Key parameters at a glance

A radius of 12.30 Earth radii
A mass of 4,338.20 Earth masses
Surface gravity around 28.67 g
An orbital period of 528.070 days
Semi-major axis 1.1670 AU
Distance from Earth 106.34 light-years
Earth Similarity Index 0.341
Travel time at Voyager 1 speed 1,875,270 years

HD 22781 b Planet Profile

Physical Specs

Radius

12.30 R⊕

Radius (Jupiter)

1.100 R♃

Mass

4,338.20 M⊕

Mass (Jupiter)

13.650 M♃

Density

12.80 g/cm³

Surface Gravity

28.67 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.341

HZ Position Unknown

Controversial No

Discovery

Year 2011

Method Radial Velocity

Facility Haute-Provence Observatory

Telescope 1.93 m Telescope

Size rank in cohort

Rank by radius

#1349of 1771

top 76.1%

This planet

12.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

CHXR 73 b 12.30 R⊕ HAT-P-13 c 12.30 R⊕ HD 11506 d 12.30 R⊕

Metric	Earth	HD 22781 b	Jupiter
Radius (R⊕)	1.00	12.30	11.21
Mass (M⊕)	1.00	4,338.20	317.83
Density (g/cm³)	5.51	12.80	1.33
Surface Gravity (g)	1.00	28.67	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	4,338.200 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 22781

HIP

HIP 17187

TIC

TIC 101166776

Gaia DR2

Gaia DR2 217334764042444288

Gaia DR3

Gaia DR3 217334764042444288

System

HD 22781

Percentile among Gas Giant cohort

Radius 12.300 R⊕ · percentile 22 / cohort 1771

Mass 4,338.200 M⊕ · percentile 93 / cohort 1747

Orbital period 528.07 d · percentile 69 / cohort 1533

Distance 32.60 pc · percentile 9 / cohort 1759

ESI 0.341 · percentile 68 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

528.070 days

Semi-major axis

1.1670 AU

Eccentricity

0.819

Inclination

— °

Year Length

A year here lasts about 1.45 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.1670 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.341

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Diaz et al. 2012

Instrument

SOPHIE Spectrograph

Publication

2012-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2011 at Haute-Provence Observatory (2 shown).

HD 156279 b · Gas Giant HD 222155 b · Gas Giant

Host System: HD 22781

Spectral Class

K-type orange

Effective Temperature

5,027 K — cooler than the Sun (5,778 K)

Estimated Age

4.80 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.743 R☉

Stellar Mass

0.750 M☉

Metallicity [Fe/H]

-0.37

Extended Stellar Properties

Surface gravity (log g)

4.600 dex

Stellar density

2.830 g/cm³

Systemic radial velocity

8.25 km/s

Rotational v·sin i

1.73 km/s

Metallicity ratio

[Fe/H]

Distance

32.60 parsec

Light-years 106.34 ly

V-band magnitude

8.78 mag

Voyager-speed travel 1,875,270 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

30.643 mas

Total Proper Motion

102.617 mas/yr

PM Right Ascension

40.58 mas/yr

PM Declination

-94.25 mas/yr

Galactic Cartesian (pc)

x = 0.485 · y = 0.698 · z = 0.527

Equatorial (J2000)

RA 55.20656° · Dec 31.82589°

Galactic ℓ, b

160.072° · -18.567°

Ecliptic λ, β

60.294° · 11.904°

HTM-20 index

-749464140

Observation Record

Photometric series

RV measurements

Archive notes

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Radius 12.30 R⊕ · 925.2 ly

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Radius 12.30 R⊕ · 408.7 ly

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Radius 12.30 R⊕ · 1,754.3 ly

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Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Haute-Provence Observatory Mission K-type orange Hosts