Key parameters at a glance

A radius of 1.27 Earth radii
A mass of 1.91 Earth masses
Surface gravity around 1.18 g
An orbital period of 3.778 days
Semi-major axis 0.0270 AU
Equilibrium temperature 422 K (149 °C)
Distance from Earth 48.88 light-years
Earth Similarity Index 0.712
Travel time at Voyager 1 speed 861,965 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around LHS 1140

LHS 1140 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
LHS 1140 c this	Super-Earth	1.27	1.91	3.778	422	2018
LHS 1140 b	Super-Earth	1.73	5.60	24.737	226	2017

LHS 1140 c Planet Profile

Physical Specs

Radius

1.27 R⊕

Radius (Jupiter)

0.113 R♃

Mass

1.91 M⊕

Mass (Jupiter)

0.006 M♃

Density

5.10 g/cm³

Surface Gravity

1.18 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.712

HZ Position Inner

Controversial No

Discovery

Year 2018

Method Transit

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1133of 1176

top 96.3%

This planet

1.27R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

K2-233 c 1.27 R⊕ Kepler-1741 b 1.27 R⊕ K2-169 b 1.27 R⊕

Metric	Earth	LHS 1140 c	Jupiter
Radius (R⊕)	1.00	1.27	11.21
Mass (M⊕)	1.00	1.91	317.83
Density (g/cm³)	5.51	5.10	1.33
Surface Gravity (g)	1.00	1.18	2.53
Insolation (S⊕)	1.00	5.30	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1.910 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	1.710 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 92226327

Gaia DR2

Gaia DR2 2371032916186181760

Gaia DR3

Gaia DR3 2371032916186181760

System

LHS 1140

Percentile among Super-Earth cohort

Radius 1.272 R⊕ · percentile 4 / cohort 1176

Mass 1.910 M⊕ · percentile 1 / cohort 1176

Orbital period 3.78 d · percentile 29 / cohort 1164

Distance 14.99 pc · percentile 3 / cohort 1171

ESI 0.712 · percentile 86 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

3.778 days

Semi-major axis

0.0270 AU

Eccentricity

0.050

Inclination

89.80 °

Year Length

A year here lasts approximately 3.78 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0270 AU.

Transit Fingerprint

Depth

0.290 %

Duration

1.130 h

Impact parameter b

0.090

Rp / R★

0.054860

Transit midpoint (BJD)

2,458,389.2939

Photometric dip

Transit produces a flux drop of 2,900 ppm lasting ≈ 1.13 h.

Extended Orbital Architecture

Planet / star radius ratio

0.054860

Semi-major axis / stellar radius

26.570

Impact parameter (b)

0.090

RV semi-amplitude (K)

2.420 m/s

Transit mid-time (BJD)

2,458,389.2939

Angular separation (arcsec)

1.80000

Eq. Temperature

422K

(149 °C)

Insolation (S⊕)

5.30

Earth = 1.00

Earth Similarity (ESI)

0.712

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

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

Ment et al. 2019

Instrument

Multiple Instruments

Publication

2019-01

Observation locale

Multiple Locales

Discovery cohort

Planets confirmed in 2018 at Multiple Observatories (5 shown).

TCP J05074264+2447555 b · Neptune-like HD 238914 b · Gas Giant TYC 3318-01333-1 b · Gas Giant BD+48 740 b · Gas Giant CoRoT-20 c · Gas Giant

Host System: LHS 1140

Spectral Class

M-type red dwarf

Effective Temperature

3,096 K — cooler than the Sun (5,778 K)

Estimated Age

5.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.216 R☉

Stellar Mass

0.184 M☉

Metallicity [Fe/H]

-0.15

Extended Stellar Properties

Surface gravity (log g)

5.041 dex

Stellar density

25.800 g/cm³

Systemic radial velocity

-13.23 km/s

Rotation period

131.00 days

Metallicity ratio

[Fe/H]

Distance

14.99 parsec

Light-years 48.88 ly

V-band magnitude

14.15 mag

Voyager-speed travel 861,965 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

66.700 mas

Total Proper Motion

675.879 mas/yr

PM Right Ascension

317.59 mas/yr

PM Declination

-596.62 mas/yr

Galactic Cartesian (pc)

x = 0.946 · y = 0.188 · z = -0.263

Equatorial (J2000)

RA 11.24863° · Dec -15.27411°

Galactic ℓ, b

115.405° · -78.052°

Ecliptic λ, β

4.098° · -18.454°

HTM-20 index

-652728547

Observation Record

Transmission spectra

Emission spectra

Archive notes