Key parameters at a glance

A radius of 13.30 Earth radii
A mass of 787.90 Earth masses
Surface gravity around 4.45 g
An orbital period of 696.620 days
Semi-major axis 1.9120 AU
Distance from Earth 270.58 light-years
Earth Similarity Index 0.382
Travel time at Voyager 1 speed 4,771,735 years

1 sibling around 75 Cet

75 Cet b 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
75 Cet b this	Gas Giant	13.30	787.90	696.620	—	2012
75 Cet c	Gas Giant	13.90	289.86	2,051.620	—	2023

75 Cet b Planet Profile

Physical Specs

Radius

13.30 R⊕

Radius (Jupiter)

1.180 R♃

Mass

787.90 M⊕

Mass (Jupiter)

2.479 M♃

Density

1.84 g/cm³

Surface Gravity

4.45 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.382

HZ Position Unknown

Controversial No

Discovery

Year 2012

Method Radial Velocity

Facility Okayama Astrophysical Observatory

Telescope 1.88 m Telescope

Size rank in cohort

Rank by radius

#793of 1771

top 44.7%

This planet

13.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 b 13.30 R⊕ HD 129445 b 13.30 R⊕ GJ 876 b 13.30 R⊕

Metric	Earth	75 Cet b	Jupiter
Radius (R⊕)	1.00	13.30	11.21
Mass (M⊕)	1.00	787.90	317.83
Density (g/cm³)	5.51	1.84	1.33
Surface Gravity (g)	1.00	4.45	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	787.897 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 15779

HIP

HIP 11791

TIC

TIC 251095345

Gaia DR2

Gaia DR2 2500064286492779264

Gaia DR3

Gaia DR3 2500064286492779264

System

75 Cet

Percentile among Gas Giant cohort

Radius 13.300 R⊕ · percentile 53 / cohort 1771

Mass 787.897 M⊕ · percentile 61 / cohort 1747

Orbital period 696.62 d · percentile 72 / cohort 1533

Distance 82.96 pc · percentile 31 / cohort 1759

ESI 0.382 · percentile 80 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

696.620 days

Semi-major axis

1.9120 AU

Eccentricity

0.093

Inclination

— °

Year Length

A year here lasts about 1.91 Earth years on a nearly circular orbit at a mean orbital distance of 1.9120 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.382

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Sato et al. 2012

Instrument

HIDES Echelle Spectrograph

Publication

2012-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2012 at Okayama Astrophysical Observatory (5 shown).

omi UMa b · Gas Giant HD 5608 b · Gas Giant omi CrB b · Gas Giant nu Oph b · Gas Giant nu Oph c · Gas Giant

Host System: 75 Cet

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,809 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

10.380 R☉

Stellar Mass

1.920 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

2.690 dex

Systemic radial velocity

-6.21 km/s

Rotational v·sin i

1.77 km/s

Metallicity ratio

[Fe/H]

Distance

82.96 parsec

Light-years 270.58 ly

V-band magnitude

5.35 mag

Voyager-speed travel 4,771,735 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

12.026 mas

Total Proper Motion

38.564 mas/yr

PM Right Ascension

-23.62 mas/yr

PM Declination

-30.49 mas/yr

Galactic Cartesian (pc)

x = 0.787 · y = 0.616 · z = -0.018

Equatorial (J2000)

RA 38.03916° · Dec -1.03503°

Galactic ℓ, b

169.944° · -54.442°

Ecliptic λ, β

35.321° · -15.168°

HTM-20 index

-1242211277

Observation Record

Photometric series

RV measurements

Archive notes