メタデータ
| 項目 |
値 |
| Designation |
C/2014 Q2 (Lovejoy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-01-30T01:39:43.165440Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T14:42:53Z |
| Obs used |
7892 |
| NEO |
- |
| M1 |
9.800 |
| K1 |
4.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-03-30.0000000 |
| e |
0.99777385 |
| q (au) |
1.290358 |
| a (au) |
579.637230 |
| i (deg) |
80.301302 |
| Ω (om, deg) |
94.975059 |
| ω (w, deg) |
12.395262 |
| M (ma, deg) |
0.004162 |
等級
散乱 + 全体線形
$$
M_a = (9.166 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.166 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.870 |
| δ90 |
1.000 |
| 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 |
| 2014-07-01 |
2015-01-30 |
+10.9131 |
-2.182 |
| 2015-01-30 |
2016-09-10 |
+4.9291 |
-3.119 |
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 |
18:17:13.94 |
-10:37:13.2 |
HIP 89589 |
10.81 |
| 2026-05-12 12:00 |
18:17:10.66 |
-10:37:08.5 |
HIP 89589 |
10.41 |
| 2026-05-13 00:00 |
18:17:07.35 |
-10:37:03.9 |
HIP 89589 |
10.06 |
| 2026-05-13 12:00 |
18:17:04.01 |
-10:36:59.4 |
HIP 89589 |
9.76 |
| 2026-05-14 00:00 |
18:17:00.64 |
-10:36:55.0 |
HIP 89589 |
9.52 |
| 2026-05-14 12:00 |
18:16:57.25 |
-10:36:50.7 |
HIP 89589 |
9.36 |
| 2026-05-15 00:00 |
18:16:53.83 |
-10:36:46.5 |
HIP 89589 |
9.27 |
| 2026-05-15 12:00 |
18:16:50.39 |
-10:36:42.4 |
HIP 89589 |
9.25 |
| 2026-05-16 00:00 |
18:16:46.92 |
-10:36:38.4 |
HIP 89589 |
9.32 |
| 2026-05-16 12:00 |
18:16:43.43 |
-10:36:34.5 |
HIP 89589 |
9.47 |
| 2026-05-17 00:00 |
18:16:39.91 |
-10:36:30.8 |
HIP 89589 |
9.70 |
| 2026-05-17 12:00 |
18:16:36.36 |
-10:36:27.1 |
HIP 89589 |
10.00 |
| 2026-05-18 00:00 |
18:16:32.79 |
-10:36:23.5 |
HIP 89589 |
10.37 |
| 2026-05-18 12:00 |
18:16:29.20 |
-10:36:20.1 |
HIP 89589 |
10.81 |
| 2026-05-19 00:00 |
18:16:25.58 |
-10:36:16.7 |
HIP 89589 |
11.30 |
| 2026-05-19 12:00 |
18:16:21.94 |
-10:36:13.5 |
HIP 89589 |
11.84 |
| 2026-05-20 00:00 |
18:16:18.27 |
-10:36:10.4 |
HIP 89589 |
12.43 |
| 2026-05-20 12:00 |
18:16:14.59 |
-10:36:07.4 |
HIP 89589 |
13.07 |
| 2026-05-21 00:00 |
18:16:10.87 |
-10:36:04.5 |
HIP 89589 |
13.74 |
| 2026-05-21 12:00 |
18:16:07.14 |
-10:36:01.7 |
HIP 89589 |
14.44 |
| 2026-05-22 00:00 |
18:16:03.39 |
-10:35:59.0 |
HIP 89589 |
15.17 |
| 2026-05-22 12:00 |
18:15:59.61 |
-10:35:56.4 |
HIP 89589 |
15.92 |
| 2026-05-23 00:00 |
18:15:55.81 |
-10:35:54.0 |
HIP 89589 |
16.70 |
| 2026-05-23 12:00 |
18:15:51.99 |
-10:35:51.6 |
HIP 89589 |
17.50 |
| 2026-05-24 00:00 |
18:15:48.15 |
-10:35:49.4 |
HIP 89589 |
18.32 |
| 2026-05-24 12:00 |
18:15:44.29 |
-10:35:47.3 |
HIP 89589 |
19.15 |
| 2026-05-25 00:00 |
18:15:40.41 |
-10:35:45.3 |
HIP 89377 |
19.72 |
| 2026-05-25 12:00 |
18:15:36.51 |
-10:35:43.4 |
HIP 89377 |
18.80 |
| 2026-05-26 00:00 |
18:15:32.60 |
-10:35:41.6 |
HIP 89377 |
17.88 |
| 2026-05-26 12:00 |
18:15:28.66 |
-10:35:40.0 |
HIP 89377 |
16.96 |
| 2026-05-27 00:00 |
18:15:24.70 |
-10:35:38.4 |
HIP 89377 |
16.04 |
| 2026-05-27 12:00 |
18:15:20.72 |
-10:35:37.0 |
HIP 89377 |
15.13 |
| 2026-05-28 00:00 |
18:15:16.73 |
-10:35:35.7 |
HIP 89377 |
14.22 |
| 2026-05-28 12:00 |
18:15:12.72 |
-10:35:34.5 |
HIP 89377 |
13.31 |
| 2026-05-29 00:00 |
18:15:08.69 |
-10:35:33.4 |
HIP 89377 |
12.41 |
| 2026-05-29 12:00 |
18:15:04.64 |
-10:35:32.4 |
HIP 89377 |
11.52 |
| 2026-05-30 00:00 |
18:15:00.57 |
-10:35:31.5 |
HIP 89377 |
10.64 |
| 2026-05-30 12:00 |
18:14:56.49 |
-10:35:30.8 |
HIP 89377 |
9.79 |
| 2026-05-31 00:00 |
18:14:52.39 |
-10:35:30.2 |
HIP 89377 |
8.96 |
| 2026-05-31 12:00 |
18:14:48.28 |
-10:35:29.7 |
HIP 89377 |
8.16 |
| 2026-06-01 00:00 |
18:14:44.15 |
-10:35:29.3 |
HIP 89377 |
7.41 |
| 2026-06-01 12:00 |
18:14:40.01 |
-10:35:29.0 |
HIP 89377 |
6.73 |
| 2026-06-02 00:00 |
18:14:35.84 |
-10:35:28.9 |
HIP 89377 |
6.14 |