メタデータ
| 項目 |
値 |
| Designation |
76P/West-Kohoutek-Ikemura |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-05-08T00:19:43.550400Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T15:27:08Z |
| Obs used |
1158 |
| NEO |
- |
| M1 |
15.700 |
| K1 |
9.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-03-30.0000000 |
| e |
0.53843850 |
| q (au) |
1.602035 |
| a (au) |
3.470903 |
| i (deg) |
30.475724 |
| Ω (om, deg) |
84.113051 |
| ω (w, deg) |
0.048279 |
| M (ma, deg) |
242.634938 |
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) |
| 2026-03-26 00:00 |
03:10:11.65 |
+13:22:40.2 |
HIP 14711 |
22.91 |
| 2026-03-26 12:00 |
03:11:23.13 |
+13:34:47.4 |
HIP 14694 |
25.12 |
| 2026-03-27 00:00 |
03:12:34.81 |
+13:46:52.3 |
HIP 14897 |
16.22 |
| 2026-03-27 12:00 |
03:13:46.70 |
+13:58:55.0 |
HIP 14897 |
22.47 |
| 2026-03-28 00:00 |
03:14:58.80 |
+14:10:55.5 |
HIP 15153 |
8.72 |
| 2026-03-28 12:00 |
03:16:11.11 |
+14:22:53.6 |
HIP 15153 |
13.53 |
| 2026-03-29 00:00 |
03:17:23.62 |
+14:34:49.5 |
HIP 15153 |
34.51 |
| 2026-03-29 12:00 |
03:18:36.34 |
+14:46:43.0 |
HIP 15536 |
22.47 |
| 2026-03-30 00:00 |
03:19:49.27 |
+14:58:34.1 |
HIP 15536 |
9.67 |
| 2026-03-30 12:00 |
03:21:02.41 |
+15:10:22.9 |
HIP 15536 |
24.16 |
| 2026-03-31 00:00 |
03:22:15.76 |
+15:22:09.3 |
HIP 15805 |
26.57 |
| 2026-03-31 12:00 |
03:23:29.32 |
+15:33:53.3 |
HIP 15805 |
6.47 |
| 2026-04-01 00:00 |
03:24:43.08 |
+15:45:34.8 |
HIP 15951 |
10.48 |
| 2026-04-01 12:00 |
03:25:57.06 |
+15:57:13.8 |
HIP 15951 |
11.14 |
| 2026-04-02 00:00 |
03:27:11.25 |
+16:08:50.4 |
HIP 16176 |
17.63 |
| 2026-04-02 12:00 |
03:28:25.65 |
+16:20:24.4 |
HIP 16241 |
15.48 |
| 2026-04-03 00:00 |
03:29:40.26 |
+16:31:55.9 |
HIP 16268 |
13.82 |
| 2026-04-03 12:00 |
03:30:55.08 |
+16:43:24.9 |
HIP 16469 |
17.03 |
| 2026-04-04 00:00 |
03:32:10.11 |
+16:54:51.2 |
HIP 16469 |
11.20 |
| 2026-04-04 12:00 |
03:33:25.36 |
+17:06:15.0 |
HIP 16598 |
13.89 |
| 2026-04-05 00:00 |
03:34:40.82 |
+17:17:36.1 |
HIP 16598 |
14.92 |
| 2026-04-05 12:00 |
03:35:56.50 |
+17:28:54.6 |
HIP 16706 |
19.48 |
| 2026-04-06 00:00 |
03:37:12.39 |
+17:40:10.5 |
HIP 16802 |
15.78 |
| 2026-04-06 12:00 |
03:38:28.49 |
+17:51:23.6 |
HIP 16983 |
15.45 |
| 2026-04-07 00:00 |
03:39:44.81 |
+18:02:34.0 |
HIP 17174 |
13.81 |
| 2026-04-07 12:00 |
03:41:01.35 |
+18:13:41.7 |
HIP 17174 |
9.04 |
| 2026-04-08 00:00 |
03:42:18.10 |
+18:24:46.6 |
HIP 17282 |
13.02 |
| 2026-04-08 12:00 |
03:43:35.07 |
+18:35:48.8 |
HIP 17421 |
18.67 |
| 2026-04-09 00:00 |
03:44:52.25 |
+18:46:48.1 |
HIP 17421 |
14.88 |
| 2026-04-09 12:00 |
03:46:09.66 |
+18:57:44.6 |
HIP 17586 |
23.83 |
| 2026-04-10 00:00 |
03:47:27.27 |
+19:08:38.3 |
HIP 17740 |
29.68 |
| 2026-04-10 12:00 |
03:48:45.11 |
+19:19:29.1 |
HIP 17920 |
21.93 |
| 2026-04-11 00:00 |
03:50:03.17 |
+19:30:16.9 |
HIP 17920 |
4.18 |
| 2026-04-11 12:00 |
03:51:21.44 |
+19:41:01.9 |
HIP 18091 |
10.63 |
| 2026-04-12 00:00 |
03:52:39.93 |
+19:51:43.9 |
HIP 18091 |
18.39 |
| 2026-04-12 12:00 |
03:53:58.64 |
+20:02:22.9 |
HIP 18165 |
16.77 |
| 2026-04-13 00:00 |
03:55:17.57 |
+20:12:59.0 |
HIP 18473 |
23.71 |
| 2026-04-13 12:00 |
03:56:36.72 |
+20:23:32.0 |
HIP 18473 |
18.89 |
| 2026-04-14 00:00 |
03:57:56.08 |
+20:34:02.0 |
HIP 18544 |
6.71 |
| 2026-04-14 12:00 |
03:59:15.67 |
+20:44:29.0 |
HIP 18544 |
17.73 |
| 2026-04-15 00:00 |
04:00:35.47 |
+20:54:52.8 |
HIP 18792 |
23.10 |
| 2026-04-15 12:00 |
04:01:55.50 |
+21:05:13.6 |
HIP 18976 |
28.60 |
| 2026-04-16 00:00 |
04:03:15.74 |
+21:15:31.2 |
HIP 18976 |
14.97 |