |
0.882 |
| δ90 |
4.709 |
| 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) |
| 2026-06-01 00:00 |
07:51:06.68 |
+21:20:35.6 |
HIP 38390 |
21.24 |
| 2026-06-01 12:00 |
07:51:28.41 |
+21:19:45.7 |
HIP 38390 |
20.14 |
| 2026-06-02 00:00 |
07:51:50.23 |
+21:18:55.5 |
HIP 38390 |
20.31 |
| 2026-06-02 12:00 |
07:52:12.14 |
+21:18:04.8 |
HIP 38390 |
21.75 |
| 2026-06-03 00:00 |
07:52:34.14 |
+21:17:13.7 |
HIP 38390 |
24.24 |
| 2026-06-03 12:00 |
07:52:56.23 |
+21:16:22.1 |
HIP 38601 |
20.59 |
| 2026-06-04 00:00 |
07:53:18.41 |
+21:15:30.2 |
HIP 38601 |
15.75 |
| 2026-06-04 12:00 |
07:53:40.68 |
+21:14:37.8 |
HIP 38601 |
11.27 |
| 2026-06-05 00:00 |
07:54:03.03 |
+21:13:45.0 |
HIP 38601 |
7.81 |
| 2026-06-05 12:00 |
07:54:25.47 |
+21:12:51.7 |
HIP 38601 |
7.13 |
| 2026-06-06 00:00 |
07:54:48.00 |
+21:11:58.0 |
HIP 38601 |
9.87 |
| 2026-06-06 12:00 |
07:55:10.61 |
+21:11:03.9 |
HIP 38601 |
14.18 |
| 2026-06-07 00:00 |
07:55:33.30 |
+21:10:09.4 |
HIP 38601 |
19.04 |
| 2026-06-07 12:00 |
07:55:56.07 |
+21:09:14.4 |
HIP 38856 |
19.76 |
| 2026-06-08 00:00 |
07:56:18.93 |
+21:08:19.1 |
HIP 38856 |
15.02 |
| 2026-06-08 12:00 |
07:56:41.87 |
+21:07:23.2 |
HIP 38856 |
10.90 |
| 2026-06-09 00:00 |
07:57:04.89 |
+21:06:27.0 |
HIP 38856 |
8.44 |
| 2026-06-09 12:00 |
07:57:27.99 |
+21:05:30.3 |
HIP 38856 |
9.11 |
| 2026-06-10 00:00 |
07:57:51.17 |
+21:04:33.3 |
HIP 38856 |
12.45 |
| 2026-06-10 12:00 |
07:58:14.43 |
+21:03:35.7 |
HIP 39002 |
10.88 |
| 2026-06-11 00:00 |
07:58:37.76 |
+21:02:37.8 |
HIP 39002 |
7.65 |
| 2026-06-11 12:00 |
07:59:01.17 |
+21:01:39.4 |
HIP 39002 |
7.73 |
| 2026-06-12 00:00 |
07:59:24.66 |
+21:00:40.6 |
HIP 39064 |
10.19 |
| 2026-06-12 12:00 |
07:59:48.22 |
+20:59:41.4 |
HIP 39064 |
9.59 |
| 2026-06-13 00:00 |
08:00:11.85 |
+20:58:41.8 |
HIP 39064 |
11.94 |
| 2026-06-13 12:00 |
08:00:35.56 |
+20:57:41.7 |
HIP 39064 |
16.02 |
| 2026-06-14 00:00 |
08:00:59.34 |
+20:56:41.2 |
HIP 39064 |
20.85 |
| 2026-06-14 12:00 |
08:01:23.20 |
+20:55:40.3 |
HIP 39064 |
26.02 |
| 2026-06-15 00:00 |
08:01:47.12 |
+20:54:39.0 |
HIP 39260 |
27.84 |
| 2026-06-15 12:00 |
08:02:11.11 |
+20:53:37.2 |
HIP 39260 |
27.62 |
| 2026-06-16 00:00 |
08:02:35.17 |
+20:52:35.0 |
HIP 39503 |
27.52 |
| 2026-06-16 12:00 |
08:02:59.30 |
+20:51:32.4 |
HIP 39503 |
22.58 |
| 2026-06-17 00:00 |
08:03:23.50 |
+20:50:29.4 |
HIP 39503 |
18.09 |
| 2026-06-17 12:00 |
08:03:47.76 |
+20:49:26.0 |
HIP 39503 |
14.52 |
| 2026-06-18 00:00 |
08:04:12.09 |
+20:48:22.2 |
HIP 39503 |
12.68 |
| 2026-06-18 12:00 |
08:04:36.48 |
+20:47:17.9 |
HIP 39503 |
13.33 |
| 2026-06-19 00:00 |
08:05:00.93 |
+20:46:13.3 |
HIP 39624 |
11.46 |
| 2026-06-19 12:00 |
08:05:25.45 |
+20:45:08.2 |
HIP 39624 |
6.35 |
| 2026-06-20 00:00 |
08:05:50.03 |
+20:44:02.7 |
HIP 39624 |
4.18 |
| 2026-06-20 12:00 |
08:06:14.66 |
+20:42:56.9 |
HIP 39624 |
7.95 |
| 2026-06-21 00:00 |
08:06:39.36 |
+20:41:50.6 |
HIP 39711 |
12.75 |
| 2026-06-21 12:00 |
08:07:04.12 |
+20:40:43.9 |
HIP 39711 |
12.78 |
| 2026-06-22 00:00 |
08:07:28.93 |
+20:39:36.8 |
HIP 39711 |
15.30 |