Type

Stellar mass

Location

In the constellation Ursa Major

Finder Chart

Distance

6,000 light-years

Mass

7 times the mass of the Sun

Size

Diameter 26 miles (42 km), equal to the size of a large city.

Discovery Methods

• Measuring the motions of stars
• Measuring X-rays

The X-ray spectrum of XTE J1118+480 recorded by Chandra X-Ray Observatory in 2000. [NASA/CfA/J.McClintock & M.Garcia]

This document was last modified: November 7, 2005.