Key parameters at a glance

A radius of 12.50 Earth radii
A mass of 3,146.40 Earth masses
Surface gravity around 20.14 g
An orbital period of 875.500 days
Semi-major axis 2.1000 AU
Distance from Earth 1,018.27 light-years
Earth Similarity Index 0.385
Travel time at Voyager 1 speed 17,957,112 years

HD 208527 b Planet Profile

Physical Specs

Radius

12.50 R⊕

Radius (Jupiter)

1.110 R♃

Mass

3,146.40 M⊕

Mass (Jupiter)

9.900 M♃

Density

8.85 g/cm³

Surface Gravity

20.14 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.385

HZ Position Unknown

Controversial No

Discovery

Year 2012

Method Radial Velocity

Facility Bohyunsan Optical Astronomical Observatory

Telescope 1.8 m Telescope

Size rank in cohort

Rank by radius

#1235of 1771

top 69.7%

This planet

12.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 156279 c 12.50 R⊕ HD 33283 b 12.50 R⊕ HD 156279 b 12.50 R⊕

Metric	Earth	HD 208527 b	Jupiter
Radius (R⊕)	1.00	12.50	11.21
Mass (M⊕)	1.00	3,146.40	317.83
Density (g/cm³)	5.51	8.85	1.33
Surface Gravity (g)	1.00	20.14	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	3,146.400 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 208527

HIP

HIP 108296

TIC

TIC 283621278

Gaia DR2

Gaia DR2 1781063082986968960

Gaia DR3

Gaia DR3 1781063087283857664

System

HD 208527

Percentile among Gas Giant cohort

Radius 12.500 R⊕ · percentile 28 / cohort 1771

Mass 3,146.400 M⊕ · percentile 87 / cohort 1747

Orbital period 875.50 d · percentile 75 / cohort 1533

Distance 312.20 pc · percentile 61 / cohort 1759

ESI 0.385 · percentile 81 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

875.500 days

Semi-major axis

2.1000 AU

Eccentricity

0.080

Inclination

— °

Year Length

A year here lasts about 2.40 Earth years on a nearly circular orbit at a mean orbital distance of 2.1000 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.385

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Lee et al. 2013

Instrument

BOES Echelle Spectrograph

Publication

2013-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2012 at Bohyunsan Optical Astronomical Observatory (3 shown).

eps CrB b · Gas Giant HD 66141 b · Gas Giant HD 220074 b · Gas Giant

Host System: HD 208527

Spectral Class

M-type red dwarf

Effective Temperature

4,035 K — cooler than the Sun (5,778 K)

Estimated Age

2.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

51.100 R☉

Stellar Mass

1.600 M☉

Metallicity [Fe/H]

-0.09

Extended Stellar Properties

Surface gravity (log g)

1.400 dex

Systemic radial velocity

4.79 km/s

Rotational v·sin i

3.60 km/s

Metallicity ratio

[Fe/H]

Distance

312.20 parsec

Light-years 1,018.27 ly

V-band magnitude

6.39 mag

Voyager-speed travel 17,957,112 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

3.180 mas

Total Proper Motion

15.077 mas/yr

PM Right Ascension

1.21 mas/yr

PM Declination

15.03 mas/yr

Galactic Cartesian (pc)

x = 0.800 · y = -0.479 · z = 0.362

Equatorial (J2000)

RA 329.09994° · Dec 21.23992°

Galactic ℓ, b

77.245° · -25.718°

Ecliptic λ, β

339.746° · 31.519°

HTM-20 index

-1800944628

Similar Worlds

TYC 2187-512-1 b

Gas Giant · M-type red dwarf

Radius 12.50 R⊕ · 50.5 ly

ROXs 42 B b

Gas Giant · M-type red dwarf

Radius 12.50 R⊕ · 468.3 ly

Kepler-94 c

Gas Giant · M-type red dwarf

Radius 12.50 R⊕ · 625.9 ly

TOI-4666 b

Gas Giant · M-type red dwarf

Radius 12.53 R⊕ · 504.7 ly

COCONUTS-2 b

Gas Giant · M-type red dwarf

Radius 12.44 R⊕ · 35.5 ly

HIP 55507 b

Gas Giant · M-type red dwarf

Radius 12.60 R⊕ · 83.1 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Bohyunsan Optical Astronomical Observatory Mission M-type red dwarf Hosts