Key parameters at a glance

A radius of 9.40 Earth radii
A mass of 64.40 Earth masses
Surface gravity around 0.73 g
An orbital period of 2,205.000 days
Semi-major axis 3.3810 AU
Distance from Earth 127.07 light-years
Earth Similarity Index 0.319
Travel time at Voyager 1 speed 2,240,926 years

5 siblings around HD 10180

HD 10180 h shares its host star with 5 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 10180 c	Unclassified	—	2,741.59	5.760	—	2010
HD 10180 d	Unclassified	—	3,295.88	16.357	—	2010
HD 10180 e	Neptune-like	5.39	25.10	49.748	—	2010
HD 10180 f	Neptune-like	5.24	23.90	122.744	—	2010
HD 10180 g	Unclassified	—	3,375.34	604.670	—	2010
HD 10180 h this	Neptune-like	9.40	64.40	2,205.000	—	2010

HD 10180 h Planet Profile

Physical Specs

Radius

9.40 R⊕

Radius (Jupiter)

0.838 R♃

Mass

64.40 M⊕

Mass (Jupiter)

0.203 M♃

Density

0.43 g/cm³

Surface Gravity

0.73 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.319

HZ Position Unknown

Controversial No

Discovery

Year 2010

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#50of 574

top 8.5%

This planet

9.40R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-1898 b 9.40 R⊕ V1298 Tau b 9.41 R⊕ CoRoT-20 b 9.42 R⊕

Metric	Earth	HD 10180 h	Jupiter
Radius (R⊕)	1.00	9.40	11.21
Mass (M⊕)	1.00	64.40	317.83
Density (g/cm³)	5.51	0.43	1.33
Surface Gravity (g)	1.00	0.73	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	65.664 M⊕	Lower bound from radial-velocity fitting.
Computed mass	64.400 M⊕	Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

HD 10180

HIP

HIP 7599

TIC

TIC 231836962

Gaia DR2

Gaia DR2 4716158250340258944

Gaia DR3

Gaia DR3 4716158250340258944

System

HD 10180

Percentile among Neptune-like cohort

Radius 9.400 R⊕ · percentile 91 / cohort 574

Mass 64.400 M⊕ · percentile 82 / cohort 574

Orbital period 2,205.00 d · percentile 99 / cohort 524

Distance 38.96 pc · percentile 12 / cohort 572

ESI 0.319 · percentile 55 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

2,205.000 days

Semi-major axis

3.3810 AU

Eccentricity

0.095

Inclination

90.00 °

Year Length

A year here lasts about 6.04 Earth years on a nearly circular orbit at a mean orbital distance of 3.3810 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.319

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Lovis et al. 2011

Instrument

HARPS Spectrograph

Publication

2011-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2010 at La Silla Observatory (12 shown).

GJ 3634 b · Sub-Neptune HD 10180 f · Neptune-like HD 10180 e · Neptune-like GJ 676 A b · Gas Giant HD 204313 b · Gas Giant HD 28254 b · Gas Giant HD 1690 b · Gas Giant HD 113538 c · Gas Giant HD 25171 b · Gas Giant HD 8535 b · Gas Giant HD 44219 b · Gas Giant HD 43197 b · Gas Giant

Host System: HD 10180

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,911 K — hotter than the Sun (5,778 K)

Estimated Age

4.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.109 R☉

Stellar Mass

1.060 M☉

Metallicity [Fe/H]

0.08

Extended Stellar Properties

Surface gravity (log g)

4.390 dex

Stellar density

0.922 g/cm³

Systemic radial velocity

35.53 km/s

Rotational v·sin i

3.00 km/s

Activity index (log R'HK)

-5.040

Metallicity ratio

[Fe/H]

Distance

38.96 parsec

Light-years 127.07 ly

V-band magnitude

7.33 mag

Voyager-speed travel 2,240,926 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

25.638 mas

Total Proper Motion

16.588 mas/yr

PM Right Ascension

-14.38 mas/yr

PM Declination

8.27 mas/yr

Galactic Cartesian (pc)

x = 0.448 · y = 0.204 · z = -0.870

Equatorial (J2000)

RA 24.47311° · Dec -60.51149°

Galactic ℓ, b

292.805° · -55.694°

Ecliptic λ, β

340.440° · -61.611°

HTM-20 index

327679115