HD 38529

Planetary System : HD 38529
Yellow Main Sequence Star

THE STAR
HR 1988, also called HD 38529, is a sixth magnitude (5.95) star in the constellation Orion. Too faint to have a proper or Greek letter name, it is known only by its number in the Bright Star(HR) and the Henry Draper (HD) Catalogues. Classed G4 and somewhat cooler than the Sun (5675 Kelvin), the star was originally catalogued as a dwarf (G4 V), but is now considered a subgiant (G4 IV). HR 1988's distance of 138 light years reveals a luminosity 6.5 times that of the Sun, placing it squarely in the subgiant realm, in which stars have either used up their internal hydrogen fuel or will soon begin to do so, the star's mass 1.4 times solar. Like so many of the stars that have orbiting planets, HR 1988 is metal-rich, its iron abundance estimated to be about 70% greater than the Sun's.

Location
Constellation:  Orion
Right Ascension:  05 46 34.9120
Declination:  +01 10 05.496
Distance from Sol:  138.39 Light Years
 
  Basic Data
Spectral Type:  G4
Apparent Magnitude:  5.94
Mass:  1.39 Solar Masses
Radius:  2.6 Solar Radii
Effective Temperature:  5800 Kelvin
Metallicity:  0.23 [Fe/H]
1.69 times Solar
Rotation:  34.5 days
 
Habitability
 
 
Inner Edge of Habitability Zone:  1.31 AU
Outer Edge of Habitability Zone:  4.09 AU
Estimated Stellar Lifespan  3723 million

System Components
(Mass in Multiples of Jupiter's Mass)

HD 38529 b
Epistellar Giant

Basic Data
Parent Star:  HD 38529 (G4)
Discovery Status:  Confirmed
Planet Type:  Hot Jupiter, Eccentric
 
Physical Data
Mass ( M sin i ):  0.67 Jupiters
Periastron Distance:  0.08 AU
Mean Distance:  0.12 AU
Apastron Distance:  0.15 AU
Orbital Period:  14.3007 Days
Eccentricity:  0.312
Argument of Perihelion (omega):  89.173°
Radial Velocity of Star:  52.448 m/s
 
 Inferred Propities
  Average Angular Size of Star:  11.525°
Planet Appearance:
 Blue and cloudless, faint red glow
Periastron Temp:  1407 Kelvin
Mean Temp:  1167 Kelvin
Apastron Temp:  1019 Kelvin
 
 Discovery Facts
 
Year Discovered:  2000
Detection Method:  Doppler Spectroscopy
Discovered By:  FISCHER D., MARCY G., BUTLER P., VOGT S., FRINK S. & APPS K.
 

HD 38529 c
Eccentric Giant

Basic Data
Parent Star:  HD 38529 (G4)
Discovery Status:  Confirmed
Planet Type:  Water Giant, Eccentric
Habitability:  Planet at outer edge of Habitable Zone at Mean Orbital Distance
 
  Physical Data
Mass ( M sin i ):  11.3 Jupiters
Periastron Distance:  2.31 AU
Mean Distance:  3.51 AU
Apastron Distance:  4.7 AU
Orbital Period:  2189.5284 Days
Eccentricity:  0.34
Argument of Perihelion (omega):  9.424°
Radial Velocity of Star:  167.66 m/s

Inferred Propities 
Average Angular Size of Star:  0.394°
Planet Appearance:
 Visible red glow, silicate and iron clouds possible
Periastron Temp:  265 Kelvin
Mean Temp:  215 Kelvin
Apastron Temp:  186 Kelvin
 
  Discovery Facts
 
Year Discovered:  13 Jun 2002
Detection Method:  Doppler Spectroscopy
Discovered By:  Fischer et al.

Planetary Orbits around HD 38529

Planet B : 0.12 AUs -----------   Planet C : 7.02 AUs

Position in Orion