Key parameters at a glance

A radius of 11.57 Earth radii
A mass of 1,323.47 Earth masses
Surface gravity around 9.89 g
An orbital period of 111.437 days
Semi-major axis 0.4603 AU
Equilibrium temperature 405 K (132 °C)
Distance from Earth 216.80 light-years
Earth Similarity Index 0.432
Travel time at Voyager 1 speed 3,823,259 years

Context from the literature

HD 80606 b is an eccentric hot Jupiter 217 light-years from the Sun in the constellation of Ursa Major. HD 80606 b was discovered orbiting the star HD 80606 in April 2001 by a team led by Michel Mayor and Didier Queloz. With a mass 4 times that of Jupiter, it is a gas giant. Because the planet transits the host star its radius can be determined using the transit method, and was found to be about the same as Jupiter's. Its density is slightly less than Earth's. It has an extremely eccentric orbit like a comet, with its orbit taking it very close to its star and then back out very far away from it every 111 days.

Excerpted from Wikipedia · full article

HD 80606 b Planet Profile

Physical Specs

Radius

11.57 R⊕

Radius (Jupiter)

1.032 R♃

Mass

1,323.47 M⊕

Mass (Jupiter)

4.164 M♃

Density

5.08 g/cm³

Surface Gravity

9.89 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.432

HZ Position Unknown

Controversial No

Discovery

Year 2001

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1582of 1771

top 89.3%

This planet

11.57R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HATS-74 A b 11.57 R⊕ Wendelstein-1 b 11.56 R⊕ Kepler-553 c 11.58 R⊕

Metric	Earth	HD 80606 b	Jupiter
Radius (R⊕)	1.00	11.57	11.21
Mass (M⊕)	1.00	1,323.47	317.83
Density (g/cm³)	5.51	5.08	1.33
Surface Gravity (g)	1.00	9.89	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,323.469 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	1,303.050 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 80606

HIP

HIP 45982

TIC

TIC 457134360

Gaia DR2

Gaia DR2 1019003226022657920

Gaia DR3

Gaia DR3 1019003226022657920

System

HD 80606

Percentile among Gas Giant cohort

Radius 11.568 R⊕ · percentile 11 / cohort 1771

Mass 1,323.469 M⊕ · percentile 72 / cohort 1747

Orbital period 111.44 d · percentile 54 / cohort 1533

Distance 66.47 pc · percentile 27 / cohort 1759

ESI 0.432 · percentile 94 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

111.437 days

Semi-major axis

0.4603 AU

Eccentricity

0.932

Inclination

89.24 °

Year Length

A year here lasts approximately 111.44 Earth days (30.5% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.4603 AU.

Transit Fingerprint

Depth

1.019 %

Duration

11.980 h

Impact parameter b

0.750

Rp / R★

0.100900

Transit midpoint (BJD)

2,458,888.0747

Photometric dip

Transit produces a flux drop of 10,190 ppm lasting ≈ 11.98 h.

Extended Orbital Architecture

Planet / star radius ratio

0.100900

Semi-major axis / stellar radius

94.452

Impact parameter (b)

0.750

RV semi-amplitude (K)

469.220 m/s

Transit mid-time (BJD)

2,458,888.0747

Long. of periastron (ω)

-58.89°

Sky-projected obliquity (λ)

50.00°

Angular separation (arcsec)

6.92000

Eq. Temperature

405K

(132 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.432

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water.

Detection Signatures

Transit photometry

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

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Naef et al. 2001

Instrument

Multiple Instruments

Publication

2001-08

Observation locale

Ground

Host System: HD 80606

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,565 K — cooler than the Sun (5,778 K)

Estimated Age

5.90 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.050 R☉

Stellar Mass

1.050 M☉

Metallicity [Fe/H]

0.35

Extended Stellar Properties

Surface gravity (log g)

4.420 dex

Stellar density

1.290 g/cm³

Systemic radial velocity

3.91 km/s

Rotational v·sin i

1.80 km/s

Activity index (log R'HK)

-5.090

Metallicity ratio

[Fe/H]

Distance

66.47 parsec

Light-years 216.80 ly

V-band magnitude

9.06 mag

Voyager-speed travel 3,823,259 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

15.015 mas

Total Proper Motion

56.881 mas/yr

PM Right Ascension

55.93 mas/yr

PM Declination

10.34 mas/yr

Galactic Cartesian (pc)

x = -0.491 · y = 0.402 · z = 0.773

Equatorial (J2000)

RA 140.65695° · Dec 50.60378°

Galactic ℓ, b

167.429° · 44.311°

Ecliptic λ, β

125.957° · 33.295°

HTM-20 index

1797170584

Observation Record

Photometric series

RV measurements

Stellar spectra

Emission spectra

Archive notes

Wikipedia → Image: Wikimedia Commons · Aldaron, a.k.a. Aldaron · CC BY-SA 3.0