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) |
| 2026-09-20 00:00 |
18:02:54.73 |
-11:16:17.4 |
HIP 88502 |
30.19 |
| 2026-09-20 12:00 |
18:02:54.61 |
-11:16:34.7 |
HIP 88502 |
30.42 |
| 2026-09-21 00:00 |
18:02:54.52 |
-11:16:52.1 |
HIP 88502 |
30.64 |
| 2026-09-21 12:00 |
18:02:54.47 |
-11:17:09.4 |
HIP 88502 |
30.86 |
| 2026-09-22 00:00 |
18:02:54.45 |
-11:17:26.7 |
HIP 88502 |
31.07 |
| 2026-09-22 12:00 |
18:02:54.48 |
-11:17:44.0 |
HIP 88502 |
31.28 |
| 2026-09-23 00:00 |
18:02:54.54 |
-11:18:01.3 |
HIP 88502 |
31.49 |
| 2026-09-23 12:00 |
18:02:54.64 |
-11:18:18.6 |
HIP 88502 |
31.68 |
| 2026-09-24 00:00 |
18:02:54.77 |
-11:18:35.8 |
HIP 88502 |
31.88 |
| 2026-09-24 12:00 |
18:02:54.95 |
-11:18:53.0 |
HIP 88502 |
32.07 |
| 2026-09-25 00:00 |
18:02:55.16 |
-11:19:10.3 |
HIP 88502 |
32.25 |
| 2026-09-25 12:00 |
18:02:55.41 |
-11:19:27.5 |
HIP 88502 |
32.43 |
| 2026-09-26 00:00 |
18:02:55.69 |
-11:19:44.6 |
HIP 88502 |
32.60 |
| 2026-09-26 12:00 |
18:02:56.01 |
-11:20:01.8 |
HIP 88502 |
32.78 |
| 2026-09-27 00:00 |
18:02:56.37 |
-11:20:19.0 |
HIP 88502 |
32.94 |
| 2026-09-27 12:00 |
18:02:56.77 |
-11:20:36.1 |
HIP 88502 |
33.10 |
| 2026-09-28 00:00 |
18:02:57.20 |
-11:20:53.2 |
HIP 88502 |
33.26 |
| 2026-09-28 12:00 |
18:02:57.67 |
-11:21:10.2 |
HIP 88502 |
33.42 |
| 2026-09-29 00:00 |
18:02:58.18 |
-11:21:27.3 |
HIP 88502 |
33.57 |
| 2026-09-29 12:00 |
18:02:58.72 |
-11:21:44.3 |
HIP 88502 |
33.72 |
| 2026-09-30 00:00 |
18:02:59.30 |
-11:22:01.3 |
HIP 88502 |
33.86 |
| 2026-09-30 12:00 |
18:02:59.92 |
-11:22:18.3 |
HIP 88502 |
34.00 |
| 2026-10-01 00:00 |
18:03:00.57 |
-11:22:35.2 |
HIP 88502 |
34.14 |
| 2026-10-01 12:00 |
18:03:01.26 |
-11:22:52.2 |
HIP 88502 |
34.27 |
| 2026-10-02 00:00 |
18:03:01.99 |
-11:23:09.1 |
HIP 88502 |
34.41 |
| 2026-10-02 12:00 |
18:03:02.75 |
-11:23:25.9 |
HIP 88502 |
34.54 |
| 2026-10-03 00:00 |
18:03:03.55 |
-11:23:42.7 |
HIP 88502 |
34.66 |
| 2026-10-03 12:00 |
18:03:04.39 |
-11:23:59.5 |
HIP 88502 |
34.79 |
| 2026-10-04 00:00 |
18:03:05.26 |
-11:24:16.3 |
HIP 88502 |
34.91 |
| 2026-10-04 12:00 |
18:03:06.17 |
-11:24:33.0 |
HIP 88502 |
35.03 |
| 2026-10-05 00:00 |
18:03:07.12 |
-11:24:49.7 |
HIP 88502 |
35.15 |
| 2026-10-05 12:00 |
18:03:08.10 |
-11:25:06.4 |
HIP 88502 |
35.27 |
| 2026-10-06 00:00 |
18:03:09.12 |
-11:25:23.0 |
HIP 88502 |
35.38 |
| 2026-10-06 12:00 |
18:03:10.18 |
-11:25:39.6 |
HIP 88502 |
35.50 |
| 2026-10-07 00:00 |
18:03:11.27 |
-11:25:56.1 |
HIP 88502 |
35.61 |
| 2026-10-07 12:00 |
18:03:12.39 |
-11:26:12.6 |
HIP 88502 |
35.72 |
| 2026-10-08 00:00 |
18:03:13.56 |
-11:26:29.1 |
HIP 88502 |
35.83 |
| 2026-10-08 12:00 |
18:03:14.75 |
-11:26:45.5 |
HIP 88502 |
35.94 |
| 2026-10-09 00:00 |
18:03:15.99 |
-11:27:01.8 |
HIP 88502 |
36.05 |
| 2026-10-09 12:00 |
18:03:17.26 |
-11:27:18.2 |
HIP 88502 |
36.16 |
| 2026-10-10 00:00 |
18:03:18.56 |
-11:27:34.5 |
HIP 88502 |
36.27 |
| 2026-10-10 12:00 |
18:03:19.90 |
-11:27:50.7 |
HIP 88502 |
36.38 |
| 2026-10-11 00:00 |
18:03:21.28 |
-11:28:06.9 |
HIP 88502 |
36.49 |