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
$$
M_a = (9.187 + 2.504\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.187 |
| n |
2.504 |
| 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 |
+2.1128 |
-2.842 |
| 2011-06-07 |
2011-12-23 |
-2.4195 |
-0.163 |
| 2011-12-24 |
2012-06-08 |
-0.1267 |
-0.782 |
| 2012-06-08 |
2014-02-26 |
+9.1201 |
-5.087 |
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 |
07:08:47.79 |
-38:16:01.8 |
HIP 34475 |
14.35 |
| 2026-09-20 12:00 |
07:08:48.99 |
-38:16:50.0 |
HIP 34475 |
15.17 |
| 2026-09-21 00:00 |
07:08:50.16 |
-38:17:38.2 |
HIP 34475 |
15.99 |
| 2026-09-21 12:00 |
07:08:51.28 |
-38:18:26.6 |
HIP 34475 |
16.81 |
| 2026-09-22 00:00 |
07:08:52.37 |
-38:19:15.1 |
HIP 34475 |
17.63 |
| 2026-09-22 12:00 |
07:08:53.43 |
-38:20:03.6 |
HIP 34475 |
18.46 |
| 2026-09-23 00:00 |
07:08:54.44 |
-38:20:52.3 |
HIP 34470 |
17.86 |
| 2026-09-23 12:00 |
07:08:55.42 |
-38:21:41.0 |
HIP 34470 |
17.09 |
| 2026-09-24 00:00 |
07:08:56.36 |
-38:22:29.8 |
HIP 34470 |
16.33 |
| 2026-09-24 12:00 |
07:08:57.27 |
-38:23:18.7 |
HIP 34470 |
15.57 |
| 2026-09-25 00:00 |
07:08:58.13 |
-38:24:07.7 |
HIP 34470 |
14.82 |
| 2026-09-25 12:00 |
07:08:58.96 |
-38:24:56.8 |
HIP 34470 |
14.08 |
| 2026-09-26 00:00 |
07:08:59.75 |
-38:25:46.0 |
HIP 34470 |
13.34 |
| 2026-09-26 12:00 |
07:09:00.51 |
-38:26:35.2 |
HIP 34470 |
12.61 |
| 2026-09-27 00:00 |
07:09:01.22 |
-38:27:24.5 |
HIP 34470 |
11.89 |
| 2026-09-27 12:00 |
07:09:01.90 |
-38:28:13.8 |
HIP 34470 |
11.18 |
| 2026-09-28 00:00 |
07:09:02.54 |
-38:29:03.2 |
HIP 34470 |
10.48 |
| 2026-09-28 12:00 |
07:09:03.14 |
-38:29:52.7 |
HIP 34470 |
9.80 |
| 2026-09-29 00:00 |
07:09:03.71 |
-38:30:42.3 |
HIP 34470 |
9.14 |
| 2026-09-29 12:00 |
07:09:04.23 |
-38:31:31.9 |
HIP 34470 |
8.51 |
| 2026-09-30 00:00 |
07:09:04.72 |
-38:32:21.5 |
HIP 34470 |
7.91 |
| 2026-09-30 12:00 |
07:09:05.17 |
-38:33:11.2 |
HIP 34470 |
7.35 |
| 2026-10-01 00:00 |
07:09:05.57 |
-38:34:00.9 |
HIP 34470 |
6.84 |
| 2026-10-01 12:00 |
07:09:05.94 |
-38:34:50.7 |
HIP 34470 |
6.39 |
| 2026-10-02 00:00 |
07:09:06.28 |
-38:35:40.5 |
HIP 34470 |
6.01 |
| 2026-10-02 12:00 |
07:09:06.57 |
-38:36:30.4 |
HIP 34470 |
5.73 |
| 2026-10-03 00:00 |
07:09:06.82 |
-38:37:20.3 |
HIP 34470 |
5.55 |
| 2026-10-03 12:00 |
07:09:07.04 |
-38:38:10.2 |
HIP 34470 |
5.48 |
| 2026-10-04 00:00 |
07:09:07.21 |
-38:39:00.1 |
HIP 34470 |
5.53 |
| 2026-10-04 12:00 |
07:09:07.34 |
-38:39:50.1 |
HIP 34470 |
5.70 |
| 2026-10-05 00:00 |
07:09:07.44 |
-38:40:40.0 |
HIP 34470 |
5.97 |
| 2026-10-05 12:00 |
07:09:07.50 |
-38:41:30.0 |
HIP 34470 |
6.33 |
| 2026-10-06 00:00 |
07:09:07.51 |
-38:42:20.0 |
HIP 34470 |
6.77 |
| 2026-10-06 12:00 |
07:09:07.49 |
-38:43:10.0 |
HIP 34470 |
7.28 |
| 2026-10-07 00:00 |
07:09:07.42 |
-38:44:00.0 |
HIP 34470 |
7.83 |
| 2026-10-07 12:00 |
07:09:07.32 |
-38:44:50.1 |
HIP 34470 |
8.43 |
| 2026-10-08 00:00 |
07:09:07.17 |
-38:45:40.1 |
HIP 34470 |
9.05 |
| 2026-10-08 12:00 |
07:09:06.99 |
-38:46:30.1 |
HIP 34470 |
9.71 |
| 2026-10-09 00:00 |
07:09:06.77 |
-38:47:20.0 |
HIP 34470 |
10.38 |
| 2026-10-09 12:00 |
07:09:06.50 |
-38:48:10.0 |
HIP 34470 |
11.08 |
| 2026-10-10 00:00 |
07:09:06.20 |
-38:49:00.0 |
HIP 34470 |
11.79 |
| 2026-10-10 12:00 |
07:09:05.85 |
-38:49:49.9 |
HIP 34470 |
12.51 |
| 2026-10-11 00:00 |
07:09:05.46 |
-38:50:39.8 |
HIP 34470 |
13.24 |