Alternate Names

Mayall II

Type

Intermediate mass

Location

near the Andromeda galaxy (M31)

Finder Chart

Distance

2.3 million light-years (0.76 megaparsecs)

Mass

14,000 to 23,000 times the mass of the Sun

Size

52,000-86,000 miles (84,000-138,000 km), roughly equivalent to the diameter of Jupiter

Discovery Methods

• Measuring the motions of stars

1

This illustration shows the position of G1 relative to the Andromeda galaxy. M32 and NGC 205 are satellite galaxies of Andromeda, and both appear to contain supermassive black holes at their cores. [NASA, Palomar Observatory/Z. Levay (STScI)]

This document was last modified: January 19, 2006.