Key parameters at a glance

A radius of 12.90 Earth radii
A mass of 1,388.91 Earth masses
Surface gravity around 8.35 g
An orbital period of 5,138.700 days
Semi-major axis 5.9220 AU
Distance from Earth 65.43 light-years
Earth Similarity Index 0.423
Travel time at Voyager 1 speed 1,153,912 years

Context from the literature

HD 217107 c is an extrasolar planet approximately 64 light-years away from Earth in the constellation of Pisces. The planet was the second planet to be discovered orbiting the star HD 217107. HD 217107 c's existence was hypothesized in 1998 due to the eccentricity of the inner planet's orbit and confirmed in 2005 when radial velocity studies of the star indicated another, more distant and massive companion orbiting the star. The planet has an eccentric orbit lasting on order of a decade.

Excerpted from Wikipedia · full article

1 sibling around HD 217107

HD 217107 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 217107 b	Gas Giant	13.60	459.58	7.127	—	1998
HD 217107 c this	Gas Giant	12.90	1,388.91	5,138.700	—	2005

HD 217107 c Planet Profile

Physical Specs

Radius

12.90 R⊕

Radius (Jupiter)

1.150 R♃

Mass

1,388.91 M⊕

Mass (Jupiter)

4.370 M♃

Density

3.56 g/cm³

Surface Gravity

8.35 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.423

HZ Position Unknown

Controversial No

Discovery

Year 2005

Method Radial Velocity

Facility Lick Observatory

Telescope 3.0 m C. Donald Shane Telescope

Size rank in cohort

Rank by radius

#1011of 1771

top 57.0%

This planet

12.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 55696 b 12.90 R⊕ HD 24040 b 12.90 R⊕ BD-210397 c 12.90 R⊕

Metric	Earth	HD 217107 c	Jupiter
Radius (R⊕)	1.00	12.90	11.21
Mass (M⊕)	1.00	1,388.91	317.83
Density (g/cm³)	5.51	3.56	1.33
Surface Gravity (g)	1.00	8.35	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,388.910 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	1,434.306 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 217107

HIP

HIP 113421

TIC

TIC 38271828

Gaia DR2

Gaia DR2 2648914040357320576

Gaia DR3

Gaia DR3 2648914040357320576

System

HD 217107

Percentile among Gas Giant cohort

Radius 12.900 R⊕ · percentile 41 / cohort 1771

Mass 1,388.910 M⊕ · percentile 73 / cohort 1747

Orbital period 5,138.70 d · percentile 93 / cohort 1533

Distance 20.06 pc · percentile 4 / cohort 1759

ESI 0.423 · percentile 92 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

5,138.700 days

Semi-major axis

5.9220 AU

Eccentricity

0.392

Inclination

88.00 °

Year Length

A year here lasts about 14.07 Earth years on a highly eccentric trajectory at a mean orbital distance of 5.9220 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

53.080 m/s

Transit mid-time (BJD)

2,460,064.0000

Long. of periastron (ω)

205.00°

Angular separation (arcsec)

295.00000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.423

0 = alien, 1 = Earth-identical

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

Discovery Paper

Primary reference

Vogt et al. 2005

Instrument

Hamilton Echelle Spectrograph

Publication

2005-10

Observation locale

Ground

Host System: HD 217107

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,622 K — cooler than the Sun (5,778 K)

Estimated Age

11.90 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.225 R☉

Stellar Mass

1.045 M☉

Metallicity [Fe/H]

0.37

Extended Stellar Properties

Surface gravity (log g)

4.340 dex

Stellar density

0.801 g/cm³

Systemic radial velocity

-13.14 km/s

Rotational v·sin i

0.00 km/s

Activity index (log R'HK)

-5.080

Metallicity ratio

[Fe/H]

Distance

20.06 parsec

Light-years 65.43 ly

V-band magnitude

6.16 mag

Voyager-speed travel 1,153,912 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

49.817 mas

Total Proper Motion

16.398 mas/yr

PM Right Ascension

-7.11 mas/yr

PM Declination

-14.78 mas/yr

Galactic Cartesian (pc)

x = 0.963 · y = -0.266 · z = -0.042

Equatorial (J2000)

RA 344.56472° · Dec -2.39545°

Galactic ℓ, b

70.474° · -53.324°

Ecliptic λ, β

344.855° · 3.866°

HTM-20 index

1794766806

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes

Wikipedia → Image: Wikimedia Commons · The original uploader was Mai Ngọc Xuân at Vietnamese Wikipedia. · Public domain