メタデータ
| 項目 |
値 |
| Designation |
C/2007 K5 (Lovejoy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-05-01T23:02:06.720000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:09Z |
| Obs used |
48 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2007-06-15.0000000 |
| e |
0.97669348 |
| q (au) |
1.149171 |
| a (au) |
49.306854 |
| i (deg) |
64.883215 |
| Ω (om, deg) |
193.738734 |
| ω (w, deg) |
255.585000 |
| M (ma, deg) |
0.125370 |
等級
散乱 + 全体線形
$$
M_a = (13.220 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.220 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
15:57:23.08 |
+32:19:48.0 |
HIP 78161 |
5.58 |
| 2026-07-29 12:00 |
15:57:21.62 |
+32:19:16.3 |
HIP 78161 |
6.19 |
| 2026-07-30 00:00 |
15:57:20.19 |
+32:18:44.3 |
HIP 78161 |
6.81 |
| 2026-07-30 12:00 |
15:57:18.79 |
+32:18:12.2 |
HIP 78161 |
7.42 |
| 2026-07-31 00:00 |
15:57:17.43 |
+32:17:39.9 |
HIP 78161 |
8.03 |
| 2026-07-31 12:00 |
15:57:16.09 |
+32:17:07.4 |
HIP 78161 |
8.64 |
| 2026-08-01 00:00 |
15:57:14.78 |
+32:16:34.8 |
HIP 78161 |
9.25 |
| 2026-08-01 12:00 |
15:57:13.50 |
+32:16:02.0 |
HIP 78161 |
9.85 |
| 2026-08-02 00:00 |
15:57:12.25 |
+32:15:29.1 |
HIP 78161 |
10.46 |
| 2026-08-02 12:00 |
15:57:11.03 |
+32:14:55.9 |
HIP 78161 |
11.07 |
| 2026-08-03 00:00 |
15:57:09.84 |
+32:14:22.7 |
HIP 78161 |
11.67 |
| 2026-08-03 12:00 |
15:57:08.68 |
+32:13:49.2 |
HIP 78161 |
12.28 |
| 2026-08-04 00:00 |
15:57:07.56 |
+32:13:15.7 |
HIP 78161 |
12.88 |
| 2026-08-04 12:00 |
15:57:06.46 |
+32:12:41.9 |
HIP 78161 |
13.49 |
| 2026-08-05 00:00 |
15:57:05.39 |
+32:12:08.1 |
HIP 78161 |
14.09 |
| 2026-08-05 12:00 |
15:57:04.36 |
+32:11:34.0 |
HIP 78161 |
14.70 |
| 2026-08-06 00:00 |
15:57:03.35 |
+32:10:59.9 |
HIP 78161 |
15.30 |
| 2026-08-06 12:00 |
15:57:02.38 |
+32:10:25.6 |
HIP 78161 |
15.90 |
| 2026-08-07 00:00 |
15:57:01.44 |
+32:09:51.1 |
HIP 78161 |
16.50 |
| 2026-08-07 12:00 |
15:57:00.53 |
+32:09:16.5 |
HIP 78161 |
17.10 |
| 2026-08-08 00:00 |
15:56:59.65 |
+32:08:41.8 |
HIP 78161 |
17.70 |
| 2026-08-08 12:00 |
15:56:58.80 |
+32:08:07.0 |
HIP 78161 |
18.30 |
| 2026-08-09 00:00 |
15:56:57.98 |
+32:07:32.0 |
HIP 78161 |
18.90 |
| 2026-08-09 12:00 |
15:56:57.19 |
+32:06:56.9 |
HIP 78161 |
19.50 |
| 2026-08-10 00:00 |
15:56:56.44 |
+32:06:21.7 |
HIP 78161 |
20.10 |
| 2026-08-10 12:00 |
15:56:55.72 |
+32:05:46.3 |
HIP 78161 |
20.70 |
| 2026-08-11 00:00 |
15:56:55.02 |
+32:05:10.9 |
HIP 78161 |
21.30 |
| 2026-08-11 12:00 |
15:56:54.36 |
+32:04:35.3 |
HIP 78161 |
21.90 |
| 2026-08-12 00:00 |
15:56:53.74 |
+32:03:59.6 |
HIP 78161 |
22.49 |
| 2026-08-12 12:00 |
15:56:53.14 |
+32:03:23.8 |
HIP 78161 |
23.09 |
| 2026-08-13 00:00 |
15:56:52.57 |
+32:02:47.9 |
HIP 78161 |
23.69 |
| 2026-08-13 12:00 |
15:56:52.04 |
+32:02:11.9 |
HIP 78161 |
24.28 |
| 2026-08-14 00:00 |
15:56:51.54 |
+32:01:35.8 |
HIP 78161 |
24.88 |
| 2026-08-14 12:00 |
15:56:51.07 |
+32:00:59.6 |
HIP 78161 |
25.47 |
| 2026-08-15 00:00 |
15:56:50.63 |
+32:00:23.3 |
HIP 78161 |
26.07 |
| 2026-08-15 12:00 |
15:56:50.23 |
+31:59:47.0 |
HIP 78161 |
26.66 |
| 2026-08-16 00:00 |
15:56:49.85 |
+31:59:10.5 |
HIP 78161 |
27.26 |
| 2026-08-16 12:00 |
15:56:49.51 |
+31:58:33.9 |
HIP 78164 |
27.53 |
| 2026-08-17 00:00 |
15:56:49.20 |
+31:57:57.3 |
HIP 78164 |
26.99 |
| 2026-08-17 12:00 |
15:56:48.92 |
+31:57:20.6 |
HIP 78164 |
26.46 |
| 2026-08-18 00:00 |
15:56:48.68 |
+31:56:43.8 |
HIP 78164 |
25.92 |
| 2026-08-18 12:00 |
15:56:48.47 |
+31:56:06.9 |
HIP 78164 |
25.38 |
| 2026-08-19 00:00 |
15:56:48.28 |
+31:55:30.0 |
HIP 78164 |
24.84 |