Monday, September 24, 2007

GJ 338 AB

Star type
g A: M0.0
g B: K7.0

Distance from Earth
g 20.18 ly

Star Service No.
g NA

g A: NA
g B: NA

Diameter/Mass/Temp (xSol)
g A: 67.5%; 35.9%; NA
g B: 65%; 60%-73%; NA

Brightness (xSol)
g A: 2.78% (an orange-red dwarf star similar to but much dimmer and redder than Epsilon Eridani; a flare star as well)
g B: 3.02%

g A: NA
g B: NA

Comparison to Sol
g A: See chart (similar to Proxima)
g B: NA

Picture of star
g A: NA
g B: NA

Star system features
g Stars A and B are separated on average by 108 AUs (16.675" of a semi-major axis using an NSTARS' average of 21.11 ly) in an eccentric orbit (e= 0.28) that takes 975 years to complete

Known planets
g A: Once suspected of having an unseen companion
g B: NA

Habitable zone
g A: Distance where an Earth-type planet would be "comfortable" with liquid water is centered around only 0.175 AU - well inside Mercury's orbital distance in the Solar System; at that distance from the star, such a planet would have an orbital period of about 34.5 days, just over a third of an Earth year.
g B: Water-zone orbital distance would be 0.17 AU with a period of about 30 days

Orbital map
g See animation

View from star
g NA

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

Map locating star system
g NA

Location in Earth sky
g Inthe southwestern corner of Constellation Ursa Major, the Great Bear, which also encompasses the Big Dipper or Plow (Plough), west of Theta Ursae Majoris and north of Talitha (Iota Ursae Majoris) and Kappa Ursae Majoris

Other names
g A-B: Struve 1321 AB; Sigma 1321 AB
g A: NS 0914+5241 A; LHS 260; G 195-017; HIP 45343; HD 79210; BD+53 1320; LFT 634; LTT 12425; HD 79210; SAO 27178; Vys/McC 541 A; STF 1321 A; ADS 7251 A
g B: LHS 261; BD+53 1321 ; LFT 635; Hip 120005; HD 79211; G 195-18; SAO 27179; LTT 12426; Vys/McC 541 B; STF 1321 B; ADS 7251 B

Sci-fi mentions
g NA

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