Key parameters at a glance

A radius of 13.80 Earth radii
A mass of 324.19 Earth masses
Surface gravity around 1.70 g
An orbital period of 3.415 days
Semi-major axis 0.0479 AU
Distance from Earth 240.09 light-years
Earth Similarity Index 0.310
Travel time at Voyager 1 speed 4,234,003 years

HD 88133 b Planet Profile

Physical Specs

Radius

13.80 R⊕

Radius (Jupiter)

1.230 R♃

Mass

324.19 M⊕

Mass (Jupiter)

1.020 M♃

Density

0.68 g/cm³

Surface Gravity

1.70 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.310

HZ Position Unknown

Controversial No

Discovery

Year 2004

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 88133 b	Jupiter
Radius (R⊕)	1.00	13.80	11.21
Mass (M⊕)	1.00	324.19	317.83
Density (g/cm³)	5.51	0.68	1.33
Surface Gravity (g)	1.00	1.70	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	324.187 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	90.423 M⊕	Lower bound from radial-velocity fitting.
Computed mass	331.560 M⊕	Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

HD 88133

HIP

HIP 49813

TIC

TIC 27073220

Gaia DR2

Gaia DR2 623408253837371392

Gaia DR3

Gaia DR3 623408253837371392

System

HD 88133

Percentile among Gas Giant cohort

Radius 13.800 R⊕ · percentile 70 / cohort 1771

Mass 324.187 M⊕ · percentile 36 / cohort 1747

Orbital period 3.41 d · percentile 22 / cohort 1533

Distance 73.61 pc · percentile 29 / cohort 1759

ESI 0.310 · percentile 61 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.415 days

Semi-major axis

0.0479 AU

Eccentricity

0.031

Inclination

15.00 °

Year Length

A year here lasts approximately 3.41 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0479 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.310

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Fischer et al. 2005

Instrument

HIRES Spectrometer

Publication

2005-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2004 at W. M. Keck Observatory (6 shown).

HD 99492 b · Neptune-like HD 183263 b · Gas Giant HD 117207 b · Gas Giant HD 45350 b · Gas Giant HD 188015 b · Gas Giant GJ 436 b · Neptune-like

Host System: HD 88133

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,392 K — cooler than the Sun (5,778 K)

Estimated Age

5.37 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

2.200 R☉

Stellar Mass

1.260 M☉

Metallicity [Fe/H]

0.34

Extended Stellar Properties

Surface gravity (log g)

3.880 dex

Stellar density

0.158 g/cm³

Systemic radial velocity

-3.45 km/s

Rotational v·sin i

2.20 km/s

Metallicity ratio

[Fe/H]

Distance

73.61 parsec

Light-years 240.09 ly

V-band magnitude

8.02 mag

Voyager-speed travel 4,234,003 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

13.556 mas

Total Proper Motion

265.391 mas/yr

PM Right Ascension

-11.08 mas/yr

PM Declination

-265.16 mas/yr

Galactic Cartesian (pc)

x = -0.843 · y = 0.438 · z = 0.312

Equatorial (J2000)

RA 152.53193° · Dec 18.18573°

Galactic ℓ, b

217.812° · 51.898°

Ecliptic λ, β

148.022° · 6.433°

HTM-20 index

-1502212278

Observation Record

Photometric series

RV measurements

Stellar spectra