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) |
| 2026-09-20 00:00 |
05:00:31.07 |
+49:36:19.5 |
HIP 23147 |
21.88 |
| 2026-09-20 12:00 |
05:00:29.80 |
+49:36:39.0 |
HIP 23147 |
21.51 |
| 2026-09-21 00:00 |
05:00:28.49 |
+49:36:58.4 |
HIP 23147 |
21.14 |
| 2026-09-21 12:00 |
05:00:27.13 |
+49:37:17.7 |
HIP 23147 |
20.76 |
| 2026-09-22 00:00 |
05:00:25.73 |
+49:37:37.0 |
HIP 23147 |
20.38 |
| 2026-09-22 12:00 |
05:00:24.29 |
+49:37:56.2 |
HIP 23147 |
19.99 |
| 2026-09-23 00:00 |
05:00:22.80 |
+49:38:15.3 |
HIP 23147 |
19.60 |
| 2026-09-23 12:00 |
05:00:21.27 |
+49:38:34.3 |
HIP 23147 |
19.21 |
| 2026-09-24 00:00 |
05:00:19.70 |
+49:38:53.2 |
HIP 23147 |
18.81 |
| 2026-09-24 12:00 |
05:00:18.08 |
+49:39:12.1 |
HIP 23147 |
18.41 |
| 2026-09-25 00:00 |
05:00:16.43 |
+49:39:30.9 |
HIP 23147 |
18.00 |
| 2026-09-25 12:00 |
05:00:14.73 |
+49:39:49.6 |
HIP 23147 |
17.59 |
| 2026-09-26 00:00 |
05:00:12.98 |
+49:40:08.2 |
HIP 23147 |
17.18 |
| 2026-09-26 12:00 |
05:00:11.20 |
+49:40:26.8 |
HIP 23147 |
16.76 |
| 2026-09-27 00:00 |
05:00:09.37 |
+49:40:45.2 |
HIP 23147 |
16.33 |
| 2026-09-27 12:00 |
05:00:07.50 |
+49:41:03.5 |
HIP 23147 |
15.91 |
| 2026-09-28 00:00 |
05:00:05.58 |
+49:41:21.8 |
HIP 23147 |
15.47 |
| 2026-09-28 12:00 |
05:00:03.63 |
+49:41:40.0 |
HIP 23147 |
15.04 |
| 2026-09-29 00:00 |
05:00:01.63 |
+49:41:58.0 |
HIP 23147 |
14.60 |
| 2026-09-29 12:00 |
04:59:59.59 |
+49:42:16.0 |
HIP 23147 |
14.15 |
| 2026-09-30 00:00 |
04:59:57.50 |
+49:42:33.9 |
HIP 23147 |
13.70 |
| 2026-09-30 12:00 |
04:59:55.38 |
+49:42:51.6 |
HIP 23147 |
13.25 |
| 2026-10-01 00:00 |
04:59:53.21 |
+49:43:09.3 |
HIP 23147 |
12.79 |
| 2026-10-01 12:00 |
04:59:51.00 |
+49:43:26.9 |
HIP 23147 |
12.33 |
| 2026-10-02 00:00 |
04:59:48.75 |
+49:43:44.3 |
HIP 23147 |
11.87 |
| 2026-10-02 12:00 |
04:59:46.46 |
+49:44:01.7 |
HIP 23147 |
11.40 |
| 2026-10-03 00:00 |
04:59:44.12 |
+49:44:18.9 |
HIP 23147 |
10.92 |
| 2026-10-03 12:00 |
04:59:41.75 |
+49:44:36.0 |
HIP 23147 |
10.44 |
| 2026-10-04 00:00 |
04:59:39.33 |
+49:44:53.1 |
HIP 23147 |
9.96 |
| 2026-10-04 12:00 |
04:59:36.87 |
+49:45:10.0 |
HIP 23147 |
9.47 |
| 2026-10-05 00:00 |
04:59:34.37 |
+49:45:26.8 |
HIP 23147 |
8.98 |
| 2026-10-05 12:00 |
04:59:31.83 |
+49:45:43.4 |
HIP 23147 |
8.49 |
| 2026-10-06 00:00 |
04:59:29.24 |
+49:46:00.0 |
HIP 23147 |
7.99 |
| 2026-10-06 12:00 |
04:59:26.62 |
+49:46:16.4 |
HIP 23147 |
7.49 |
| 2026-10-07 00:00 |
04:59:23.95 |
+49:46:32.7 |
HIP 23147 |
6.98 |
| 2026-10-07 12:00 |
04:59:21.24 |
+49:46:48.9 |
HIP 23147 |
6.48 |
| 2026-10-08 00:00 |
04:59:18.50 |
+49:47:05.0 |
HIP 23147 |
5.96 |
| 2026-10-08 12:00 |
04:59:15.71 |
+49:47:20.9 |
HIP 23147 |
5.45 |
| 2026-10-09 00:00 |
04:59:12.88 |
+49:47:36.7 |
HIP 23147 |
4.94 |
| 2026-10-09 12:00 |
04:59:10.01 |
+49:47:52.4 |
HIP 23147 |
4.42 |
| 2026-10-10 00:00 |
04:59:07.10 |
+49:48:07.9 |
HIP 23147 |
3.91 |
| 2026-10-10 12:00 |
04:59:04.16 |
+49:48:23.3 |
HIP 23147 |
3.40 |
| 2026-10-11 00:00 |
04:59:01.17 |
+49:48:38.6 |
HIP 23147 |
2.90 |