186P/Garradd
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) |
| 2026-02-03 00:00 |
06:57:00.47 |
+45:25:09.7 |
HIP 33485 |
20.55 |
| 2026-02-03 12:00 |
06:56:41.43 |
+45:23:09.8 |
HIP 33485 |
20.07 |
| 2026-02-04 00:00 |
06:56:22.61 |
+45:21:08.5 |
HIP 33485 |
20.31 |
| 2026-02-04 12:00 |
06:56:04.02 |
+45:19:06.0 |
HIP 33171 |
19.96 |
| 2026-02-05 00:00 |
06:55:45.66 |
+45:17:02.2 |
HIP 33171 |
17.72 |
| 2026-02-05 12:00 |
06:55:27.54 |
+45:14:57.1 |
HIP 33171 |
16.13 |
| 2026-02-06 00:00 |
06:55:09.65 |
+45:12:50.8 |
HIP 33171 |
15.37 |
| 2026-02-06 12:00 |
06:54:52.00 |
+45:10:43.2 |
HIP 33171 |
15.57 |
| 2026-02-07 00:00 |
06:54:34.59 |
+45:08:34.4 |
HIP 33171 |
16.66 |
| 2026-02-07 12:00 |
06:54:17.42 |
+45:06:24.5 |
HIP 33171 |
18.48 |
| 2026-02-08 00:00 |
06:54:00.49 |
+45:04:13.3 |
HIP 33056 |
16.69 |
| 2026-02-08 12:00 |
06:53:43.82 |
+45:02:01.1 |
HIP 33056 |
13.27 |
| 2026-02-09 00:00 |
06:53:27.39 |
+44:59:47.6 |
HIP 33056 |
10.02 |
| 2026-02-09 12:00 |
06:53:11.21 |
+44:57:33.1 |
HIP 33056 |
7.18 |
| 2026-02-10 00:00 |
06:52:55.29 |
+44:55:17.4 |
HIP 33056 |
5.35 |
| 2026-02-10 12:00 |
06:52:39.62 |
+44:53:00.7 |
HIP 33056 |
5.60 |
| 2026-02-11 00:00 |
06:52:24.21 |
+44:50:42.9 |
HIP 33056 |
7.69 |
| 2026-02-11 12:00 |
06:52:09.06 |
+44:48:24.1 |
HIP 33056 |
10.57 |
| 2026-02-12 00:00 |
06:51:54.17 |
+44:46:04.3 |
HIP 33056 |
13.72 |
| 2026-02-12 12:00 |
06:51:39.54 |
+44:43:43.4 |
HIP 33056 |
16.99 |
| 2026-02-13 00:00 |
06:51:25.18 |
+44:41:21.6 |
HIP 33056 |
20.30 |
| 2026-02-13 12:00 |
06:51:11.08 |
+44:38:58.8 |
HIP 33056 |
23.63 |
| 2026-02-14 00:00 |
06:50:57.25 |
+44:36:35.0 |
HIP 33056 |
26.96 |
| 2026-02-14 12:00 |
06:50:43.69 |
+44:34:10.4 |
HIP 33056 |
30.28 |
| 2026-02-15 00:00 |
06:50:30.40 |
+44:31:44.8 |
HIP 32891 |
29.12 |
| 2026-02-15 12:00 |
06:50:17.38 |
+44:29:18.4 |
HIP 32891 |
27.50 |
| 2026-02-16 00:00 |
06:50:04.63 |
+44:26:51.0 |
HIP 32891 |
26.19 |
| 2026-02-16 12:00 |
06:49:52.16 |
+44:24:22.9 |
HIP 32891 |
25.22 |
| 2026-02-17 00:00 |
06:49:39.96 |
+44:21:53.9 |
HIP 32891 |
24.62 |
| 2026-02-17 12:00 |
06:49:28.05 |
+44:19:24.1 |
HIP 32891 |
24.41 |
| 2026-02-18 00:00 |
06:49:16.40 |
+44:16:53.5 |
HIP 32891 |
24.59 |
| 2026-02-18 12:00 |
06:49:05.04 |
+44:14:22.1 |
HIP 32665 |
24.45 |
| 2026-02-19 00:00 |
06:48:53.96 |
+44:11:50.0 |
HIP 32665 |
21.76 |
| 2026-02-19 12:00 |
06:48:43.16 |
+44:09:17.1 |
HIP 32665 |
19.22 |
| 2026-02-20 00:00 |
06:48:32.63 |
+44:06:43.5 |
HIP 32665 |
16.90 |
| 2026-02-20 12:00 |
06:48:22.40 |
+44:04:09.3 |
HIP 32665 |
14.86 |
| 2026-02-21 00:00 |
06:48:12.44 |
+44:01:34.3 |
HIP 32665 |
13.24 |
| 2026-02-21 12:00 |
06:48:02.76 |
+43:58:58.7 |
HIP 32665 |
12.19 |
| 2026-02-22 00:00 |
06:47:53.37 |
+43:56:22.5 |
HIP 32665 |
11.84 |
| 2026-02-22 12:00 |
06:47:44.27 |
+43:53:45.7 |
HIP 32665 |
12.24 |
| 2026-02-23 00:00 |
06:47:35.44 |
+43:51:08.2 |
HIP 32665 |
13.32 |
| 2026-02-23 12:00 |
06:47:26.90 |
+43:48:30.2 |
HIP 32665 |
14.91 |
| 2026-02-24 00:00 |
06:47:18.65 |
+43:45:51.6 |
HIP 32480 |
12.84 |