Key parameters at a glance

A radius of 13.40 Earth radii
A mass of 645.19 Earth masses
Surface gravity around 3.59 g
An orbital period of 227.000 days
Semi-major axis 0.7600 AU
Distance from Earth 146.20 light-years
Earth Similarity Index 0.366
Travel time at Voyager 1 speed 2,578,307 years

HD 8574 b Planet Profile

Physical Specs

Radius

13.40 R⊕

Radius (Jupiter)

1.190 R♃

Mass

645.19 M⊕

Mass (Jupiter)

2.030 M♃

Density

1.47 g/cm³

Surface Gravity

3.59 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.366

HZ Position Unknown

Controversial No

Discovery

Year 2002

Method Radial Velocity

Facility Haute-Provence Observatory

Telescope 1.93 m Telescope

Size rank in cohort

Rank by radius

#730of 1771

top 41.2%

This planet

13.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 114783 c 13.40 R⊕ HIP 79431 b 13.40 R⊕ HD 68988 b 13.40 R⊕

Metric	Earth	HD 8574 b	Jupiter
Radius (R⊕)	1.00	13.40	11.21
Mass (M⊕)	1.00	645.19	317.83
Density (g/cm³)	5.51	1.47	1.33
Surface Gravity (g)	1.00	3.59	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	645.195 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 8574

HIP

HIP 6643

TIC

TIC 18121498

Gaia DR2

Gaia DR2 297045096447719040

Gaia DR3

Gaia DR3 297045096447719040

System

HD 8574

Percentile among Gas Giant cohort

Radius 13.400 R⊕ · percentile 56 / cohort 1771

Mass 645.195 M⊕ · percentile 56 / cohort 1747

Orbital period 227.00 d · percentile 58 / cohort 1533

Distance 44.83 pc · percentile 16 / cohort 1759

ESI 0.366 · percentile 75 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

227.000 days

Semi-major axis

0.7600 AU

Eccentricity

0.300

Inclination

— °

Year Length

A year here lasts approximately 227.00 Earth days (62.1% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.7600 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

58.300 m/s

Transit mid-time (BJD)

2,453,548.1000

Long. of periastron (ω)

18.00°

Angular separation (arcsec)

17.00000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.366

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Perrier et al. 2003

Instrument

ELODIE Spectrograph

Publication

2003-11

Observation locale

Ground

Host System: HD 8574

Spectral Class

F-type yellow-white

Effective Temperature

6,064 K — hotter than the Sun (5,778 K)

Estimated Age

5.60 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.380 R☉

Stellar Mass

1.340 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.280 dex

Stellar density

0.560 g/cm³

Systemic radial velocity

18.60 km/s

Rotational v·sin i

4.50 km/s

Activity index (log R'HK)

-5.070

Metallicity ratio

[Fe/H]

Distance

44.83 parsec

Light-years 146.20 ly

V-band magnitude

7.12 mag

Voyager-speed travel 2,578,307 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

22.280 mas

Total Proper Motion

296.640 mas/yr

PM Right Ascension

251.40 mas/yr

PM Declination

-157.46 mas/yr

Galactic Cartesian (pc)

x = 0.818 · y = 0.319 · z = 0.478

Equatorial (J2000)

RA 21.30338° · Dec 28.56602°

Galactic ℓ, b

131.852° · -33.720°

Ecliptic λ, β

30.546° · 18.167°

HTM-20 index

1170402629

Observation Record

Photometric series

RV measurements

Stellar spectra