Key parameters at a glance

A radius of 14.10 Earth radii
A mass of 197.05 Earth masses
Surface gravity around 0.99 g
An orbital period of 4.556 days
Semi-major axis 0.0498 AU
Distance from Earth 148.52 light-years
Earth Similarity Index 0.270
Travel time at Voyager 1 speed 2,619,076 years
Almost certainly tidally locked to its host star given the close orbit

HD 103720 b Planet Profile

Physical Specs

Radius

14.10 R⊕

Radius (Jupiter)

1.260 R♃

Mass

197.05 M⊕

Mass (Jupiter)

0.620 M♃

Density

0.39 g/cm³

Surface Gravity

0.99 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.270

HZ Position Unknown

Controversial No

Discovery

Year 2014

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#371of 1771

top 20.9%

This planet

14.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 27894 b 14.10 R⊕ HD 216770 b 14.10 R⊕ HD 44219 b 14.10 R⊕

Metric	Earth	HD 103720 b	Jupiter
Radius (R⊕)	1.00	14.10	11.21
Mass (M⊕)	1.00	197.05	317.83
Density (g/cm³)	5.51	0.39	1.33
Surface Gravity (g)	1.00	0.99	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	197.046 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 103720

HIP

HIP 58237

TIC

TIC 96195878

Gaia DR2

Gaia DR2 3601912720075891968

Gaia DR3

Gaia DR3 3601912720075891968

System

HD 103720

Percentile among Gas Giant cohort

Radius 14.100 R⊕ · percentile 77 / cohort 1771

Mass 197.046 M⊕ · percentile 19 / cohort 1747

Orbital period 4.56 d · percentile 34 / cohort 1533

Distance 45.54 pc · percentile 17 / cohort 1759

ESI 0.270 · percentile 50 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

4.556 days

Semi-major axis

0.0498 AU

Eccentricity

0.086

Inclination

— °

Year Length

A year here lasts approximately 4.56 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0498 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.270

0 = alien, 1 = Earth-identical

Insufficient insolation data. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Moutou et al. 2015

Instrument

HARPS Spectrograph

Publication

2015-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2014 at La Silla Observatory (4 shown).

HD 108341 b · Gas Giant BD-11 4672 b · Gas Giant HD 564 b · Gas Giant HD 30669 b · Gas Giant

Host System: HD 103720

Spectral Class

K-type orange

Effective Temperature

5,017 K — cooler than the Sun (5,778 K)

Estimated Age

3.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.730 R☉

Stellar Mass

0.794 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

4.430 dex

Stellar density

2.468 g/cm³

Systemic radial velocity

-6.50 km/s

Rotational v·sin i

0.42 km/s

Metallicity ratio

[Fe/H]

Distance

45.54 parsec

Light-years 148.52 ly

V-band magnitude

9.50 mag

Voyager-speed travel 2,619,076 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

21.932 mas

Total Proper Motion

77.084 mas/yr

PM Right Ascension

-63.98 mas/yr

PM Declination

-43.00 mas/yr

Galactic Cartesian (pc)

x = -0.999 · y = 0.014 · z = -0.048

Equatorial (J2000)

RA 179.17133° · Dec -2.77914°

Galactic ℓ, b

276.981° · 57.308°

Ecliptic λ, β

180.342° · -2.879°

HTM-20 index

-651874672

Similar Worlds

HD 83443 b

Gas Giant · K-type orange

Radius 14.10 R⊕ · 133.4 ly

HD 141399 e

Gas Giant · K-type orange

Radius 14.10 R⊕ · 120.7 ly

BD-10 3166 b

Gas Giant · K-type orange

Radius 14.10 R⊕ · 275.3 ly

HD 27894 b

Gas Giant · K-type orange

Radius 14.10 R⊕ · 142.9 ly

eps Eri b

Gas Giant · K-type orange

Radius 14.10 R⊕ · 10.4 ly

BD-11 4672 b

Gas Giant · K-type orange

Radius 14.10 R⊕ · 88.6 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries La Silla Observatory Mission K-type orange Hosts