Alternate Names

Cygnus XR-1

Type

Stellar mass

Location

In the constellation Cygnus

Finder Chart

Distance

6,000 to 10,000 light-years

Mass

15 times the mass of the Sun

Size

Diameter 55 miles (90 km), equal to the size of a large American city

Discovery Methods

• Measuring the motions of gas

X-ray image of Cygnus X-1. [NASA/CXC]

This document was last modified: June 25, 2012.