Beta Ursae Minoris
Sign in to saveAlso known as Kochab, 7 Ursae Minoris, The Emperor, 7 UMi, β Ursa Minoris, β UMi, HIP 72607, HIC 72607
Kochab , Bayer designation Beta Ursae Minoris (β Ursae Minoris, abbreviated β UMi, Beta UMi), is the brightest star in the bowl of the Little Dipper asterism (which is part of the constellation of Ursa Minor), and only slightly fainter than Polaris, the northern pole star and brightest star in Ursa Minor. Kochab is 16 degrees from Polaris and has an apparent visual magnitude of 2.08. The distance to this star from the Sun can be deduced from the parallax measurements made during the Hipparcos mission, yielding a value of .
Wikidata facts
- Part of
- Northern Pole
- Constellation
- Ursa Minor
- Distance from Earth
- 40.14
- Radius
- 42.06
- Mass
- 1.4
- Image
- Ursa Minor constellation map.png
Show 16 more facts
- spectral class
- K5
- catalog code
- UBV M 20451
- stellar rotational velocity
- 17
- apparent magnitude
- -1.39
- right ascension
- 222.676357498
- declination
- 74.155503937
- effective temperature
- 4126
- parallax
- 25.79
- radial velocity
- 18.3
- epoch
- J2000.0
- metallicity
- -0.24
- surface gravity
- 51
- luminosity
- 500
- right ascension component of proper motion
- -32
- declination component of proper motion
- 7
- age estimated by a dating method
- 2.95
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Encyclopedic overview
5 sectionsContents
- Nomenclature
- Properties
- As the pole star
- Planetary system
- References
Kochab , Bayer designation Beta Ursae Minoris (β Ursae Minoris, abbreviated β UMi, Beta UMi), is the brightest star in the bowl of the Little Dipper asterism (which is part of the constellation of Ursa Minor), and only slightly fainter than Polaris, the northern pole star and brightest star in Ursa Minor. Kochab is 16 degrees from Polaris and has an apparent visual magnitude of 2.08. The distance to this star from the Sun can be deduced from the parallax measurements made during the Hipparcos mission, yielding a value of .
Amateur astronomers can use Kochab as a precise guide for equatorial mount alignment: The celestial north pole is located 38 arcminutes away from Polaris, very close to the line connecting Polaris with Kochab.
Excerpted from Wikipedia’s “Beta Ursae Minoris” article, available under the CC BY-SA 4.0 licence.