メタデータ
| 項目 |
値 |
| Designation |
C/2008 P1 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-07-22T22:51:56.433600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:21Z |
| Obs used |
1345 |
| NEO |
- |
| M1 |
11.100 |
| 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) |
2009-08-25.0000000 |
| e |
1.00167859 |
| q (au) |
3.896111 |
| a (au) |
-2321.061664 |
| i (deg) |
64.310315 |
| Ω (om, deg) |
357.676994 |
| ω (w, deg) |
11.865464 |
| M (ma, deg) |
0.000291 |
等級
散乱 + 全体線形
$$
M_a = (10.382 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.382 |
| n |
2.000 |
| gf |
0.971 |
| gb |
-0.955 |
| k |
1.000 |
| δ90 |
9.891 |
| 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 |
| 2008-08-13 |
2009-07-21 |
-8.6915 |
+4.482 |
| 2009-07-23 |
2011-02-04 |
+5.2294 |
-3.081 |
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 |
11:45:34.86 |
+29:58:14.8 |
HIP 57395 |
16.63 |
| 2026-03-26 12:00 |
11:45:31.04 |
+29:58:25.2 |
HIP 57395 |
16.75 |
| 2026-03-27 00:00 |
11:45:27.23 |
+29:58:35.3 |
HIP 57239 |
16.79 |
| 2026-03-27 12:00 |
11:45:23.43 |
+29:58:45.2 |
HIP 57239 |
16.05 |
| 2026-03-28 00:00 |
11:45:19.63 |
+29:58:54.9 |
HIP 57239 |
15.33 |
| 2026-03-28 12:00 |
11:45:15.84 |
+29:59:04.3 |
HIP 57239 |
14.61 |
| 2026-03-29 00:00 |
11:45:12.06 |
+29:59:13.4 |
HIP 57239 |
13.91 |
| 2026-03-29 12:00 |
11:45:08.28 |
+29:59:22.2 |
HIP 57239 |
13.23 |
| 2026-03-30 00:00 |
11:45:04.52 |
+29:59:30.8 |
HIP 57239 |
12.56 |
| 2026-03-30 12:00 |
11:45:00.76 |
+29:59:39.1 |
HIP 57239 |
11.91 |
| 2026-03-31 00:00 |
11:44:57.01 |
+29:59:47.2 |
HIP 57239 |
11.29 |
| 2026-03-31 12:00 |
11:44:53.27 |
+29:59:55.0 |
HIP 57239 |
10.69 |
| 2026-04-01 00:00 |
11:44:49.54 |
+30:00:02.5 |
HIP 57239 |
10.12 |
| 2026-04-01 12:00 |
11:44:45.82 |
+30:00:09.8 |
HIP 57239 |
9.58 |
| 2026-04-02 00:00 |
11:44:42.11 |
+30:00:16.8 |
HIP 57239 |
9.09 |
| 2026-04-02 12:00 |
11:44:38.41 |
+30:00:23.5 |
HIP 57239 |
8.64 |
| 2026-04-03 00:00 |
11:44:34.72 |
+30:00:30.0 |
HIP 57239 |
8.24 |
| 2026-04-03 12:00 |
11:44:31.04 |
+30:00:36.1 |
HIP 57239 |
7.90 |
| 2026-04-04 00:00 |
11:44:27.38 |
+30:00:42.1 |
HIP 57239 |
7.63 |
| 2026-04-04 12:00 |
11:44:23.72 |
+30:00:47.7 |
HIP 57239 |
7.44 |
| 2026-04-05 00:00 |
11:44:20.08 |
+30:00:53.1 |
HIP 57239 |
7.32 |
| 2026-04-05 12:00 |
11:44:16.45 |
+30:00:58.2 |
HIP 57239 |
7.28 |
| 2026-04-06 00:00 |
11:44:12.83 |
+30:01:03.0 |
HIP 57239 |
7.33 |
| 2026-04-06 12:00 |
11:44:09.22 |
+30:01:07.6 |
HIP 57239 |
7.45 |
| 2026-04-07 00:00 |
11:44:05.62 |
+30:01:11.9 |
HIP 57239 |
7.65 |
| 2026-04-07 12:00 |
11:44:02.04 |
+30:01:15.9 |
HIP 57239 |
7.91 |
| 2026-04-08 00:00 |
11:43:58.47 |
+30:01:19.7 |
HIP 57239 |
8.23 |
| 2026-04-08 12:00 |
11:43:54.92 |
+30:01:23.1 |
HIP 57239 |
8.61 |
| 2026-04-09 00:00 |
11:43:51.38 |
+30:01:26.3 |
HIP 57239 |
9.03 |
| 2026-04-09 12:00 |
11:43:47.85 |
+30:01:29.3 |
HIP 57239 |
9.49 |
| 2026-04-10 00:00 |
11:43:44.34 |
+30:01:31.9 |
HIP 57239 |
9.98 |
| 2026-04-10 12:00 |
11:43:40.84 |
+30:01:34.3 |
HIP 57239 |
10.50 |
| 2026-04-11 00:00 |
11:43:37.36 |
+30:01:36.4 |
HIP 57239 |
11.04 |
| 2026-04-11 12:00 |
11:43:33.89 |
+30:01:38.2 |
HIP 57239 |
11.60 |
| 2026-04-12 00:00 |
11:43:30.44 |
+30:01:39.8 |
HIP 57239 |
12.18 |
| 2026-04-12 12:00 |
11:43:27.00 |
+30:01:41.1 |
HIP 57239 |
12.76 |
| 2026-04-13 00:00 |
11:43:23.58 |
+30:01:42.1 |
HIP 57239 |
13.36 |
| 2026-04-13 12:00 |
11:43:20.18 |
+30:01:42.8 |
HIP 57239 |
13.96 |
| 2026-04-14 00:00 |
11:43:16.79 |
+30:01:43.2 |
HIP 57239 |
14.58 |
| 2026-04-14 12:00 |
11:43:13.43 |
+30:01:43.4 |
HIP 57239 |
15.19 |
| 2026-04-15 00:00 |
11:43:10.07 |
+30:01:43.3 |
HIP 57239 |
15.81 |
| 2026-04-15 12:00 |
11:43:06.74 |
+30:01:42.9 |
HIP 57239 |
16.44 |
| 2026-04-16 00:00 |
11:43:03.42 |
+30:01:42.2 |
HIP 57239 |
17.06 |