Key parameters at a glance

A radius of 12.80 Earth radii
A mass of 1,684.49 Earth masses
Surface gravity around 10.28 g
Semi-major axis 840.0000 AU
Distance from Earth 750.18 light-years
Earth Similarity Index 0.433
Travel time at Voyager 1 speed 13,229,452 years

1 sibling around WISPIT 1

WISPIT 1 c 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 c this	Gas Giant	12.80	1,684.49	—	—	2025
WISPIT 1 b	Gas Giant	12.40	3,305.42	—	—	2025

brightness_6

Circumbinary planet

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

WISPIT 1 c Planet Profile

Physical Specs

Radius

12.80 R⊕

Radius (Jupiter)

1.140 R♃

Mass

1,684.49 M⊕

Mass (Jupiter)

5.300 M♃

Density

4.41 g/cm³

Surface Gravity

10.28 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.433

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

#1063of 1771

top 60.0%

This planet

12.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 240210 b 12.80 R⊕ HD 29985 b 12.80 R⊕ HD 148164 c 12.80 R⊕

Metric	Earth	WISPIT 1 c	Jupiter
Radius (R⊕)	1.00	12.80	11.21
Mass (M⊕)	1.00	1,684.49	317.83
Density (g/cm³)	5.51	4.41	1.33
Surface Gravity (g)	1.00	10.28	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,684.491 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 12.800 R⊕ · percentile 37 / cohort 1771

Mass 1,684.491 M⊕ · percentile 76 / cohort 1747

Distance 230.01 pc · percentile 54 / cohort 1759

ESI 0.433 · percentile 95 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

840.0000 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)

0.433

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 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 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 99706 c

Gas Giant · K-type orange

Radius 12.80 R⊕ · 478.1 ly

HD 135872 b

Gas Giant · K-type orange

Radius 12.80 R⊕ · 268.8 ly

WASP-132 d

Gas Giant · K-type orange

Radius 12.80 R⊕ · 400.9 ly

gam Lib c

Gas Giant · K-type orange

Radius 12.80 R⊕ · 154.6 ly

HD 240210 b

Gas Giant · K-type orange

Radius 12.80 R⊕ · 1,214.6 ly

Kepler-56 d

Gas Giant · K-type orange

Radius 12.80 R⊕ · 2,977.8 ly

Explore Related Categories

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