Key parameters at a glance

A radius of 13.80 Earth radii
A mass of 314.64 Earth masses
Surface gravity around 1.65 g
An orbital period of 1,624.000 days
Semi-major axis 2.6590 AU
Distance from Earth 194.12 light-years
Earth Similarity Index 0.308
Travel time at Voyager 1 speed 3,423,304 years

1 sibling around HD 108874

HD 108874 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 108874 b	Gas Giant	13.60	451.32	394.481	—	2002
HD 108874 c this	Gas Giant	13.80	314.64	1,624.000	—	2005

HD 108874 c Planet Profile

Physical Specs

Radius

13.80 R⊕

Radius (Jupiter)

1.230 R♃

Mass

314.64 M⊕

Mass (Jupiter)

0.990 M♃

Density

0.66 g/cm³

Surface Gravity

1.65 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.308

HZ Position Unknown

Controversial No

Discovery

Year 2005

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#510of 1771

top 28.7%

This planet

13.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

GJ 179 b 13.80 R⊕ GJ 832 b 13.80 R⊕ HD 219415 b 13.80 R⊕

Metric	Earth	HD 108874 c	Jupiter
Radius (R⊕)	1.00	13.80	11.21
Mass (M⊕)	1.00	314.64	317.83
Density (g/cm³)	5.51	0.66	1.33
Surface Gravity (g)	1.00	1.65	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	314.640 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 108874

HIP

HIP 61028

TIC

TIC 371621238

Gaia DR2

Gaia DR2 3958951942642583936

Gaia DR3

Gaia DR3 3958951942642583936

System

HD 108874

Percentile among Gas Giant cohort

Radius 13.800 R⊕ · percentile 70 / cohort 1771

Mass 314.640 M⊕ · percentile 35 / cohort 1747

Orbital period 1,624.00 d · percentile 82 / cohort 1533

Distance 59.52 pc · percentile 25 / cohort 1759

ESI 0.308 · percentile 61 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,624.000 days

Semi-major axis

2.6590 AU

Eccentricity

0.239

Inclination

— °

Year Length

A year here lasts about 4.45 Earth years on a mildly elliptical path at a mean orbital distance of 2.6590 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

18.200 m/s

Transit mid-time (BJD)

2,454,785.0000

Long. of periastron (ω)

27.00°

Angular separation (arcsec)

44.70000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.308

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Vogt et al. 2005

Instrument

HIRES Spectrometer

Publication

2005-10

Observation locale

Ground

Discovery cohort

Planets confirmed in 2005 at W. M. Keck Observatory (12 shown).

GJ 876 d · Sub-Neptune HD 190360 c · Neptune-like HIP 14810 b · Gas Giant HD 128311 c · Gas Giant HD 66428 b · Gas Giant HD 50499 b · Gas Giant HD 107148 b · Neptune-like HD 109749 b · Gas Giant HD 37124 d · Gas Giant HD 11964 b · Gas Giant HD 99109 b · Gas Giant HD 164922 b · Gas Giant

Host System: HD 108874

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,551 K — cooler than the Sun (5,778 K)

Estimated Age

8.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.050 R☉

Stellar Mass

0.950 M☉

Metallicity [Fe/H]

0.19

Extended Stellar Properties

Surface gravity (log g)

4.440 dex

Stellar density

1.064 g/cm³

Systemic radial velocity

-30.70 km/s

Rotational v·sin i

2.20 km/s

Activity index (log R'HK)

-5.080

Metallicity ratio

[Fe/H]

Distance

59.52 parsec

Light-years 194.12 ly

V-band magnitude

8.76 mag

Voyager-speed travel 3,423,304 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

16.773 mas

Total Proper Motion

156.096 mas/yr

PM Right Ascension

127.45 mas/yr

PM Declination

-90.12 mas/yr

Galactic Cartesian (pc)

x = -0.913 · y = -0.122 · z = 0.389

Equatorial (J2000)

RA 187.61260° · Dec 22.87944°

Galactic ℓ, b

253.577° · 83.625°

Ecliptic λ, β

177.321° · 23.907°

HTM-20 index

1340463951

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes