HD 38529

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Template:Short description

HD 38529 A/B
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Orion[1]
HD 38529 A
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) +5.95[3]
HD 38529 B
Right ascension Template:RA[4]
Declination Template:DEC[4]
Apparent magnitude (V) +13.35[5]
Characteristics
Spectral type G4IV[3] / M3.0V[5]
B−V Template:Engvar 0.773[3] / 0.46Script error: No such module "Unsubst".
Astrometry
HD 38529 A
Radial velocity (Rv)Template:Val[2] km/s
Proper motion (μ) RA: Template:Val mas/yr[2]
Dec.: Template:Val mas/yr[2]
Parallax (π)23.5714±0.0422 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+2.81[3]
HD 38529 B
Radial velocity (Rv)Template:Val[4] km/s
Proper motion (μ) RA: Template:Val mas/yr[4]
Dec.: Template:Val mas/yr[4]
Parallax (π)23.7139±0.0168 mas[4]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+10.23Script error: No such module "Unsubst".
Details
HD 38529 A
Mass1.479±0.037[6] Template:Solar mass
Radius2.678±0.026[6] Template:Solar radius
Luminosity6.16±0.15[6] Template:Solar luminosity
Surface gravity (log g)Template:Val[7] cgs
TemperatureTemplate:Val[7] K
Metallicity [Fe/H]Template:Val[7] dex
RotationTemplate:Val[7]
Rotational velocity (v sin i)Template:Val[7] km/s
Age3.07±0.39[6] Gyr
HD 38529 B
Mass0.494[8] Template:Solar mass
Radius0.496[8] Template:Solar radius
Luminosity0.033[8] Template:Solar luminosity
Surface gravity (log g)4.74[8] cgs
Temperature3,487[8] K
Metallicity [Fe/H]0.39[9] dex
Rotational velocity (v sin i)17[9] km/s
Other designations
Template:Odlist[10]
HD 38529 A: Template:Odlist[11]
HD 38529 B: Template:Odlist[12]
Database references
SIMBADA
B
Exoplanet Archivedata

Script error: No such module "Check for unknown parameters".

HD 38529 (138 G. Orionis)[13] is a binary star system approximately 138 light-years away in the constellation of Orion.

HD 38529 A

HD 38529 A is a yellow subgiant star of spectral type G4IV,[14] though it has also been classified as a main sequence dwarf of type G4V[5] and a borderline giant star of type G8III/IV.[15] It is about 48% more massive than the Sun.[6]

Two substellar companions are known in orbit around this star, including one with a mass near the deuterium fusion limit that is often used as the dividing line between giant planets and brown dwarfs. There is a debris disk located at least 86 astronomical units from the star.[16] Its orbit is probably mildly misaligned with the planetary orbits, by 21−45°.[17]

Planetary system

In 2001, the planet HD 38529 b was discovered orbiting the star HD 38529 A by Debra Fischer and collaborators who detected it using the Doppler spectroscopy technique.[14] It has a mass at least 78% that of Jupiter and orbits very close to the star, just beyond the distance limit for hot Jupiters. It does not transit the star.[7]

In 2003, a massive superjovian HD 38529 c was found orbiting at 3.68 AU with a minimum mass of 12.7 Jupiter masses.[3] Astrometric measurements from the Hipparcos satellite gave a best fit inclination of 160° and a true mass 37 times that of Jupiter, turning this planet into a brown dwarf.[18]

Further study of the system using Hubble Space Telescope astrometry revised the mass of HD 38529 c downwards to 17.7 Jupiter masses and suggested the presence of an additional planet, orbiting in the gap between HD 38529 b and c.[19] The possible third planet was refuted after additional radial velocity measurements were collected.[7] Subsequent astrometric studies have found masses for HD 38529 c ranging from just Template:Jupiter mass[20] to Template:Jupiter mass,[17] with the most recent value as of 2025 being Template:Jupiter mass.[21]

Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:OrbitboxPlanet Template:OrbitboxPlanet disk Template:Orbitbox end

HD 38529 B

HD 38529 B is a common proper motion stellar companion to HD 38529 A at a projected distance of about ~12000 astronomical units. The star is a red dwarf of spectral type M3.0V.[5] Wide binary stars such as HD 38529 AB have been shown to be vulnerable to disruption by galactic tides and perturbations by passing stars.[22]

See also

Notes

Template:Notelist

References

Template:Reflist

External links

Template:Sky

Template:Stars of Orion

  1. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named constellation
  2. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Gaia DR3 A
  3. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Fischer2003
  4. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Gaia DR3 B
  5. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Raghavan2006
  6. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Ball2020
  7. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Henry2013
  8. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named tic
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named veyette2017
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Simbad
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Simbad for A
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Simbad for B
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Gould1879
  14. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Fischer2001
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Houk1999
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Hillenbrand2008
  17. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Xuan2020
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Reffert2006
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Benedict2010
  20. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Feng2022
  21. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Feng2025
  22. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Correa-Otto2017
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