Key parameters at a glance

A radius of 13.60 Earth radii
A mass of 464.03 Earth masses
Surface gravity around 2.51 g
An orbital period of 3.986 days
Semi-major axis 0.0435 AU
Distance from Earth 122.83 light-years
Earth Similarity Index 0.339
Travel time at Voyager 1 speed 2,166,136 years
Almost certainly tidally locked to its host star given the close orbit

HS Psc b Planet Profile

Physical Specs

Radius

13.60 R⊕

Radius (Jupiter)

1.210 R♃

Mass

464.03 M⊕

Mass (Jupiter)

1.460 M♃

Density

1.01 g/cm³

Surface Gravity

2.51 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.339

HZ Position Unknown

Controversial No

Discovery

Year 2024

Method Radial Velocity

Facility McDonald Observatory

Telescope 9.2 m Hobby-Eberly Telescope

Size rank in cohort

Rank by radius

#609of 1771

top 34.3%

This planet

13.60R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 19994 b 13.60 R⊕ HD 205739 b 13.60 R⊕ HD 79498 b 13.60 R⊕

Metric	Earth	HS Psc b	Jupiter
Radius (R⊕)	1.00	13.60	11.21
Mass (M⊕)	1.00	464.03	317.83
Density (g/cm³)	5.51	1.01	1.33
Surface Gravity (g)	1.00	2.51	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	464.029 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 353804063

Gaia DR2

Gaia DR2 295713102534550272

Gaia DR3

Gaia DR3 295713106830535424

System

HS Psc

Percentile among Gas Giant cohort

Radius 13.600 R⊕ · percentile 63 / cohort 1771

Mass 464.029 M⊕ · percentile 46 / cohort 1747

Orbital period 3.99 d · percentile 29 / cohort 1533

Distance 37.66 pc · percentile 12 / cohort 1759

ESI 0.339 · percentile 68 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.986 days

Semi-major axis

0.0435 AU

Eccentricity

0.270

Inclination

— °

Year Length

A year here lasts approximately 3.99 Earth days (1.1% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0435 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

268.000 m/s

Transit mid-time (BJD)

2,458,486.4220

Long. of periastron (ω)

176.25°

Angular separation (arcsec)

1.16000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.339

0 = alien, 1 = Earth-identical

Insufficient insolation data. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Tran et al. 2024

Instrument

Habitable Zone Planet Finder (HPF) spectrograph

Publication

2024-03

Observation locale

Ground

Host System: HS Psc

Spectral Class

K-type orange

Effective Temperature

4,203 K — cooler than the Sun (5,778 K)

Estimated Age

0.13 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.650 R☉

Stellar Mass

0.690 M☉

Metallicity [Fe/H]

-0.05

Extended Stellar Properties

Surface gravity (log g)

4.660 dex

Stellar density

3.437 g/cm³

Rotational v·sin i

29.70 km/s

Rotation period

1.09 days

Metallicity ratio

[Fe/H]

Distance

37.66 parsec

Light-years 122.83 ly

V-band magnitude

10.77 mag

Voyager-speed travel 2,166,136 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

26.524 mas

Total Proper Motion

174.038 mas/yr

PM Right Ascension

118.36 mas/yr

PM Declination

-127.60 mas/yr

Galactic Cartesian (pc)

x = 0.812 · y = 0.367 · z = 0.453

Equatorial (J2000)

RA 24.34738° · Dec 26.95280°

Galactic ℓ, b

135.418° · -34.802°

Ecliptic λ, β

32.501° · 15.645°

HTM-20 index

547796854

Similar Worlds

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HD 10442 b

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Radius 13.60 R⊕ · 441.5 ly

HD 83443 c

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Radius 13.60 R⊕ · 133.4 ly

HD 141399 c

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Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries McDonald Observatory Mission K-type orange Hosts