メタデータ
| 項目 |
値 |
| Designation |
2P/Encke |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-10-22T03:35:18.398400Z |
| Orbit solution date (soln_date, UTC) |
2025-12-15T09:34:26Z |
| Obs used |
640 |
| NEO |
Yes |
| M1 |
15.600 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-09-25.0000000 |
| e |
0.84774970 |
| q (au) |
0.337948 |
| a (au) |
2.219689 |
| i (deg) |
11.412278 |
| Ω (om, deg) |
334.193585 |
| ω (w, deg) |
187.134246 |
| M (ma, deg) |
243.126069 |
等級
散乱 + 全体線形
$$
M_a = (13.799 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.799 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
23:46:05.02 |
+02:03:45.7 |
HIP 117156 |
15.27 |
| 2026-03-26 12:00 |
23:46:34.52 |
+02:07:16.2 |
HIP 117156 |
22.61 |
| 2026-03-27 00:00 |
23:47:04.03 |
+02:10:46.9 |
HIP 117445 |
26.39 |
| 2026-03-27 12:00 |
23:47:33.56 |
+02:14:17.9 |
HIP 117445 |
18.99 |
| 2026-03-28 00:00 |
23:48:03.10 |
+02:17:49.2 |
HIP 117445 |
12.57 |
| 2026-03-28 12:00 |
23:48:32.65 |
+02:21:20.7 |
HIP 117445 |
9.45 |
| 2026-03-29 00:00 |
23:49:02.20 |
+02:24:52.5 |
HIP 117473 |
2.52 |
| 2026-03-29 12:00 |
23:49:31.77 |
+02:28:24.5 |
HIP 117473 |
6.49 |
| 2026-03-30 00:00 |
23:50:01.35 |
+02:31:56.8 |
HIP 117473 |
14.56 |
| 2026-03-30 12:00 |
23:50:30.94 |
+02:35:29.3 |
HIP 117526 |
18.26 |
| 2026-03-31 00:00 |
23:51:00.53 |
+02:39:02.0 |
HIP 117526 |
19.32 |
| 2026-03-31 12:00 |
23:51:30.14 |
+02:42:35.0 |
HIP 117683 |
14.94 |
| 2026-04-01 00:00 |
23:51:59.75 |
+02:46:08.2 |
HIP 117683 |
9.70 |
| 2026-04-01 12:00 |
23:52:29.37 |
+02:49:41.7 |
HIP 117683 |
9.98 |
| 2026-04-02 00:00 |
23:52:59.00 |
+02:53:15.4 |
HIP 117818 |
13.93 |
| 2026-04-02 12:00 |
23:53:28.64 |
+02:56:49.3 |
HIP 117818 |
13.27 |
| 2026-04-03 00:00 |
23:53:58.28 |
+03:00:23.4 |
HIP 117818 |
17.12 |
| 2026-04-03 12:00 |
23:54:27.93 |
+03:03:57.7 |
HIP 117933 |
16.89 |
| 2026-04-04 00:00 |
23:54:57.59 |
+03:07:32.3 |
HIP 117933 |
9.03 |
| 2026-04-04 12:00 |
23:55:27.25 |
+03:11:07.1 |
HIP 117933 |
3.60 |
| 2026-04-05 00:00 |
23:55:56.91 |
+03:14:42.1 |
HIP 117933 |
8.93 |
| 2026-04-05 12:00 |
23:56:26.59 |
+03:18:17.3 |
HIP 117933 |
16.79 |
| 2026-04-06 00:00 |
23:56:56.26 |
+03:21:52.7 |
HIP 118104 |
22.41 |
| 2026-04-06 12:00 |
23:57:25.94 |
+03:25:28.4 |
HIP 118185 |
16.85 |
| 2026-04-07 00:00 |
23:57:55.63 |
+03:29:04.2 |
HIP 118185 |
8.69 |
| 2026-04-07 12:00 |
23:58:25.32 |
+03:32:40.2 |
HIP 118185 |
1.63 |
| 2026-04-08 00:00 |
23:58:55.01 |
+03:36:16.5 |
HIP 118185 |
8.10 |
| 2026-04-08 12:00 |
23:59:24.71 |
+03:39:52.9 |
HIP 118185 |
16.26 |
| 2026-04-09 00:00 |
23:59:54.40 |
+03:43:29.5 |
HIP 6 |
13.53 |
| 2026-04-09 12:00 |
00:00:24.10 |
+03:47:06.3 |
HIP 6 |
10.86 |
| 2026-04-10 00:00 |
00:00:53.81 |
+03:50:43.3 |
HIP 6 |
13.75 |
| 2026-04-10 12:00 |
00:01:23.51 |
+03:54:20.5 |
HIP 6 |
19.89 |
| 2026-04-11 00:00 |
00:01:53.21 |
+03:57:57.8 |
HIP 224 |
14.86 |
| 2026-04-11 12:00 |
00:02:22.91 |
+04:01:35.4 |
HIP 224 |
11.65 |
| 2026-04-12 00:00 |
00:02:52.61 |
+04:05:13.1 |
HIP 224 |
13.66 |
| 2026-04-12 12:00 |
00:03:22.32 |
+04:08:50.9 |
HIP 294 |
15.10 |
| 2026-04-13 00:00 |
00:03:52.02 |
+04:12:29.0 |
HIP 294 |
18.30 |
| 2026-04-13 12:00 |
00:04:21.71 |
+04:16:07.2 |
HIP 294 |
24.05 |
| 2026-04-14 00:00 |
00:04:51.41 |
+04:19:45.5 |
HIP 294 |
30.95 |
| 2026-04-14 12:00 |
00:05:21.10 |
+04:23:24.0 |
HIP 263 |
35.26 |
| 2026-04-15 00:00 |
00:05:50.79 |
+04:27:02.7 |
HIP 263 |
40.40 |
| 2026-04-15 12:00 |
00:06:20.48 |
+04:30:41.5 |
HIP 658 |
36.21 |
| 2026-04-16 00:00 |
00:06:50.16 |
+04:34:20.5 |
HIP 658 |
28.44 |