Key parameters at a glance

A radius of 14.00 Earth radii
A mass of 212.95 Earth masses
Surface gravity around 1.09 g
An orbital period of 1,558.000 days
Semi-major axis 2.6560 AU
Distance from Earth 210.81 light-years
Earth Similarity Index 0.277
Travel time at Voyager 1 speed 3,717,668 years

HD 211810 b Planet Profile

Physical Specs

Radius

14.00 R⊕

Radius (Jupiter)

1.250 R♃

Mass

212.95 M⊕

Mass (Jupiter)

0.670 M♃

Density

0.43 g/cm³

Surface Gravity

1.09 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.277

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

#415of 1771

top 23.4%

This planet

14.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 9446 b 14.00 R⊕ HD 156411 b 14.00 R⊕ HD 224693 b 14.00 R⊕

Metric	Earth	HD 211810 b	Jupiter
Radius (R⊕)	1.00	14.00	11.21
Mass (M⊕)	1.00	212.95	317.83
Density (g/cm³)	5.51	0.43	1.33
Surface Gravity (g)	1.00	1.09	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	212.946 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 211810

HIP

HIP 110094

TIC

TIC 336634601

Gaia DR2

Gaia DR2 2201556328489610752

Gaia DR3

Gaia DR3 2201556328489610752

System

HD 211810

Percentile among Gas Giant cohort

Radius 14.000 R⊕ · percentile 74 / cohort 1771

Mass 212.946 M⊕ · percentile 22 / cohort 1747

Orbital period 1,558.00 d · percentile 82 / cohort 1533

Distance 64.64 pc · percentile 27 / cohort 1759

ESI 0.277 · percentile 51 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,558.000 days

Semi-major axis

2.6560 AU

Eccentricity

0.680

Inclination

— °

Year Length

A year here lasts about 4.27 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.6560 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.277

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Ment et al. 2018

Instrument

HIRES Spectrometer

Publication

2018-11

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 211810

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,652 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.130 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.17

Extended Stellar Properties

Surface gravity (log g)

4.263 dex

Stellar density

0.771 g/cm³

Systemic radial velocity

-36.58 km/s

Metallicity ratio

[Fe/H]

Distance

64.64 parsec

Light-years 210.81 ly

V-band magnitude

8.59 mag

Voyager-speed travel 3,717,668 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

15.443 mas

Total Proper Motion

205.291 mas/yr

PM Right Ascension

159.80 mas/yr

PM Declination

128.88 mas/yr

Galactic Cartesian (pc)

x = 0.436 · y = -0.208 · z = 0.876

Equatorial (J2000)

RA 334.52867° · Dec 61.13499°

Galactic ℓ, b

105.475° · 3.572°

Ecliptic λ, β

19.909° · 62.384°

HTM-20 index

432483814