メタデータ
| 項目 |
値 |
| Designation |
199P/Shoemaker 4 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-04-08T02:25:25.942080Z |
| Orbit solution date (soln_date, UTC) |
2024-08-18T18:42:22Z |
| Obs used |
863 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
16.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-04-27.0000000 |
| e |
0.50752456 |
| q (au) |
2.929047 |
| a (au) |
5.947599 |
| i (deg) |
24.756182 |
| Ω (om, deg) |
92.622289 |
| ω (w, deg) |
191.826638 |
| M (ma, deg) |
50.887927 |
等級
散乱 + 全体線形
$$
M_a = (7.239 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.239 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.902 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
04:25:39.49 |
+07:43:01.4 |
HIP 20546 |
27.62 |
| 2026-07-29 12:00 |
04:25:52.47 |
+07:43:11.3 |
HIP 20546 |
30.37 |
| 2026-07-30 00:00 |
04:26:05.36 |
+07:43:20.7 |
HIP 20808 |
30.10 |
| 2026-07-30 12:00 |
04:26:18.14 |
+07:43:29.6 |
HIP 20808 |
28.04 |
| 2026-07-31 00:00 |
04:26:30.83 |
+07:43:37.8 |
HIP 20808 |
26.22 |
| 2026-07-31 12:00 |
04:26:43.42 |
+07:43:45.6 |
HIP 20808 |
24.68 |
| 2026-08-01 00:00 |
04:26:55.90 |
+07:43:52.7 |
HIP 20808 |
23.44 |
| 2026-08-01 12:00 |
04:27:08.28 |
+07:43:59.4 |
HIP 20808 |
22.57 |
| 2026-08-02 00:00 |
04:27:20.57 |
+07:44:05.5 |
HIP 20808 |
22.09 |
| 2026-08-02 12:00 |
04:27:32.74 |
+07:44:11.0 |
HIP 20808 |
22.01 |
| 2026-08-03 00:00 |
04:27:44.82 |
+07:44:16.0 |
HIP 20808 |
22.33 |
| 2026-08-03 12:00 |
04:27:56.79 |
+07:44:20.5 |
HIP 20808 |
23.02 |
| 2026-08-04 00:00 |
04:28:08.65 |
+07:44:24.4 |
HIP 20808 |
24.05 |
| 2026-08-04 12:00 |
04:28:20.41 |
+07:44:27.8 |
HIP 20852 |
25.10 |
| 2026-08-05 00:00 |
04:28:32.06 |
+07:44:30.7 |
HIP 20852 |
25.65 |
| 2026-08-05 12:00 |
04:28:43.61 |
+07:44:33.0 |
HIP 20852 |
26.49 |
| 2026-08-06 00:00 |
04:28:55.04 |
+07:44:34.8 |
HIP 20852 |
27.61 |
| 2026-08-06 12:00 |
04:29:06.37 |
+07:44:36.0 |
HIP 20852 |
28.95 |
| 2026-08-07 00:00 |
04:29:17.59 |
+07:44:36.7 |
HIP 20986 |
29.18 |
| 2026-08-07 12:00 |
04:29:28.69 |
+07:44:36.9 |
HIP 20986 |
28.23 |
| 2026-08-08 00:00 |
04:29:39.69 |
+07:44:36.6 |
HIP 21107 |
26.20 |
| 2026-08-08 12:00 |
04:29:50.57 |
+07:44:35.7 |
HIP 21107 |
23.55 |
| 2026-08-09 00:00 |
04:30:01.34 |
+07:44:34.3 |
HIP 21107 |
20.94 |
| 2026-08-09 12:00 |
04:30:12.00 |
+07:44:32.4 |
HIP 21107 |
18.37 |
| 2026-08-10 00:00 |
04:30:22.54 |
+07:44:30.0 |
HIP 21107 |
15.86 |
| 2026-08-10 12:00 |
04:30:32.97 |
+07:44:27.0 |
HIP 21107 |
13.41 |
| 2026-08-11 00:00 |
04:30:43.28 |
+07:44:23.6 |
HIP 21107 |
11.06 |
| 2026-08-11 12:00 |
04:30:53.47 |
+07:44:19.6 |
HIP 21107 |
8.85 |
| 2026-08-12 00:00 |
04:31:03.55 |
+07:44:15.1 |
HIP 21107 |
6.88 |
| 2026-08-12 12:00 |
04:31:13.51 |
+07:44:10.1 |
HIP 21107 |
5.40 |
| 2026-08-13 00:00 |
04:31:23.35 |
+07:44:04.6 |
HIP 21107 |
4.82 |
| 2026-08-13 12:00 |
04:31:33.06 |
+07:43:58.6 |
HIP 21107 |
5.40 |
| 2026-08-14 00:00 |
04:31:42.66 |
+07:43:52.1 |
HIP 21107 |
6.82 |
| 2026-08-14 12:00 |
04:31:52.14 |
+07:43:45.1 |
HIP 21107 |
8.65 |
| 2026-08-15 00:00 |
04:32:01.50 |
+07:43:37.6 |
HIP 21107 |
10.67 |
| 2026-08-15 12:00 |
04:32:10.73 |
+07:43:29.7 |
HIP 21107 |
12.76 |
| 2026-08-16 00:00 |
04:32:19.84 |
+07:43:21.2 |
HIP 21107 |
14.89 |
| 2026-08-16 12:00 |
04:32:28.83 |
+07:43:12.3 |
HIP 21107 |
17.03 |
| 2026-08-17 00:00 |
04:32:37.69 |
+07:43:02.8 |
HIP 21107 |
19.16 |
| 2026-08-17 12:00 |
04:32:46.43 |
+07:42:52.9 |
HIP 21107 |
21.27 |
| 2026-08-18 00:00 |
04:32:55.04 |
+07:42:42.5 |
HIP 21107 |
23.37 |
| 2026-08-18 12:00 |
04:33:03.53 |
+07:42:31.7 |
HIP 21107 |
25.45 |
| 2026-08-19 00:00 |
04:33:11.89 |
+07:42:20.4 |
HIP 21107 |
27.51 |