Key parameters at a glance

A radius of 13.30 Earth radii
A mass of 797.75 Earth masses
Surface gravity around 4.51 g
An orbital period of 1,840.000 days
Semi-major axis 2.9000 AU
Distance from Earth 219.96 light-years
Earth Similarity Index 0.382
Travel time at Voyager 1 speed 3,878,907 years

HD 129445 b Planet Profile

Physical Specs

Radius

13.30 R⊕

Radius (Jupiter)

1.180 R♃

Mass

797.75 M⊕

Mass (Jupiter)

2.510 M♃

Density

1.86 g/cm³

Surface Gravity

4.51 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.382

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

#793of 1771

top 44.7%

This planet

13.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 b 13.30 R⊕ HD 103774 b 13.30 R⊕ GJ 876 b 13.30 R⊕

Metric	Earth	HD 129445 b	Jupiter
Radius (R⊕)	1.00	13.30	11.21
Mass (M⊕)	1.00	797.75	317.83
Density (g/cm³)	5.51	1.86	1.33
Surface Gravity (g)	1.00	4.51	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	797.749 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	508.507 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 129445

HIP

HIP 72203

TIC

TIC 258186667

Gaia DR2

Gaia DR2 5800013451037514496

Gaia DR3

Gaia DR3 5800013451037514496

System

HD 129445

Percentile among Gas Giant cohort

Radius 13.300 R⊕ · percentile 53 / cohort 1771

Mass 797.749 M⊕ · percentile 61 / cohort 1747

Orbital period 1,840.00 d · percentile 84 / cohort 1533

Distance 67.44 pc · percentile 27 / cohort 1759

ESI 0.382 · percentile 80 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,840.000 days

Semi-major axis

2.9000 AU

Eccentricity

0.700

Inclination

52.00 °

Year Length

A year here lasts about 5.04 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.9000 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.382

0 = alien, 1 = Earth-identical

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

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 164604 b · Gas Giant HD 175167 b · Gas Giant HD 86226 b · Gas Giant

Host System: HD 129445

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,646 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.176 R☉

Stellar Mass

0.990 M☉

Metallicity [Fe/H]

0.25

Extended Stellar Properties

Surface gravity (log g)

4.280 dex

Stellar density

0.904 g/cm³

Systemic radial velocity

7.50 km/s

Rotational v·sin i

3.00 km/s

Metallicity ratio

[Fe/H]

Distance

67.44 parsec

Light-years 219.96 ly

V-band magnitude

8.80 mag

Voyager-speed travel 3,878,907 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

14.800 mas

Total Proper Motion

205.908 mas/yr

PM Right Ascension

-197.79 mas/yr

PM Declination

-57.26 mas/yr

Galactic Cartesian (pc)

x = -0.271 · y = -0.240 · z = -0.932

Equatorial (J2000)

RA 221.51042° · Dec -68.76299°

Galactic ℓ, b

313.037° · -8.170°

Ecliptic λ, β

245.343° · -49.436°

HTM-20 index

1507517245