メタデータ
| 項目 |
値 |
| Designation |
C/2013 UQ4 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-07-05T23:01:47.953920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:42Z |
| Obs used |
1853 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
6.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-07-12.0000000 |
| e |
0.98215354 |
| q (au) |
1.080975 |
| a (au) |
60.570843 |
| i (deg) |
145.258572 |
| Ω (om, deg) |
317.662397 |
| ω (w, deg) |
23.312164 |
| M (ma, deg) |
0.012629 |
等級
散乱 + 全体線形
$$
M_a = (11.588 + 5.145\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.588 |
| n |
5.145 |
| gf |
0.800 |
| gb |
-0.748 |
| k |
0.800 |
| δ90 |
3.096 |
| 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 |
| 2014-05-07 |
2014-07-05 |
-2.4544 |
-0.050 |
| 2014-07-05 |
2014-08-12 |
+15.6290 |
-0.425 |
| 2014-08-12 |
2015-02-26 |
-4.0603 |
+1.408 |
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 |
09:00:14.40 |
+15:10:43.8 |
HIP 44174 |
5.86 |
| 2026-05-12 12:00 |
09:00:14.79 |
+15:10:42.0 |
HIP 44174 |
5.94 |
| 2026-05-13 00:00 |
09:00:15.21 |
+15:10:40.1 |
HIP 44174 |
6.03 |
| 2026-05-13 12:00 |
09:00:15.68 |
+15:10:38.1 |
HIP 44174 |
6.13 |
| 2026-05-14 00:00 |
09:00:16.18 |
+15:10:35.9 |
HIP 44174 |
6.24 |
| 2026-05-14 12:00 |
09:00:16.71 |
+15:10:33.5 |
HIP 44174 |
6.36 |
| 2026-05-15 00:00 |
09:00:17.29 |
+15:10:31.0 |
HIP 44174 |
6.49 |
| 2026-05-15 12:00 |
09:00:17.89 |
+15:10:28.3 |
HIP 44174 |
6.62 |
| 2026-05-16 00:00 |
09:00:18.54 |
+15:10:25.5 |
HIP 44174 |
6.76 |
| 2026-05-16 12:00 |
09:00:19.22 |
+15:10:22.5 |
HIP 44174 |
6.92 |
| 2026-05-17 00:00 |
09:00:19.93 |
+15:10:19.4 |
HIP 44174 |
7.08 |
| 2026-05-17 12:00 |
09:00:20.68 |
+15:10:16.1 |
HIP 44174 |
7.25 |
| 2026-05-18 00:00 |
09:00:21.47 |
+15:10:12.6 |
HIP 44174 |
7.43 |
| 2026-05-18 12:00 |
09:00:22.29 |
+15:10:09.0 |
HIP 44174 |
7.62 |
| 2026-05-19 00:00 |
09:00:23.15 |
+15:10:05.2 |
HIP 44174 |
7.81 |
| 2026-05-19 12:00 |
09:00:24.04 |
+15:10:01.3 |
HIP 44174 |
8.02 |
| 2026-05-20 00:00 |
09:00:24.96 |
+15:09:57.2 |
HIP 44174 |
8.24 |
| 2026-05-20 12:00 |
09:00:25.92 |
+15:09:53.0 |
HIP 44174 |
8.46 |
| 2026-05-21 00:00 |
09:00:26.92 |
+15:09:48.6 |
HIP 44174 |
8.70 |
| 2026-05-21 12:00 |
09:00:27.95 |
+15:09:44.1 |
HIP 44174 |
8.94 |
| 2026-05-22 00:00 |
09:00:29.01 |
+15:09:39.4 |
HIP 44174 |
9.19 |
| 2026-05-22 12:00 |
09:00:30.11 |
+15:09:34.6 |
HIP 44174 |
9.45 |
| 2026-05-23 00:00 |
09:00:31.24 |
+15:09:29.6 |
HIP 44174 |
9.72 |
| 2026-05-23 12:00 |
09:00:32.40 |
+15:09:24.5 |
HIP 44174 |
10.00 |
| 2026-05-24 00:00 |
09:00:33.60 |
+15:09:19.2 |
HIP 44174 |
10.29 |
| 2026-05-24 12:00 |
09:00:34.83 |
+15:09:13.8 |
HIP 44174 |
10.58 |
| 2026-05-25 00:00 |
09:00:36.09 |
+15:09:08.3 |
HIP 44174 |
10.89 |
| 2026-05-25 12:00 |
09:00:37.39 |
+15:09:02.5 |
HIP 44174 |
11.20 |
| 2026-05-26 00:00 |
09:00:38.72 |
+15:08:56.7 |
HIP 44174 |
11.53 |
| 2026-05-26 12:00 |
09:00:40.08 |
+15:08:50.7 |
HIP 44295 |
11.52 |
| 2026-05-27 00:00 |
09:00:41.48 |
+15:08:44.5 |
HIP 44295 |
11.33 |
| 2026-05-27 12:00 |
09:00:42.91 |
+15:08:38.2 |
HIP 44295 |
11.13 |
| 2026-05-28 00:00 |
09:00:44.37 |
+15:08:31.8 |
HIP 44295 |
10.95 |
| 2026-05-28 12:00 |
09:00:45.86 |
+15:08:25.2 |
HIP 44295 |
10.76 |
| 2026-05-29 00:00 |
09:00:47.38 |
+15:08:18.5 |
HIP 44295 |
10.58 |
| 2026-05-29 12:00 |
09:00:48.94 |
+15:08:11.6 |
HIP 44295 |
10.42 |
| 2026-05-30 00:00 |
09:00:50.52 |
+15:08:04.6 |
HIP 44313 |
10.10 |
| 2026-05-30 12:00 |
09:00:52.14 |
+15:07:57.4 |
HIP 44313 |
9.78 |
| 2026-05-31 00:00 |
09:00:53.79 |
+15:07:50.1 |
HIP 44313 |
9.46 |
| 2026-05-31 12:00 |
09:00:55.47 |
+15:07:42.7 |
HIP 44313 |
9.14 |
| 2026-06-01 00:00 |
09:00:57.18 |
+15:07:35.1 |
HIP 44313 |
8.82 |
| 2026-06-01 12:00 |
09:00:58.92 |
+15:07:27.4 |
HIP 44313 |
8.51 |
| 2026-06-02 00:00 |
09:01:00.69 |
+15:07:19.6 |
HIP 44313 |
8.21 |