Key parameters at a glance

A radius of 0.95 Earth radii
A mass of 0.82 Earth masses
Surface gravity around 0.90 g
An orbital period of 27.810 days
Semi-major axis 0.1340 AU
Equilibrium temperature 273 K (0 °C)
Distance from Earth 101.52 light-years
Earth Similarity Index 0.945
Travel time at Voyager 1 speed 1,790,322 years
Almost certainly tidally locked to its host star given the close orbit

3 siblings around TOI-700

TOI-700 e shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
TOI-700 b	Rocky Terrestrial	0.91	0.70	9.977	417	2020
TOI-700 c	Sub-Neptune	2.60	7.27	16.051	356	2020
TOI-700 e this	Rocky Terrestrial	0.95	0.82	27.810	273	2023
TOI-700 d	Rocky Terrestrial	1.07	1.25	37.424	269	2020

TOI-700 e Planet Profile

Physical Specs

Radius

0.95 R⊕

Radius (Jupiter)

0.085 R♃

Mass

0.82 M⊕

Mass (Jupiter)

0.003 M♃

Density

5.19 g/cm³

Surface Gravity

0.90 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.945

HZ Position Habitable

Controversial No

Discovery

Year 2023

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#374of 570

top 65.4%

This planet

0.95R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-20 f 0.95 R⊕ Teegarden's Star d 0.95 R⊕ Kepler-1049 b 0.95 R⊕

Metric	Earth	TOI-700 e	Jupiter
Radius (R⊕)	1.00	0.95	11.21
Mass (M⊕)	1.00	0.82	317.83
Density (g/cm³)	5.51	5.19	1.33
Surface Gravity (g)	1.00	0.90	2.53
Insolation (S⊕)	1.00	1.27	0.037

Star Catalogue Identifiers

TIC

TIC 150428135

Gaia DR2

Gaia DR2 5284517766615492736

Gaia DR3

Gaia DR3 5284517766615850752

System

TOI-700

Percentile among Rocky Terrestrial cohort

Radius 0.953 R⊕ · percentile 34 / cohort 570

Mass 0.818 M⊕ · percentile 30 / cohort 570

Orbital period 27.81 d · percentile 96 / cohort 567

Distance 31.13 pc · percentile 14 / cohort 566

ESI 0.945 · percentile 94 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

27.810 days

Semi-major axis

0.1340 AU

Eccentricity

0.059

Inclination

89.60 °

Year Length

A year here lasts approximately 27.81 Earth days (7.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1340 AU.

Transit Fingerprint

Depth

0.041 %

Duration

2.777 h

Impact parameter b

0.470

Rp / R★

0.020800

Transit midpoint (BJD)

2,458,964.8112

Photometric dip

Transit produces a flux drop of 407 ppm lasting ≈ 2.78 h.

Extended Orbital Architecture

Planet / star radius ratio

0.020800

Impact parameter (b)

0.470

Transit mid-time (BJD)

2,458,964.8112

Long. of periastron (ω)

70.00°

Angular separation (arcsec)

4.31000

Eq. Temperature

273K

(0 °C)

Insolation (S⊕)

1.27

Earth = 1.00

Earth Similarity (ESI)

0.945

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

Gilbert et al. 2023

Instrument

TESS CCD Array

Publication

2023-01

Observation locale

Space

Discovery cohort

Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-2095 c · Super-Earth TOI-715 b · Super-Earth TOI-2095 b · Super-Earth TOI-2096 c · Super-Earth TOI-1680 b · Super-Earth TOI-2096 b · Rocky Terrestrial TOI-904 c · Sub-Neptune TOI-1470 c · Sub-Neptune TOI-198 b · Super-Earth TOI-244 b · Super-Earth TOI-4184 b · Sub-Neptune TOI-904 b · Sub-Neptune

Host System: TOI-700

Spectral Class

M-type red dwarf

Effective Temperature

3,459 K — cooler than the Sun (5,778 K)

Estimated Age

1.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.421 R☉

Stellar Mass

0.415 M☉

Metallicity [Fe/H]

-0.07

Extended Stellar Properties

Surface gravity (log g)

4.809 dex

Stellar density

7.860 g/cm³

Systemic radial velocity

-4.40 km/s

Rotation period

54.00 days

Metallicity ratio

[Fe/H]

Distance

31.13 parsec

Light-years 101.52 ly

V-band magnitude

13.15 mag

Voyager-speed travel 1,790,322 yr

Multi-band Host Photometry — 15 bands

Astrometric Data

Parallax

32.098 mas

Total Proper Motion

191.673 mas/yr

PM Right Ascension

-102.75 mas/yr

PM Declination

161.81 mas/yr

Galactic Cartesian (pc)

x = -0.051 · y = 0.410 · z = -0.911

Equatorial (J2000)

RA 97.09572° · Dec -65.57861°

Galactic ℓ, b

275.468° · -26.881°

Ecliptic λ, β

164.422° · -86.961°

HTM-20 index

-455754236

Wikipedia → Image: Wikimedia Commons · NASA/JPL-Caltech/Robert Hurt · Public domain