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) |
| 2026-09-20 00:00 |
15:57:41.45 |
+31:15:40.7 |
HIP 78164 |
17.47 |
| 2026-09-20 12:00 |
15:57:43.25 |
+31:15:04.9 |
HIP 78164 |
18.09 |
| 2026-09-21 00:00 |
15:57:45.08 |
+31:14:29.2 |
HIP 78164 |
18.70 |
| 2026-09-21 12:00 |
15:57:46.94 |
+31:13:53.6 |
HIP 78164 |
19.32 |
| 2026-09-22 00:00 |
15:57:48.82 |
+31:13:18.1 |
HIP 78164 |
19.95 |
| 2026-09-22 12:00 |
15:57:50.73 |
+31:12:42.7 |
HIP 78061 |
20.40 |
| 2026-09-23 00:00 |
15:57:52.67 |
+31:12:07.5 |
HIP 78061 |
20.84 |
| 2026-09-23 12:00 |
15:57:54.63 |
+31:11:32.3 |
HIP 78061 |
21.30 |
| 2026-09-24 00:00 |
15:57:56.62 |
+31:10:57.3 |
HIP 78061 |
21.78 |
| 2026-09-24 12:00 |
15:57:58.64 |
+31:10:22.4 |
HIP 78061 |
22.28 |
| 2026-09-25 00:00 |
15:58:00.69 |
+31:09:47.6 |
HIP 78061 |
22.80 |
| 2026-09-25 12:00 |
15:58:02.76 |
+31:09:13.0 |
HIP 78257 |
23.25 |
| 2026-09-26 00:00 |
15:58:04.85 |
+31:08:38.4 |
HIP 78257 |
22.56 |
| 2026-09-26 12:00 |
15:58:06.98 |
+31:08:04.0 |
HIP 78257 |
21.86 |
| 2026-09-27 00:00 |
15:58:09.12 |
+31:07:29.8 |
HIP 78257 |
21.17 |
| 2026-09-27 12:00 |
15:58:11.30 |
+31:06:55.7 |
HIP 78257 |
20.48 |
| 2026-09-28 00:00 |
15:58:13.50 |
+31:06:21.7 |
HIP 78257 |
19.80 |
| 2026-09-28 12:00 |
15:58:15.72 |
+31:05:47.8 |
HIP 78257 |
19.12 |
| 2026-09-29 00:00 |
15:58:17.98 |
+31:05:14.1 |
HIP 78257 |
18.44 |
| 2026-09-29 12:00 |
15:58:20.25 |
+31:04:40.5 |
HIP 78257 |
17.77 |
| 2026-09-30 00:00 |
15:58:22.55 |
+31:04:07.1 |
HIP 78257 |
17.11 |
| 2026-09-30 12:00 |
15:58:24.88 |
+31:03:33.9 |
HIP 78257 |
16.46 |
| 2026-10-01 00:00 |
15:58:27.23 |
+31:03:00.7 |
HIP 78257 |
15.82 |
| 2026-10-01 12:00 |
15:58:29.61 |
+31:02:27.8 |
HIP 78257 |
15.18 |
| 2026-10-02 00:00 |
15:58:32.01 |
+31:01:55.0 |
HIP 78257 |
14.56 |
| 2026-10-02 12:00 |
15:58:34.43 |
+31:01:22.3 |
HIP 78257 |
13.96 |
| 2026-10-03 00:00 |
15:58:36.88 |
+31:00:49.8 |
HIP 78257 |
13.37 |
| 2026-10-03 12:00 |
15:58:39.35 |
+31:00:17.5 |
HIP 78257 |
12.80 |
| 2026-10-04 00:00 |
15:58:41.85 |
+30:59:45.3 |
HIP 78257 |
12.26 |
| 2026-10-04 12:00 |
15:58:44.37 |
+30:59:13.3 |
HIP 78257 |
11.74 |
| 2026-10-05 00:00 |
15:58:46.92 |
+30:58:41.5 |
HIP 78257 |
11.26 |
| 2026-10-05 12:00 |
15:58:49.49 |
+30:58:09.8 |
HIP 78257 |
10.80 |
| 2026-10-06 00:00 |
15:58:52.08 |
+30:57:38.4 |
HIP 78257 |
10.39 |
| 2026-10-06 12:00 |
15:58:54.69 |
+30:57:07.0 |
HIP 78257 |
10.03 |
| 2026-10-07 00:00 |
15:58:57.33 |
+30:56:35.9 |
HIP 78257 |
9.72 |
| 2026-10-07 12:00 |
15:59:00.00 |
+30:56:05.0 |
HIP 78257 |
9.46 |
| 2026-10-08 00:00 |
15:59:02.68 |
+30:55:34.2 |
HIP 78257 |
9.26 |
| 2026-10-08 12:00 |
15:59:05.38 |
+30:55:03.6 |
HIP 78257 |
9.14 |
| 2026-10-09 00:00 |
15:59:08.11 |
+30:54:33.3 |
HIP 78257 |
9.08 |
| 2026-10-09 12:00 |
15:59:10.86 |
+30:54:03.1 |
HIP 78257 |
9.09 |
| 2026-10-10 00:00 |
15:59:13.64 |
+30:53:33.1 |
HIP 78257 |
9.18 |
| 2026-10-10 12:00 |
15:59:16.43 |
+30:53:03.3 |
HIP 78257 |
9.33 |
| 2026-10-11 00:00 |
15:59:19.25 |
+30:52:33.7 |
HIP 78257 |
9.55 |