Key parameters at a glance

A radius of 13.00 Earth radii
A mass of 1,207.75 Earth masses
Surface gravity around 7.15 g
An orbital period of 1,333.000 days
Semi-major axis 2.4500 AU
Distance from Earth 180.33 light-years
Earth Similarity Index 0.414
Travel time at Voyager 1 speed 3,180,056 years

HD 28254 b Planet Profile

Physical Specs

Radius

13.00 R⊕

Radius (Jupiter)

1.160 R♃

Mass

1,207.75 M⊕

Mass (Jupiter)

3.800 M♃

Density

3.02 g/cm³

Surface Gravity

7.15 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.414

HZ Position Unknown

Controversial No

Discovery

Year 2010

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#960of 1771

top 54.2%

This planet

13.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HIP 14810 b 13.00 R⊕ HD 47186 c 13.00 R⊕ WASP-107 c 13.00 R⊕

Metric	Earth	HD 28254 b	Jupiter
Radius (R⊕)	1.00	13.00	11.21
Mass (M⊕)	1.00	1,207.75	317.83
Density (g/cm³)	5.51	3.02	1.33
Surface Gravity (g)	1.00	7.15	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,207.748 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	368.670 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 28254

HIP

HIP 20606

TIC

TIC 219256496

Gaia DR2

Gaia DR2 4781553628548774656

Gaia DR3

Gaia DR3 4781553628548774656

System

HD 28254

Percentile among Gas Giant cohort

Radius 13.000 R⊕ · percentile 43 / cohort 1771

Mass 1,207.748 M⊕ · percentile 71 / cohort 1747

Orbital period 1,333.00 d · percentile 81 / cohort 1533

Distance 55.29 pc · percentile 23 / cohort 1759

ESI 0.414 · percentile 89 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,333.000 days

Semi-major axis

2.4500 AU

Eccentricity

0.950

Inclination

162.00 °

Year Length

A year here lasts about 3.65 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.4500 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.414

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Naef et al. 2010

Instrument

HARPS Spectrograph

Publication

2010-11

Observation locale

Ground

Discovery cohort

Planets confirmed in 2010 at La Silla Observatory (12 shown).

GJ 3634 b · Sub-Neptune HD 10180 f · Neptune-like HD 10180 e · Neptune-like GJ 676 A b · Gas Giant HD 204313 b · Gas Giant HD 1690 b · Gas Giant HD 10180 h · Neptune-like HD 113538 c · Gas Giant HD 25171 b · Gas Giant HD 8535 b · Gas Giant HD 44219 b · Gas Giant HD 43197 b · Gas Giant

Host System: HD 28254

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,664 K — cooler than the Sun (5,778 K)

Estimated Age

6.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.480 R☉

Stellar Mass

1.100 M☉

Metallicity [Fe/H]

0.06

Extended Stellar Properties

Surface gravity (log g)

4.120 dex

Stellar density

0.358 g/cm³

Systemic radial velocity

-9.32 km/s

Rotational v·sin i

2.30 km/s

Activity index (log R'HK)

-5.170

Metallicity ratio

[Fe/H]

Distance

55.29 parsec

Light-years 180.33 ly

V-band magnitude

7.69 mag

Voyager-speed travel 3,180,056 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

18.058 mas

Total Proper Motion

158.624 mas/yr

PM Right Ascension

-67.39 mas/yr

PM Declination

-143.60 mas/yr

Galactic Cartesian (pc)

x = 0.256 · y = 0.581 · z = -0.773

Equatorial (J2000)

RA 66.21081° · Dec -50.62281°

Galactic ℓ, b

258.282° · -43.591°

Ecliptic λ, β

41.336° · -70.071°

HTM-20 index

479507696