メタデータ
| 項目 |
値 |
| Designation |
C/2007 E2 (Lovejoy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-03-27T12:01:31.946880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:05Z |
| Obs used |
1648 |
| NEO |
- |
| M1 |
10.300 |
| K1 |
17.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2007-05-15.0000000 |
| e |
0.99917565 |
| q (au) |
1.092938 |
| a (au) |
1325.822845 |
| i (deg) |
95.882901 |
| Ω (om, deg) |
232.431837 |
| ω (w, deg) |
340.533777 |
| M (ma, deg) |
0.000990 |
等級
散乱 + 全体線形
$$
M_a = (14.262 + 3.304\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.262 |
| n |
3.304 |
| gf |
1.000 |
| gb |
-0.728 |
| 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 |
| 2007-03-27 |
2007-08-23 |
+7.4238 |
-2.181 |
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 |
02:47:54.92 |
+57:00:28.1 |
HIP 13160 |
10.91 |
| 2026-09-20 12:00 |
02:47:51.31 |
+57:00:40.8 |
HIP 13160 |
11.37 |
| 2026-09-21 00:00 |
02:47:47.67 |
+57:00:53.3 |
HIP 13160 |
11.84 |
| 2026-09-21 12:00 |
02:47:43.99 |
+57:01:05.5 |
HIP 13160 |
12.32 |
| 2026-09-22 00:00 |
02:47:40.28 |
+57:01:17.5 |
HIP 13160 |
12.81 |
| 2026-09-22 12:00 |
02:47:36.53 |
+57:01:29.2 |
HIP 13160 |
13.31 |
| 2026-09-23 00:00 |
02:47:32.76 |
+57:01:40.7 |
HIP 13160 |
13.82 |
| 2026-09-23 12:00 |
02:47:28.95 |
+57:01:52.0 |
HIP 13160 |
14.33 |
| 2026-09-24 00:00 |
02:47:25.10 |
+57:02:03.0 |
HIP 13160 |
14.85 |
| 2026-09-24 12:00 |
02:47:21.23 |
+57:02:13.8 |
HIP 13160 |
15.38 |
| 2026-09-25 00:00 |
02:47:17.32 |
+57:02:24.3 |
HIP 13160 |
15.92 |
| 2026-09-25 12:00 |
02:47:13.38 |
+57:02:34.6 |
HIP 13160 |
16.46 |
| 2026-09-26 00:00 |
02:47:09.41 |
+57:02:44.6 |
HIP 13160 |
17.00 |
| 2026-09-26 12:00 |
02:47:05.40 |
+57:02:54.3 |
HIP 13160 |
17.55 |
| 2026-09-27 00:00 |
02:47:01.37 |
+57:03:03.9 |
HIP 13160 |
18.11 |
| 2026-09-27 12:00 |
02:46:57.30 |
+57:03:13.1 |
HIP 13160 |
18.67 |
| 2026-09-28 00:00 |
02:46:53.21 |
+57:03:22.1 |
HIP 13160 |
19.24 |
| 2026-09-28 12:00 |
02:46:49.08 |
+57:03:30.8 |
HIP 13160 |
19.81 |
| 2026-09-29 00:00 |
02:46:44.93 |
+57:03:39.3 |
HIP 13160 |
20.38 |
| 2026-09-29 12:00 |
02:46:40.74 |
+57:03:47.5 |
HIP 13160 |
20.96 |
| 2026-09-30 00:00 |
02:46:36.53 |
+57:03:55.5 |
HIP 13160 |
21.54 |
| 2026-09-30 12:00 |
02:46:32.28 |
+57:04:03.2 |
HIP 13160 |
22.13 |
| 2026-10-01 00:00 |
02:46:28.01 |
+57:04:10.6 |
HIP 13160 |
22.72 |
| 2026-10-01 12:00 |
02:46:23.71 |
+57:04:17.8 |
HIP 13160 |
23.31 |
| 2026-10-02 00:00 |
02:46:19.38 |
+57:04:24.7 |
HIP 13160 |
23.91 |
| 2026-10-02 12:00 |
02:46:15.02 |
+57:04:31.3 |
HIP 13160 |
24.51 |
| 2026-10-03 00:00 |
02:46:10.63 |
+57:04:37.7 |
HIP 13160 |
25.11 |
| 2026-10-03 12:00 |
02:46:06.22 |
+57:04:43.8 |
HIP 13160 |
25.72 |
| 2026-10-04 00:00 |
02:46:01.78 |
+57:04:49.6 |
HIP 13160 |
26.33 |
| 2026-10-04 12:00 |
02:45:57.32 |
+57:04:55.2 |
HIP 13160 |
26.94 |
| 2026-10-05 00:00 |
02:45:52.82 |
+57:05:00.4 |
HIP 12676 |
26.86 |
| 2026-10-05 12:00 |
02:45:48.31 |
+57:05:05.4 |
HIP 12676 |
26.33 |
| 2026-10-06 00:00 |
02:45:43.76 |
+57:05:10.2 |
HIP 12676 |
25.80 |
| 2026-10-06 12:00 |
02:45:39.19 |
+57:05:14.6 |
HIP 12676 |
25.27 |
| 2026-10-07 00:00 |
02:45:34.60 |
+57:05:18.8 |
HIP 12676 |
24.74 |
| 2026-10-07 12:00 |
02:45:29.98 |
+57:05:22.7 |
HIP 12676 |
24.21 |
| 2026-10-08 00:00 |
02:45:25.34 |
+57:05:26.4 |
HIP 12676 |
23.67 |
| 2026-10-08 12:00 |
02:45:20.67 |
+57:05:29.7 |
HIP 12676 |
23.14 |
| 2026-10-09 00:00 |
02:45:15.98 |
+57:05:32.8 |
HIP 12676 |
22.61 |
| 2026-10-09 12:00 |
02:45:11.27 |
+57:05:35.5 |
HIP 12676 |
22.08 |
| 2026-10-10 00:00 |
02:45:06.53 |
+57:05:38.1 |
HIP 12676 |
21.55 |
| 2026-10-10 12:00 |
02:45:01.78 |
+57:05:40.3 |
HIP 12676 |
21.02 |
| 2026-10-11 00:00 |
02:44:57.00 |
+57:05:42.2 |
HIP 12676 |
20.50 |