Key parameters at a glance

A radius of 17.93 Earth radii
A mass of 1,541.47 Earth masses
Surface gravity around 4.79 g
Semi-major axis 57.0000 AU
Distance from Earth 440.01 light-years
Earth Similarity Index 0.327
Travel time at Voyager 1 speed 7,759,528 years

1 sibling around WISPIT 2

WISPIT 2 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 2 b this	Gas Giant	17.93	1,541.47	—	—	2025
WISPIT 2 c	Gas Giant	17.93	3,178.28	—	2,050	2026

WISPIT 2 b Planet Profile

Physical Specs

Radius

17.93 R⊕

Radius (Jupiter)

1.600 R♃

Mass

1,541.47 M⊕

Mass (Jupiter)

4.850 M♃

Density

1.47 g/cm³

Surface Gravity

4.79 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.327

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

#76of 1771

top 4.2%

This planet

17.93R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

WISPIT 2 c 17.93 R⊕ KELT-7 b 17.93 R⊕ WASP-93 b 17.90 R⊕

Metric	Earth	WISPIT 2 b	Jupiter
Radius (R⊕)	1.00	17.93	11.21
Mass (M⊕)	1.00	1,541.47	317.83
Density (g/cm³)	5.51	1.47	1.33
Surface Gravity (g)	1.00	4.79	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,541.468 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 98898373

Gaia DR2

Gaia DR2 4207586980945067648

Gaia DR3

Gaia DR3 4207586980945067648

System

WISPIT 2

Percentile among Gas Giant cohort

Radius 17.934 R⊕ · percentile 96 / cohort 1771

Mass 1,541.468 M⊕ · percentile 75 / cohort 1747

Distance 134.91 pc · percentile 41 / cohort 1759

ESI 0.327 · percentile 65 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

57.0000 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)

0.327

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Van Capelleveen et al. 2025

Instrument

SPHERE

Publication

2025-09

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

Host System: WISPIT 2

Spectral Class

K-type orange

Effective Temperature

4,400 K — cooler than the Sun (5,778 K)

Estimated Age

0.01 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.418 R☉

Stellar Mass

1.080 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.000 dex

Stellar density

0.467 g/cm³

Rotation period

4.70 days

Distance

134.91 parsec

Light-years 440.01 ly

V-band magnitude

11.60 mag

Voyager-speed travel 7,759,528 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

7.388 mas

Total Proper Motion

27.572 mas/yr

PM Right Ascension

6.79 mas/yr

PM Declination

-26.72 mas/yr

Galactic Cartesian (pc)

x = 0.352 · y = -0.926 · z = -0.134

Equatorial (J2000)

RA 290.82100° · Dec -7.68208°

Galactic ℓ, b

29.644° · -10.551°

Ecliptic λ, β

291.306° · 14.230°

HTM-20 index

1811606766

Similar Worlds

WISPIT 2 c

Gas Giant · K-type orange

Radius 17.93 R⊕ · 440.0 ly

WASP-177 b

Gas Giant · K-type orange

Radius 17.71 R⊕ · 576.7 ly

1RXS J160929.1-210524 b

Gas Giant · K-type orange

Radius 18.65 R⊕ · 453.8 ly

TOI-5143 c

Gas Giant · K-type orange

Radius 16.25 R⊕ · 591.6 ly

TOI-2669 b

Gas Giant · K-type orange

Radius 19.73 R⊕ · 1,283.2 ly

GSC 06214-00210 b

Gas Giant · K-type orange

Radius 20.18 R⊕ · 353.9 ly

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