Key parameters at a glance

A radius of 14.10 Earth radii
A mass of 207.23 Earth masses
Surface gravity around 1.04 g
An orbital period of 885.500 days
Semi-major axis 1.7100 AU
Distance from Earth 103.27 light-years
Earth Similarity Index 0.273
Travel time at Voyager 1 speed 1,821,203 years

2 siblings around HD 37124

HD 37124 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 37124 b	Gas Giant	14.00	214.54	154.378	—	2002
HD 37124 c this	Gas Giant	14.10	207.23	885.500	—	2002
HD 37124 d	Gas Giant	14.00	221.21	1,862.000	—	2005

HD 37124 c Planet Profile

Physical Specs

Radius

14.10 R⊕

Radius (Jupiter)

1.250 R♃

Mass

207.23 M⊕

Mass (Jupiter)

0.652 M♃

Density

0.41 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.273

HZ Position Unknown

Controversial No

Discovery

Year 2002

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I 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 103720 b 14.10 R⊕ HD 216770 b 14.10 R⊕

Metric	Earth	HD 37124 c	Jupiter
Radius (R⊕)	1.00	14.10	11.21
Mass (M⊕)	1.00	207.23	317.83
Density (g/cm³)	5.51	0.41	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	207.225 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 37124

HIP

HIP 26381

TIC

TIC 19631691

Gaia DR2

Gaia DR2 3402798414192387328

Gaia DR3

Gaia DR3 3402798414192387328

System

HD 37124

Percentile among Gas Giant cohort

Radius 14.100 R⊕ · percentile 77 / cohort 1771

Mass 207.225 M⊕ · percentile 21 / cohort 1747

Orbital period 885.50 d · percentile 75 / cohort 1533

Distance 31.66 pc · percentile 8 / cohort 1759

ESI 0.273 · percentile 50 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

885.500 days

Semi-major axis

1.7100 AU

Eccentricity

0.125

Inclination

— °

Year Length

A year here lasts about 2.42 Earth years on a mildly elliptical path at a mean orbital distance of 1.7100 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

15.400 m/s

Transit mid-time (BJD)

2,454,937.0000

Long. of periastron (ω)

53.00°

Angular separation (arcsec)

54.00000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.273

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Butler et al. 2003

Instrument

HIRES Spectrometer

Publication

2003-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2002 at W. M. Keck Observatory (7 shown).

HD 49674 b · Neptune-like 14 Her b · Gas Giant HD 72659 b · Gas Giant HD 128311 b · Gas Giant HD 108874 b · Gas Giant HD 114729 b · Gas Giant HD 37124 b · Gas Giant

Host System: HD 37124

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,699 K — cooler than the Sun (5,778 K)

Estimated Age

4.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.949 R☉

Stellar Mass

0.850 M☉

Metallicity [Fe/H]

-0.44

Extended Stellar Properties

Surface gravity (log g)

4.391 dex

Stellar density

1.713 g/cm³

Systemic radial velocity

-22.98 km/s

Rotational v·sin i

1.20 km/s

Activity index (log R'HK)

-4.900

Metallicity ratio

[Fe/H]

Distance

31.66 parsec

Light-years 103.27 ly

V-band magnitude

7.68 mag

Voyager-speed travel 1,821,203 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

31.554 mas

Total Proper Motion

427.636 mas/yr

PM Right Ascension

-79.61 mas/yr

PM Declination

-420.16 mas/yr

Galactic Cartesian (pc)

x = 0.094 · y = 0.931 · z = 0.354

Equatorial (J2000)

RA 84.25999° · Dec 20.72898°

Galactic ℓ, b

185.964° · -5.975°

Ecliptic λ, β

84.623° · -2.603°

HTM-20 index

1372615396

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes