Key parameters at a glance

A radius of 2.54 Earth radii
A mass of 8.90 Earth masses
Surface gravity around 1.38 g
An orbital period of 10.751 days
Semi-major axis 0.0930 AU
Equilibrium temperature 795 K (522 °C)
Distance from Earth 331.68 light-years
Earth Similarity Index 0.326
Travel time at Voyager 1 speed 5,849,196 years

1 sibling around HIP 8152

HIP 8152 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
HIP 8152 b this	Sub-Neptune	2.54	8.90	10.751	795	2023
HIP 8152 c	Sub-Neptune	2.52	10.70	19.606	651	2023

HIP 8152 b Planet Profile

Physical Specs

Radius

2.54 R⊕

Radius (Jupiter)

0.226 R♃

Mass

8.90 M⊕

Mass (Jupiter)

0.028 M♃

Density

2.97 g/cm³

Surface Gravity

1.38 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.326

HZ Position Inner

Controversial No

Discovery

Year 2023

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#1132of 1978

top 57.2%

This planet

2.54R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-1233.01 2.54 R⊕ Kepler-325 c 2.54 R⊕ Kepler-1116 b 2.54 R⊕

Metric	Earth	HIP 8152 b	Jupiter
Radius (R⊕)	1.00	2.54	11.21
Mass (M⊕)	1.00	8.90	317.83
Density (g/cm³)	5.51	2.97	1.33
Surface Gravity (g)	1.00	1.38	2.53
Insolation (S⊕)	1.00	88.90	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	8.900 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HIP

HIP 8152

TIC

TIC 164767175

Gaia DR2

Gaia DR2 5140454049422547200

Gaia DR3

Gaia DR3 5140454049422547200

System

HIP 8152

Percentile among Sub-Neptune cohort

Radius 2.536 R⊕ · percentile 43 / cohort 1978

Mass 8.900 M⊕ · percentile 64 / cohort 1978

Orbital period 10.75 d · percentile 37 / cohort 1946

Distance 101.69 pc · percentile 20 / cohort 1975

ESI 0.326 · percentile 34 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

10.751 days

Semi-major axis

0.0930 AU

Eccentricity

0.000

Inclination

— °

Year Length

A year here lasts approximately 10.75 Earth days (2.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0930 AU.

Transit Fingerprint

Depth

0.059 %

Duration

2.995 h

Impact parameter b

0.519

Rp / R★

0.024213

Transit midpoint (BJD)

2,458,393.0855

Photometric dip

Transit produces a flux drop of 586 ppm lasting ≈ 3.00 h.

Extended Orbital Architecture

Planet / star radius ratio

0.024213

Semi-major axis / stellar radius

20.900

Impact parameter (b)

0.519

RV semi-amplitude (K)

2.710 m/s

Transit mid-time (BJD)

2,458,393.0855

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

0.91500

Eq. Temperature

795K

(522 °C)

Insolation (S⊕)

88.90

Earth = 1.00

Earth Similarity (ESI)

0.326

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Akana Murphy et al. 2023

Instrument

TESS CCD Array

Publication

2023-10

Observation locale

Space

Discovery cohort

Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-700 e · Rocky Terrestrial TOI-2095 c · Super-Earth TOI-715 b · Super-Earth TOI-2095 b · Super-Earth TOI-2096 c · Super-Earth TOI-1680 b · Super-Earth TOI-2096 b · Rocky Terrestrial TOI-904 c · Sub-Neptune TOI-1470 c · Sub-Neptune TOI-198 b · Super-Earth TOI-244 b · Super-Earth TOI-4184 b · Sub-Neptune

Host System: HIP 8152

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,618 K — cooler than the Sun (5,778 K)

Estimated Age

6.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.960 R☉

Stellar Mass

0.937 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.443 dex

Stellar density

1.478 g/cm³

Activity index (log R'HK)

-5.020

Metallicity ratio

[Fe/H]

Distance

101.69 parsec

Light-years 331.68 ly

V-band magnitude

10.07 mag

Voyager-speed travel 5,849,196 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

9.805 mas

Total Proper Motion

140.844 mas/yr

PM Right Ascension

-87.07 mas/yr

PM Declination

-110.71 mas/yr

Galactic Cartesian (pc)

x = 0.851 · y = 0.419 · z = -0.316

Equatorial (J2000)

RA 26.20925° · Dec -18.40138°

Galactic ℓ, b

180.347° · -74.929°

Ecliptic λ, β

16.913° · -27.150°

HTM-20 index

-1917668304