Key parameters at a glance

A radius of 12.30 Earth radii
A mass of 4,210.59 Earth masses
Surface gravity around 27.83 g
An orbital period of 1,644.691 days
Semi-major axis 2.9700 AU
Distance from Earth 123.49 light-years
Earth Similarity Index 0.345
Travel time at Voyager 1 speed 2,177,726 years

HD 8673 b Planet Profile

Physical Specs

Radius

12.30 R⊕

Radius (Jupiter)

1.100 R♃

Mass

4,210.59 M⊕

Mass (Jupiter)

13.248 M♃

Density

12.40 g/cm³

Surface Gravity

27.83 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.345

HZ Position Unknown

Controversial No

Discovery

Year 2009

Method Radial Velocity

Facility Thueringer Landessternwarte Tautenburg

Telescope 2.0 m Alfred Jensch Telescope

Size rank in cohort

Rank by radius

#1349of 1771

top 76.1%

This planet

12.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HAT-P-13 c 12.30 R⊕ HD 22781 b 12.30 R⊕ CHXR 73 b 12.30 R⊕

Metric	Earth	HD 8673 b	Jupiter
Radius (R⊕)	1.00	12.30	11.21
Mass (M⊕)	1.00	4,210.59	317.83
Density (g/cm³)	5.51	12.40	1.33
Surface Gravity (g)	1.00	27.83	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	4,210.591 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	4,513.000 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 8673

HIP

HIP 6702

TIC

TIC 80535228

Gaia DR2

Gaia DR2 317350357498173312

Gaia DR3

Gaia DR3 317350357498173312

System

HD 8673

Percentile among Gas Giant cohort

Radius 12.300 R⊕ · percentile 22 / cohort 1771

Mass 4,210.591 M⊕ · percentile 92 / cohort 1747

Orbital period 1,644.69 d · percentile 83 / cohort 1533

Distance 37.86 pc · percentile 12 / cohort 1759

ESI 0.345 · percentile 69 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,644.691 days

Semi-major axis

2.9700 AU

Eccentricity

0.730

Inclination

95.45 °

Year Length

A year here lasts about 4.50 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.9700 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.345

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Hartmann et al. 2010

Instrument

Coude Echelle Spectrograph

Publication

2010-07

Observation locale

Ground

Discovery cohort

Planets confirmed in 2009 at Thueringer Landessternwarte Tautenburg (2 shown).

HD 32518 b · Gas Giant 11 UMi b · Gas Giant

Host System: HD 8673

Spectral Class

F-type yellow-white

Effective Temperature

6,389 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.502 R☉

Stellar Mass

1.280 M☉

Metallicity [Fe/H]

0.15

Extended Stellar Properties

Surface gravity (log g)

4.192 dex

Stellar density

0.532 g/cm³

Systemic radial velocity

17.30 km/s

Rotational v·sin i

26.90 km/s

Activity index (log R'HK)

-4.710

Metallicity ratio

[M/H]

Distance

37.86 parsec

Light-years 123.49 ly

V-band magnitude

6.33 mag

Voyager-speed travel 2,177,726 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

26.383 mas

Total Proper Motion

250.926 mas/yr

PM Right Ascension

236.28 mas/yr

PM Declination

-84.48 mas/yr

Galactic Cartesian (pc)

x = 0.766 · y = 0.302 · z = 0.568

Equatorial (J2000)

RA 21.53785° · Dec 34.57934°

Galactic ℓ, b

131.001° · -27.748°

Ecliptic λ, β

33.296° · 23.608°

HTM-20 index

-970216672