Key parameters at a glance

A radius of 13.70 Earth radii
A mass of 379.49 Earth masses
Surface gravity around 2.02 g
An orbital period of 358.270 days
Semi-major axis 1.0630 AU
Distance from Earth 220.11 light-years
Earth Similarity Index 0.323
Travel time at Voyager 1 speed 3,881,702 years

HD 208897 b Planet Profile

Physical Specs

Radius

13.70 R⊕

Radius (Jupiter)

1.220 R♃

Mass

379.49 M⊕

Mass (Jupiter)

1.194 M♃

Density

0.81 g/cm³

Surface Gravity

2.02 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.323

HZ Position Unknown

Controversial No

Discovery

Year 2017

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#554of 1771

top 31.2%

This planet

13.70R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 148164 b 13.70 R⊕ HD 114783 b 13.70 R⊕ HD 159243 b 13.70 R⊕

Metric	Earth	HD 208897 b	Jupiter
Radius (R⊕)	1.00	13.70	11.21
Mass (M⊕)	1.00	379.49	317.83
Density (g/cm³)	5.51	0.81	1.33
Surface Gravity (g)	1.00	2.02	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	379.487 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 208897

HIP

HIP 108513

TIC

TIC 423862056

Gaia DR2

Gaia DR2 1779772947826839808

Gaia DR3

Gaia DR3 1779772947826839808

System

HD 208897

Percentile among Gas Giant cohort

Radius 13.700 R⊕ · percentile 66 / cohort 1771

Mass 379.487 M⊕ · percentile 40 / cohort 1747

Orbital period 358.27 d · percentile 62 / cohort 1533

Distance 67.49 pc · percentile 27 / cohort 1759

ESI 0.323 · percentile 64 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

358.270 days

Semi-major axis

1.0630 AU

Eccentricity

0.020

Inclination

— °

Year Length

A year here lasts approximately 358.27 Earth days (98.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 1.0630 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.323

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Y X131 Lmaz et al. 2017

Instrument

Multiple Instruments

Publication

2017-11

Observation locale

Ground

Discovery cohort

Planets confirmed in 2017 at Multiple Observatories (12 shown).

GJ 625 b · Super-Earth TRAPPIST-1 e · Rocky Terrestrial TRAPPIST-1 f · Rocky Terrestrial TRAPPIST-1 g · Rocky Terrestrial TRAPPIST-1 h · Rocky Terrestrial HD 34445 e · Neptune-like BD+03 2562 b · Gas Giant HD 111591 b · Gas Giant HD 34445 d · Neptune-like MOA-2012-BLG-006L b · Gas Giant HD 76920 b · Gas Giant HD 34445 f · Neptune-like

Host System: HD 208897

Spectral Class

K-type orange

Effective Temperature

4,860 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

4.980 R☉

Stellar Mass

1.250 M☉

Metallicity [Fe/H]

0.21

Extended Stellar Properties

Surface gravity (log g)

3.130 dex

Systemic radial velocity

-14.58 km/s

Rotational v·sin i

3.90 km/s

Metallicity ratio

[Fe/H]

Distance

67.49 parsec

Light-years 220.11 ly

V-band magnitude

6.51 mag

Voyager-speed travel 3,881,702 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

14.789 mas

Total Proper Motion

83.470 mas/yr

PM Right Ascension

76.56 mas/yr

PM Declination

-33.26 mas/yr

Galactic Cartesian (pc)

x = 0.817 · y = -0.476 · z = 0.326

Equatorial (J2000)

RA 329.74906° · Dec 19.02016°

Galactic ℓ, b

76.039° · -27.752°

Ecliptic λ, β

339.373° · 29.240°

HTM-20 index

1245550079

Similar Worlds

BD+15 2940 b

Gas Giant · K-type orange

Radius 13.70 R⊕ · 1,390.8 ly

HD 116029 c

Gas Giant · K-type orange

Radius 13.70 R⊕ · 402.0 ly

HD 114783 b

Gas Giant · K-type orange

Radius 13.70 R⊕ · 68.7 ly

HD 100508 b

Gas Giant · K-type orange

Radius 13.70 R⊕ · 106.8 ly

HD 5608 b

Gas Giant · K-type orange

Radius 13.70 R⊕ · 189.5 ly

HD 130322 b

Gas Giant · K-type orange

Radius 13.70 R⊕ · 104.0 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Multiple Observatories Mission K-type orange Hosts