Key parameters at a glance

A radius of 1.02 Earth radii
A mass of 1.05 Earth masses
Surface gravity around 1.01 g
An orbital period of 11.416 days
Semi-major axis 0.0455 AU
Equilibrium temperature 209 K (-64 °C)
Distance from Earth 12.49 light-years
Earth Similarity Index 0.782
Travel time at Voyager 1 speed 220,337 years
Almost certainly tidally locked to its host star given the close orbit

Context from the literature

Teegarden's Star c is an exoplanet found orbiting in the habitable zone of Teegarden's Star, an M-type red dwarf star 12.5 light-years away from the Solar System. It orbits in the conservative habitable zone around its star. Along with Teegarden's Star b, it is among the closest-known potentially habitable exoplanets. It was discovered in June 2019.

Excerpted from Wikipedia · full article

2 siblings around Teegarden's Star

Teegarden's Star c shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Teegarden's Star b	Rocky Terrestrial	1.05	1.16	4.906	277	2019
Teegarden's Star c this	Rocky Terrestrial	1.02	1.05	11.416	209	2019
Teegarden's Star d	Rocky Terrestrial	0.95	0.82	26.130	159	2024

Teegarden's Star c Planet Profile

Physical Specs

Radius

1.02 R⊕

Radius (Jupiter)

0.091 R♃

Mass

1.05 M⊕

Mass (Jupiter)

0.003 M♃

Density

5.44 g/cm³

Surface Gravity

1.01 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.782

HZ Position Habitable

Controversial No

Discovery

Year 2019

Method Radial Velocity

Facility Calar Alto Observatory

Telescope 3.5 m telescope

Size rank in cohort

Rank by radius

#311of 570

top 54.4%

This planet

1.02R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-336 b 1.02 R⊕ Kepler-130 b 1.02 R⊕ Proxima Cen b 1.02 R⊕

Metric	Earth	Teegarden's Star c	Jupiter
Radius (R⊕)	1.00	1.02	11.21
Mass (M⊕)	1.00	1.05	317.83
Density (g/cm³)	5.51	5.44	1.33
Surface Gravity (g)	1.00	1.01	2.53
Insolation (S⊕)	1.00	0.35	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	1.050 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 257870150

Gaia DR2

Gaia DR2 35227046884571776

Gaia DR3

Gaia DR3 35227046884571776

System

Teegarden's Star

Percentile among Rocky Terrestrial cohort

Radius 1.020 R⊕ · percentile 44 / cohort 570

Mass 1.050 M⊕ · percentile 40 / cohort 570

Orbital period 11.42 d · percentile 81 / cohort 567

Distance 3.83 pc · percentile 2 / cohort 566

ESI 0.782 · percentile 86 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

11.416 days

Semi-major axis

0.0455 AU

Eccentricity

0.040

Inclination

— °

Year Length

A year here lasts approximately 11.42 Earth days (3.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0455 AU.

Eq. Temperature

209K

(-64 °C)

Insolation (S⊕)

0.35

Earth = 1.00

Earth Similarity (ESI)

0.782

0 = alien, 1 = Earth-identical

Within the conservative habitable zone — surface water would be frozen. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Zechmeister et al. 2019

Instrument

CARMENES

Publication

2019-07

Observation locale

Ground

Discovery cohort

Planets confirmed in 2019 at Calar Alto Observatory (4 shown).

Teegarden's Star b · Rocky Terrestrial LSPM J2116+0234 b · Sub-Neptune GJ 4276 b · Neptune-like GJ 3512 b · Gas Giant

Host System: Teegarden's Star

Spectral Class

M-type red dwarf

Effective Temperature

3,034 K — cooler than the Sun (5,778 K)

Estimated Age

8.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.120 R☉

Stellar Mass

0.097 M☉

Metallicity [Fe/H]

-0.11

Extended Stellar Properties

Surface gravity (log g)

5.190 dex

Stellar density

79.807 g/cm³

Rotational v·sin i

2.00 km/s

Rotation period

96.20 days

Metallicity ratio

[Fe/H]

Distance

3.83 parsec

Light-years 12.49 ly

V-band magnitude

15.13 mag

Voyager-speed travel 220,337 yr

Multi-band Host Photometry — 6 bands

Astrometric Data

Parallax

261.015 mas

Total Proper Motion

5,123.332 mas/yr

PM Right Ascension

3,429.53 mas/yr

PM Declination

-3,806.16 mas/yr

Galactic Cartesian (pc)

x = 0.697 · y = 0.656 · z = 0.290

Equatorial (J2000)

RA 43.26914° · Dec 16.86490°

Galactic ℓ, b

160.290° · -37.031°

Ecliptic λ, β

45.822° · 0.301°

HTM-20 index

-1746316371

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