Key parameters at a glance

A radius of 13.60 Earth radii
A mass of 425.89 Earth masses
Surface gravity around 2.30 g
An orbital period of 555.100 days
Semi-major axis 1.3200 AU
Distance from Earth 134.74 light-years
Earth Similarity Index 0.333
Travel time at Voyager 1 speed 2,376,093 years

gam Psc b Planet Profile

Physical Specs

Radius

13.60 R⊕

Radius (Jupiter)

1.220 R♃

Mass

425.89 M⊕

Mass (Jupiter)

1.340 M♃

Density

0.93 g/cm³

Surface Gravity

2.30 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.333

HZ Position Unknown

Controversial No

Discovery

Year 2021

Method Radial Velocity

Facility Okayama Astrophysical Observatory

Telescope 1.88 m 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	gam Psc b	Jupiter
Radius (R⊕)	1.00	13.60	11.21
Mass (M⊕)	1.00	425.89	317.83
Density (g/cm³)	5.51	0.93	1.33
Surface Gravity (g)	1.00	2.30	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	425.890 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 262691761

Gaia DR2

Gaia DR2 2658974606110545536

Gaia DR3

Gaia DR3 2658974606111711488

System

gam Psc

Percentile among Gas Giant cohort

Radius 13.600 R⊕ · percentile 63 / cohort 1771

Mass 425.890 M⊕ · percentile 44 / cohort 1747

Orbital period 555.10 d · percentile 69 / cohort 1533

Distance 41.31 pc · percentile 15 / cohort 1759

ESI 0.333 · percentile 66 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

555.100 days

Semi-major axis

1.3200 AU

Eccentricity

0.204

Inclination

— °

Year Length

A year here lasts about 1.52 Earth years on a mildly elliptical path at a mean orbital distance of 1.3200 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.333

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Teng et al. 2021

Instrument

HIDES Echelle Spectrograph

Publication

2021-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at Okayama Astrophysical Observatory (7 shown).

HD 99283 b · Gas Giant HD 219139 b · Gas Giant HD 360 b · Gas Giant HD 79181 b · Gas Giant HD 161178 b · Gas Giant ups Leo b · Gas Giant HD 10975 b · Gas Giant

Host System: gam Psc

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,742 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

11.200 R☉

Stellar Mass

0.990 M☉

Metallicity [Fe/H]

-0.62

Extended Stellar Properties

Surface gravity (log g)

2.330 dex

Rotational v·sin i

1.67 km/s

Metallicity ratio

[Fe/H]

Distance

41.31 parsec

Light-years 134.74 ly

V-band magnitude

3.69 mag

Voyager-speed travel 2,376,093 yr

Multi-band Host Photometry — 7 bands

Astrometric Data

Parallax

24.190 mas

Total Proper Motion

760.493 mas/yr

PM Right Ascension

760.27 mas/yr

PM Declination

18.58 mas/yr

Galactic Cartesian (pc)

x = 0.981 · y = -0.185 · z = 0.057

Equatorial (J2000)

RA 349.29468° · Dec 3.28237°

Galactic ℓ, b

82.487° · -52.029°

Ecliptic λ, β

351.452° · 7.256°

HTM-20 index

-759198563