Key parameters at a glance

A radius of 13.40 Earth radii
A mass of 616.90 Earth masses
Surface gravity around 3.44 g
An orbital period of 136.970 days
Semi-major axis 0.6250 AU
Distance from Earth 183.25 light-years
Earth Similarity Index 0.363
Travel time at Voyager 1 speed 3,231,673 years

xi Aql b Planet Profile

Physical Specs

Radius

13.40 R⊕

Radius (Jupiter)

1.200 R♃

Mass

616.90 M⊕

Mass (Jupiter)

1.941 M♃

Density

1.41 g/cm³

Surface Gravity

3.44 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.363

HZ Position Unknown

Controversial No

Discovery

Year 2007

Method Radial Velocity

Facility Okayama Astrophysical Observatory

Telescope 1.88 m Telescope

Size rank in cohort

Rank by radius

#730of 1771

top 41.2%

This planet

13.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 114783 c 13.40 R⊕ HIP 79431 b 13.40 R⊕ HD 68988 b 13.40 R⊕

Metric	Earth	xi Aql b	Jupiter
Radius (R⊕)	1.00	13.40	11.21
Mass (M⊕)	1.00	616.90	317.83
Density (g/cm³)	5.51	1.41	1.33
Surface Gravity (g)	1.00	3.44	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	616.905 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 188310

HIP

HIP 97938

TIC

TIC 375464367

Gaia DR2

Gaia DR2 4298361114750843904

Gaia DR3

Gaia DR3 4298361114753012992

System

xi Aql

Percentile among Gas Giant cohort

Radius 13.400 R⊕ · percentile 56 / cohort 1771

Mass 616.905 M⊕ · percentile 54 / cohort 1747

Orbital period 136.97 d · percentile 55 / cohort 1533

Distance 56.19 pc · percentile 23 / cohort 1759

ESI 0.363 · percentile 74 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

136.970 days

Semi-major axis

0.6250 AU

Eccentricity

0.059

Inclination

— °

Year Length

A year here lasts approximately 136.97 Earth days (37.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.6250 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.363

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Sato et al. 2008

Instrument

HIDES Echelle Spectrograph

Publication

2008-06

Observation locale

Ground

Host System: xi Aql

Spectral Class

K-type orange

Effective Temperature

4,841 K — cooler than the Sun (5,778 K)

Estimated Age

7.10 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

10.860 R☉

Stellar Mass

1.740 M☉

Metallicity [Fe/H]

-0.11

Extended Stellar Properties

Surface gravity (log g)

2.610 dex

Systemic radial velocity

-41.66 km/s

Metallicity ratio

[Fe/H]

Distance

56.19 parsec

Light-years 183.25 ly

V-band magnitude

4.71 mag

Voyager-speed travel 3,231,673 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

17.773 mas

Total Proper Motion

129.341 mas/yr

PM Right Ascension

101.18 mas/yr

PM Declination

-80.58 mas/yr

Galactic Cartesian (pc)

x = 0.473 · y = -0.869 · z = 0.147

Equatorial (J2000)

RA 298.56245° · Dec 8.46111°

Galactic ℓ, b

47.813° · -9.855°

Ecliptic λ, β

302.630° · 28.722°

HTM-20 index

1923703462

Observation Record

Photometric series

RV measurements

Archive notes

Similar Worlds

HD 93083 b

Gas Giant · K-type orange

Radius 13.40 R⊕ · 93.0 ly

Kepler-48 e

Gas Giant · K-type orange

Radius 13.40 R⊕ · 1,000.4 ly

HD 47366 b

Gas Giant · K-type orange

Radius 13.40 R⊕ · 275.1 ly

HIP 114933 b

Gas Giant · K-type orange

Radius 13.40 R⊕ · 331.9 ly

HD 114783 c

Gas Giant · K-type orange

Radius 13.40 R⊕ · 68.7 ly

HD 4732 b

Gas Giant · K-type orange

Radius 13.40 R⊕ · 178.7 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Okayama Astrophysical Observatory Mission K-type orange Hosts