Key parameters at a glance

A radius of 12.40 Earth radii
A mass of 3,305.42 Earth masses
Surface gravity around 21.50 g
Semi-major axis 338.0000 AU
Distance from Earth 750.18 light-years
Earth Similarity Index 0.377
Travel time at Voyager 1 speed 13,229,452 years

1 sibling around WISPIT 1

WISPIT 1 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
WISPIT 1 b this	Gas Giant	12.40	3,305.42	—	—	2025
WISPIT 1 c	Gas Giant	12.80	1,684.49	—	—	2025

brightness_6

Circumbinary planet

WISPIT 1 b orbits a binary-star pair rather than a single host — a minority architecture in the confirmed catalogue.

WISPIT 1 b Planet Profile

Physical Specs

Radius

12.40 R⊕

Radius (Jupiter)

1.110 R♃

Mass

3,305.42 M⊕

Mass (Jupiter)

10.400 M♃

Density

9.53 g/cm³

Surface Gravity

21.50 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.377

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

#1298of 1771

top 73.2%

This planet

12.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 110014 b 12.40 R⊕ CFBDSIR J145829+101343 b 12.40 R⊕ MOA-2010-BLG-073L b 12.40 R⊕

Metric	Earth	WISPIT 1 b	Jupiter
Radius (R⊕)	1.00	12.40	11.21
Mass (M⊕)	1.00	3,305.42	317.83
Density (g/cm³)	5.51	9.53	1.33
Surface Gravity (g)	1.00	21.50	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3,305.415 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 268764100

Gaia DR2

Gaia DR2 5517037434775143808

Gaia DR3

Gaia DR3 5517037434775143808

System

WISPIT 1

Percentile among Gas Giant cohort

Radius 12.400 R⊕ · percentile 25 / cohort 1771

Mass 3,305.415 M⊕ · percentile 88 / cohort 1747

Distance 230.01 pc · percentile 54 / cohort 1759

ESI 0.377 · percentile 78 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

338.0000 AU

Eccentricity

—

Inclination

— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.377

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Van Capelleveen 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 2 b · Gas Giant K2-157 c · Neptune-like HD 143811 AB b · Gas Giant HD 135344 A b · Gas Giant

Host System: WISPIT 1

Spectral Class

K-type orange

Effective Temperature

4,670 K — cooler than the Sun (5,778 K)

Estimated Age

0.02 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.116 R☉

Stellar Mass

0.720 M☉

Metallicity [Fe/H]

—

Distance

230.01 parsec

Light-years 750.18 ly

V-band magnitude

13.18 mag

Voyager-speed travel 13,229,452 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

4.319 mas

Total Proper Motion

24.177 mas/yr

PM Right Ascension

-19.81 mas/yr

PM Declination

13.85 mas/yr

Galactic Cartesian (pc)

x = -0.299 · y = 0.567 · z = -0.768

Equatorial (J2000)

RA 117.79856° · Dec -50.13769°

Galactic ℓ, b

263.701° · -11.710°

Ecliptic λ, β

144.287° · -68.400°

HTM-20 index

-962305760

Similar Worlds

HD 87816 c

Gas Giant · K-type orange

Radius 12.40 R⊕ · 434.5 ly

HD 95127 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 2,206.7 ly

HD 16905 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 129.6 ly

Gaia-4 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 239.7 ly

HD 110014 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 328.6 ly

TYC 4282-00605-1 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 1,513.8 ly

Explore Related Categories

Gas Giant Planets Imaging Discoveries Paranal Observatory Mission K-type orange Hosts