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) |
| 2026-03-26 00:00 |
03:09:08.78 |
+01:58:54.1 |
HIP 14696 |
31.69 |
| 2026-03-26 12:00 |
03:09:25.75 |
+02:01:19.5 |
HIP 14786 |
28.51 |
| 2026-03-27 00:00 |
03:09:42.78 |
+02:03:44.5 |
HIP 14786 |
23.68 |
| 2026-03-27 12:00 |
03:09:59.88 |
+02:06:09.3 |
HIP 14786 |
18.88 |
| 2026-03-28 00:00 |
03:10:17.04 |
+02:08:33.7 |
HIP 14786 |
14.14 |
| 2026-03-28 12:00 |
03:10:34.27 |
+02:10:57.7 |
HIP 14786 |
9.58 |
| 2026-03-29 00:00 |
03:10:51.56 |
+02:13:21.4 |
HIP 14786 |
5.68 |
| 2026-03-29 12:00 |
03:11:08.91 |
+02:15:44.7 |
HIP 14786 |
4.65 |
| 2026-03-30 00:00 |
03:11:26.32 |
+02:18:07.7 |
HIP 14786 |
7.76 |
| 2026-03-30 12:00 |
03:11:43.80 |
+02:20:30.4 |
HIP 14786 |
12.18 |
| 2026-03-31 00:00 |
03:12:01.33 |
+02:22:52.6 |
HIP 14786 |
16.92 |
| 2026-03-31 12:00 |
03:12:18.92 |
+02:25:14.5 |
HIP 14956 |
18.05 |
| 2026-04-01 00:00 |
03:12:36.58 |
+02:27:36.1 |
HIP 14956 |
14.42 |
| 2026-04-01 12:00 |
03:12:54.29 |
+02:29:57.3 |
HIP 14956 |
11.84 |
| 2026-04-02 00:00 |
03:13:12.05 |
+02:32:18.1 |
HIP 14956 |
11.08 |
| 2026-04-02 12:00 |
03:13:29.88 |
+02:34:38.5 |
HIP 14956 |
12.50 |
| 2026-04-03 00:00 |
03:13:47.76 |
+02:36:58.6 |
HIP 15076 |
12.76 |
| 2026-04-03 12:00 |
03:14:05.69 |
+02:39:18.3 |
HIP 15090 |
9.73 |
| 2026-04-04 00:00 |
03:14:23.69 |
+02:41:37.6 |
HIP 15090 |
4.85 |
| 2026-04-04 12:00 |
03:14:41.73 |
+02:43:56.5 |
HIP 15090 |
1.87 |
| 2026-04-05 00:00 |
03:14:59.83 |
+02:46:15.0 |
HIP 15090 |
5.91 |
| 2026-04-05 12:00 |
03:15:17.98 |
+02:48:33.2 |
HIP 15090 |
10.87 |
| 2026-04-06 00:00 |
03:15:36.18 |
+02:50:50.9 |
HIP 15090 |
15.91 |
| 2026-04-06 12:00 |
03:15:54.44 |
+02:53:08.3 |
HIP 15090 |
20.99 |
| 2026-04-07 00:00 |
03:16:12.74 |
+02:55:25.3 |
HIP 15292 |
20.92 |
| 2026-04-07 12:00 |
03:16:31.10 |
+02:57:41.8 |
HIP 15292 |
15.94 |
| 2026-04-08 00:00 |
03:16:49.51 |
+02:59:58.0 |
HIP 15292 |
11.09 |
| 2026-04-08 12:00 |
03:17:07.96 |
+03:02:13.7 |
HIP 15292 |
6.66 |
| 2026-04-09 00:00 |
03:17:26.47 |
+03:04:29.1 |
HIP 15292 |
4.30 |
| 2026-04-09 12:00 |
03:17:45.02 |
+03:06:44.0 |
HIP 15292 |
6.76 |
| 2026-04-10 00:00 |
03:18:03.62 |
+03:08:58.6 |
HIP 15292 |
11.23 |
| 2026-04-10 12:00 |
03:18:22.26 |
+03:11:12.7 |
HIP 15292 |
16.13 |
| 2026-04-11 00:00 |
03:18:40.95 |
+03:13:26.4 |
HIP 15457 |
13.39 |
| 2026-04-11 12:00 |
03:18:59.69 |
+03:15:39.6 |
HIP 15457 |
8.51 |
| 2026-04-12 00:00 |
03:19:18.47 |
+03:17:52.5 |
HIP 15457 |
4.39 |
| 2026-04-12 12:00 |
03:19:37.29 |
+03:20:04.9 |
HIP 15457 |
4.47 |
| 2026-04-13 00:00 |
03:19:56.16 |
+03:22:16.8 |
HIP 15457 |
8.64 |
| 2026-04-13 12:00 |
03:20:15.07 |
+03:24:28.4 |
HIP 15457 |
13.55 |
| 2026-04-14 00:00 |
03:20:34.02 |
+03:26:39.5 |
HIP 15619 |
16.11 |
| 2026-04-14 12:00 |
03:20:53.01 |
+03:28:50.2 |
HIP 15619 |
12.20 |
| 2026-04-15 00:00 |
03:21:12.05 |
+03:31:00.4 |
HIP 15619 |
9.63 |
| 2026-04-15 12:00 |
03:21:31.12 |
+03:33:10.2 |
HIP 15619 |
9.55 |
| 2026-04-16 00:00 |
03:21:50.23 |
+03:35:19.5 |
HIP 15711 |
11.84 |