In addition, uncertainties in the distance to the binary system would also influence mass calculations. All of these uncertainties can make a case for Cyg X-1 having only 3 solar masses, which would point to it being a neutron star.

• 此外，双子系统的距离不确定性同样也会影响质量的计算，所有这些不确定性可能会使大鹅座X－l的质量只有3个太阳那么大，这样它就是一颗中子星。