メタデータ
| 項目 |
値 |
| Designation |
C/2008 Q3 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-06-23T02:14:05.628480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:22Z |
| Obs used |
701 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
16.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-08-27.0000000 |
| e |
0.99979780 |
| q (au) |
1.798229 |
| a (au) |
8893.448410 |
| i (deg) |
140.706611 |
| Ω (om, deg) |
219.734004 |
| ω (w, deg) |
340.855249 |
| M (ma, deg) |
0.000076 |
等級
散乱 + 全体線形
$$
M_a = (6.290 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.290 |
| n |
6.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2008-08-27 |
2009-06-22 |
+8.4849 |
-4.214 |
| 2009-06-23 |
2009-12-15 |
+8.2759 |
-4.371 |
| 2009-12-15 |
2010-06-03 |
-2.7074 |
+1.180 |
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 |
04:42:57.07 |
+49:01:39.8 |
HIP 21800 |
28.86 |
| 2026-03-26 12:00 |
04:42:58.79 |
+49:01:19.4 |
HIP 21800 |
28.80 |
| 2026-03-27 00:00 |
04:43:00.56 |
+49:00:59.1 |
HIP 21800 |
28.75 |
| 2026-03-27 12:00 |
04:43:02.36 |
+49:00:38.9 |
HIP 21800 |
28.71 |
| 2026-03-28 00:00 |
04:43:04.20 |
+49:00:18.9 |
HIP 21800 |
28.69 |
| 2026-03-28 12:00 |
04:43:06.08 |
+48:59:59.0 |
HIP 21800 |
28.68 |
| 2026-03-29 00:00 |
04:43:08.00 |
+48:59:39.3 |
HIP 21800 |
28.68 |
| 2026-03-29 12:00 |
04:43:09.96 |
+48:59:19.7 |
HIP 21800 |
28.70 |
| 2026-03-30 00:00 |
04:43:11.95 |
+48:59:00.2 |
HIP 21800 |
28.73 |
| 2026-03-30 12:00 |
04:43:13.98 |
+48:58:40.9 |
HIP 21800 |
28.77 |
| 2026-03-31 00:00 |
04:43:16.05 |
+48:58:21.7 |
HIP 21800 |
28.83 |
| 2026-03-31 12:00 |
04:43:18.15 |
+48:58:02.7 |
HIP 21800 |
28.90 |
| 2026-04-01 00:00 |
04:43:20.29 |
+48:57:43.8 |
HIP 21800 |
28.99 |
| 2026-04-01 12:00 |
04:43:22.47 |
+48:57:25.0 |
HIP 21800 |
29.09 |
| 2026-04-02 00:00 |
04:43:24.68 |
+48:57:06.4 |
HIP 21800 |
29.20 |
| 2026-04-02 12:00 |
04:43:26.93 |
+48:56:48.0 |
HIP 21800 |
29.33 |
| 2026-04-03 00:00 |
04:43:29.22 |
+48:56:29.6 |
HIP 21800 |
29.47 |
| 2026-04-03 12:00 |
04:43:31.54 |
+48:56:11.5 |
HIP 21800 |
29.62 |
| 2026-04-04 00:00 |
04:43:33.90 |
+48:55:53.4 |
HIP 21800 |
29.79 |
| 2026-04-04 12:00 |
04:43:36.29 |
+48:55:35.6 |
HIP 21800 |
29.97 |
| 2026-04-05 00:00 |
04:43:38.71 |
+48:55:17.8 |
HIP 21800 |
30.16 |
| 2026-04-05 12:00 |
04:43:41.17 |
+48:55:00.3 |
HIP 21800 |
30.37 |
| 2026-04-06 00:00 |
04:43:43.67 |
+48:54:42.8 |
HIP 21800 |
30.59 |
| 2026-04-06 12:00 |
04:43:46.20 |
+48:54:25.6 |
HIP 21800 |
30.82 |
| 2026-04-07 00:00 |
04:43:48.76 |
+48:54:08.4 |
HIP 21800 |
31.07 |
| 2026-04-07 12:00 |
04:43:51.36 |
+48:53:51.5 |
HIP 21800 |
31.32 |
| 2026-04-08 00:00 |
04:43:53.99 |
+48:53:34.7 |
HIP 21800 |
31.59 |
| 2026-04-08 12:00 |
04:43:56.65 |
+48:53:18.0 |
HIP 21800 |
31.88 |
| 2026-04-09 00:00 |
04:43:59.35 |
+48:53:01.5 |
HIP 21800 |
32.17 |
| 2026-04-09 12:00 |
04:44:02.08 |
+48:52:45.2 |
HIP 21800 |
32.48 |
| 2026-04-10 00:00 |
04:44:04.84 |
+48:52:29.0 |
HIP 21800 |
32.80 |
| 2026-04-10 12:00 |
04:44:07.64 |
+48:52:13.0 |
HIP 21800 |
33.13 |
| 2026-04-11 00:00 |
04:44:10.47 |
+48:51:57.1 |
HIP 21800 |
33.47 |
| 2026-04-11 12:00 |
04:44:13.32 |
+48:51:41.4 |
HIP 21800 |
33.82 |
| 2026-04-12 00:00 |
04:44:16.22 |
+48:51:25.8 |
HIP 21800 |
34.18 |
| 2026-04-12 12:00 |
04:44:19.14 |
+48:51:10.4 |
HIP 21800 |
34.55 |
| 2026-04-13 00:00 |
04:44:22.09 |
+48:50:55.2 |
HIP 21800 |
34.94 |
| 2026-04-13 12:00 |
04:44:25.08 |
+48:50:40.1 |
HIP 21800 |
35.33 |
| 2026-04-14 00:00 |
04:44:28.10 |
+48:50:25.2 |
HIP 21800 |
35.73 |
| 2026-04-14 12:00 |
04:44:31.14 |
+48:50:10.5 |
HIP 21800 |
36.15 |
| 2026-04-15 00:00 |
04:44:34.22 |
+48:49:55.9 |
HIP 21800 |
36.57 |
| 2026-04-15 12:00 |
04:44:37.33 |
+48:49:41.5 |
HIP 21800 |
37.00 |
| 2026-04-16 00:00 |
04:44:40.46 |
+48:49:27.3 |
HIP 21800 |
37.44 |