Key parameters at a glance

A radius of 11.90 Earth radii
A mass of 8,581.37 Earth masses
Surface gravity around 60.60 g
An orbital period of 44,000.000 days
Semi-major axis 27.0000 AU
Distance from Earth 153.50 light-years
Earth Similarity Index 0.255
Travel time at Voyager 1 speed 2,707,055 years

PZ Tel b Planet Profile

Physical Specs

Radius

11.90 R⊕

Radius (Jupiter)

1.070 R♃

Mass

8,581.37 M⊕

Mass (Jupiter)

27.000 M♃

Density

28.00 g/cm³

Surface Gravity

60.60 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.255

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Imaging

Facility W. M. Keck Observatory

Telescope 10 m Keck II Telescope

Size rank in cohort

Rank by radius

#1526of 1771

top 86.1%

This planet

11.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

2MASS J22501512+2325342 b 11.90 R⊕ KMT-2020-BLG-0414L c 11.90 R⊕ DENIS-P J082303.1-491201 b 11.90 R⊕

Metric	Earth	PZ Tel b	Jupiter
Radius (R⊕)	1.00	11.90	11.21
Mass (M⊕)	1.00	8,581.37	317.83
Density (g/cm³)	5.51	28.00	1.33
Surface Gravity (g)	1.00	60.60	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	8,581.367 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 174429

HIP

HIP 92680

TIC

TIC 406095880

Gaia DR2

Gaia DR2 6655168686921108864

Gaia DR3

Gaia DR3 6655168686921108864

System

PZ Tel

Percentile among Gas Giant cohort

Radius 11.900 R⊕ · percentile 13 / cohort 1771

Mass 8,581.367 M⊕ · percentile 99 / cohort 1747

Orbital period 44,000.00 d · percentile 99 / cohort 1533

Distance 47.06 pc · percentile 18 / cohort 1759

ESI 0.255 · percentile 46 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

44,000.000 days

Semi-major axis

27.0000 AU

Eccentricity

0.520

Inclination

91.73 °

Year Length

A year here lasts about 120.47 Earth years on a highly eccentric trajectory at a mean orbital distance of 27.0000 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.255

0 = alien, 1 = Earth-identical

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

Direct imaging

The planet has been imaged directly (rare).

Discovery Paper

Primary reference

Franson & Bowler 2023

Instrument

NIRC2 Camera

Publication

2023-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2023 at W. M. Keck Observatory (5 shown).

Kepler-100 e · Neptune-like Kepler-139 e · Gas Giant Kepler-48 f · Gas Giant TOI-1694 c · Gas Giant TOI-1669 b · Gas Giant

Host System: PZ Tel

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,169 K — cooler than the Sun (5,778 K)

Estimated Age

0.20 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.256 R☉

Stellar Mass

1.360 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.184 dex

Stellar density

0.625 g/cm³

Rotational v·sin i

73.00 km/s

Distance

47.06 parsec

Light-years 153.50 ly

V-band magnitude

8.43 mag

Voyager-speed travel 2,707,055 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

21.219 mas

Total Proper Motion

86.807 mas/yr

PM Right Ascension

16.35 mas/yr

PM Declination

-85.25 mas/yr

Galactic Cartesian (pc)

x = 0.147 · y = -0.623 · z = -0.768

Equatorial (J2000)

RA 283.27458° · Dec -50.18090°

Galactic ℓ, b

346.151° · -20.754°

Ecliptic λ, β

279.510° · -27.179°

HTM-20 index

-1660510800