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) |
| 2026-05-12 00:00 |
03:39:00.28 |
+05:16:05.9 |
HIP 17155 |
23.46 |
| 2026-05-12 12:00 |
03:39:20.48 |
+05:17:48.3 |
HIP 17155 |
19.70 |
| 2026-05-13 00:00 |
03:39:40.69 |
+05:19:30.1 |
HIP 17155 |
16.78 |
| 2026-05-13 12:00 |
03:40:00.90 |
+05:21:11.4 |
HIP 17158 |
15.17 |
| 2026-05-14 00:00 |
03:40:21.11 |
+05:22:52.2 |
HIP 17158 |
15.22 |
| 2026-05-14 12:00 |
03:40:41.33 |
+05:24:32.3 |
HIP 17158 |
17.00 |
| 2026-05-15 00:00 |
03:41:01.55 |
+05:26:12.0 |
HIP 17158 |
20.06 |
| 2026-05-15 12:00 |
03:41:21.77 |
+05:27:51.0 |
HIP 17335 |
23.37 |
| 2026-05-16 00:00 |
03:41:41.98 |
+05:29:29.5 |
HIP 17335 |
18.45 |
| 2026-05-16 12:00 |
03:42:02.20 |
+05:31:07.4 |
HIP 17335 |
13.80 |
| 2026-05-17 00:00 |
03:42:22.42 |
+05:32:44.8 |
HIP 17335 |
9.82 |
| 2026-05-17 12:00 |
03:42:42.63 |
+05:34:21.6 |
HIP 17335 |
7.66 |
| 2026-05-18 00:00 |
03:43:02.84 |
+05:35:57.8 |
HIP 17335 |
8.76 |
| 2026-05-18 12:00 |
03:43:23.05 |
+05:37:33.4 |
HIP 17335 |
12.27 |
| 2026-05-19 00:00 |
03:43:43.25 |
+05:39:08.5 |
HIP 17335 |
16.74 |
| 2026-05-19 12:00 |
03:44:03.45 |
+05:40:42.9 |
HIP 17335 |
21.57 |
| 2026-05-20 00:00 |
03:44:23.64 |
+05:42:16.8 |
HIP 17335 |
26.56 |
| 2026-05-20 12:00 |
03:44:43.82 |
+05:43:50.2 |
HIP 17563 |
23.78 |
| 2026-05-21 00:00 |
03:45:04.00 |
+05:45:22.9 |
HIP 17563 |
19.81 |
| 2026-05-21 12:00 |
03:45:24.17 |
+05:46:55.1 |
HIP 17563 |
16.58 |
| 2026-05-22 00:00 |
03:45:44.33 |
+05:48:26.7 |
HIP 17563 |
14.59 |
| 2026-05-22 12:00 |
03:46:04.48 |
+05:49:57.7 |
HIP 17563 |
14.35 |
| 2026-05-23 00:00 |
03:46:24.63 |
+05:51:28.1 |
HIP 17563 |
15.93 |
| 2026-05-23 12:00 |
03:46:44.76 |
+05:52:57.9 |
HIP 17680 |
16.18 |
| 2026-05-24 00:00 |
03:47:04.88 |
+05:54:27.2 |
HIP 17680 |
13.00 |
| 2026-05-24 12:00 |
03:47:24.99 |
+05:55:55.9 |
HIP 17680 |
11.44 |
| 2026-05-25 00:00 |
03:47:45.08 |
+05:57:23.9 |
HIP 17680 |
12.14 |
| 2026-05-25 12:00 |
03:48:05.17 |
+05:58:51.4 |
HIP 17680 |
14.76 |
| 2026-05-26 00:00 |
03:48:25.24 |
+06:00:18.4 |
HIP 17817 |
18.45 |
| 2026-05-26 12:00 |
03:48:45.29 |
+06:01:44.7 |
HIP 17817 |
16.30 |
| 2026-05-27 00:00 |
03:49:05.33 |
+06:03:10.4 |
HIP 17817 |
15.66 |
| 2026-05-27 12:00 |
03:49:25.36 |
+06:04:35.6 |
HIP 17817 |
16.69 |
| 2026-05-28 00:00 |
03:49:45.37 |
+06:06:00.2 |
HIP 17817 |
19.12 |
| 2026-05-28 12:00 |
03:50:05.36 |
+06:07:24.2 |
HIP 17817 |
22.50 |
| 2026-05-29 00:00 |
03:50:25.34 |
+06:08:47.6 |
HIP 18058 |
21.42 |
| 2026-05-29 12:00 |
03:50:45.30 |
+06:10:10.4 |
HIP 18058 |
18.62 |
| 2026-05-30 00:00 |
03:51:05.24 |
+06:11:32.6 |
HIP 18058 |
16.96 |
| 2026-05-30 12:00 |
03:51:25.16 |
+06:12:54.2 |
HIP 18058 |
16.77 |
| 2026-05-31 00:00 |
03:51:45.06 |
+06:14:15.2 |
HIP 18058 |
18.09 |
| 2026-05-31 12:00 |
03:52:04.95 |
+06:15:35.7 |
HIP 18089 |
16.54 |
| 2026-06-01 00:00 |
03:52:24.81 |
+06:16:55.5 |
HIP 18089 |
16.35 |
| 2026-06-01 12:00 |
03:52:44.65 |
+06:18:14.8 |
HIP 18089 |
17.71 |
| 2026-06-02 00:00 |
03:53:04.47 |
+06:19:33.5 |
HIP 18089 |
20.30 |