Key parameters at a glance

A radius of 13.60 Earth radii
A mass of 460.80 Earth masses
Surface gravity around 2.49 g
An orbital period of 3,724.700 days
Semi-major axis 4.9400 AU
Distance from Earth 164.74 light-years
Earth Similarity Index 0.339
Travel time at Voyager 1 speed 2,905,232 years

HD 220773 b Planet Profile

Physical Specs

Radius

13.60 R⊕

Radius (Jupiter)

1.210 R♃

Mass

460.80 M⊕

Mass (Jupiter)

1.450 M♃

Density

1.01 g/cm³

Surface Gravity

2.49 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.339

HZ Position Unknown

Controversial No

Discovery

Year 2011

Method Radial Velocity

Facility McDonald Observatory

Telescope 9.2 m Hobby-Eberly Telescope

Size rank in cohort

Rank by radius

#609of 1771

top 34.3%

This planet

13.60R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 19994 b 13.60 R⊕ HD 205739 b 13.60 R⊕ HD 79498 b 13.60 R⊕

Metric	Earth	HD 220773 b	Jupiter
Radius (R⊕)	1.00	13.60	11.21
Mass (M⊕)	1.00	460.80	317.83
Density (g/cm³)	5.51	1.01	1.33
Surface Gravity (g)	1.00	2.49	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	460.800 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 220773

HIP

HIP 115697

TIC

TIC 354326161

Gaia DR2

Gaia DR2 2761142326076104192

Gaia DR3

Gaia DR3 2761142326076104192

System

HD 220773

Percentile among Gas Giant cohort

Radius 13.600 R⊕ · percentile 63 / cohort 1771

Mass 460.800 M⊕ · percentile 46 / cohort 1747

Orbital period 3,724.70 d · percentile 90 / cohort 1533

Distance 50.51 pc · percentile 20 / cohort 1759

ESI 0.339 · percentile 68 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3,724.700 days

Semi-major axis

4.9400 AU

Eccentricity

0.510

Inclination

— °

Year Length

A year here lasts about 10.20 Earth years on a highly eccentric trajectory at a mean orbital distance of 4.9400 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.339

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Robertson et al. 2012

Instrument

High Resolution Spectrograph

Publication

2012-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2011 at McDonald Observatory (4 shown).

HD 79498 b · Gas Giant HD 240237 b · Gas Giant BD+48 738 b · Gas Giant HD 96127 b · Gas Giant

Host System: HD 220773

Spectral Class

F-type yellow-white

Effective Temperature

5,940 K — hotter than the Sun (5,778 K)

Estimated Age

4.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.680 R☉

Stellar Mass

1.160 M☉

Metallicity [Fe/H]

0.09

Extended Stellar Properties

Surface gravity (log g)

4.240 dex

Stellar density

0.334 g/cm³

Systemic radial velocity

-37.71 km/s

Rotational v·sin i

3.00 km/s

Metallicity ratio

[Fe/H]

Distance

50.51 parsec

Light-years 164.74 ly

V-band magnitude

7.11 mag

Voyager-speed travel 2,905,232 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

19.769 mas

Total Proper Motion

223.942 mas/yr

PM Right Ascension

27.12 mas/yr

PM Declination

-222.29 mas/yr

Galactic Cartesian (pc)

x = 0.978 · y = -0.144 · z = 0.150

Equatorial (J2000)

RA 351.61447° · Dec 8.64289°

Galactic ℓ, b

90.039° · -48.726°

Ecliptic λ, β

355.757° · 11.258°

HTM-20 index

1350515473