Epsilon Ursae Majoris

Aliothε UMaAlliothε UMa (Alioth)ε Ursae Majorisε Ursae Majoris A
Epsilon Ursae Majoris (Latinised from ε Ursae Majoris, abbreviated Epsilon UMa, ε UMa), officially named Alioth, is, despite being designated "ε" (epsilon), the brightest star in the constellation of Ursa Major, and at magnitude 1.77 is the thirty-second brightest star in the sky.wikipedia
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Ursa Major

Great BearOrsa MaggioreUrsa Major constellation
Epsilon Ursae Majoris (Latinised from ε Ursae Majoris, abbreviated Epsilon UMa, ε UMa), officially named Alioth, is, despite being designated "ε" (epsilon), the brightest star in the constellation of Ursa Major, and at magnitude 1.77 is the thirty-second brightest star in the sky.

Ursa Major Moving Group

Ursa Major StreamCollinder 285Ursa Major association
It is also a member of the large and diffuse Ursa Major moving group.

List of brightest stars

brightest starsbrightest starone of the brightest stars
Epsilon Ursae Majoris (Latinised from ε Ursae Majoris, abbreviated Epsilon UMa, ε UMa), officially named Alioth, is, despite being designated "ε" (epsilon), the brightest star in the constellation of Ursa Major, and at magnitude 1.77 is the thirty-second brightest star in the sky.

Big Dipper

Northern DipperThe PloughPlough
It is the star in the tail of the bear closest to its body, and thus the star in the handle of the Big Dipper (or Plough) closest to the bowl.

List of selected stars for navigation

navigational starsnavigation star150 stars
Historically, the star was frequently used in celestial navigation in the maritime trade, because it is listed as one of the 57 navigational stars.

Chinese star names

Chinese nameChinese uranographyTraditional Chinese star names
Consequently, the Chinese name for Epsilon Ursae Majoris itself is 北斗五 (Běi Dǒu wu, the Fifth Star of Northern Dipper) and 玉衡 (Yù Héng, Star of Jade Sighting-Tube).

USS Allioth

USS ''Allioth'' (AK-109)Allioth'' (IX-204)USS ''Allioth'' (AVS-4)
USS Allioth (AK-109) was a United States Navy Crater class cargo ship named after the star.
USS Allioth (AK-109/IX-204/AVS-4) was a commissioned by the US Navy for service in World War II, named after Alioth, a star in constellation Ursa Major.

Saptarishi

SaptarshiSeven Rishisseven sages
This star was known to the Hindus as Añgiras, one of the Seven Rishis.

Latinisation of names

LatinizedLatinisedlatinisation
Epsilon Ursae Majoris (Latinised from ε Ursae Majoris, abbreviated Epsilon UMa, ε UMa), officially named Alioth, is, despite being designated "ε" (epsilon), the brightest star in the constellation of Ursa Major, and at magnitude 1.77 is the thirty-second brightest star in the sky.

Epsilon

ΕEGreek letter Epsilon
Epsilon Ursae Majoris (Latinised from ε Ursae Majoris, abbreviated Epsilon UMa, ε UMa), officially named Alioth, is, despite being designated "ε" (epsilon), the brightest star in the constellation of Ursa Major, and at magnitude 1.77 is the thirty-second brightest star in the sky.

Star

starsstellarmassive star
Epsilon Ursae Majoris (Latinised from ε Ursae Majoris, abbreviated Epsilon UMa, ε UMa), officially named Alioth, is, despite being designated "ε" (epsilon), the brightest star in the constellation of Ursa Major, and at magnitude 1.77 is the thirty-second brightest star in the sky.

Constellation

constellationsEuropean constellationModern constellation
Epsilon Ursae Majoris (Latinised from ε Ursae Majoris, abbreviated Epsilon UMa, ε UMa), officially named Alioth, is, despite being designated "ε" (epsilon), the brightest star in the constellation of Ursa Major, and at magnitude 1.77 is the thirty-second brightest star in the sky.

Apparent magnitude

apparent visual magnitudemagnitudevisual magnitude
Epsilon Ursae Majoris (Latinised from ε Ursae Majoris, abbreviated Epsilon UMa, ε UMa), officially named Alioth, is, despite being designated "ε" (epsilon), the brightest star in the constellation of Ursa Major, and at magnitude 1.77 is the thirty-second brightest star in the sky.

Celestial navigation

astronavigationnavigationcelestial
Historically, the star was frequently used in celestial navigation in the maritime trade, because it is listed as one of the 57 navigational stars.

Hipparcos

HIPHipparcos CatalogueHipparcos satellite
According to Hipparcos, Epsilon Ursae Majoris is 81 ly from the Sun.

Sun

solarSolThe Sun
According to Hipparcos, Epsilon Ursae Majoris is 81 ly from the Sun.

Stellar classification

spectral typeK-typeG-type
Its spectral type is A1p; the "p" stands for peculiar, as its spectrum is characteristic of an α 2 Canum Venaticorum variable.

Ap and Bp stars

Ap starBp starsilicon star
Its spectral type is A1p; the "p" stands for peculiar, as its spectrum is characteristic of an α 2 Canum Venaticorum variable.

Chemically peculiar star

chemically peculiarpeculiar starpeculiar
Its spectral type is A1p; the "p" stands for peculiar, as its spectrum is characteristic of an α 2 Canum Venaticorum variable.

Astronomical spectroscopy

spectrumspectroscopicspectra
Its spectral type is A1p; the "p" stands for peculiar, as its spectrum is characteristic of an α 2 Canum Venaticorum variable.

Alpha2 Canum Venaticorum variable

α 2 CVn variableα² CVn variableAlpha 2 Canum Venaticorum variable
Its spectral type is A1p; the "p" stands for peculiar, as its spectrum is characteristic of an α 2 Canum Venaticorum variable.

Magnetic field

magnetic fieldsmagneticmagnetic flux density
First, the star's strong magnetic field separating different elements in the star's hydrogen 'fuel'.

Hydrogen

HH 2 hydrogen gas
First, the star's strong magnetic field separating different elements in the star's hydrogen 'fuel'.

Spectral line

emission lineabsorption linelines
The intervening elements react differently at different frequencies of light as they whip in and out of view, causing Epsilon Ursae Majoris to have very strange spectral lines that fluctuate over a period of 5.1 days.

Calcium

CaCa 2+ calcium ions
The kB9 suffix to the spectral type indicates that the calcium K line is present and representative of a B9 spectral type even though the rest of the spectrum indicates A1.