XO-3

XO-3 is a star away in the constellation Camelopardalis. The star has a magnitude of 10 and is not visible to the naked eye but is visible through a small telescope. A search for a binary companion star using adaptive optics at the MMT Observatory was negative.

Planetary system

In 2007 the gas giant exoplanet XO-3b was discovered by the XO Telescope using the transit method. This object may be classed as a brown dwarf because of its high mass, near the limit for deuterium fusion. The planetary orbit is misaligned from the stellar rotation.