Star profile

81 Ursae Majoris

3D likeness based on its real data · class A · ~8,500 K

What is 81 Ursae Majoris

81 Ursae Majoris is a white A0V main-sequence star about 299 light-years away in the Great Bear. It shines with nearly fifty times the Sun's luminosity and shows the bluish-white tone typical of young, hot A-type stars actively fusing hydrogen at their cores. Modest in apparent brightness, it shares the sky with the Plough —the figure that has guided sailors and walkers across the northern hemisphere for millennia.

Where it is and when to see it

81 Ursae Majoris lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is March, when it culminates around midnight.

From London it never sets and culminates about 86° up.
From New York it never sets and culminates about 75° up.
From Sydney it culminates about 1° above the horizon.

It can be seen from anywhere north of 35° S.

It ranks no. 75 in brightness among the 124 stars of Ursa Major in our catalogue. To find it, start from Alioth, the brightest: it lies about 6° away (a fist at arm's length covers about 10°).

The light you see today left it about 300 years ago.

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Astronomical data for 81 Ursae Majoris

Constellation: Ursa Major
Apparent magnitude: 5.60
Distance: 298.7 light years
Coordinates (J2000): RA 203.530° · Dec 55.348°
Catalogue: HIP 66198 · HD 118214

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Other stars in Ursa Major

Ursa Major has 124 stars in Stelvia's catalogue. Here are a few of them.

See all 124 stars in Ursa Major