Key parameters at a glance

A radius of 12.80 Earth radii
A mass of 1,655.89 Earth masses
Surface gravity around 10.11 g
An orbital period of 882.700 days
Semi-major axis 1.8900 AU
Distance from Earth 133.30 light-years
Earth Similarity Index 0.433
Travel time at Voyager 1 speed 2,350,785 years

Context from the literature

HD 213240 b is an exoplanet located 134 light-years from the Solar System in the constellation of Grus. It is a gas giant orbiting the G-type star HD 213240.

Excerpted from Wikipedia · full article

HD 213240 b Planet Profile

Physical Specs

Radius

12.80 R⊕

Radius (Jupiter)

1.140 R♃

Mass

1,655.89 M⊕

Mass (Jupiter)

5.210 M♃

Density

4.34 g/cm³

Surface Gravity

10.11 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.433

HZ Position Unknown

Controversial No

Discovery

Year 2001

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#1063of 1771

top 60.0%

This planet

12.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 240210 b 12.80 R⊕ HD 29985 b 12.80 R⊕ HD 148164 c 12.80 R⊕

Metric	Earth	HD 213240 b	Jupiter
Radius (R⊕)	1.00	12.80	11.21
Mass (M⊕)	1.00	1,655.89	317.83
Density (g/cm³)	5.51	4.34	1.33
Surface Gravity (g)	1.00	10.11	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,655.886 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	1,773.491 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 213240

HIP

HIP 111143

TIC

TIC 144068704

Gaia DR2

Gaia DR2 6517058790835773440

Gaia DR3

Gaia DR3 6517058790835773440

System

HD 213240

Percentile among Gas Giant cohort

Radius 12.800 R⊕ · percentile 37 / cohort 1771

Mass 1,655.886 M⊕ · percentile 76 / cohort 1747

Orbital period 882.70 d · percentile 75 / cohort 1533

Distance 40.87 pc · percentile 14 / cohort 1759

ESI 0.433 · percentile 95 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

882.700 days

Semi-major axis

1.8900 AU

Eccentricity

0.420

Inclination

63.00 °

Year Length

A year here lasts about 2.42 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.8900 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.433

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

Santos et al. 2001

Instrument

CORALIE Spectrograph

Publication

2001-12

Observation locale

Ground

Host System: HD 213240

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,979 K — hotter than the Sun (5,778 K)

Estimated Age

4.60 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.510 R☉

Stellar Mass

1.570 M☉

Metallicity [Fe/H]

0.15

Extended Stellar Properties

Surface gravity (log g)

4.270 dex

Stellar density

0.441 g/cm³

Systemic radial velocity

-0.45 km/s

Rotational v·sin i

3.97 km/s

Activity index (log R'HK)

-5.000

Metallicity ratio

[Fe/H]

Distance

40.87 parsec

Light-years 133.30 ly

V-band magnitude

6.81 mag

Voyager-speed travel 2,350,785 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

24.439 mas

Total Proper Motion

236.876 mas/yr

PM Right Ascension

-136.03 mas/yr

PM Declination

-193.93 mas/yr

Galactic Cartesian (pc)

x = 0.602 · y = -0.246 · z = -0.760

Equatorial (J2000)

RA 337.75063° · Dec -49.43410°

Galactic ℓ, b

343.719° · -55.072°

Ecliptic λ, β

318.733° · -36.800°

HTM-20 index

744438854

Observation Record

Photometric series

RV measurements

Archive notes

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