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) |
| 2026-05-12 00:00 |
07:38:03.33 |
+21:47:55.1 |
HIP 37214 |
11.57 |
| 2026-05-12 12:00 |
07:38:20.61 |
+21:47:22.6 |
HIP 37214 |
8.62 |
| 2026-05-13 00:00 |
07:38:38.01 |
+21:46:49.7 |
HIP 37214 |
6.88 |
| 2026-05-13 12:00 |
07:38:55.54 |
+21:46:16.3 |
HIP 37214 |
7.33 |
| 2026-05-14 00:00 |
07:39:13.21 |
+21:45:42.5 |
HIP 37214 |
9.72 |
| 2026-05-14 12:00 |
07:39:31.00 |
+21:45:08.3 |
HIP 37214 |
13.04 |
| 2026-05-15 00:00 |
07:39:48.92 |
+21:44:33.6 |
HIP 37214 |
16.77 |
| 2026-05-15 12:00 |
07:40:06.97 |
+21:43:58.5 |
HIP 37214 |
20.71 |
| 2026-05-16 00:00 |
07:40:25.14 |
+21:43:22.9 |
HIP 37442 |
19.91 |
| 2026-05-16 12:00 |
07:40:43.44 |
+21:42:46.9 |
HIP 37442 |
17.35 |
| 2026-05-17 00:00 |
07:41:01.87 |
+21:42:10.5 |
HIP 37442 |
15.56 |
| 2026-05-17 12:00 |
07:41:20.41 |
+21:41:33.6 |
HIP 37442 |
14.85 |
| 2026-05-18 00:00 |
07:41:39.08 |
+21:40:56.3 |
HIP 37442 |
15.39 |
| 2026-05-18 12:00 |
07:41:57.87 |
+21:40:18.6 |
HIP 37442 |
17.10 |
| 2026-05-19 00:00 |
07:42:16.77 |
+21:39:40.4 |
HIP 37442 |
19.68 |
| 2026-05-19 12:00 |
07:42:35.80 |
+21:39:01.8 |
HIP 37442 |
22.86 |
| 2026-05-20 00:00 |
07:42:54.94 |
+21:38:22.7 |
HIP 37442 |
26.44 |
| 2026-05-20 12:00 |
07:43:14.20 |
+21:37:43.2 |
HIP 37783 |
25.18 |
| 2026-05-21 00:00 |
07:43:33.57 |
+21:37:03.3 |
HIP 37783 |
21.76 |
| 2026-05-21 12:00 |
07:43:53.06 |
+21:36:22.9 |
HIP 37783 |
18.82 |
| 2026-05-22 00:00 |
07:44:12.66 |
+21:35:42.1 |
HIP 37783 |
16.63 |
| 2026-05-22 12:00 |
07:44:32.37 |
+21:35:00.9 |
HIP 37783 |
15.53 |
| 2026-05-23 00:00 |
07:44:52.19 |
+21:34:19.2 |
HIP 37783 |
15.78 |
| 2026-05-23 12:00 |
07:45:12.12 |
+21:33:37.1 |
HIP 37783 |
17.34 |
| 2026-05-24 00:00 |
07:45:32.16 |
+21:32:54.6 |
HIP 37783 |
19.93 |
| 2026-05-24 12:00 |
07:45:52.30 |
+21:32:11.6 |
HIP 37783 |
23.21 |
| 2026-05-25 00:00 |
07:46:12.55 |
+21:31:28.2 |
HIP 38042 |
22.75 |
| 2026-05-25 12:00 |
07:46:32.91 |
+21:30:44.4 |
HIP 38042 |
17.97 |
| 2026-05-26 00:00 |
07:46:53.37 |
+21:30:00.1 |
HIP 38042 |
13.18 |
| 2026-05-26 12:00 |
07:47:13.93 |
+21:29:15.4 |
HIP 38042 |
8.39 |
| 2026-05-27 00:00 |
07:47:34.60 |
+21:28:30.3 |
HIP 38042 |
3.71 |
| 2026-05-27 12:00 |
07:47:55.37 |
+21:27:44.8 |
HIP 38042 |
2.13 |
| 2026-05-28 00:00 |
07:48:16.23 |
+21:26:58.8 |
HIP 38042 |
6.59 |
| 2026-05-28 12:00 |
07:48:37.20 |
+21:26:12.4 |
HIP 38042 |
11.46 |
| 2026-05-29 00:00 |
07:48:58.27 |
+21:25:25.5 |
HIP 38042 |
16.39 |
| 2026-05-29 12:00 |
07:49:19.43 |
+21:24:38.3 |
HIP 38042 |
21.37 |
| 2026-05-30 00:00 |
07:49:40.69 |
+21:23:50.6 |
HIP 38042 |
26.37 |
| 2026-05-30 12:00 |
07:50:02.04 |
+21:23:02.5 |
HIP 38390 |
29.97 |
| 2026-05-31 00:00 |
07:50:23.49 |
+21:22:13.9 |
HIP 38390 |
26.42 |
| 2026-05-31 12:00 |
07:50:45.04 |
+21:21:25.0 |
HIP 38390 |
23.43 |
| 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 |