Key parameters at a glance

A radius of 13.20 Earth radii
A mass of 950.31 Earth masses
Surface gravity around 5.45 g
An orbital period of 520.100 days
Semi-major axis 1.2590 AU
Equilibrium temperature 259 K (-14 °C)
Distance from Earth 180.74 light-years
Earth Similarity Index 0.463
Travel time at Voyager 1 speed 3,187,373 years

HD 109286 b Planet Profile

Physical Specs

Radius

13.20 R⊕

Radius (Jupiter)

1.170 R♃

Mass

950.31 M⊕

Mass (Jupiter)

2.990 M♃

Density

2.27 g/cm³

Surface Gravity

5.45 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.463

HZ Position Habitable

Controversial No

Discovery

Year 2021

Method Radial Velocity

Facility Haute-Provence Observatory

Telescope 1.93 m 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 109286 b	Jupiter
Radius (R⊕)	1.00	13.20	11.21
Mass (M⊕)	1.00	950.31	317.83
Density (g/cm³)	5.51	2.27	1.33
Surface Gravity (g)	1.00	5.45	2.53
Insolation (S⊕)	1.00	0.71	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	950.307 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 109286

HIP

HIP 61298

TIC

TIC 399087153

Gaia DR2

Gaia DR2 3902370696320119296

Gaia DR3

Gaia DR3 3902370696320119296

System

HD 109286

Percentile among Gas Giant cohort

Radius 13.200 R⊕ · percentile 49 / cohort 1771

Mass 950.307 M⊕ · percentile 66 / cohort 1747

Orbital period 520.10 d · percentile 68 / cohort 1533

Distance 55.42 pc · percentile 23 / cohort 1759

ESI 0.463 · percentile 100 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

520.100 days

Semi-major axis

1.2590 AU

Eccentricity

0.338

Inclination

— °

Year Length

A year here lasts about 1.42 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.2590 AU.

Extended Orbital Architecture

Semi-major axis / stellar radius

248.500

RV semi-amplitude (K)

81.600 m/s

Long. of periastron (ω)

133.10°

Angular separation (arcsec)

22.70000

Eq. Temperature

259K

(-14 °C)

Insolation (S⊕)

0.71

Earth = 1.00

Earth Similarity (ESI)

0.463

0 = alien, 1 = Earth-identical

Within the conservative habitable zone — surface water would be frozen.

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 211403 b · Gas Giant HD 80869 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 109286

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,694 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.089 R☉

Stellar Mass

0.980 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.440 dex

Stellar density

1.703 g/cm³

Rotational v·sin i

3.80 km/s

Metallicity ratio

[Fe/H]

Distance

55.42 parsec

Light-years 180.74 ly

V-band magnitude

8.78 mag

Voyager-speed travel 3,187,373 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

18.017 mas

Total Proper Motion

12.268 mas/yr

PM Right Ascension

12.17 mas/yr

PM Declination

-1.55 mas/yr

Galactic Cartesian (pc)

x = -0.981 · y = -0.145 · z = 0.127

Equatorial (J2000)

RA 188.39584° · Dec 7.28091°

Galactic ℓ, b

290.072° · 69.706°

Ecliptic λ, β

184.800° · 10.014°

HTM-20 index

-185198849