メタデータ
| 項目 |
値 |
| Designation |
47P/Ashbrook-Jackson |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-10-26T15:38:40.142400Z |
| Orbit solution date (soln_date, UTC) |
2026-04-14T14:49:55Z |
| Obs used |
2384 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
4.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-11-29.0000000 |
| e |
0.31853138 |
| q (au) |
2.810020 |
| a (au) |
4.123477 |
| i (deg) |
13.040596 |
| Ω (om, deg) |
356.920741 |
| ω (w, deg) |
357.658335 |
| M (ma, deg) |
191.952899 |
等級
散乱 + 全体線形
$$
M_a = (7.992 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.992 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.741 |
| k |
0.992 |
| 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) |
| 2026-07-29 00:00 |
04:26:06.81 |
+31:28:42.7 |
HIP 20704 |
2.36 |
| 2026-07-29 12:00 |
04:26:46.58 |
+31:31:37.9 |
HIP 20704 |
10.09 |
| 2026-07-30 00:00 |
04:27:26.22 |
+31:34:32.7 |
HIP 20704 |
18.91 |
| 2026-07-30 12:00 |
04:28:05.75 |
+31:37:26.9 |
HIP 20704 |
27.78 |
| 2026-07-31 00:00 |
04:28:45.16 |
+31:40:20.7 |
HIP 20710 |
35.81 |
| 2026-07-31 12:00 |
04:29:24.44 |
+31:43:14.0 |
HIP 21105 |
36.67 |
| 2026-08-01 00:00 |
04:30:03.61 |
+31:46:06.8 |
HIP 21105 |
33.95 |
| 2026-08-01 12:00 |
04:30:42.65 |
+31:48:59.2 |
HIP 21105 |
33.42 |
| 2026-08-02 00:00 |
04:31:21.56 |
+31:51:51.0 |
HIP 21196 |
32.31 |
| 2026-08-02 12:00 |
04:32:00.35 |
+31:54:42.4 |
HIP 21196 |
31.60 |
| 2026-08-03 00:00 |
04:32:39.01 |
+31:57:33.4 |
HIP 21196 |
33.26 |
| 2026-08-03 12:00 |
04:33:17.54 |
+32:00:23.9 |
HIP 21196 |
36.93 |
| 2026-08-04 00:00 |
04:33:55.94 |
+32:03:13.9 |
HIP 21397 |
37.92 |
| 2026-08-04 12:00 |
04:34:34.20 |
+32:06:03.5 |
HIP 21397 |
31.51 |
| 2026-08-05 00:00 |
04:35:12.34 |
+32:08:52.7 |
HIP 21397 |
26.37 |
| 2026-08-05 12:00 |
04:35:50.34 |
+32:11:41.4 |
HIP 21397 |
23.31 |
| 2026-08-06 00:00 |
04:36:28.20 |
+32:14:29.7 |
HIP 21397 |
23.15 |
| 2026-08-06 12:00 |
04:37:05.92 |
+32:17:17.6 |
HIP 21602 |
22.73 |
| 2026-08-07 00:00 |
04:37:43.50 |
+32:20:05.1 |
HIP 21602 |
21.24 |
| 2026-08-07 12:00 |
04:38:20.94 |
+32:22:52.1 |
HIP 21602 |
22.97 |
| 2026-08-08 00:00 |
04:38:58.24 |
+32:25:38.8 |
HIP 21726 |
26.92 |
| 2026-08-08 12:00 |
04:39:35.39 |
+32:28:25.0 |
HIP 21726 |
27.27 |
| 2026-08-09 00:00 |
04:40:12.40 |
+32:31:10.8 |
HIP 21726 |
30.01 |
| 2026-08-09 12:00 |
04:40:49.26 |
+32:33:56.3 |
HIP 21726 |
34.56 |
| 2026-08-10 00:00 |
04:41:25.96 |
+32:36:41.3 |
HIP 22003 |
33.59 |
| 2026-08-10 12:00 |
04:42:02.52 |
+32:39:26.0 |
HIP 22003 |
25.51 |
| 2026-08-11 00:00 |
04:42:38.92 |
+32:42:10.2 |
HIP 22003 |
17.54 |
| 2026-08-11 12:00 |
04:43:15.16 |
+32:44:54.1 |
HIP 22003 |
9.89 |
| 2026-08-12 00:00 |
04:43:51.25 |
+32:47:37.7 |
HIP 22003 |
4.35 |
| 2026-08-12 12:00 |
04:44:27.18 |
+32:50:20.8 |
HIP 22003 |
8.32 |
| 2026-08-13 00:00 |
04:45:02.95 |
+32:53:03.6 |
HIP 22003 |
15.72 |
| 2026-08-13 12:00 |
04:45:38.55 |
+32:55:46.1 |
HIP 22217 |
21.99 |
| 2026-08-14 00:00 |
04:46:13.99 |
+32:58:28.2 |
HIP 22217 |
21.25 |
| 2026-08-14 12:00 |
04:46:49.27 |
+33:01:09.9 |
HIP 22217 |
23.34 |
| 2026-08-15 00:00 |
04:47:24.38 |
+33:03:51.4 |
HIP 22217 |
27.60 |
| 2026-08-15 12:00 |
04:47:59.32 |
+33:06:32.4 |
HIP 22217 |
33.16 |
| 2026-08-16 00:00 |
04:48:34.09 |
+33:09:13.2 |
HIP 22407 |
35.21 |
| 2026-08-16 12:00 |
04:49:08.68 |
+33:11:53.6 |
HIP 22559 |
32.59 |
| 2026-08-17 00:00 |
04:49:43.11 |
+33:14:33.7 |
HIP 22559 |
28.85 |
| 2026-08-17 12:00 |
04:50:17.36 |
+33:17:13.5 |
HIP 22559 |
26.87 |
| 2026-08-18 00:00 |
04:50:51.43 |
+33:19:52.9 |
HIP 22612 |
22.77 |
| 2026-08-18 12:00 |
04:51:25.32 |
+33:22:32.1 |
HIP 22612 |
17.06 |
| 2026-08-19 00:00 |
04:51:59.04 |
+33:25:11.0 |
HIP 22612 |
13.32 |