Key parameters at a glance

A radius of 16.25 Earth radii
A mass of 3,178.28 Earth masses
Surface gravity around 12.03 g
Semi-major axis 16.5000 AU
Equilibrium temperature 1,585 K (1312 °C)
Distance from Earth 461.82 light-years
Earth Similarity Index 0.096
Travel time at Voyager 1 speed 8,144,206 years

HD 135344 A b Planet Profile

Physical Specs

Radius

16.25 R⊕

Radius (Jupiter)

1.450 R♃

Mass

3,178.28 M⊕

Mass (Jupiter)

10.000 M♃

Density

4.07 g/cm³

Surface Gravity

12.03 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.096

HZ Position Unknown

Controversial No

Discovery

Year 2025

Method Imaging

Facility Paranal Observatory

Telescope 8.2 m ESO VLT UT3 Melipal Telescope

Size rank in cohort

Rank by radius

#143of 1771

top 8.0%

This planet

16.25R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-5143 c 16.25 R⊕ Kepler-433 b 16.25 R⊕ TOI-2154 b 16.29 R⊕

Metric	Earth	HD 135344 A b	Jupiter
Radius (R⊕)	1.00	16.25	11.21
Mass (M⊕)	1.00	3,178.28	317.83
Density (g/cm³)	5.51	4.07	1.33
Surface Gravity (g)	1.00	12.03	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3,178.284 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 135344 A

TIC

TIC 307606851

Gaia DR2

Gaia DR2 6199395656645840384

Gaia DR3

Gaia DR3 6199395656645840384

System

HD 135344

Percentile among Gas Giant cohort

Radius 16.253 R⊕ · percentile 92 / cohort 1771

Mass 3,178.284 M⊕ · percentile 88 / cohort 1747

Distance 141.60 pc · percentile 43 / cohort 1759

ESI 0.096 · percentile 25 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

16.5000 AU

Eccentricity

0.500

Inclination

73.60 °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

1,585K

(1312 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.096

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Stolker et al. 2025

Instrument

SPHERE

Publication

2025-08

Observation locale

Ground

Discovery cohort

Planets confirmed in 2025 at Paranal Observatory (8 shown).

TOI-771 c · Super-Earth HD 35843 b · Sub-Neptune WISPIT 1 c · Gas Giant K2-157 d · Neptune-like WISPIT 1 b · Gas Giant WISPIT 2 b · Gas Giant K2-157 c · Neptune-like HD 143811 AB b · Gas Giant

Host System: HD 135344 A

Spectral Class

A-type white

Effective Temperature

9,540 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.500 R☉

Stellar Mass

2.320 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.416 dex

Stellar density

0.856 g/cm³

Metallicity ratio

[M/H]

Distance

141.60 parsec

Light-years 461.82 ly

V-band magnitude

7.77 mag

Voyager-speed travel 8,144,206 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

7.036 mas

Total Proper Motion

30.414 mas/yr

PM Right Ascension

-18.36 mas/yr

PM Declination

-24.25 mas/yr

Galactic Cartesian (pc)

x = -0.523 · y = -0.601 · z = -0.604

Equatorial (J2000)

RA 228.95384° · Dec -37.14892°

Galactic ℓ, b

332.397° · 17.329°

Ecliptic λ, β

236.528° · -18.357°

HTM-20 index

-807364600

Similar Worlds

TOI-1431 b

Gas Giant · A-type white

Radius 16.70 R⊕ · 485.7 ly

HIP 65426 b

Gas Giant · A-type white

Radius 16.81 R⊕ · 355.1 ly

KOI-13 b

Gas Giant · A-type white

Radius 16.95 R⊕ · 1,693.1 ly

MASCARA-4 b

Gas Giant · A-type white

Radius 16.98 R⊕ · 556.7 ly

HATS-70 b

Gas Giant · A-type white

Radius 15.51 R⊕ · 4,758.1 ly

KELT-17 b

Gas Giant · A-type white

Radius 17.09 R⊕ · 738.7 ly

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