Alpha Coronae Borealis AB

Star type
g A: A0 V
g B: G5

Distance from Earth
g 74.7 ly

Star Service No.
g NA

Age
g A: 3.14 billion years
g B: 3.14 billion years

Radius/Mass/Temp (xSol)
g A: 289%-304%; 260%; 9,700 K
g B: 90%; 92%; 5,800 K

Brightness (xSol)
g A: 270%
g B: 81%

Metallicity
g A: NA
g B: NA

Comparison to Sol
g A: NA
g B: NA

Picture of star
g A: NA
g B: NA

Star system features
g Stars orbit about each other in an eccentric orbit one every 17.36 days
g Believed to be a member of the Ursa Major Moving Group of stars that have a common motion through space

Known planets
g A: An excess of infrared radiation at 24 μm and 70 μm has been detected about Star A. This suggests the presence of a large disc of dust and material around Star A, prompting speculation of a planetary or proto-planetary system similar to that currently assumed around Vega. How the binary-star dynamic would affect such a system is the subject of intense debate.
g B: NA

Habitable zones
g A: NA
g B: Given close orbit of Star A, a habitable world is highly unlikely

Orbital map
g A: NA
g B: NA

View from stars
g NA

Nearby stars
(Star systems with 10 light years)
g NA

Map locating star system
g NA

Location in Earth sky
g In constellation Corona Borealis (see sky map)

Other names
g A: α CrB, α Coronae Borealis, Alphecca (Alphekka), Gemma, Gnosia (Gnosia Stella Coronae), and Asteroth (Ashtaroth), Corona Australis, Alphekka Meridiana, nayyir al-fakka, Nir al Feccah, Guàn Suǒ sì, The Jewel, 5 CrB, HR 5793, BD +27°2512, HD 139006, GCTP 3519.00, SAO 83893, FK5 578, HIP 76267, Alp CrB A, HR 5793, Alphecca A
g B: NA

Sci-fi mentions
g A: In “Star Trek” universe, in Federation space
g B: In “Star Trek” universe, in Federation space

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