Monday, September 17, 2007

82 Eridani

Star type
g G5V

Distance from Earth
g 19.77 ly

Star Service No.
g NA

g More than 10 billion years old (as indicated by low metallicity and high space velocity, and its substantial galactic orbital eccentricity, though it does appear to have a slight overabundance of metals for its age)

Diameter/Mass/Temp (xSol)
g 92%; 97%; 5305 K

Brightness (xSol)
g 60%

g 29%-100%; metal poor

Comparison to Sol
g See chart (virtually identical in size to Sun)

Picture of star
g NA

Star system features
g Past spectroscopic analysis suggested that the star may have a dim companion in a close orbit, but no study presenting empirical data for evaluating that indication is available

Known planets
g None

Habitable zone
g An Earth-type planet would be "comfortable" with liquid water is centered around 0.80 AU, midway between the orbital distances of Venus and Earth in the Solar System. At that distance from the star, such a planet would have an orbital period of almost 275 days. Probability of a habitable planet is 5.7%.

Orbital map
g NA

View from star
g See sky map

Nearby stars
(Star systems with 10 light years)
g LP 944-20 (brown dwarf): 4.4 ly
g GJ 1061: 7.9 ly
g L 302-89: 8.1 ly
g Kapteyn's Star: 8.9 ly

Map locating star system
g See stellar map (listed as “82 Eri”)

Location in Earth sky
g Southern part of Constellation Eridanus, the River, southeast of Acamar (Theta1 Eridani)

Other names
g GJ 139, HD 20794, Hip 15510, LHS 19, e Eridani, e Eri, 82 Eri, HR 1008, CD-43 1028, CP(D)-43 354, SAO 216263, FK5 119, LTT 1583, LFT 277, GC 4000, YPC 703.00

Sci-fi mentions
g Planet around star has gravity slightly higher than Earth's in Robert Silverberg novel "The Man in the Maze"
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