Key parameters at a glance

A radius of 13.90 Earth radii
A mass of 289.86 Earth masses
Surface gravity around 1.50 g
An orbital period of 2,051.620 days
Semi-major axis 3.9290 AU
Distance from Earth 270.58 light-years
Earth Similarity Index 0.300
Travel time at Voyager 1 speed 4,771,735 years

1 sibling around 75 Cet

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

75 Cet c Planet Profile

Physical Specs

Radius

13.90 R⊕

Radius (Jupiter)

1.240 R♃

Mass

289.86 M⊕

Mass (Jupiter)

0.912 M♃

Density

0.59 g/cm³

Surface Gravity

1.50 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.300

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Radial Velocity

Facility Okayama Astrophysical Observatory

Telescope 1.88 m Telescope

Size rank in cohort

Rank by radius

#456of 1771

top 25.7%

This planet

13.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

24 Sex c 13.90 R⊕ HD 148156 b 13.90 R⊕ HD 134987 c 13.90 R⊕

Metric	Earth	75 Cet c	Jupiter
Radius (R⊕)	1.00	13.90	11.21
Mass (M⊕)	1.00	289.86	317.83
Density (g/cm³)	5.51	0.59	1.33
Surface Gravity (g)	1.00	1.50	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	289.860 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 13.900 R⊕ · percentile 72 / cohort 1771

Mass 289.860 M⊕ · percentile 32 / cohort 1747

Orbital period 2,051.62 d · percentile 85 / cohort 1533

Distance 82.96 pc · percentile 31 / cohort 1759

ESI 0.300 · percentile 58 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2,051.620 days

Semi-major axis

3.9290 AU

Eccentricity

0.023

Inclination

— °

Year Length

A year here lasts about 5.62 Earth years on a nearly circular orbit at a mean orbital distance of 3.9290 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.300

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Teng et al. 2023

Instrument

HIDES Echelle Spectrograph

Publication

2023-08

Observation locale

Ground

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