Key parameters at a glance

A radius of 12.20 Earth radii
A mass of 5,050.32 Earth masses
Surface gravity around 33.93 g
An orbital period of 745.700 days
Semi-major axis 1.9200 AU
Distance from Earth 3,044.27 light-years
Earth Similarity Index 0.321
Travel time at Voyager 1 speed 53,685,612 years

HD 240237 b Planet Profile

Physical Specs

Radius

12.20 R⊕

Radius (Jupiter)

1.090 R♃

Mass

5,050.32 M⊕

Mass (Jupiter)

15.890 M♃

Density

15.30 g/cm³

Surface Gravity

33.93 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.321

HZ Position Unknown

Controversial No

Discovery

Year 2011

Method Radial Velocity

Facility McDonald Observatory

Telescope 9.2 m Hobby-Eberly Telescope

Size rank in cohort

Rank by radius

#1410of 1771

top 79.6%

This planet

12.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

FU Tau b 12.20 R⊕ HD 168443 c 12.20 R⊕ HIP 5158 c 12.20 R⊕

Metric	Earth	HD 240237 b	Jupiter
Radius (R⊕)	1.00	12.20	11.21
Mass (M⊕)	1.00	5,050.32	317.83
Density (g/cm³)	5.51	15.30	1.33
Surface Gravity (g)	1.00	33.93	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	5,050.319 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 240237

HIP

HIP 114840

TIC

TIC 323919676

Gaia DR2

Gaia DR2 2010336687886382592

Gaia DR3

Gaia DR3 2010336687886382592

System

HD 240237

Percentile among Gas Giant cohort

Radius 12.200 R⊕ · percentile 19 / cohort 1771

Mass 5,050.319 M⊕ · percentile 94 / cohort 1747

Orbital period 745.70 d · percentile 73 / cohort 1533

Distance 933.38 pc · percentile 85 / cohort 1759

ESI 0.321 · percentile 63 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

745.700 days

Semi-major axis

1.9200 AU

Eccentricity

0.400

Inclination

— °

Year Length

A year here lasts about 2.04 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.9200 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.321

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Gettel et al. 2012

Instrument

High Resolution Spectrograph

Publication

2012-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2011 at McDonald Observatory (4 shown).

HD 220773 b · Gas Giant HD 79498 b · Gas Giant BD+48 738 b · Gas Giant HD 96127 b · Gas Giant

Host System: HD 240237

Spectral Class

K-type orange

Effective Temperature

3,926 K — cooler than the Sun (5,778 K)

Estimated Age

4.42 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

71.230 R☉

Stellar Mass

8.760 M☉

Metallicity [Fe/H]

-0.25

Extended Stellar Properties

Surface gravity (log g)

1.670 dex

Systemic radial velocity

-24.43 km/s

Metallicity ratio

[Fe/H]

Distance

933.38 parsec

Light-years 3,044.27 ly

V-band magnitude

8.19 mag

Voyager-speed travel 53,685,612 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

1.044 mas

Total Proper Motion

4.295 mas/yr

PM Right Ascension

-0.20 mas/yr

PM Declination

-4.29 mas/yr

Galactic Cartesian (pc)

x = 0.519 · y = -0.102 · z = 0.848

Equatorial (J2000)

RA 348.92593° · Dec 58.04322°

Galactic ℓ, b

110.521° · -2.503°

Ecliptic λ, β

25.178° · 54.972°

HTM-20 index

1567485262

Similar Worlds

iot Dra c

Gas Giant · K-type orange

Radius 12.20 R⊕ · 102.2 ly

HIP 5158 c

Gas Giant · K-type orange

Radius 12.20 R⊕ · 168.3 ly

WASP-160 B b

Gas Giant · K-type orange

Radius 12.22 R⊕ · 940.4 ly

NGTS-8 b

Gas Giant · K-type orange

Radius 12.22 R⊕ · 1,399.1 ly

OGLE-TR-113 b

Gas Giant · K-type orange

Radius 12.25 R⊕ · 1,847.5 ly

WASP-2 b

Gas Giant · K-type orange

Radius 12.12 R⊕ · 499.8 ly

Explore Related Categories

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