Confirmed Exoplanet Discovered 2005

HD 189733 b

A gas giant orbiting the k-type orange HD 189733, located approximately 64.5 light-years from Earth.

Key parameters at a glance

  • A radius of 12.67 Earth radii
  • A mass of 359.15 Earth masses
  • Surface gravity around 2.24 g
  • An orbital period of 2.219 days
  • Semi-major axis 0.0313 AU
  • Equilibrium temperature 1,209 K (936 °C)
  • Distance from Earth 64.46 light-years
  • Earth Similarity Index 0.118
  • Travel time at Voyager 1 speed 1,136,766 years
  • Almost certainly tidally locked to its host star given the close orbit

HD 189733 b Planet Profile

Physical Specs

Radius
12.67 R⊕
Radius (Jupiter)
1.130 R♃
Mass
359.15 M⊕
Mass (Jupiter)
1.130 M♃
Density
0.94 g/cm³
Surface Gravity
2.24 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.118
HZ Position Inner
Controversial No

Discovery

Year 2005
Method Radial Velocity
Facility Haute-Provence Observatory
Telescope 1.93 m Telescope

Size rank in cohort

Rank by radius

#1170of 1771

top 66.0%

This planet

12.67R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TrES-1 b 12.67 R⊕ HATS-50 b 12.67 R⊕ WASP-8 b 12.67 R⊕
Metric Earth HD 189733 b Jupiter
Radius (R⊕)1.0012.6711.21
Mass (M⊕)1.00359.15317.83
Density (g/cm³)5.510.941.33
Surface Gravity (g)1.002.242.53
Insolation (S⊕)1.00356.000.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 359.148 M⊕ Direct mass measurement (not derived).
Minimum mass (M sin i) 369.634 M⊕ Lower bound from radial-velocity fitting.
Computed mass 370.685 M⊕ Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

HD

HD 189733

HIP

HIP 98505

TIC

TIC 256364928

Gaia DR2

Gaia DR2 1827242816201846144

Gaia DR3

Gaia DR3 1827242816201846144

System

HD 189733

Percentile among Gas Giant cohort

Radius 12.666 R⊕ · percentile 34 / cohort 1771
Mass 359.148 M⊕ · percentile 39 / cohort 1747
Orbital period 2.22 d · percentile 9 / cohort 1533
Distance 19.76 pc · percentile 4 / cohort 1759
ESI 0.118 · percentile 31 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period
2.219 days
Semi-major axis
0.0313 AU
Eccentricity
0.000
Inclination
85.71 °

Year Length

A year here lasts approximately 2.22 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0313 AU.

Transit Fingerprint

Depth

2.400 %

Duration

1.823 h

Impact parameter b

0.664

Rp / R★

0.155340

Transit midpoint (BJD)

2,453,955.5256

Photometric dip

Transit produces a flux drop of 24,000 ppm lasting ≈ 1.82 h.

Extended Orbital Architecture

Planet / star radius ratio

0.155340

Semi-major axis / stellar radius

8.840

Impact parameter (b)

0.664

RV semi-amplitude (K)

205.000 m/s

Transit mid-time (BJD)

2,453,955.5256

Long. of periastron (ω)

20.00°

Sky-projected obliquity (λ)

-0.40°

True obliquity (ψ)

7.00°

Angular separation (arcsec)

1.58000

Eq. Temperature

1,209K

(936 °C)

Insolation (S⊕)

356.00

Earth = 1.00

Earth Similarity (ESI)

0.118

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Orbital-brightness modulation

Host star brightness varies with the planet's orbit.

Discovery Paper

Primary reference

Bouchy et al. 2005

Instrument

ELODIE Spectrograph

Publication

2005-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2005 at Haute-Provence Observatory (3 shown).

HD 33564 b · Gas Giant HD 149143 b · Gas Giant HD 118203 b · Gas Giant

Host System: HD 189733

Spectral Class

K-type orange

Effective Temperature

5,052 K — cooler than the Sun (5,778 K)

Estimated Age

1.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.750 R☉

Stellar Mass

0.790 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

4.490 dex

Stellar density

2.650 g/cm³

Systemic radial velocity

-2.20 km/s

Rotational v·sin i

3.50 km/s

Rotation period

11.95 days

Metallicity ratio

[Fe/H]

Distance
19.76 parsec
Light-years 64.46 ly
V-band magnitude
7.67 mag
Voyager-speed travel 1,136,766 yr

Multi-band Host Photometry — 11 bands

5.38.68.61B7.67V7.41Gaia6.85TESS6.07J5.59H5.54K5.29W15.34W25.46W35.43W4

Astrometric Data

Parallax

50.569 mas

Total Proper Motion

250.247 mas/yr

PM Right Ascension

-3.29 mas/yr

PM Declination

-250.23 mas/yr

Galactic Cartesian (pc)

x = 0.464 · y = -0.797 · z = 0.386

Equatorial (J2000)

RA 300.18212° · Dec 22.70978°

Galactic ℓ, b

60.962° · -3.923°

Ecliptic λ, β

308.737° · 42.175°

HTM-20 index

-399656019

Observation Record

Photometric series

59

RV measurements

2

Stellar spectra

5

Transmission spectra

27

Emission spectra

29

Archive notes

4

Similar Worlds

TrES-1 b

Gas Giant · K-type orange

Radius 12.67 R⊕ · 520.7 ly

HD 168863 b

Gas Giant · K-type orange

Radius 12.70 R⊕ · 130.1 ly

HD 27894 d

Gas Giant · K-type orange

Radius 12.70 R⊕ · 142.9 ly

HIP 56640 b

Gas Giant · K-type orange

Radius 12.70 R⊕ · 399.0 ly

eps CrB b

Gas Giant · K-type orange

Radius 12.70 R⊕ · 227.9 ly

HIP 67851 c

Gas Giant · K-type orange

Radius 12.70 R⊕ · 209.1 ly

Explore Related Categories

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