Key parameters at a glance

A radius of 13.79 Earth radii
A mass of 7,024.01 Earth masses
Surface gravity around 36.95 g
An orbital period of 0.236 days
Distance from Earth 608.90 light-years
Earth Similarity Index 0.238
Travel time at Voyager 1 speed 10,737,962 years

ZTF J1230-2655 b Planet Profile

Physical Specs

Radius

13.79 R⊕

Radius (Jupiter)

1.230 R♃

Mass

7,024.01 M⊕

Mass (Jupiter)

22.100 M♃

Density

— g/cm³

Surface Gravity

36.95 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.238

HZ Position Unknown

Controversial No

Discovery

Year 2025

Method Transit

Facility Zwicky Transient Facility

Telescope 48-inch (1.2 m) Samuel Oschin telescope

Size rank in cohort

Rank by radius

#546of 1771

top 30.8%

This planet

13.79R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

WASP-38 b 13.79 R⊕ WASP-192 b 13.79 R⊕ HATS-33 b 13.79 R⊕

Metric	Earth	ZTF J1230-2655 b	Jupiter
Radius (R⊕)	1.00	13.79	11.21
Mass (M⊕)	1.00	7,024.01	317.83
Density (g/cm³)	5.51	—	1.33
Surface Gravity (g)	1.00	36.95	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	7,024.008 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 951438622

Gaia DR2

Gaia DR2 3475360576690175616

Gaia DR3

Gaia DR3 3475360576690175616

System

ZTF J1230-2655

Percentile among Gas Giant cohort

Radius 13.787 R⊕ · percentile 69 / cohort 1771

Mass 7,024.008 M⊕ · percentile 98 / cohort 1747

Orbital period 0.24 d · percentile 0 / cohort 1533

Distance 186.69 pc · percentile 49 / cohort 1759

ESI 0.238 · percentile 42 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

0.236 days

Semi-major axis

— AU

Eccentricity

—

Inclination

86.70 °

Year Length

A year here lasts roughly 5.7 hours long.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.238

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Parsons et al. 2025

Instrument

CCD

Publication

2025-02

Observation locale

ground

Host System: ZTF J1230-2655

Spectral Class

B-type blue-white

Effective Temperature

10,000 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.012 R☉

Stellar Mass

0.646 M☉

Metallicity [Fe/H]

—

Distance

186.69 parsec

Light-years 608.90 ly

V-band magnitude

18.91 mag

Voyager-speed travel 10,737,962 yr

Astrometric Data

Parallax

5.376 mas

Total Proper Motion

42.888 mas/yr

PM Right Ascension

-42.20 mas/yr

PM Declination

-7.67 mas/yr

Galactic Cartesian (pc)

x = -0.884 · y = -0.117 · z = -0.453

Equatorial (J2000)

RA 187.56893° · Dec -26.93096°

Galactic ℓ, b

297.122° · 35.702°

Ecliptic λ, β

198.040° · -21.643°

HTM-20 index

-1526325364

Similar Worlds

Kepler-451 c

Gas Giant · B-type blue-white

Radius 13.50 R⊕ · 1,292.7 ly

Kepler-451 d

Gas Giant · B-type blue-white

Radius 13.50 R⊕ · 1,292.7 ly

2MASS J19383260+4603591 b

Gas Giant · B-type blue-white

Radius 13.40 R⊕ · 1,292.7 ly

HD 97048 b

Gas Giant · B-type blue-white

Radius 13.30 R⊕ · 599.7 ly

V0391 Peg b

Gas Giant · B-type blue-white

Radius 13.10 R⊕ · 3,900.8 ly

DP Leo b

Gas Giant · B-type blue-white

Radius 12.70 R⊕ · 997.0 ly

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