Key parameters at a glance

A radius of 13.20 Earth radii
A mass of 813.64 Earth masses
Surface gravity around 4.67 g
An orbital period of 623.000 days
Semi-major axis 1.5100 AU
Distance from Earth 423.89 light-years
Earth Similarity Index 0.386
Travel time at Voyager 1 speed 7,475,333 years

HD 64121 b Planet Profile

Physical Specs

Radius

13.20 R⊕

Radius (Jupiter)

1.180 R♃

Mass

813.64 M⊕

Mass (Jupiter)

2.560 M♃

Density

1.94 g/cm³

Surface Gravity

4.67 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.386

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

#847of 1771

top 47.8%

This planet

13.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 c 13.20 R⊕ HD 37605 b 13.20 R⊕ MOA-2009-BLG-387L b 13.20 R⊕

Metric	Earth	HD 64121 b	Jupiter
Radius (R⊕)	1.00	13.20	11.21
Mass (M⊕)	1.00	813.64	317.83
Density (g/cm³)	5.51	1.94	1.33
Surface Gravity (g)	1.00	4.67	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	813.641 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 64121

TIC

TIC 264770836

Gaia DR2

Gaia DR2 5488303966125344512

Gaia DR3

Gaia DR3 5488303966125344512

System

HD 64121

Percentile among Gas Giant cohort

Radius 13.200 R⊕ · percentile 49 / cohort 1771

Mass 813.641 M⊕ · percentile 62 / cohort 1747

Orbital period 623.00 d · percentile 71 / cohort 1533

Distance 129.97 pc · percentile 40 / cohort 1759

ESI 0.386 · percentile 81 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

623.000 days

Semi-major axis

1.5100 AU

Eccentricity

0.110

Inclination

— °

Year Length

A year here lasts about 1.71 Earth years on a mildly elliptical path at a mean orbital distance of 1.5100 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.386

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Ottoni 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 22532 b · Gas Giant HD 29399 b · Gas Giant iot Dra c · Gas Giant HD 105779 b · Gas Giant

Host System: HD 64121

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,078 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

5.440 R☉

Stellar Mass

1.640 M☉

Metallicity [Fe/H]

-0.21

Distance

129.97 parsec

Light-years 423.89 ly

V-band magnitude

7.43 mag

Voyager-speed travel 7,475,333 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

7.666 mas

Total Proper Motion

75.308 mas/yr

PM Right Ascension

-2.16 mas/yr

PM Declination

-75.28 mas/yr

Galactic Cartesian (pc)

x = -0.265 · y = 0.512 · z = -0.817

Equatorial (J2000)

RA 117.36514° · Dec -54.81261°

Galactic ℓ, b

267.811° · -14.135°

Ecliptic λ, β

151.391° · -72.440°

HTM-20 index

-1414639103