We can easily point at V407 Cyg and 3c 454.3 at the same time.
我们能很容易地同时观测V407 Cyg和3c 454.3。
The location of this flaring active galaxy is very fortunate. It is about 38 deg away from a star known as V407 Cyg.
这个活跃的发光星系的位置是非常幸运的，距离被称为V407 Cyg(天鹅座- V407号星)的亮星约38度。
This paper is contributed to the study of the light curve and periodicity of the black hole X-ray binary Cyg X-1.
本文主要致力于黑x射线双星光变曲线以及周期性特征的研究。
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