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) |
| 2026-09-20 00:00 |
09:13:59.30 |
+26:11:37.0 |
HIP 45304 |
1.07 |
| 2026-09-20 12:00 |
09:14:22.88 |
+26:09:26.7 |
HIP 45304 |
5.15 |
| 2026-09-21 00:00 |
09:14:46.38 |
+26:07:16.8 |
HIP 45304 |
10.81 |
| 2026-09-21 12:00 |
09:15:09.78 |
+26:05:07.3 |
HIP 45304 |
16.48 |
| 2026-09-22 00:00 |
09:15:33.09 |
+26:02:58.1 |
HIP 45304 |
22.14 |
| 2026-09-22 12:00 |
09:15:56.32 |
+26:00:49.2 |
HIP 45612 |
25.71 |
| 2026-09-23 00:00 |
09:16:19.45 |
+25:58:40.7 |
HIP 45612 |
20.63 |
| 2026-09-23 12:00 |
09:16:42.48 |
+25:56:32.6 |
HIP 45612 |
15.91 |
| 2026-09-24 00:00 |
09:17:05.43 |
+25:54:24.9 |
HIP 45612 |
12.00 |
| 2026-09-24 12:00 |
09:17:28.28 |
+25:52:17.5 |
HIP 45612 |
9.86 |
| 2026-09-25 00:00 |
09:17:51.04 |
+25:50:10.6 |
HIP 45612 |
10.58 |
| 2026-09-25 12:00 |
09:18:13.70 |
+25:48:04.0 |
HIP 45612 |
13.70 |
| 2026-09-26 00:00 |
09:18:36.26 |
+25:45:57.8 |
HIP 45612 |
17.99 |
| 2026-09-26 12:00 |
09:18:58.73 |
+25:43:51.9 |
HIP 45612 |
22.78 |
| 2026-09-27 00:00 |
09:19:21.10 |
+25:41:46.5 |
HIP 45612 |
27.81 |
| 2026-09-27 12:00 |
09:19:43.38 |
+25:39:41.5 |
HIP 45739 |
28.89 |
| 2026-09-28 00:00 |
09:20:05.55 |
+25:37:36.9 |
HIP 45897 |
24.46 |
| 2026-09-28 12:00 |
09:20:27.63 |
+25:35:32.7 |
HIP 45897 |
19.42 |
| 2026-09-29 00:00 |
09:20:49.60 |
+25:33:28.9 |
HIP 45897 |
14.66 |
| 2026-09-29 12:00 |
09:21:11.47 |
+25:31:25.5 |
HIP 45897 |
10.51 |
| 2026-09-30 00:00 |
09:21:33.25 |
+25:29:22.6 |
HIP 45897 |
7.95 |
| 2026-09-30 12:00 |
09:21:54.92 |
+25:27:20.0 |
HIP 45897 |
8.52 |
| 2026-10-01 00:00 |
09:22:16.48 |
+25:25:17.9 |
HIP 45897 |
11.74 |
| 2026-10-01 12:00 |
09:22:37.94 |
+25:23:16.3 |
HIP 45897 |
16.06 |
| 2026-10-02 00:00 |
09:22:59.30 |
+25:21:15.1 |
HIP 46058 |
12.64 |
| 2026-10-02 12:00 |
09:23:20.55 |
+25:19:14.3 |
HIP 46058 |
8.65 |
| 2026-10-03 00:00 |
09:23:41.70 |
+25:17:14.0 |
HIP 46058 |
6.65 |
| 2026-10-03 12:00 |
09:24:02.73 |
+25:15:14.1 |
HIP 46058 |
8.18 |
| 2026-10-04 00:00 |
09:24:23.66 |
+25:13:14.7 |
HIP 46180 |
8.20 |
| 2026-10-04 12:00 |
09:24:44.48 |
+25:11:15.8 |
HIP 46180 |
4.14 |
| 2026-10-05 00:00 |
09:25:05.18 |
+25:09:17.4 |
HIP 46180 |
4.37 |
| 2026-10-05 12:00 |
09:25:25.78 |
+25:07:19.4 |
HIP 46180 |
8.50 |
| 2026-10-06 00:00 |
09:25:46.26 |
+25:05:21.9 |
HIP 46180 |
13.27 |
| 2026-10-06 12:00 |
09:26:06.63 |
+25:03:24.9 |
HIP 46180 |
18.15 |
| 2026-10-07 00:00 |
09:26:26.88 |
+25:01:28.4 |
HIP 46405 |
22.71 |
| 2026-10-07 12:00 |
09:26:47.02 |
+24:59:32.4 |
HIP 46405 |
20.60 |
| 2026-10-08 00:00 |
09:27:07.04 |
+24:57:36.9 |
HIP 46405 |
19.54 |
| 2026-10-08 12:00 |
09:27:26.95 |
+24:55:41.9 |
HIP 46405 |
19.70 |
| 2026-10-09 00:00 |
09:27:46.73 |
+24:53:47.5 |
HIP 46405 |
21.01 |
| 2026-10-09 12:00 |
09:28:06.40 |
+24:51:53.5 |
HIP 46405 |
23.28 |
| 2026-10-10 00:00 |
09:28:25.94 |
+24:50:00.1 |
HIP 46595 |
24.47 |
| 2026-10-10 12:00 |
09:28:45.36 |
+24:48:07.2 |
HIP 46595 |
19.68 |
| 2026-10-11 00:00 |
09:29:04.66 |
+24:46:14.9 |
HIP 46595 |
14.92 |