Key parameters at a glance

A radius of 13.00 Earth radii
A mass of 1,147.36 Earth masses
Surface gravity around 6.79 g
An orbital period of 8,905.000 days
Semi-major axis 8.9960 AU
Equilibrium temperature 1,400 K (1127 °C)
Distance from Earth 87.59 light-years
Earth Similarity Index 0.115
Travel time at Voyager 1 speed 1,544,716 years

AF Lep b Planet Profile

Physical Specs

Radius

13.00 R⊕

Radius (Jupiter)

1.160 R♃

Mass

1,147.36 M⊕

Mass (Jupiter)

3.610 M♃

Density

2.87 g/cm³

Surface Gravity

6.79 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.115

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Imaging

Facility Paranal Observatory

Telescope 8.2 m ESO VLT UT3 Melipal Telescope

Size rank in cohort

Rank by radius

#960of 1771

top 54.2%

This planet

13.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HIP 14810 b 13.00 R⊕ HD 47186 c 13.00 R⊕ WASP-107 c 13.00 R⊕

Metric	Earth	AF Lep b	Jupiter
Radius (R⊕)	1.00	13.00	11.21
Mass (M⊕)	1.00	1,147.36	317.83
Density (g/cm³)	5.51	2.87	1.33
Surface Gravity (g)	1.00	6.79	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,147.361 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 35850

HIP

HIP 25486

TIC

TIC 94945758

Gaia DR2

Gaia DR2 3009908378049913216

Gaia DR3

Gaia DR3 3009908378049913216

System

AF Lep

Percentile among Gas Giant cohort

Radius 13.000 R⊕ · percentile 43 / cohort 1771

Mass 1,147.361 M⊕ · percentile 70 / cohort 1747

Orbital period 8,905.00 d · percentile 95 / cohort 1533

Distance 26.86 pc · percentile 6 / cohort 1759

ESI 0.115 · percentile 30 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

8,905.000 days

Semi-major axis

8.9960 AU

Eccentricity

0.015

Inclination

57.50 °

Year Length

A year here lasts about 24.38 Earth years on a nearly circular orbit at a mean orbital distance of 8.9960 AU.

Eq. Temperature

1,400K

(1127 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.115

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Detection Signatures

Astrometry

Positional wobble of the host star was measured.

Direct imaging

The planet has been imaged directly (rare).

Discovery Paper

Primary reference

Mesa et al. 2023

Instrument

SPHERE

Publication

2023-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2023 at Paranal Observatory (5 shown).

L 363-38 b · Sub-Neptune HD 169142 b · Gas Giant HIP 29442 d · Super-Earth HIP 29442 c · Super-Earth HIP 81208 C b · Gas Giant

Host System: AF Lep

Spectral Class

F-type yellow-white

Effective Temperature

6,140 K — hotter than the Sun (5,778 K)

Estimated Age

0.02 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.250 R☉

Stellar Mass

1.218 M☉

Metallicity [Fe/H]

0.19

Extended Stellar Properties

Surface gravity (log g)

4.400 dex

Stellar density

1.454 g/cm³

Systemic radial velocity

22.80 km/s

Rotational v·sin i

54.70 km/s

Rotation period

0.97 days

Activity index (log R'HK)

-4.270

Metallicity ratio

[Fe/H]

Distance

26.86 parsec

Light-years 87.59 ly

V-band magnitude

6.33 mag

Voyager-speed travel 1,544,716 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

37.206 mas

Total Proper Motion

52.182 mas/yr

PM Right Ascension

17.06 mas/yr

PM Declination

-49.31 mas/yr

Galactic Cartesian (pc)

x = 0.140 · y = 0.968 · z = -0.206

Equatorial (J2000)

RA 81.76992° · Dec -11.90118°

Galactic ℓ, b

214.374° · -24.041°

Ecliptic λ, β

80.143° · -35.059°

HTM-20 index

-1845960235

Observation Record

Photometric series

Stellar spectra

Archive notes