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 466.000 days
Semi-major axis 1.2600 AU
Distance from Earth 189.64 light-years
Earth Similarity Index 0.270
Travel time at Voyager 1 speed 3,344,292 years

HD 31253 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 2010

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 31253 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)	197.055 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 31253

HIP

HIP 22826

TIC

TIC 436700755

Gaia DR2

Gaia DR2 3295354481521174656

Gaia DR3

Gaia DR3 3295354481521174656

System

HD 31253

Percentile among Gas Giant cohort

Radius 14.100 R⊕ · percentile 77 / cohort 1771

Mass 197.055 M⊕ · percentile 19 / cohort 1747

Orbital period 466.00 d · percentile 66 / cohort 1533

Distance 58.14 pc · percentile 24 / cohort 1759

ESI 0.270 · percentile 50 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

466.000 days

Semi-major axis

1.2600 AU

Eccentricity

0.300

Inclination

— °

Year Length

A year here lasts about 1.28 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.2600 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

12.000 m/s

Transit mid-time (BJD)

2,454,222.0000

Long. of periastron (ω)

244.00°

Angular separation (arcsec)

21.70000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.270

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Meschiari et al. 2011

Instrument

HIRES Spectrometer

Publication

2011-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2010 at W. M. Keck Observatory (12 shown).

HD 156668 b · Super-Earth HD 1461 b · Sub-Neptune GJ 876 e · Sub-Neptune HAT-P-17 c · Gas Giant HD 97658 b · Sub-Neptune HD 163607 c · Gas Giant HD 177830 c · Neptune-like HD 218566 b · Neptune-like HD 102956 b · Gas Giant HD 163607 b · Gas Giant GJ 1148 b · Gas Giant HD 164509 b · Gas Giant

Host System: HD 31253

Spectral Class

F-type yellow-white

Effective Temperature

6,130 K — hotter than the Sun (5,778 K)

Estimated Age

3.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.750 R☉

Stellar Mass

1.700 M☉

Metallicity [Fe/H]

0.17

Extended Stellar Properties

Surface gravity (log g)

4.180 dex

Stellar density

0.256 g/cm³

Systemic radial velocity

12.27 km/s

Rotational v·sin i

3.80 km/s

Activity index (log R'HK)

-5.110

Metallicity ratio

[Fe/H]

Distance

58.14 parsec

Light-years 189.64 ly

V-band magnitude

7.13 mag

Voyager-speed travel 3,344,292 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

17.170 mas

Total Proper Motion

99.796 mas/yr

PM Right Ascension

90.18 mas/yr

PM Declination

-42.75 mas/yr

Galactic Cartesian (pc)

x = 0.274 · y = 0.938 · z = 0.214

Equatorial (J2000)

RA 73.68229° · Dec 12.35201°

Galactic ℓ, b

187.393° · -19.044°

Ecliptic λ, β

73.805° · -10.175°

HTM-20 index

-1156421438

Observation Record

Photometric series

RV measurements

Stellar spectra