Key parameters at a glance

A radius of 1.44 Earth radii
A mass of 2.67 Earth masses
Surface gravity around 1.29 g
An orbital period of 5.436 days
Semi-major axis 0.0341 AU
Equilibrium temperature 388 K (115 °C)
Distance from Earth 124.18 light-years
Earth Similarity Index 0.743
Travel time at Voyager 1 speed 2,189,977 years
Almost certainly tidally locked to its host star given the close orbit

TOI-237 b Planet Profile

Physical Specs

Radius

1.44 R⊕

Radius (Jupiter)

0.128 R♃

Mass

2.67 M⊕

Mass (Jupiter)

0.008 M♃

Density

4.91 g/cm³

Surface Gravity

1.29 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.743

HZ Position Inner

Controversial No

Discovery

Year 2020

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#850of 1176

top 72.2%

This planet

1.44R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-1245 b 1.44 R⊕ Kepler-1149 b 1.44 R⊕ Kepler-1007 b 1.44 R⊕

Metric	Earth	TOI-237 b	Jupiter
Radius (R⊕)	1.00	1.44	11.21
Mass (M⊕)	1.00	2.67	317.83
Density (g/cm³)	5.51	4.91	1.33
Surface Gravity (g)	1.00	1.29	2.53
Insolation (S⊕)	1.00	3.70	0.037

Star Catalogue Identifiers

TIC

TIC 305048087

Gaia DR2

Gaia DR2 2329387852426700800

Gaia DR3

Gaia DR3 2329387852426700800

System

TOI-237

Percentile among Super-Earth cohort

Radius 1.440 R⊕ · percentile 27 / cohort 1176

Mass 2.670 M⊕ · percentile 25 / cohort 1176

Orbital period 5.44 d · percentile 43 / cohort 1164

Distance 38.07 pc · percentile 8 / cohort 1171

ESI 0.743 · percentile 87 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

5.436 days

Semi-major axis

0.0341 AU

Eccentricity

0.000

Inclination

89.50 °

Year Length

A year here lasts approximately 5.44 Earth days (1.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0341 AU.

Transit Fingerprint

Depth

0.380 %

Duration

1.542 h

Impact parameter b

0.300

Rp / R★

0.062000

Transit midpoint (BJD)

2,458,697.7198

Photometric dip

Transit produces a flux drop of 3,800 ppm lasting ≈ 1.54 h.

Extended Orbital Architecture

Planet / star radius ratio

0.062000

Semi-major axis / stellar radius

34.700

Impact parameter (b)

0.300

Transit mid-time (BJD)

2,458,697.7198

Angular separation (arcsec)

0.89600

Eq. Temperature

388K

(115 °C)

Insolation (S⊕)

3.70

Earth = 1.00

Earth Similarity (ESI)

0.743

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.

Discovery Paper

Primary reference

Waalkes et al. 2021

Instrument

TESS CCD Array

Publication

2021-01

Observation locale

Space

Discovery cohort

Planets confirmed in 2020 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-700 d · Rocky Terrestrial TOI-700 b · Rocky Terrestrial TOI-1266 c · Super-Earth LTT 3780 c · Sub-Neptune TOI-700 c · Sub-Neptune TOI-776 c · Sub-Neptune TOI-942 c · Neptune-like TOI-776 b · Super-Earth TOI-1266 b · Sub-Neptune TOI-540 b · Rocky Terrestrial LHS 1815 b · Rocky Terrestrial TOI-122 b · Sub-Neptune

Host System: TOI-237

Spectral Class

M-type red dwarf

Effective Temperature

3,212 K — cooler than the Sun (5,778 K)

Estimated Age

4.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.211 R☉

Stellar Mass

0.179 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

5.040 dex

Stellar density

25.600 g/cm³

Systemic radial velocity

7.80 km/s

Rotational v·sin i

6.40 km/s

Rotation period

102.00 days

Distance

38.07 parsec

Light-years 124.18 ly

V-band magnitude

16.37 mag

Voyager-speed travel 2,189,977 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

26.237 mas

Total Proper Motion

365.833 mas/yr

PM Right Ascension

151.05 mas/yr

PM Declination

-333.19 mas/yr

Galactic Cartesian (pc)

x = 0.865 · y = -0.102 · z = -0.491

Equatorial (J2000)

RA 353.24354° · Dec -29.41649°

Galactic ℓ, b

20.778° · -72.594°

Ecliptic λ, β

341.498° · -24.196°

HTM-20 index

1133985191