Key parameters at a glance

A radius of 12.00 Earth radii
A mass of 7,627.88 Earth masses
Surface gravity around 52.97 g
An orbital period of 22,000.000 days
Semi-major axis 17.0000 AU
Equilibrium temperature 1,300 K (1027 °C)
Distance from Earth 141.58 light-years
Earth Similarity Index 0.091
Travel time at Voyager 1 speed 2,496,684 years

HIP 21152 b Planet Profile

Physical Specs

Radius

12.00 R⊕

Radius (Jupiter)

1.070 R♃

Mass

7,627.88 M⊕

Mass (Jupiter)

24.000 M♃

Density

24.30 g/cm³

Surface Gravity

52.97 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.091

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Imaging

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1494of 1771

top 84.3%

This planet

12.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 80913 b 12.00 R⊕ HIP 78530 b 12.00 R⊕ HD 221420 b 12.00 R⊕

Metric	Earth	HIP 21152 b	Jupiter
Radius (R⊕)	1.00	12.00	11.21
Mass (M⊕)	1.00	7,627.88	317.83
Density (g/cm³)	5.51	24.30	1.33
Surface Gravity (g)	1.00	52.97	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	7,627.882 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 28736

HIP

HIP 21152

TIC

TIC 452767166

Gaia DR2

Gaia DR2 3285426613077584384

Gaia DR3

Gaia DR3 3285426613077584384

System

HIP 21152

Percentile among Gas Giant cohort

Radius 12.000 R⊕ · percentile 15 / cohort 1771

Mass 7,627.882 M⊕ · percentile 98 / cohort 1747

Orbital period 22,000.00 d · percentile 98 / cohort 1533

Distance 43.41 pc · percentile 16 / cohort 1759

ESI 0.091 · percentile 23 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

22,000.000 days

Semi-major axis

17.0000 AU

Eccentricity

0.360

Inclination

95.30 °

Year Length

A year here lasts about 60.23 Earth years on a highly eccentric trajectory at a mean orbital distance of 17.0000 AU.

Eq. Temperature

1,300K

(1027 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.091

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Kuzuhara et al. 2022

Instrument

Multiple Instruments

Publication

2022-05

Observation locale

Ground

Discovery cohort

Planets confirmed in 2022 at Multiple Observatories (12 shown).

Kepler-138 e · Rocky Terrestrial HD 93351 b · Super-Earth GJ 1002 b · Rocky Terrestrial GJ 2030 b · Sub-Neptune GJ 3929 c · Sub-Neptune HD 217786 c · Sub-Neptune GJ 1002 c · Rocky Terrestrial HD 155918 b · Sub-Neptune HD 213519 b · Sub-Neptune HD 191939 g · Sub-Neptune GJ 514 b · Sub-Neptune HD 12235 b · Sub-Neptune

Host System: HIP 21152

Spectral Class

F-type yellow-white

Effective Temperature

6,655 K — hotter than the Sun (5,778 K)

Estimated Age

0.65 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.592 R☉

Stellar Mass

1.400 M☉

Metallicity [Fe/H]

0.13

Extended Stellar Properties

Surface gravity (log g)

4.300 dex

Stellar density

0.482 g/cm³

Systemic radial velocity

40.60 km/s

Rotational v·sin i

45.60 km/s

Metallicity ratio

[Fe/H]

Distance

43.41 parsec

Light-years 141.58 ly

V-band magnitude

6.37 mag

Voyager-speed travel 2,496,684 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

23.009 mas

Total Proper Motion

112.760 mas/yr

PM Right Ascension

112.51 mas/yr

PM Declination

7.58 mas/yr

Galactic Cartesian (pc)

x = 0.373 · y = 0.923 · z = 0.094

Equatorial (J2000)

RA 68.02052° · Dec 5.41007°

Galactic ℓ, b

190.146° · -27.592°

Ecliptic λ, β

67.153° · -16.303°

HTM-20 index

-1236266014