Monday, July 30, 2007

Wolf 424 AB

Star type
g A: M5.5 J
g B: M7

Distance from Earth
g 14.3 ly

Star Service No.
g NA

g A: NA
g B: NA

Diameter/Mass/Temp (xSol)
g A: 17%; 14%; NA
g B: 13%; 14%; NA

Brightness (xSol)
g A: 14/100,000th (If Sun were replaced by Wolf 424 A, an observer on Earth would need a telescope to see its round shape clearly, and daylight would be very dim with not much more than ten times the brightness of full moonlight with Sol)
g B: 8/100,000th

g NA

Comparison to Sol
g See illustration

Picture of star
g See picture

Star system features
g Wolf 424 B may be one of the most active (UV-Ceti type) flare stars known

Known planets
g None

Habitable zone
g A: To be warmed sufficiently by star light to have liquid water, about 0.01 AU and a 1.3-day orbital period
g B: To be warmed sufficiently by star light to have liquid water, about 0.009 AU and a 1.2-day orbital period

Orbital map
g stars are separated "on average" by only 3.1 times the Earth-Sun distance of an orbital semi-major axis (a= 0.715 +/-0.04"). However, the pair travel in an eccentric orbit (e= 0.28) around each other, and so their separation actually varies between 2.6 and 4.2 AUs in an orbit that takes 16.2 years to complete. See map

View from star
g NA

Nearby stars
(Star systems with 10 light years)
g Ross 128, 4 ly
g EE Leonis, 7.2 ly
g Lalande 25372, 7.2 ly
g G 12-30, 7.3 ly
g Wolf 359, 7.3 ly
g LP 731-58, 7.4 ly
g AD Leonis, 8.1 ly
g LP 378-541, 8.4 ly
g BD+44 2051 AB, 9.7 ly

Map locating star system
g See stellar map

Location in Earth sky
g North central part of Constellation Virgo, the Maiden, south of Vindemiatrix (Epsilon Virginis) and north of Auva (Delta Virginis); not visible to the naked eye, either combined or individually

Other names
g A: Gl 473 A
g A: G 12-43
g A: G 60-14
g A: LHS 333
g A: LTT 13546
g A: LFT 923
g B: FL Virginis
g B: Gl 473 B
g B: G 236-65 B
g B: LHS 333 B

Sci-fi mentions
g The Arrival (1996), film: Wolf 424 is the point of origin of an invading alien race
g Location of Babel in "Star Trek" franchise

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