Key parameters at a glance

A radius of 14.10 Earth radii
A mass of 181.16 Earth masses
Surface gravity around 0.91 g
An orbital period of 118.450 days
Semi-major axis 0.4600 AU
Distance from Earth 119.58 light-years
Earth Similarity Index 0.264
Travel time at Voyager 1 speed 2,108,739 years

HD 216770 b Planet Profile

Physical Specs

Radius

14.10 R⊕

Radius (Jupiter)

1.260 R♃

Mass

181.16 M⊕

Mass (Jupiter)

0.570 M♃

Density

0.36 g/cm³

Surface Gravity

0.91 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.264

HZ Position Unknown

Controversial No

Discovery

Year 2003

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler 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 44219 b 14.10 R⊕

Metric	Earth	HD 216770 b	Jupiter
Radius (R⊕)	1.00	14.10	11.21
Mass (M⊕)	1.00	181.16	317.83
Density (g/cm³)	5.51	0.36	1.33
Surface Gravity (g)	1.00	0.91	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	181.163 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 216770

HIP

HIP 113238

TIC

TIC 47526465

Gaia DR2

Gaia DR2 6610107504955838336

Gaia DR3

Gaia DR3 6610107504955838336

System

HD 216770

Percentile among Gas Giant cohort

Radius 14.100 R⊕ · percentile 77 / cohort 1771

Mass 181.163 M⊕ · percentile 17 / cohort 1747

Orbital period 118.45 d · percentile 54 / cohort 1533

Distance 36.66 pc · percentile 11 / cohort 1759

ESI 0.264 · percentile 48 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

118.450 days

Semi-major axis

0.4600 AU

Eccentricity

0.370

Inclination

— °

Year Length

A year here lasts approximately 118.45 Earth days (32.4% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.4600 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.264

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Mayor et al. 2004

Instrument

CORALIE Spectrograph

Publication

2004-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2003 at La Silla Observatory (11 shown).

HD 169830 c · Gas Giant HD 111232 b · Gas Giant HD 82943 c · Gas Giant HD 142415 b · Gas Giant HD 82943 b · Gas Giant HD 121504 b · Gas Giant HD 114386 b · Gas Giant HD 19994 b · Gas Giant HD 65216 b · Gas Giant HD 41004 B b · Gas Giant HD 6434 b · Gas Giant

Host System: HD 216770

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,399 K — cooler than the Sun (5,778 K)

Estimated Age

3.10 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.930 R☉

Stellar Mass

0.740 M☉

Metallicity [Fe/H]

0.27

Extended Stellar Properties

Surface gravity (log g)

4.370 dex

Stellar density

1.490 g/cm³

Systemic radial velocity

30.70 km/s

Rotational v·sin i

1.40 km/s

Activity index (log R'HK)

-4.920

Metallicity ratio

[Fe/H]

Distance

36.66 parsec

Light-years 119.58 ly

V-band magnitude

8.11 mag

Voyager-speed travel 2,108,739 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

27.247 mas

Total Proper Motion

287.868 mas/yr

PM Right Ascension

226.44 mas/yr

PM Declination

-177.74 mas/yr

Galactic Cartesian (pc)

x = 0.859 · y = -0.247 · z = -0.449

Equatorial (J2000)

RA 343.97488° · Dec -26.65953°

Galactic ℓ, b

27.307° · -64.292°

Ecliptic λ, β

334.762° · -18.272°

HTM-20 index

-962041160

Observation Record

Photometric series

RV measurements

Archive notes