メタデータ
| 項目 |
値 |
| Designation |
C/2007 E1 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-05-23T19:56:03.209280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:05Z |
| Obs used |
1017 |
| NEO |
- |
| M1 |
13.900 |
| K1 |
9.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2007-05-21.0000000 |
| e |
0.98021742 |
| q (au) |
1.285863 |
| a (au) |
64.999734 |
| i (deg) |
174.393993 |
| Ω (om, deg) |
153.826639 |
| ω (w, deg) |
7.102013 |
| M (ma, deg) |
359.994676 |
等級
散乱 + 全体線形
$$
M_a = (12.954 + 4.197\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.954 |
| n |
4.197 |
| gf |
0.997 |
| gb |
-0.945 |
| 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 |
| 2007-03-13 |
2007-05-20 |
+25.1520 |
-4.738 |
| 2007-05-26 |
2007-12-27 |
+6.4550 |
-2.958 |
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 |
23:08:49.79 |
-04:18:42.7 |
HIP 114325 |
23.27 |
| 2026-05-12 12:00 |
23:08:50.94 |
-04:18:34.8 |
HIP 114325 |
23.07 |
| 2026-05-13 00:00 |
23:08:52.06 |
-04:18:27.1 |
HIP 114325 |
22.87 |
| 2026-05-13 12:00 |
23:08:53.16 |
-04:18:19.5 |
HIP 114325 |
22.68 |
| 2026-05-14 00:00 |
23:08:54.23 |
-04:18:12.1 |
HIP 114325 |
22.50 |
| 2026-05-14 12:00 |
23:08:55.29 |
-04:18:04.8 |
HIP 114325 |
22.32 |
| 2026-05-15 00:00 |
23:08:56.32 |
-04:17:57.6 |
HIP 114325 |
22.15 |
| 2026-05-15 12:00 |
23:08:57.32 |
-04:17:50.6 |
HIP 114325 |
21.98 |
| 2026-05-16 00:00 |
23:08:58.31 |
-04:17:43.7 |
HIP 114325 |
21.82 |
| 2026-05-16 12:00 |
23:08:59.27 |
-04:17:37.0 |
HIP 114325 |
21.67 |
| 2026-05-17 00:00 |
23:09:00.21 |
-04:17:30.4 |
HIP 114325 |
21.52 |
| 2026-05-17 12:00 |
23:09:01.12 |
-04:17:23.9 |
HIP 114325 |
21.37 |
| 2026-05-18 00:00 |
23:09:02.01 |
-04:17:17.6 |
HIP 114325 |
21.23 |
| 2026-05-18 12:00 |
23:09:02.88 |
-04:17:11.5 |
HIP 114325 |
21.10 |
| 2026-05-19 00:00 |
23:09:03.72 |
-04:17:05.5 |
HIP 114325 |
20.97 |
| 2026-05-19 12:00 |
23:09:04.54 |
-04:16:59.6 |
HIP 114325 |
20.85 |
| 2026-05-20 00:00 |
23:09:05.34 |
-04:16:53.9 |
HIP 114355 |
20.70 |
| 2026-05-20 12:00 |
23:09:06.11 |
-04:16:48.3 |
HIP 114355 |
20.54 |
| 2026-05-21 00:00 |
23:09:06.85 |
-04:16:42.9 |
HIP 114355 |
20.39 |
| 2026-05-21 12:00 |
23:09:07.58 |
-04:16:37.6 |
HIP 114355 |
20.24 |
| 2026-05-22 00:00 |
23:09:08.28 |
-04:16:32.5 |
HIP 114355 |
20.10 |
| 2026-05-22 12:00 |
23:09:08.95 |
-04:16:27.5 |
HIP 114355 |
19.96 |
| 2026-05-23 00:00 |
23:09:09.60 |
-04:16:22.7 |
HIP 114355 |
19.83 |
| 2026-05-23 12:00 |
23:09:10.23 |
-04:16:18.0 |
HIP 114355 |
19.71 |
| 2026-05-24 00:00 |
23:09:10.83 |
-04:16:13.5 |
HIP 114355 |
19.58 |
| 2026-05-24 12:00 |
23:09:11.41 |
-04:16:09.1 |
HIP 114355 |
19.47 |
| 2026-05-25 00:00 |
23:09:11.96 |
-04:16:04.9 |
HIP 114355 |
19.36 |
| 2026-05-25 12:00 |
23:09:12.49 |
-04:16:00.9 |
HIP 114355 |
19.25 |
| 2026-05-26 00:00 |
23:09:13.00 |
-04:15:56.9 |
HIP 114355 |
19.15 |
| 2026-05-26 12:00 |
23:09:13.48 |
-04:15:53.2 |
HIP 114355 |
19.05 |
| 2026-05-27 00:00 |
23:09:13.94 |
-04:15:49.6 |
HIP 114355 |
18.96 |
| 2026-05-27 12:00 |
23:09:14.37 |
-04:15:46.1 |
HIP 114355 |
18.87 |
| 2026-05-28 00:00 |
23:09:14.77 |
-04:15:42.8 |
HIP 114355 |
18.79 |
| 2026-05-28 12:00 |
23:09:15.16 |
-04:15:39.6 |
HIP 114355 |
18.71 |
| 2026-05-29 00:00 |
23:09:15.51 |
-04:15:36.6 |
HIP 114355 |
18.64 |
| 2026-05-29 12:00 |
23:09:15.85 |
-04:15:33.8 |
HIP 114355 |
18.57 |
| 2026-05-30 00:00 |
23:09:16.16 |
-04:15:31.1 |
HIP 114355 |
18.51 |
| 2026-05-30 12:00 |
23:09:16.44 |
-04:15:28.6 |
HIP 114355 |
18.45 |
| 2026-05-31 00:00 |
23:09:16.70 |
-04:15:26.2 |
HIP 114355 |
18.39 |
| 2026-05-31 12:00 |
23:09:16.93 |
-04:15:24.0 |
HIP 114355 |
18.34 |
| 2026-06-01 00:00 |
23:09:17.14 |
-04:15:21.9 |
HIP 114355 |
18.29 |
| 2026-06-01 12:00 |
23:09:17.32 |
-04:15:20.0 |
HIP 114355 |
18.25 |
| 2026-06-02 00:00 |
23:09:17.48 |
-04:15:18.2 |
HIP 114355 |
18.21 |