メタデータ
| 項目 |
値 |
| Designation |
C/2009 P1 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-12-23T16:15:40.786560Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T14:42:53Z |
| Obs used |
9048 |
| NEO |
- |
| M1 |
8.900 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-11-22.0000000 |
| e |
1.00099744 |
| q (au) |
1.550536 |
| a (au) |
-1554.522037 |
| i (deg) |
106.177292 |
| Ω (om, deg) |
325.997229 |
| ω (w, deg) |
90.747065 |
| M (ma, deg) |
-0.000509 |
等級
散乱 + 全体線形
$$
M_a = (9.188 + 2.506\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.188 |
| n |
2.506 |
| gf |
1.000 |
| gb |
-0.551 |
| 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 |
| 2008-09-27 |
2011-06-07 |
+2.0997 |
-2.834 |
| 2011-06-07 |
2011-12-23 |
-2.4286 |
-0.161 |
| 2011-12-24 |
2012-06-08 |
-0.1237 |
-0.783 |
| 2012-06-08 |
2014-02-26 |
+9.1194 |
-5.086 |
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) |
| 2026-05-12 00:00 |
06:53:48.50 |
-37:28:20.6 |
HIP 33213 |
12.48 |
| 2026-05-12 12:00 |
06:53:51.17 |
-37:27:46.8 |
HIP 33213 |
11.75 |
| 2026-05-13 00:00 |
06:53:53.86 |
-37:27:13.4 |
HIP 33213 |
11.02 |
| 2026-05-13 12:00 |
06:53:56.58 |
-37:26:40.2 |
HIP 33213 |
10.30 |
| 2026-05-14 00:00 |
06:53:59.33 |
-37:26:07.3 |
HIP 33213 |
9.57 |
| 2026-05-14 12:00 |
06:54:02.11 |
-37:25:34.8 |
HIP 33213 |
8.86 |
| 2026-05-15 00:00 |
06:54:04.92 |
-37:25:02.5 |
HIP 33213 |
8.15 |
| 2026-05-15 12:00 |
06:54:07.76 |
-37:24:30.4 |
HIP 33213 |
7.45 |
| 2026-05-16 00:00 |
06:54:10.62 |
-37:23:58.7 |
HIP 33213 |
6.76 |
| 2026-05-16 12:00 |
06:54:13.51 |
-37:23:27.3 |
HIP 33213 |
6.08 |
| 2026-05-17 00:00 |
06:54:16.42 |
-37:22:56.2 |
HIP 33213 |
5.44 |
| 2026-05-17 12:00 |
06:54:19.37 |
-37:22:25.4 |
HIP 33213 |
4.82 |
| 2026-05-18 00:00 |
06:54:22.34 |
-37:21:54.9 |
HIP 33213 |
4.25 |
| 2026-05-18 12:00 |
06:54:25.33 |
-37:21:24.6 |
HIP 33213 |
3.75 |
| 2026-05-19 00:00 |
06:54:28.35 |
-37:20:54.7 |
HIP 33213 |
3.35 |
| 2026-05-19 12:00 |
06:54:31.40 |
-37:20:25.1 |
HIP 33213 |
3.09 |
| 2026-05-20 00:00 |
06:54:34.48 |
-37:19:55.9 |
HIP 33213 |
3.01 |
| 2026-05-20 12:00 |
06:54:37.57 |
-37:19:26.9 |
HIP 33213 |
3.13 |
| 2026-05-21 00:00 |
06:54:40.70 |
-37:18:58.2 |
HIP 33213 |
3.41 |
| 2026-05-21 12:00 |
06:54:43.84 |
-37:18:29.9 |
HIP 33213 |
3.84 |
| 2026-05-22 00:00 |
06:54:47.02 |
-37:18:01.9 |
HIP 33213 |
4.36 |
| 2026-05-22 12:00 |
06:54:50.21 |
-37:17:34.2 |
HIP 33213 |
4.94 |
| 2026-05-23 00:00 |
06:54:53.43 |
-37:17:06.8 |
HIP 33213 |
5.57 |
| 2026-05-23 12:00 |
06:54:56.68 |
-37:16:39.8 |
HIP 33213 |
6.24 |
| 2026-05-24 00:00 |
06:54:59.94 |
-37:16:13.0 |
HIP 33213 |
6.93 |
| 2026-05-24 12:00 |
06:55:03.23 |
-37:15:46.6 |
HIP 33213 |
7.63 |
| 2026-05-25 00:00 |
06:55:06.54 |
-37:15:20.5 |
HIP 33213 |
8.35 |
| 2026-05-25 12:00 |
06:55:09.88 |
-37:14:54.8 |
HIP 33213 |
9.07 |
| 2026-05-26 00:00 |
06:55:13.24 |
-37:14:29.4 |
HIP 33213 |
9.81 |
| 2026-05-26 12:00 |
06:55:16.61 |
-37:14:04.3 |
HIP 33213 |
10.55 |
| 2026-05-27 00:00 |
06:55:20.02 |
-37:13:39.5 |
HIP 33213 |
11.30 |
| 2026-05-27 12:00 |
06:55:23.44 |
-37:13:15.1 |
HIP 33213 |
12.05 |
| 2026-05-28 00:00 |
06:55:26.88 |
-37:12:51.0 |
HIP 33213 |
12.81 |
| 2026-05-28 12:00 |
06:55:30.34 |
-37:12:27.2 |
HIP 33213 |
13.57 |
| 2026-05-29 00:00 |
06:55:33.83 |
-37:12:03.8 |
HIP 33213 |
14.33 |
| 2026-05-29 12:00 |
06:55:37.34 |
-37:11:40.7 |
HIP 33213 |
15.09 |
| 2026-05-30 00:00 |
06:55:40.86 |
-37:11:18.0 |
HIP 33213 |
15.86 |
| 2026-05-30 12:00 |
06:55:44.41 |
-37:10:55.6 |
HIP 33213 |
16.62 |
| 2026-05-31 00:00 |
06:55:47.97 |
-37:10:33.5 |
HIP 33213 |
17.39 |
| 2026-05-31 12:00 |
06:55:51.56 |
-37:10:11.8 |
HIP 33213 |
18.17 |
| 2026-06-01 00:00 |
06:55:55.16 |
-37:09:50.4 |
HIP 33213 |
18.94 |
| 2026-06-01 12:00 |
06:55:58.78 |
-37:09:29.4 |
HIP 33213 |
19.71 |
| 2026-06-02 00:00 |
06:56:02.42 |
-37:09:08.7 |
HIP 33213 |
20.49 |