Key parameters at a glance

A radius of 13.50 Earth radii
A mass of 498.99 Earth masses
Surface gravity around 2.74 g
An orbital period of 892.700 days
Semi-major axis 1.9130 AU
Distance from Earth 144.00 light-years
Earth Similarity Index 0.346
Travel time at Voyager 1 speed 2,539,506 years

HD 29399 b Planet Profile

Physical Specs

Radius

13.50 R⊕

Radius (Jupiter)

1.210 R♃

Mass

498.99 M⊕

Mass (Jupiter)

1.570 M♃

Density

1.11 g/cm³

Surface Gravity

2.74 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.346

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#671of 1771

top 37.8%

This planet

13.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 45350 b 13.50 R⊕ HD 82943 b 13.50 R⊕ HD 27442 b 13.50 R⊕

Metric	Earth	HD 29399 b	Jupiter
Radius (R⊕)	1.00	13.50	11.21
Mass (M⊕)	1.00	498.99	317.83
Density (g/cm³)	5.51	1.11	1.33
Surface Gravity (g)	1.00	2.74	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	498.991 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 29399

TIC

TIC 38828538

Gaia DR2

Gaia DR2 4675576135153914368

Gaia DR3

Gaia DR3 4675576135153914368

System

HD 29399

Percentile among Gas Giant cohort

Radius 13.500 R⊕ · percentile 59 / cohort 1771

Mass 498.991 M⊕ · percentile 49 / cohort 1747

Orbital period 892.70 d · percentile 75 / cohort 1533

Distance 44.15 pc · percentile 16 / cohort 1759

ESI 0.346 · percentile 70 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

892.700 days

Semi-major axis

1.9130 AU

Eccentricity

0.050

Inclination

— °

Year Length

A year here lasts about 2.44 Earth years on a nearly circular orbit at a mean orbital distance of 1.9130 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.346

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Pezzotti et al. 2022

Instrument

CORALIE Spectrograph

Publication

2022-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2022 at La Silla Observatory (12 shown).

TOI-500 c · Sub-Neptune pi Men d · Sub-Neptune TOI-500 e · Sub-Neptune CoRoT-7 d · Neptune-like TOI-500 d · Neptune-like HD 69123 b · Gas Giant HD 103891 b · Gas Giant HD 114082 b · Gas Giant HD 64121 b · Gas Giant HD 22532 b · Gas Giant iot Dra c · Gas Giant HD 105779 b · Gas Giant

Host System: HD 29399

Spectral Class

K-type orange

Effective Temperature

4,845 K — cooler than the Sun (5,778 K)

Estimated Age

6.20 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

4.500 R☉

Stellar Mass

1.170 M☉

Metallicity [Fe/H]

0.14

Distance

44.15 parsec

Light-years 144.00 ly

V-band magnitude

5.79 mag

Voyager-speed travel 2,539,506 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

22.620 mas

Total Proper Motion

119.109 mas/yr

PM Right Ascension

-117.64 mas/yr

PM Declination

-18.67 mas/yr

Galactic Cartesian (pc)

x = 0.168 · y = 0.425 · z = -0.890

Equatorial (J2000)

RA 68.39035° · Dec -62.82376°

Galactic ℓ, b

273.737° · -39.472°

Ecliptic λ, β

11.987° · -80.098°

HTM-20 index

708424364

Similar Worlds

Kepler-46 c

Gas Giant · K-type orange

Radius 13.50 R⊕ · 2,534.4 ly

HD 222076 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 297.3 ly

HD 128311 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 53.3 ly

BD+48 740 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 2,174.1 ly

HD 81688 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 279.6 ly

HD 47366 c

Gas Giant · K-type orange

Radius 13.50 R⊕ · 275.1 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries La Silla Observatory Mission K-type orange Hosts