Key parameters at a glance

A radius of 13.50 Earth radii
A mass of 513.30 Earth masses
Surface gravity around 2.82 g
An orbital period of 400.500 days
Semi-major axis 1.1670 AU
Distance from Earth 666.26 light-years
Earth Similarity Index 0.349
Travel time at Voyager 1 speed 11,749,524 years

HD 4917 b Planet Profile

Physical Specs

Radius

13.50 R⊕

Radius (Jupiter)

1.210 R♃

Mass

513.30 M⊕

Mass (Jupiter)

1.615 M♃

Density

1.15 g/cm³

Surface Gravity

2.82 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.349

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#671of 1771

top 37.8%

This planet

13.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 45350 b 13.50 R⊕ HD 82943 b 13.50 R⊕ HD 27442 b 13.50 R⊕

Metric	Earth	HD 4917 b	Jupiter
Radius (R⊕)	1.00	13.50	11.21
Mass (M⊕)	1.00	513.30	317.83
Density (g/cm³)	5.51	1.15	1.33
Surface Gravity (g)	1.00	2.82	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	513.295 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 4917

HIP

HIP 3975

TIC

TIC 77481104

Gaia DR2

Gaia DR2 2376225982619175424

Gaia DR3

Gaia DR3 2376225982619175424

System

HD 4917

Percentile among Gas Giant cohort

Radius 13.500 R⊕ · percentile 59 / cohort 1771

Mass 513.295 M⊕ · percentile 49 / cohort 1747

Orbital period 400.50 d · percentile 64 / cohort 1533

Distance 204.28 pc · percentile 51 / cohort 1759

ESI 0.349 · percentile 71 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

400.500 days

Semi-major axis

1.1670 AU

Eccentricity

0.066

Inclination

— °

Year Length

A year here lasts about 1.10 Earth years on a nearly circular orbit at a mean orbital distance of 1.1670 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.349

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Luhn et al. 2019

Instrument

HIRES Spectrometer

Publication

2019-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2018 at W. M. Keck Observatory (12 shown).

HD 75784 c · Gas Giant HD 99706 c · Gas Giant HD 148164 c · Gas Giant HD 55696 b · Gas Giant HD 95089 c · Gas Giant HD 13167 b · Gas Giant HD 18015 b · Gas Giant HAT-P-11 c · Gas Giant HD 156279 c · Gas Giant HD 98736 b · Gas Giant HD 180053 b · Gas Giant HD 114783 c · Gas Giant

Host System: HD 4917

Spectral Class

K-type orange

Effective Temperature

4,802 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

5.010 R☉

Stellar Mass

1.320 M☉

Metallicity [Fe/H]

0.18

Extended Stellar Properties

Surface gravity (log g)

2.970 dex

Systemic radial velocity

-11.30 km/s

Metallicity ratio

[M/H]

Distance

204.28 parsec

Light-years 666.26 ly

V-band magnitude

8.03 mag

Voyager-speed travel 11,749,524 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

4.867 mas

Total Proper Motion

28.002 mas/yr

PM Right Ascension

24.03 mas/yr

PM Declination

-14.37 mas/yr

Galactic Cartesian (pc)

x = 0.951 · y = 0.216 · z = -0.224

Equatorial (J2000)

RA 12.77626° · Dec -12.92766°

Galactic ℓ, b

122.601° · -75.799°

Ecliptic λ, β

6.524° · -16.918°

HTM-20 index

1025273122

Similar Worlds

Kepler-46 c

Gas Giant · K-type orange

Radius 13.50 R⊕ · 2,534.4 ly

HD 222076 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 297.3 ly

HD 128311 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 53.3 ly

BD+48 740 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 2,174.1 ly

HD 81688 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 279.6 ly

HD 47366 c

Gas Giant · K-type orange

Radius 13.50 R⊕ · 275.1 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries W. M. Keck Observatory Mission K-type orange Hosts