Key parameters at a glance

A radius of 12.20 Earth radii
A mass of 5,625.56 Earth masses
Surface gravity around 37.80 g
An orbital period of 33,000.000 days
Semi-major axis 24.8000 AU
Distance from Earth 270.09 light-years
Earth Similarity Index 0.308
Travel time at Voyager 1 speed 4,763,039 years

HIP 54515 b Planet Profile

Physical Specs

Radius

12.20 R⊕

Radius (Jupiter)

1.080 R♃

Mass

5,625.56 M⊕

Mass (Jupiter)

17.700 M♃

Density

17.00 g/cm³

Surface Gravity

37.80 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.308

HZ Position Unknown

Controversial No

Discovery

Year 2026

Method Imaging

Facility Subaru Telescope

Telescope 8.2 m Subaru Telescope

Size rank in cohort

Rank by radius

#1410of 1771

top 79.6%

This planet

12.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

FU Tau b 12.20 R⊕ HD 168443 c 12.20 R⊕ HIP 5158 c 12.20 R⊕

Metric	Earth	HIP 54515 b	Jupiter
Radius (R⊕)	1.00	12.20	11.21
Mass (M⊕)	1.00	5,625.56	317.83
Density (g/cm³)	5.51	17.00	1.33
Surface Gravity (g)	1.00	37.80	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	5,625.563 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 96855

HIP

HIP 54515

TIC

TIC 62903306

Gaia DR2

Gaia DR2 3791464504614567040

Gaia DR3

Gaia DR3 3791464504614567040

System

HIP 54515

Percentile among Gas Giant cohort

Radius 12.200 R⊕ · percentile 19 / cohort 1771

Mass 5,625.563 M⊕ · percentile 95 / cohort 1747

Orbital period 33,000.00 d · percentile 99 / cohort 1533

Distance 82.81 pc · percentile 31 / cohort 1759

ESI 0.308 · percentile 61 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

33,000.000 days

Semi-major axis

24.8000 AU

Eccentricity

0.420

Inclination

129.60 °

Year Length

A year here lasts about 90.35 Earth years on a highly eccentric trajectory at a mean orbital distance of 24.8000 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.308

0 = alien, 1 = Earth-identical

Detection Signatures

Astrometry

Positional wobble of the host star was measured.

Direct imaging

The planet has been imaged directly (rare).

Discovery Paper

Primary reference

Currie et al. 2026

Instrument

Subaru Coronagraphic Extreme Adaptive Optics (SCExAO)

Publication

2026-01

Observation locale

Ground

Host System: HIP 54515

Spectral Class

A-type white

Effective Temperature

8,100 K — hotter than the Sun (5,778 K)

Estimated Age

0.12 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.649 R☉

Stellar Mass

1.900 M☉

Metallicity [Fe/H]

—

Distance

82.81 parsec

Light-years 270.09 ly

V-band magnitude

6.81 mag

Voyager-speed travel 4,763,039 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

12.047 mas

Total Proper Motion

65.775 mas/yr

PM Right Ascension

-65.52 mas/yr

PM Declination

-5.77 mas/yr

Galactic Cartesian (pc)

x = -0.975 · y = 0.220 · z = -0.023

Equatorial (J2000)

RA 167.30663° · Dec -1.33328°

Galactic ℓ, b

257.982° · 52.383°

Ecliptic λ, β

168.843° · -6.242°

HTM-20 index

807906224

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KIC 7917485 b

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Radius 12.40 R⊕ · 4,510.4 ly

AB Aur b

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Radius 12.50 R⊕ · 528.8 ly

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Radius 12.50 R⊕ · 64.4 ly

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