Key parameters at a glance

A radius of 2.52 Earth radii
A mass of 10.70 Earth masses
Surface gravity around 1.68 g
An orbital period of 19.606 days
Semi-major axis 0.1390 AU
Equilibrium temperature 651 K (378 °C)
Distance from Earth 331.68 light-years
Earth Similarity Index 0.407
Travel time at Voyager 1 speed 5,849,196 years

1 sibling around HIP 8152

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

HIP 8152 c Planet Profile

Physical Specs

Radius

2.52 R⊕

Radius (Jupiter)

0.225 R♃

Mass

10.70 M⊕

Mass (Jupiter)

0.034 M♃

Density

3.63 g/cm³

Surface Gravity

1.68 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.407

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

#1146of 1978

top 57.9%

This planet

2.52R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 15337 c 2.53 R⊕ Kepler-748 b 2.52 R⊕ Kepler-129 c 2.52 R⊕

Metric	Earth	HIP 8152 c	Jupiter
Radius (R⊕)	1.00	2.52	11.21
Mass (M⊕)	1.00	10.70	317.83
Density (g/cm³)	5.51	3.63	1.33
Surface Gravity (g)	1.00	1.68	2.53
Insolation (S⊕)	1.00	39.90	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	10.700 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 2.524 R⊕ · percentile 42 / cohort 1978

Mass 10.700 M⊕ · percentile 78 / cohort 1978

Orbital period 19.61 d · percentile 61 / cohort 1946

Distance 101.69 pc · percentile 20 / cohort 1975

ESI 0.407 · percentile 54 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

19.606 days

Semi-major axis

0.1390 AU

Eccentricity

0.200

Inclination

— °

Year Length

A year here lasts approximately 19.61 Earth days (5.4% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1390 AU.

Transit Fingerprint

Depth

0.059 %

Duration

4.383 h

Impact parameter b

0.397

Rp / R★

0.024100

Transit midpoint (BJD)

2,458,398.2869

Photometric dip

Transit produces a flux drop of 591 ppm lasting ≈ 4.38 h.

Extended Orbital Architecture

Planet / star radius ratio

0.024100

Semi-major axis / stellar radius

31.200

Impact parameter (b)

0.397

RV semi-amplitude (K)

2.760 m/s

Transit mid-time (BJD)

2,458,398.2869

Long. of periastron (ω)

110.00°

Angular separation (arcsec)

1.37000

Eq. Temperature

651K

(378 °C)

Insolation (S⊕)

39.90

Earth = 1.00

Earth Similarity (ESI)

0.407

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