Key parameters at a glance

A radius of 14.20 Earth radii
A mass of 155.74 Earth masses
Surface gravity around 0.77 g
An orbital period of 3.509 days
Semi-major axis 0.0500 AU
Equilibrium temperature 1,260 K (987 °C)
Distance from Earth 94.96 light-years
Earth Similarity Index 0.090
Travel time at Voyager 1 speed 1,674,671 years

HD 75289 b Planet Profile

Physical Specs

Radius

14.20 R⊕

Radius (Jupiter)

1.270 R♃

Mass

155.74 M⊕

Mass (Jupiter)

0.490 M♃

Density

0.30 g/cm³

Surface Gravity

0.77 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.090

HZ Position Unknown

Controversial No

Discovery

Year 1999

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#334of 1771

top 18.8%

This planet

14.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

OGLE-2011-BLG-0251L b 14.20 R⊕ HIP 57274 c 14.20 R⊕ HD 187123 b 14.20 R⊕

Metric	Earth	HD 75289 b	Jupiter
Radius (R⊕)	1.00	14.20	11.21
Mass (M⊕)	1.00	155.74	317.83
Density (g/cm³)	5.51	0.30	1.33
Surface Gravity (g)	1.00	0.77	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	155.737 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 75289

HIP

HIP 43177

TIC

TIC 181741837

Gaia DR2

Gaia DR2 5524982093479504384

Gaia DR3

Gaia DR3 5524982093479504384

System

HD 75289

Percentile among Gas Giant cohort

Radius 14.200 R⊕ · percentile 79 / cohort 1771

Mass 155.737 M⊕ · percentile 13 / cohort 1747

Orbital period 3.51 d · percentile 23 / cohort 1533

Distance 29.12 pc · percentile 7 / cohort 1759

ESI 0.090 · percentile 23 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.509 days

Semi-major axis

0.0500 AU

Eccentricity

0.030

Inclination

— °

Year Length

A year here lasts approximately 3.51 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0500 AU.

Eq. Temperature

1,260K

(987 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.090

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Udry et al. 2000

Instrument

CORALIE Spectrograph

Publication

2000-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 1999 at La Silla Observatory (4 shown).

HR 810 b · Gas Giant GJ 86 b · Gas Giant HD 192263 b · Gas Giant HD 130322 b · Gas Giant

Host System: HD 75289

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

6,117 K — hotter than the Sun (5,778 K)

Estimated Age

5.60 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.230 R☉

Stellar Mass

1.290 M☉

Metallicity [Fe/H]

0.26

Extended Stellar Properties

Surface gravity (log g)

4.370 dex

Stellar density

0.713 g/cm³

Systemic radial velocity

8.90 km/s

Rotational v·sin i

4.37 km/s

Activity index (log R'HK)

-5.000

Metallicity ratio

[Fe/H]

Distance

29.12 parsec

Light-years 94.96 ly

V-band magnitude

6.35 mag

Voyager-speed travel 1,674,671 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

34.317 mas

Total Proper Motion

228.866 mas/yr

PM Right Ascension

-20.51 mas/yr

PM Declination

-227.95 mas/yr

Galactic Cartesian (pc)

x = -0.499 · y = 0.555 · z = -0.666

Equatorial (J2000)

RA 131.91817° · Dec -41.73777°

Galactic ℓ, b

262.210° · 1.089°

Ecliptic λ, β

153.859° · -56.269°

HTM-20 index

-1095569240

Observation Record

Photometric series

RV measurements

Archive notes