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Black Holes Encyclopedia
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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

Image

Cygnus X-1

This gamma-ray image from the Integral satellite shows Cygnus X-1 (the large white blob at center) and Cygnus X-3, which is an accretion disk encircling a neutron star. [ESA]

This document was last modified: November 7, 2005.