When is the best time to observe Merak?

Merak is best observed from February through April, with peak visibility during March when it transits around midnight in the Northern Hemisphere.

Where is Merak located in the sky?

Merak lies in the constellation Ursa Major at right ascension 11h 02m and declination +56° 23′.

What telescope do I need to see Merak?

At magnitude 2.4, Merak is visible to the naked eye under most conditions.

Merak — Star in Ursa Major

Beta UMa

Magnitude 2.4^m Star Ursa Major (UMa) Visible

Star Map + List + Plan

About Merak

Description

Merak is a white main-sequence star of spectral type A1V at magnitude 2.37, located about 79 light-years from Earth. Together with Dubhe (Alpha UMa), Merak forms the famous 'Pointer Stars' of the Big Dipper that point toward Polaris. Merak has a luminosity of about 63 times solar and a surface temperature of around 9,400 K. An infrared excess detected around Merak suggests it may have a debris disk.

Observing Tips

Merak is the lower-right star of the Big Dipper's bowl (when the Dipper is upright). The line from Merak through Dubhe, extended about five times their separation, points directly to Polaris — this is the most famous direction-finding trick in amateur astronomy. Merak is visible year-round from mid-northern latitudes. Best evening viewing is from March through August.

History

The name Merak comes from the Arabic 'al-maraqq,' meaning 'the loin' or 'the flank' of the Great Bear. Merak is one of the five stars of the Big Dipper that belong to the Ursa Major Moving Group — a group of stars with common motion through space, suggesting they formed together about 300 million years ago.

Fun Facts

Merak's debris disk, detected by IRAS and confirmed by Spitzer, makes it similar to Vega and Fomalhaut — all are A-type stars with surrounding dust that may indicate planetary system formation. The Pointer Stars trick using Merak and Dubhe has been used for navigation for millennia and remains the first skill taught to beginning stargazers.