Monday, April 27, 2009

Beta Aquilae AB

Star type
g A: G8 IV
g B: M3 V

Distance from Earth
g 44.7 ly

Star Service No.
g NA

g A: Its subgiant status and that it is overly bright for its temperature show that it has stopped fusing hydrogen in its core, and with a dead helium core is preparing to become a much more luminous giant star; Sol will reach such a stage in about seven billion years, while Beta Aquilae A has a hydrogen-fusing lifetime only about 80% solar.
g B: NA

Radius/Mass/Temp (xSol)
g A: 300%; 130%; 5300 K
g B: NA; 33%; 3400 K

Brightness (xSol)
g A: 533%
g B: 2.5% (which is 10 times brighter than Proxima Centauri)

g A: NA
g B: NA

Comparison to Sol
g A: Magnetic field slightly stronger than that of the Sun, and displays some solar-like activity
g B: NA

Picture of star
g A: NA
g B: NA

Star system features
g Star B orbits Star a at 175 AU

Known planets
g A: Its motions have been examined for the effects of planets, but none have been found. Neither has any surrounding dust disk that might indicate a planetary system.
g B: NA

Habitable zones
g A: NA
g B: NA

Orbital map
g A: NA
g B: NA

View from stars
g A: Star B would shine only about as brightly as our quarter Moon as seen from Alshain A (or from some undetected close-in planet).

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

Map locating star system
g NA

Location in Earth sky
g In constellation Aquila

Other names
g A: Alshain
g B: NA

Sci-fi mentions
g A: In "Star Trek" universe, located in Federation space
g B: NA

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