Key parameters at a glance

A radius of 4.55 Earth radii
A mass of 18.80 Earth masses
Surface gravity around 0.91 g
An orbital period of 87.190 days
Semi-major axis 0.3350 AU
Distance from Earth 105.45 light-years
Earth Similarity Index 0.505
Travel time at Voyager 1 speed 1,859,608 years

HIP 71135 b Planet Profile

Physical Specs

Radius

4.55 R⊕

Radius (Jupiter)

0.406 R♃

Mass

18.80 M⊕

Mass (Jupiter)

0.059 M♃

Density

1.10 g/cm³

Surface Gravity

0.91 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.505

HZ Position Unknown

Controversial No

Discovery

Year 2019

Method Radial Velocity

Facility Las Campanas Observatory

Telescope 6.5 m Magellan II Clay Telescope

Size rank in cohort

Rank by radius

#457of 574

top 79.4%

This planet

4.55R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-6041 b 4.55 R⊕ Kepler-1764 b 4.56 R⊕ Kepler-1752 b 4.54 R⊕

Metric	Earth	HIP 71135 b	Jupiter
Radius (R⊕)	1.00	4.55	11.21
Mass (M⊕)	1.00	18.80	317.83
Density (g/cm³)	5.51	1.10	1.33
Surface Gravity (g)	1.00	0.91	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	18.800 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 71135

TIC

TIC 457695809

Gaia DR2

Gaia DR2 5897706154359881088

Gaia DR3

Gaia DR3 5897706154359881088

System

HIP 71135

Percentile among Neptune-like cohort

Radius 4.550 R⊕ · percentile 20 / cohort 574

Mass 18.800 M⊕ · percentile 24 / cohort 574

Orbital period 87.19 d · percentile 79 / cohort 524

Distance 32.33 pc · percentile 10 / cohort 572

ESI 0.505 · percentile 91 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

87.190 days

Semi-major axis

0.3350 AU

Eccentricity

0.210

Inclination

— °

Year Length

A year here lasts approximately 87.19 Earth days (23.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.3350 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.505

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Feng et al. 2019

Instrument

Carnegie Planet Finder Spectrograph

Publication

2019-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2019 at Las Campanas Observatory (12 shown).

HD 39855 b · Sub-Neptune HIP 54373 b · Sub-Neptune HD 103949 b · Sub-Neptune HD 24085 b · Sub-Neptune HIP 54373 c · Sub-Neptune HIP 35173 b · Sub-Neptune HD 211970 b · Sub-Neptune HD 64114 b · Neptune-like HD 206255 b · Neptune-like HD 21411 b · Neptune-like HD 8326 b · Neptune-like HD 102843 b · Gas Giant

Host System: HIP 71135

Spectral Class

M-type red dwarf

Effective Temperature

4,146 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.681 R☉

Stellar Mass

0.660 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.542 dex

Stellar density

2.523 g/cm³

Systemic radial velocity

71.08 km/s

Distance

32.33 parsec

Light-years 105.45 ly

V-band magnitude

10.53 mag

Voyager-speed travel 1,859,608 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

30.901 mas

Total Proper Motion

255.044 mas/yr

PM Right Ascension

-250.34 mas/yr

PM Declination

-48.76 mas/yr

Galactic Cartesian (pc)

x = -0.477 · y = -0.375 · z = -0.795

Equatorial (J2000)

RA 218.21581° · Dec -52.64648°

Galactic ℓ, b

318.115° · 7.210°

Ecliptic λ, β

234.180° · -35.451°

HTM-20 index

-103481914