Key parameters at a glance

A radius of 13.50 Earth radii
A mass of 495.81 Earth masses
Surface gravity around 2.72 g
An orbital period of 2,198.140 days
Semi-major axis 3.2420 AU
Distance from Earth 164.01 light-years
Earth Similarity Index 0.346
Travel time at Voyager 1 speed 2,892,342 years

HD 27631 b Planet Profile

Physical Specs

Radius

13.50 R⊕

Radius (Jupiter)

1.210 R♃

Mass

495.81 M⊕

Mass (Jupiter)

1.560 M♃

Density

1.11 g/cm³

Surface Gravity

2.72 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.346

HZ Position Unknown

Controversial No

Discovery

Year 2012

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#671of 1771

top 37.8%

This planet

13.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 45350 b 13.50 R⊕ HD 82943 b 13.50 R⊕ HD 27442 b 13.50 R⊕

Metric	Earth	HD 27631 b	Jupiter
Radius (R⊕)	1.00	13.50	11.21
Mass (M⊕)	1.00	495.81	317.83
Density (g/cm³)	5.51	1.11	1.33
Surface Gravity (g)	1.00	2.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	495.812 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	474.838 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 27631

HIP

HIP 20199

TIC

TIC 7652514

Gaia DR2

Gaia DR2 4840050395924931968

Gaia DR3

Gaia DR3 4840050395924931968

System

HD 27631

Percentile among Gas Giant cohort

Radius 13.500 R⊕ · percentile 59 / cohort 1771

Mass 495.812 M⊕ · percentile 48 / cohort 1747

Orbital period 2,198.14 d · percentile 86 / cohort 1533

Distance 50.29 pc · percentile 19 / cohort 1759

ESI 0.346 · percentile 70 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2,198.140 days

Semi-major axis

3.2420 AU

Eccentricity

0.141

Inclination

74.00 °

Year Length

A year here lasts about 6.02 Earth years on a mildly elliptical path at a mean orbital distance of 3.2420 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.346

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

Marmier et al. 2013

Instrument

CORALIE Spectrograph

Publication

2013-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2012 at La Silla Observatory (11 shown).

GJ 676 A d · Super-Earth GJ 667 C b · Sub-Neptune GJ 676 A e · Sub-Neptune HD 77338 b · Neptune-like HD 166724 b · Gas Giant HD 219077 b · Gas Giant HD 98649 b · Gas Giant HD 196067 b · Gas Giant HD 220689 b · Gas Giant GJ 3470 b · Neptune-like HD 106515 A b · Gas Giant

Host System: HD 27631

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,737 K — cooler than the Sun (5,778 K)

Estimated Age

4.01 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.923 R☉

Stellar Mass

0.944 M☉

Metallicity [Fe/H]

-0.12

Extended Stellar Properties

Surface gravity (log g)

4.455 dex

Stellar density

1.127 g/cm³

Systemic radial velocity

21.11 km/s

Rotational v·sin i

1.34 km/s

Rotation period

31.00 days

Activity index (log R'HK)

-4.910

Metallicity ratio

[Fe/H]

Distance

50.29 parsec

Light-years 164.01 ly

V-band magnitude

8.26 mag

Voyager-speed travel 2,892,342 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

19.857 mas

Total Proper Motion

100.805 mas/yr

PM Right Ascension

-41.23 mas/yr

PM Declination

-91.99 mas/yr

Galactic Cartesian (pc)

x = 0.315 · y = 0.674 · z = -0.669

Equatorial (J2000)

RA 64.93922° · Dec -41.96066°

Galactic ℓ, b

246.324° · -45.365°

Ecliptic λ, β

48.178° · -61.810°

HTM-20 index

-1018489448