メタデータ
| 項目 |
値 |
| Designation |
186P/Garradd |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-05-28T23:37:34.250880Z |
| Orbit solution date (soln_date, UTC) |
2022-12-08T23:43:24Z |
| Obs used |
880 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
12.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-08-03.0000000 |
| e |
0.12684331 |
| q (au) |
4.321945 |
| a (au) |
4.949793 |
| i (deg) |
28.544006 |
| Ω (om, deg) |
327.580045 |
| ω (w, deg) |
287.339155 |
| M (ma, deg) |
103.910997 |
等級
散乱 + 全体線形
$$
M_a = (8.628 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.628 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.829 |
| k |
0.800 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2016-05-02 |
2022-11-04 |
+52.8866 |
-34.022 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
06:47:25.39 |
+40:59:03.2 |
HIP 32626 |
10.79 |
| 2026-03-26 12:00 |
06:47:33.34 |
+40:56:15.1 |
HIP 32626 |
9.33 |
| 2026-03-27 00:00 |
06:47:41.53 |
+40:53:27.1 |
HIP 32626 |
8.79 |
| 2026-03-27 12:00 |
06:47:49.95 |
+40:50:39.2 |
HIP 32626 |
9.35 |
| 2026-03-28 00:00 |
06:47:58.60 |
+40:47:51.4 |
HIP 32626 |
10.85 |
| 2026-03-28 12:00 |
06:48:07.47 |
+40:45:03.8 |
HIP 32626 |
12.99 |
| 2026-03-29 00:00 |
06:48:16.57 |
+40:42:16.3 |
HIP 32626 |
15.52 |
| 2026-03-29 12:00 |
06:48:25.89 |
+40:39:29.0 |
HIP 32626 |
18.28 |
| 2026-03-30 00:00 |
06:48:35.44 |
+40:36:41.8 |
HIP 32626 |
21.21 |
| 2026-03-30 12:00 |
06:48:45.21 |
+40:33:54.8 |
HIP 32626 |
24.24 |
| 2026-03-31 00:00 |
06:48:55.20 |
+40:31:07.9 |
HIP 32719 |
21.86 |
| 2026-03-31 12:00 |
06:49:05.40 |
+40:28:21.1 |
HIP 32719 |
18.61 |
| 2026-04-01 00:00 |
06:49:15.82 |
+40:25:34.6 |
HIP 32719 |
15.41 |
| 2026-04-01 12:00 |
06:49:26.46 |
+40:22:48.2 |
HIP 32719 |
12.33 |
| 2026-04-02 00:00 |
06:49:37.31 |
+40:20:01.9 |
HIP 32719 |
9.50 |
| 2026-04-02 12:00 |
06:49:48.37 |
+40:17:15.9 |
HIP 32719 |
7.26 |
| 2026-04-03 00:00 |
06:49:59.65 |
+40:14:30.0 |
HIP 32719 |
6.31 |
| 2026-04-03 12:00 |
06:50:11.13 |
+40:11:44.2 |
HIP 32719 |
7.21 |
| 2026-04-04 00:00 |
06:50:22.82 |
+40:08:58.7 |
HIP 32719 |
9.48 |
| 2026-04-04 12:00 |
06:50:34.72 |
+40:06:13.3 |
HIP 32792 |
10.04 |
| 2026-04-05 00:00 |
06:50:46.82 |
+40:03:28.1 |
HIP 32792 |
9.18 |
| 2026-04-05 12:00 |
06:50:59.13 |
+40:00:43.1 |
HIP 32792 |
9.72 |
| 2026-04-06 00:00 |
06:51:11.63 |
+39:57:58.3 |
HIP 32792 |
11.48 |
| 2026-04-06 12:00 |
06:51:24.34 |
+39:55:13.6 |
HIP 33002 |
13.81 |
| 2026-04-07 00:00 |
06:51:37.25 |
+39:52:29.2 |
HIP 33002 |
11.78 |
| 2026-04-07 12:00 |
06:51:50.36 |
+39:49:44.9 |
HIP 33002 |
10.66 |
| 2026-04-08 00:00 |
06:52:03.67 |
+39:47:00.8 |
HIP 33002 |
10.74 |
| 2026-04-08 12:00 |
06:52:17.17 |
+39:44:16.9 |
HIP 33002 |
12.03 |
| 2026-04-09 00:00 |
06:52:30.86 |
+39:41:33.2 |
HIP 33002 |
14.22 |
| 2026-04-09 12:00 |
06:52:44.75 |
+39:38:49.7 |
HIP 33103 |
13.37 |
| 2026-04-10 00:00 |
06:52:58.83 |
+39:36:06.3 |
HIP 33103 |
13.28 |
| 2026-04-10 12:00 |
06:53:13.10 |
+39:33:23.2 |
HIP 33103 |
14.24 |
| 2026-04-11 00:00 |
06:53:27.56 |
+39:30:40.3 |
HIP 33103 |
16.09 |
| 2026-04-11 12:00 |
06:53:42.21 |
+39:27:57.5 |
HIP 33120 |
17.90 |
| 2026-04-12 00:00 |
06:53:57.04 |
+39:25:15.0 |
HIP 33120 |
15.09 |
| 2026-04-12 12:00 |
06:54:12.06 |
+39:22:32.6 |
HIP 33120 |
12.89 |
| 2026-04-13 00:00 |
06:54:27.26 |
+39:19:50.4 |
HIP 33120 |
11.71 |
| 2026-04-13 12:00 |
06:54:42.65 |
+39:17:08.5 |
HIP 33120 |
11.85 |
| 2026-04-14 00:00 |
06:54:58.21 |
+39:14:26.7 |
HIP 33120 |
13.32 |
| 2026-04-14 12:00 |
06:55:13.96 |
+39:11:45.1 |
HIP 33120 |
15.75 |
| 2026-04-15 00:00 |
06:55:29.88 |
+39:09:03.8 |
HIP 33120 |
18.80 |
| 2026-04-15 12:00 |
06:55:45.99 |
+39:06:22.6 |
HIP 33120 |
22.22 |
| 2026-04-16 00:00 |
06:56:02.26 |
+39:03:41.6 |
HIP 33479 |
24.55 |