メタデータ
| 項目 |
値 |
| Designation |
C/2009 U5 (Grauer) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-06-22T11:50:14.052480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:37Z |
| Obs used |
182 |
| NEO |
- |
| M1 |
11.800 |
| 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) |
2010-02-02.0000000 |
| e |
0.99942402 |
| q (au) |
6.094240 |
| a (au) |
10580.667509 |
| i (deg) |
25.472676 |
| Ω (om, deg) |
121.174091 |
| ω (w, deg) |
23.813513 |
| M (ma, deg) |
359.999873 |
等級
散乱 + 全体線形
$$
M_a = (10.379 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.379 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
18:22:43.41 |
-10:58:06.2 |
HIP 90204 |
25.71 |
| 2026-05-12 12:00 |
18:22:40.99 |
-10:58:01.4 |
HIP 90204 |
26.23 |
| 2026-05-13 00:00 |
18:22:38.55 |
-10:57:56.7 |
HIP 90204 |
26.76 |
| 2026-05-13 12:00 |
18:22:36.08 |
-10:57:52.1 |
HIP 90204 |
27.30 |
| 2026-05-14 00:00 |
18:22:33.59 |
-10:57:47.6 |
HIP 90204 |
27.85 |
| 2026-05-14 12:00 |
18:22:31.07 |
-10:57:43.1 |
HIP 90204 |
28.41 |
| 2026-05-15 00:00 |
18:22:28.53 |
-10:57:38.8 |
HIP 90204 |
28.98 |
| 2026-05-15 12:00 |
18:22:25.97 |
-10:57:34.5 |
HIP 90204 |
29.56 |
| 2026-05-16 00:00 |
18:22:23.39 |
-10:57:30.3 |
HIP 90204 |
30.14 |
| 2026-05-16 12:00 |
18:22:20.78 |
-10:57:26.2 |
HIP 90204 |
30.73 |
| 2026-05-17 00:00 |
18:22:18.15 |
-10:57:22.3 |
HIP 90204 |
31.33 |
| 2026-05-17 12:00 |
18:22:15.50 |
-10:57:18.4 |
HIP 90204 |
31.94 |
| 2026-05-18 00:00 |
18:22:12.83 |
-10:57:14.6 |
HIP 90204 |
32.56 |
| 2026-05-18 12:00 |
18:22:10.13 |
-10:57:10.9 |
HIP 90204 |
33.18 |
| 2026-05-19 00:00 |
18:22:07.41 |
-10:57:07.2 |
HIP 90204 |
33.81 |
| 2026-05-19 12:00 |
18:22:04.68 |
-10:57:03.7 |
HIP 90204 |
34.44 |
| 2026-05-20 00:00 |
18:22:01.92 |
-10:57:00.3 |
HIP 90204 |
35.09 |
| 2026-05-20 12:00 |
18:21:59.14 |
-10:56:57.0 |
HIP 89800 |
34.86 |
| 2026-05-21 00:00 |
18:21:56.34 |
-10:56:53.7 |
HIP 89800 |
34.17 |
| 2026-05-21 12:00 |
18:21:53.52 |
-10:56:50.6 |
HIP 89800 |
33.48 |
| 2026-05-22 00:00 |
18:21:50.68 |
-10:56:47.6 |
HIP 89800 |
32.78 |
| 2026-05-22 12:00 |
18:21:47.82 |
-10:56:44.6 |
HIP 89800 |
32.08 |
| 2026-05-23 00:00 |
18:21:44.94 |
-10:56:41.8 |
HIP 89800 |
31.37 |
| 2026-05-23 12:00 |
18:21:42.04 |
-10:56:39.1 |
HIP 89800 |
30.66 |
| 2026-05-24 00:00 |
18:21:39.13 |
-10:56:36.4 |
HIP 89800 |
29.94 |
| 2026-05-24 12:00 |
18:21:36.19 |
-10:56:33.9 |
HIP 89800 |
29.22 |
| 2026-05-25 00:00 |
18:21:33.24 |
-10:56:31.4 |
HIP 89800 |
28.49 |
| 2026-05-25 12:00 |
18:21:30.27 |
-10:56:29.1 |
HIP 89800 |
27.77 |
| 2026-05-26 00:00 |
18:21:27.28 |
-10:56:26.8 |
HIP 89800 |
27.03 |
| 2026-05-26 12:00 |
18:21:24.27 |
-10:56:24.7 |
HIP 89800 |
26.29 |
| 2026-05-27 00:00 |
18:21:21.25 |
-10:56:22.6 |
HIP 89800 |
25.55 |
| 2026-05-27 12:00 |
18:21:18.21 |
-10:56:20.7 |
HIP 89800 |
24.80 |
| 2026-05-28 00:00 |
18:21:15.15 |
-10:56:18.8 |
HIP 89800 |
24.05 |
| 2026-05-28 12:00 |
18:21:12.08 |
-10:56:17.0 |
HIP 89800 |
23.30 |
| 2026-05-29 00:00 |
18:21:08.99 |
-10:56:15.4 |
HIP 89800 |
22.54 |
| 2026-05-29 12:00 |
18:21:05.88 |
-10:56:13.8 |
HIP 89800 |
21.78 |
| 2026-05-30 00:00 |
18:21:02.76 |
-10:56:12.4 |
HIP 89800 |
21.01 |
| 2026-05-30 12:00 |
18:20:59.63 |
-10:56:11.0 |
HIP 89800 |
20.24 |
| 2026-05-31 00:00 |
18:20:56.48 |
-10:56:09.8 |
HIP 89800 |
19.47 |
| 2026-05-31 12:00 |
18:20:53.31 |
-10:56:08.6 |
HIP 89800 |
18.69 |
| 2026-06-01 00:00 |
18:20:50.13 |
-10:56:07.6 |
HIP 89800 |
17.91 |
| 2026-06-01 12:00 |
18:20:46.93 |
-10:56:06.6 |
HIP 89800 |
17.12 |
| 2026-06-02 00:00 |
18:20:43.72 |
-10:56:05.8 |
HIP 89800 |
16.34 |