Key parameters at a glance

A radius of 12.80 Earth radii
A mass of 1,609.80 Earth masses
Surface gravity around 9.83 g
An orbital period of 1,752.921 days
Semi-major axis 2.9050 AU
Equilibrium temperature 203 K (-70 °C)
Distance from Earth 278.52 light-years
Earth Similarity Index 0.409
Travel time at Voyager 1 speed 4,911,722 years

HD 80869 b Planet Profile

Physical Specs

Radius

12.80 R⊕

Radius (Jupiter)

1.150 R♃

Mass

1,609.80 M⊕

Mass (Jupiter)

5.065 M♃

Density

4.22 g/cm³

Surface Gravity

9.83 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.409

HZ Position Outer

Controversial No

Discovery

Year 2021

Method Radial Velocity

Facility Haute-Provence Observatory

Telescope 1.93 m Telescope

Size rank in cohort

Rank by radius

#1063of 1771

top 60.0%

This planet

12.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 240210 b 12.80 R⊕ HD 29985 b 12.80 R⊕ HD 148164 c 12.80 R⊕

Metric	Earth	HD 80869 b	Jupiter
Radius (R⊕)	1.00	12.80	11.21
Mass (M⊕)	1.00	1,609.80	317.83
Density (g/cm³)	5.51	4.22	1.33
Surface Gravity (g)	1.00	9.83	2.53
Insolation (S⊕)	1.00	0.14	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,609.801 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	1,544.646 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 80869

HIP

HIP 46022

TIC

TIC 307906761

Gaia DR2

Gaia DR2 702119851729696640

Gaia DR3

Gaia DR3 702119851729696640

System

HD 80869

Percentile among Gas Giant cohort

Radius 12.800 R⊕ · percentile 37 / cohort 1771

Mass 1,609.801 M⊕ · percentile 75 / cohort 1747

Orbital period 1,752.92 d · percentile 83 / cohort 1533

Distance 85.40 pc · percentile 32 / cohort 1759

ESI 0.409 · percentile 88 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,752.921 days

Semi-major axis

2.9050 AU

Eccentricity

0.924

Inclination

98.56 °

Year Length

A year here lasts about 4.80 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.9050 AU.

Extended Orbital Architecture

Semi-major axis / stellar radius

583.000

RV semi-amplitude (K)

210.967 m/s

Long. of periastron (ω)

76.70°

Angular separation (arcsec)

34.00000

Eq. Temperature

203K

(-70 °C)

Insolation (S⊕)

0.14

Earth = 1.00

Earth Similarity (ESI)

0.409

0 = alien, 1 = Earth-identical

Beyond the outer HZ boundary (too cold) — surface water would be frozen.

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

Discovery Paper

Primary reference

Demangeon et al. 2021

Instrument

SOPHIE Spectrograph

Publication

2021-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at Haute-Provence Observatory (11 shown).

HD 27969 b · Gas Giant HD 109286 b · Gas Giant HD 211403 b · Gas Giant BD+63 1405 b · Gas Giant HD 331093 b · Gas Giant BD+45 564 b · Gas Giant HD 95544 b · Gas Giant HD 115954 b · Gas Giant HD 124330 b · Gas Giant HD 155193 b · Gas Giant BD+55 362 b · Gas Giant

Host System: HD 80869

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,837 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.062 R☉

Stellar Mass

1.060 M☉

Metallicity [Fe/H]

0.17

Extended Stellar Properties

Surface gravity (log g)

4.180 dex

Stellar density

0.419 g/cm³

Rotational v·sin i

3.70 km/s

Metallicity ratio

[Fe/H]

Distance

85.40 parsec

Light-years 278.52 ly

V-band magnitude

8.48 mag

Voyager-speed travel 4,911,722 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

11.682 mas

Total Proper Motion

136.254 mas/yr

PM Right Ascension

70.88 mas/yr

PM Declination

-116.37 mas/yr

Galactic Cartesian (pc)

x = -0.643 · y = 0.525 · z = 0.558

Equatorial (J2000)

RA 140.79129° · Dec 33.90483°

Galactic ℓ, b

190.983° · 45.107°

Ecliptic λ, β

132.438° · 17.643°

HTM-20 index

-2035130809