メタデータ
| 項目 |
値 |
| Designation |
76P/West-Kohoutek-Ikemura |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-05-07T18:47:29.057280Z |
| Orbit solution date (soln_date, UTC) |
2026-04-14T23:00:03Z |
| Obs used |
960 |
| NEO |
- |
| M1 |
16.400 |
| K1 |
7.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-11-15.0000000 |
| e |
0.53889156 |
| q (au) |
1.600205 |
| a (au) |
3.470343 |
| i (deg) |
30.483072 |
| Ω (om, deg) |
84.124325 |
| ω (w, deg) |
0.071457 |
| M (ma, deg) |
333.505690 |
等級
散乱 + 全体線形
$$
M_a = (12.774 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.774 |
| n |
6.000 |
| gf |
0.999 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
05:17:36.70 |
+28:49:51.5 |
HIP 24642 |
6.43 |
| 2026-05-12 12:00 |
05:19:07.69 |
+28:56:53.0 |
HIP 24735 |
15.25 |
| 2026-05-13 00:00 |
05:20:38.86 |
+29:03:50.3 |
HIP 25158 |
30.94 |
| 2026-05-13 12:00 |
05:22:10.21 |
+29:10:43.4 |
HIP 25158 |
12.14 |
| 2026-05-14 00:00 |
05:23:41.73 |
+29:17:32.3 |
HIP 25158 |
15.09 |
| 2026-05-14 12:00 |
05:25:13.43 |
+29:24:16.9 |
HIP 25158 |
34.61 |
| 2026-05-15 00:00 |
05:26:45.29 |
+29:30:57.3 |
HIP 25500 |
24.90 |
| 2026-05-15 12:00 |
05:28:17.32 |
+29:37:33.4 |
HIP 25500 |
22.93 |
| 2026-05-16 00:00 |
05:29:49.52 |
+29:44:05.3 |
HIP 25763 |
11.49 |
| 2026-05-16 12:00 |
05:31:21.89 |
+29:50:32.8 |
HIP 25763 |
23.95 |
| 2026-05-17 00:00 |
05:32:54.42 |
+29:56:56.1 |
HIP 26208 |
33.58 |
| 2026-05-17 12:00 |
05:34:27.10 |
+30:03:15.0 |
HIP 26208 |
13.82 |
| 2026-05-18 00:00 |
05:35:59.95 |
+30:09:29.6 |
HIP 26208 |
11.80 |
| 2026-05-18 12:00 |
05:37:32.95 |
+30:15:39.9 |
HIP 26550 |
15.69 |
| 2026-05-19 00:00 |
05:39:06.11 |
+30:21:45.8 |
HIP 26550 |
9.50 |
| 2026-05-19 12:00 |
05:40:39.41 |
+30:27:47.3 |
HIP 26854 |
20.89 |
| 2026-05-20 00:00 |
05:42:12.87 |
+30:33:44.5 |
HIP 26854 |
15.86 |
| 2026-05-20 12:00 |
05:43:46.47 |
+30:39:37.3 |
HIP 27077 |
14.08 |
| 2026-05-21 00:00 |
05:45:20.22 |
+30:45:25.7 |
HIP 27040 |
19.29 |
| 2026-05-21 12:00 |
05:46:54.10 |
+30:51:09.7 |
HIP 27398 |
20.74 |
| 2026-05-22 00:00 |
05:48:28.13 |
+30:56:49.3 |
HIP 27398 |
19.43 |
| 2026-05-22 12:00 |
05:50:02.29 |
+31:02:24.5 |
HIP 27582 |
5.89 |
| 2026-05-23 00:00 |
05:51:36.58 |
+31:07:55.2 |
HIP 27582 |
15.04 |
| 2026-05-23 12:00 |
05:53:11.01 |
+31:13:21.5 |
HIP 27582 |
35.96 |
| 2026-05-24 00:00 |
05:54:45.56 |
+31:18:43.4 |
HIP 27973 |
23.57 |
| 2026-05-24 12:00 |
05:56:20.25 |
+31:24:00.8 |
HIP 27973 |
25.04 |
| 2026-05-25 00:00 |
05:57:55.05 |
+31:29:13.7 |
HIP 28324 |
31.01 |
| 2026-05-25 12:00 |
05:59:29.98 |
+31:34:22.2 |
HIP 28445 |
13.88 |
| 2026-05-26 00:00 |
06:01:05.02 |
+31:39:26.1 |
HIP 28445 |
16.47 |
| 2026-05-26 12:00 |
06:02:40.19 |
+31:44:25.6 |
HIP 28683 |
22.81 |
| 2026-05-27 00:00 |
06:04:15.46 |
+31:49:20.7 |
HIP 28890 |
23.15 |
| 2026-05-27 12:00 |
06:05:50.85 |
+31:54:11.2 |
HIP 28890 |
3.27 |
| 2026-05-28 00:00 |
06:07:26.35 |
+31:58:57.2 |
HIP 28919 |
15.00 |
| 2026-05-28 12:00 |
06:09:01.95 |
+32:03:38.7 |
HIP 29173 |
19.77 |
| 2026-05-29 00:00 |
06:10:37.66 |
+32:08:15.7 |
HIP 29302 |
5.37 |
| 2026-05-29 12:00 |
06:12:13.47 |
+32:12:48.2 |
HIP 29302 |
22.24 |
| 2026-05-30 00:00 |
06:13:49.38 |
+32:17:16.2 |
HIP 29615 |
13.69 |
| 2026-05-30 12:00 |
06:15:25.38 |
+32:21:39.6 |
HIP 29615 |
13.98 |
| 2026-05-31 00:00 |
06:17:01.48 |
+32:25:58.6 |
HIP 29911 |
11.40 |
| 2026-05-31 12:00 |
06:18:37.67 |
+32:30:13.0 |
HIP 29911 |
9.73 |
| 2026-06-01 00:00 |
06:20:13.95 |
+32:34:22.8 |
HIP 30222 |
18.83 |
| 2026-06-01 12:00 |
06:21:50.32 |
+32:38:28.1 |
HIP 30316 |
11.81 |
| 2026-06-02 00:00 |
06:23:26.76 |
+32:42:28.9 |
HIP 30316 |
11.33 |