Key parameters at a glance
- A radius of 12.50 Earth radii
- A mass of 3,299.06 Earth masses
- Surface gravity around 21.11 g
- An orbital period of 2,127.606 days
- Semi-major axis 3.2260 AU
- Distance from Earth 138.14 light-years
- Earth Similarity Index 0.379
- Travel time at Voyager 1 speed 2,436,089 years
1 sibling around HD 38529
HD 38529 c 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 | Gas Giant | 14.10 | 206.59 | 14.310 | — | 2000 |
| HD 38529 c this | Gas Giant | 12.50 | 3,299.06 | 2,127.606 | — | 2000 |
HD 38529 c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1235of 1771
top 69.7%
This planet
12.50R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 38529 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.50 | 11.21 |
| Mass (M⊕) | 1.00 | 3,299.06 | 317.83 |
| Density (g/cm³) | 5.51 | 9.28 | 1.33 |
| Surface Gravity (g) | 1.00 | 21.11 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 3,299.059 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 4,198.513 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
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
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 5.83 Earth years on a highly eccentric trajectory at a mean orbital distance of 3.2260 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
171.084 m/s
Transit mid-time (BJD)
2,454,612.6000
Long. of periastron (ω)
21.04°
Angular separation (arcsec)
76.20000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.379
0 = alien, 1 = Earth-identical
Detection Signatures
Radial velocity
Stellar wobble has been measured spectroscopically.
Astrometry
Positional wobble of the host star was measured.
Discovery Paper
Primary reference
Fischer et al. 2001Instrument
Multiple Instruments
Publication
2001-04
Observation locale
Ground
Discovery cohort
Planets confirmed in 2000 at Multiple Observatories (5 shown).
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]
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
1
RV measurements
11
Stellar spectra
2
Archive notes
2
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