Sunday, September 16, 2007

J. Herschel 5173 AB

Star type
g A: K3 V
g B: M3.5-4.0 V

Distance from Earth
g 19.74 ly

Star Service No.
g NA

g A: 10 by (may be an old disk star)
g B: Less than 1 Gyr

Diameter/Mass/Temp (xSol)
g A: 71%-80%; 82%; 4890 K
g B: 28%; 20%; NA

Brightness (xSol)
g A: 23%
g B: 0.0077%

g A: 85%
g B: 26%

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

Picture of star
g NA

Star system features
g Stars A and B separated by 43 AUs, which is just beyond the "average" orbital distance (semi-major axis) of Pluto in the Solar System
g Star system has two optical companions that are not gravitationally bound, which are themselves binary systems (Gl 783.1 A and B; and Gl 738.2 A and B).

Known planets
g A: None
g B: None; possibly Vega-like disk orbiting star

Habitable zone
g A: An Earth-type planet would be "comfortable" with liquid water is centered around only 0.48 AU, or between the orbital distances of Mercury and Venus in the Solar System. Such a planet would have an orbital period of about 134 days. Probability of habitable planet is 2%.
g B: An Earth-type planet would be centered around only 0.028 AU, where such a planet would complete an orbital period within 3.8 Earth days. Probability of habitable planet is less than 0.1%.

Orbital map
g NA

View from star
g See sky map

Nearby stars
(Star systems with 10 light years)
g CD-45 13677: 3.2 ly
g L 347-14: 4.5 ly
g CD-49 13515: 7.1 ly
g Hip 103039: 7.2 ly
g Lacaille 8760: 7.8 ly
g CD-27 14659: 9.8 ly
g CD-44 11909: 10 ly

Map locating star system
g See stellar map (listed as “CD-36 13940”)

Location in Earth sky
g Southeast corner of Constellation Sagittarius, the Archer, southeast of Theta1 and Theta2 Sagittarii

Other names
g A: HJ 5173 A
g A: HR 7703 A
g A: Gl 783 A
g A: LHS 486
g A: CP(D)-36 9037
g A: SAO 211885
g A: LTT 7988
g A: LFT 1529
g A-B: HD 19408 AB
g A-B: Hip 99461 AB
g A-B: LP 870-45 AB
g B: Gl 783 B
g B: CD-36 13940 B
g B: LHS 487
g B: LTT 7989
g B: LFT 1530
g B: HJ 5173 B

Sci-fi mentions
g NA

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