Key parameters at a glance

A radius of 14.10 Earth radii
A mass of 206.59 Earth masses
Surface gravity around 1.04 g
An orbital period of 14.310 days
Semi-major axis 0.1150 AU
Distance from Earth 138.14 light-years
Earth Similarity Index 0.273
Travel time at Voyager 1 speed 2,436,089 years

1 sibling around HD 38529

HD 38529 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 38529 b this	Gas Giant	14.10	206.59	14.310	—	2000
HD 38529 c	Gas Giant	12.50	3,299.06	2,127.606	—	2000

HD 38529 b Planet Profile

Physical Specs

Radius

14.10 R⊕

Radius (Jupiter)

1.250 R♃

Mass

206.59 M⊕

Mass (Jupiter)

0.650 M♃

Density

0.41 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.273

HZ Position Unknown

Controversial No

Discovery

Year 2000

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#371of 1771

top 20.9%

This planet

14.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 27894 b 14.10 R⊕ HD 103720 b 14.10 R⊕ HD 216770 b 14.10 R⊕

Metric	Earth	HD 38529 b	Jupiter
Radius (R⊕)	1.00	14.10	11.21
Mass (M⊕)	1.00	206.59	317.83
Density (g/cm³)	5.51	0.41	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	206.588 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 38529

HIP

HIP 27253

TIC

TIC 200093173

Gaia DR2

Gaia DR2 3219847066672970368

Gaia DR3

Gaia DR3 3219847066672970368

System

HD 38529

Percentile among Gas Giant cohort

Radius 14.100 R⊕ · percentile 77 / cohort 1771

Mass 206.588 M⊕ · percentile 21 / cohort 1747

Orbital period 14.31 d · percentile 46 / cohort 1533

Distance 42.35 pc · percentile 15 / cohort 1759

ESI 0.273 · percentile 50 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

14.310 days

Semi-major axis

0.1150 AU

Eccentricity

0.256

Inclination

— °

Year Length

A year here lasts approximately 14.31 Earth days (3.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1150 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

56.993 m/s

Transit mid-time (BJD)

2,455,200.3000

Long. of periastron (ω)

95.25°

Angular separation (arcsec)

2.72000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.273

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Fischer et al. 2001

Instrument

Multiple Instruments

Publication

2001-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2000 at Multiple Observatories (5 shown).

HD 92788 b · Gas Giant HD 12661 b · Gas Giant HD 38529 c · Gas Giant GJ 876 c · Gas Giant eps Eri b · Gas Giant

Host System: HD 38529

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,697 K — cooler than the Sun (5,778 K)

Estimated Age

4.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

2.858 R☉

Stellar Mass

0.980 M☉

Metallicity [Fe/H]

0.51

Extended Stellar Properties

Surface gravity (log g)

3.709 dex

Stellar density

0.061 g/cm³

Systemic radial velocity

30.27 km/s

Rotational v·sin i

3.20 km/s

Rotation period

37.00 days

Activity index (log R'HK)

-4.960

Metallicity ratio

[Fe/H]

Distance

42.35 parsec

Light-years 138.14 ly

V-band magnitude

5.93 mag

Voyager-speed travel 2,436,089 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

23.582 mas

Total Proper Motion

161.842 mas/yr

PM Right Ascension

-77.67 mas/yr

PM Declination

-141.99 mas/yr

Galactic Cartesian (pc)

x = 0.059 · y = 0.998 · z = 0.020

Equatorial (J2000)

RA 86.64514° · Dec 1.16759°

Galactic ℓ, b

204.318° · -13.838°

Ecliptic λ, β

86.372° · -22.230°

HTM-20 index

-1289137797

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes