Key parameters at a glance
- A radius of 12.80 Earth radii
- A mass of 1,739.47 Earth masses
- Surface gravity around 10.62 g
- An orbital period of 20,608.140 days
- Semi-major axis 13.3900 AU
- Distance from Earth 101.99 light-years
- Earth Similarity Index 0.435
- Travel time at Voyager 1 speed 1,798,616 years
HD 29985 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1063of 1771
top 60.0%
This planet
12.80R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 29985 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.80 | 11.21 |
| Mass (M⊕) | 1.00 | 1,739.47 | 317.83 |
| Density (g/cm³) | 5.51 | 4.56 | 1.33 |
| Surface Gravity (g) | 1.00 | 10.62 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,739.475 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 29985
HIP
HIP 21865
TIC
TIC 170867837
Gaia DR2
Gaia DR2 4868261081155110400
Gaia DR3
Gaia DR3 4868261081155110400
System
HD 29985
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 56.42 Earth years on a mildly elliptical path at a mean orbital distance of 13.3900 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.435
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
Feng et al. 2022Instrument
Multiple Instruments
Publication
2022-09
Observation locale
Ground
Discovery cohort
Planets confirmed in 2022 at Multiple Observatories (12 shown).
Host System: HD 29985
Spectral Class
K-type orange
Effective Temperature
4,678 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.575 R☉
Stellar Mass
0.750 M☉
Metallicity [Fe/H]
-0.22
Extended Stellar Properties
Surface gravity (log g)
4.794 dex
Stellar density
5.572 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 7 bands
Astrometric Data
Parallax
31.950 mas
Total Proper Motion
295.521 mas/yr
PM Right Ascension
-37.74 mas/yr
PM Declination
-293.10 mas/yr
Galactic Cartesian (pc)
x = 0.277 · y = 0.782 · z = -0.558
Equatorial (J2000)
RA 70.52166° · Dec -33.92107°
Galactic ℓ, b
235.700° · -40.504°
Ecliptic λ, β
60.830° · -55.405°
HTM-20 index
-368189536
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