Key parameters at a glance

A radius of 14.30 Earth radii
A mass of 143.02 Earth masses
Surface gravity around 0.70 g
An orbital period of 1,628.000 days
Semi-major axis 2.7300 AU
Equilibrium temperature 176 K (-97 °C)
Distance from Earth 149.00 light-years
Earth Similarity Index 0.237
Travel time at Voyager 1 speed 2,627,577 years

1 sibling around HD 86226

HD 86226 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 86226 c	Sub-Neptune	2.16	7.25	3.984	1,311	2020
HD 86226 b this	Gas Giant	14.30	143.02	1,628.000	176	2009

HD 86226 b Planet Profile

Physical Specs

Radius

14.30 R⊕

Radius (Jupiter)

1.280 R♃

Mass

143.02 M⊕

Mass (Jupiter)

0.450 M♃

Density

0.27 g/cm³

Surface Gravity

0.70 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.237

HZ Position Unknown

Controversial No

Discovery

Year 2009

Method Radial Velocity

Facility Las Campanas Observatory

Telescope 6.5 m Magellan II Clay Telescope

Size rank in cohort

Rank by radius

#301of 1771

top 16.9%

This planet

14.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HIP 65407 b 14.30 R⊕ HD 30669 b 14.30 R⊕ HD 45652 b 14.30 R⊕

Metric	Earth	HD 86226 b	Jupiter
Radius (R⊕)	1.00	14.30	11.21
Mass (M⊕)	1.00	143.02	317.83
Density (g/cm³)	5.51	0.27	1.33
Surface Gravity (g)	1.00	0.70	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	143.024 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	146.201 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 86226

HIP

HIP 48739

TIC

TIC 22221375

Gaia DR2

Gaia DR2 5660492297395345408

Gaia DR3

Gaia DR3 5660492297395345408

System

HD 86226

Percentile among Gas Giant cohort

Radius 14.300 R⊕ · percentile 82 / cohort 1771

Mass 143.024 M⊕ · percentile 11 / cohort 1747

Orbital period 1,628.00 d · percentile 82 / cohort 1533

Distance 45.68 pc · percentile 17 / cohort 1759

ESI 0.237 · percentile 42 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,628.000 days

Semi-major axis

2.7300 AU

Eccentricity

0.059

Inclination

— °

Year Length

A year here lasts about 4.46 Earth years on a nearly circular orbit at a mean orbital distance of 2.7300 AU.

Eq. Temperature

176K

(-97 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.237

0 = alien, 1 = Earth-identical

Insufficient insolation data — surface water would be frozen.

Discovery Paper

Primary reference

Arriagada et al. 2010

Instrument

MIKE Spectrograph

Publication

2010-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2009 at Las Campanas Observatory (4 shown).

HD 152079 b · Gas Giant HD 129445 b · Gas Giant HD 164604 b · Gas Giant HD 175167 b · Gas Giant

Host System: HD 86226

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,863 K — hotter than the Sun (5,778 K)

Estimated Age

4.60 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.053 R☉

Stellar Mass

1.019 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.400 dex

Stellar density

1.233 g/cm³

Systemic radial velocity

19.78 km/s

Rotational v·sin i

2.40 km/s

Rotation period

22.80 days

Activity index (log R'HK)

-4.946

Metallicity ratio

[Fe/H]

Distance

45.68 parsec

Light-years 149.00 ly

V-band magnitude

7.93 mag

Voyager-speed travel 2,627,577 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

21.861 mas

Total Proper Motion

183.207 mas/yr

PM Right Ascension

-177.11 mas/yr

PM Declination

46.87 mas/yr

Galactic Cartesian (pc)

x = -0.783 · y = 0.468 · z = -0.408

Equatorial (J2000)

RA 149.12352° · Dec -24.09919°

Galactic ℓ, b

259.394° · 23.629°

Ecliptic λ, β

161.152° · -34.123°

HTM-20 index

-779098379