Key parameters at a glance

A radius of 1.29 Earth radii
A mass of 2.37 Earth masses
Surface gravity around 1.43 g
An orbital period of 0.463 days
Semi-major axis 0.0062 AU
Equilibrium temperature 816 K (543 °C)
Distance from Earth 48.55 light-years
Earth Similarity Index 0.379
Travel time at Voyager 1 speed 856,127 years
Almost certainly tidally locked to its host star given the close orbit

LHS 3844 b Planet Profile

Physical Specs

Radius

1.29 R⊕

Radius (Jupiter)

0.115 R♃

Mass

2.37 M⊕

Mass (Jupiter)

0.007 M♃

Density

6.15 g/cm³

Surface Gravity

1.43 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.379

HZ Position Inner

Controversial No

Discovery

Year 2019

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#1113of 1176

top 94.6%

This planet

1.29R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-1953 b 1.29 R⊕ K2-407 b 1.28 R⊕ GJ 486 b 1.29 R⊕

Metric	Earth	LHS 3844 b	Jupiter
Radius (R⊕)	1.00	1.29	11.21
Mass (M⊕)	1.00	2.37	317.83
Density (g/cm³)	5.51	6.15	1.33
Surface Gravity (g)	1.00	1.43	2.53
Insolation (S⊕)	1.00	73.67	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	2.370 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 410153553

Gaia DR2

Gaia DR2 6385548541499112448

Gaia DR3

Gaia DR3 6385548541499112448

System

LHS 3844

Percentile among Super-Earth cohort

Radius 1.286 R⊕ · percentile 5 / cohort 1176

Mass 2.370 M⊕ · percentile 14 / cohort 1176

Orbital period 0.46 d · percentile 1 / cohort 1164

Distance 14.88 pc · percentile 3 / cohort 1171

ESI 0.379 · percentile 57 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

0.463 days

Semi-major axis

0.0062 AU

Eccentricity

0.000

Inclination

88.90 °

Year Length

A year here lasts roughly 11.1 hours long on a nearly circular orbit at a mean orbital distance of 0.0062 AU.

Transit Fingerprint

Depth

0.451 %

Duration

0.524 h

Impact parameter b

0.137

Rp / R★

0.062620

Transit midpoint (BJD)

2,460,178.8331

Photometric dip

Transit produces a flux drop of 4,507 ppm lasting ≈ 0.52 h.

Extended Orbital Architecture

Planet / star radius ratio

0.062620

Semi-major axis / stellar radius

7.122

Impact parameter (b)

0.137

RV semi-amplitude (K)

6.950 m/s

Transit mid-time (BJD)

2,460,178.8331

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

0.41900

Eq. Temperature

816K

(543 °C)

Insolation (S⊕)

73.67

Earth = 1.00

Earth Similarity (ESI)

0.379

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

Vanderspek et al. 2019

Instrument

TESS CCD Array

Publication

2019-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2019 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

LP 791-18 c · Sub-Neptune LTT 1445 A b · Super-Earth TOI-270 d · Sub-Neptune L 98-59 d · Super-Earth GJ 357 b · Rocky Terrestrial GJ 143 b · Sub-Neptune HD 23472 c · Super-Earth L 98-59 c · Super-Earth LP 791-18 b · Rocky Terrestrial TOI-270 c · Sub-Neptune HD 23472 b · Sub-Neptune TOI-270 b · Super-Earth

Host System: LHS 3844

Spectral Class

M-type red dwarf

Effective Temperature

3,080 K — cooler than the Sun (5,778 K)

Estimated Age

7.80 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.189 R☉

Stellar Mass

0.151 M☉

Metallicity [Fe/H]

0.22

Extended Stellar Properties

Surface gravity (log g)

5.070 dex

Stellar density

31.888 g/cm³

Rotation period

130.00 days

Metallicity ratio

[Fe/H]

Distance

14.88 parsec

Light-years 48.55 ly

V-band magnitude

15.24 mag

Voyager-speed travel 856,127 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

67.155 mas

Total Proper Motion

800.179 mas/yr

PM Right Ascension

334.36 mas/yr

PM Declination

-726.97 mas/yr

Galactic Cartesian (pc)

x = 0.335 · y = -0.119 · z = -0.935

Equatorial (J2000)

RA 340.49620° · Dec -69.17211°

Galactic ℓ, b

318.249° · -43.906°

Ecliptic λ, β

304.882° · -54.126°

HTM-20 index

-841378927