Key parameters at a glance

A radius of 3.54 Earth radii
A mass of 7.20 Earth masses
Surface gravity around 0.57 g
An orbital period of 21.014 days
Semi-major axis 0.1407 AU
Equilibrium temperature 581 K (308 °C)
Distance from Earth 136.69 light-years
Earth Similarity Index 0.342
Travel time at Voyager 1 speed 2,410,511 years
Almost certainly tidally locked to its host star given the close orbit

3 siblings around TOI-2076

TOI-2076 c 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-2076 e	Super-Earth	1.30	4.70	3.022	1,110	2025
TOI-2076 b	Sub-Neptune	2.59	6.70	10.355	736	2021
TOI-2076 c this	Sub-Neptune	3.54	7.20	21.014	581	2021
TOI-2076 d	Sub-Neptune	3.27	7.30	35.128	490	2021

TOI-2076 c Planet Profile

Physical Specs

Radius

3.54 R⊕

Radius (Jupiter)

0.316 R♃

Mass

7.20 M⊕

Mass (Jupiter)

0.023 M♃

Density

0.87 g/cm³

Surface Gravity

0.57 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.342

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#158of 1978

top 7.9%

This planet

3.54R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-802 b 3.54 R⊕ Kepler-1316 b 3.54 R⊕ Kepler-1524 b 3.54 R⊕

Metric	Earth	TOI-2076 c	Jupiter
Radius (R⊕)	1.00	3.54	11.21
Mass (M⊕)	1.00	7.20	317.83
Density (g/cm³)	5.51	0.87	1.33
Surface Gravity (g)	1.00	0.57	2.53
Insolation (S⊕)	1.00	32.70	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	7.200 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 27491137

Gaia DR2

Gaia DR2 1490845584382687232

Gaia DR3

Gaia DR3 1490845584382687232

System

TOI-2076

Percentile among Sub-Neptune cohort

Radius 3.540 R⊕ · percentile 92 / cohort 1978

Mass 7.200 M⊕ · percentile 43 / cohort 1978

Orbital period 21.01 d · percentile 64 / cohort 1946

Distance 41.91 pc · percentile 10 / cohort 1975

ESI 0.342 · percentile 39 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

21.014 days

Semi-major axis

0.1407 AU

Eccentricity

0.036

Inclination

89.76 °

Year Length

A year here lasts approximately 21.01 Earth days (5.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1407 AU.

Transit Fingerprint

Depth

0.207 %

Duration

4.186 h

Impact parameter b

0.070

Rp / R★

0.041640

Transit midpoint (BJD)

2,458,834.6615

Photometric dip

Transit produces a flux drop of 2,072 ppm lasting ≈ 4.19 h.

Extended Orbital Architecture

Planet / star radius ratio

0.041640

Semi-major axis / stellar radius

24.900

Impact parameter (b)

0.070

Transit mid-time (BJD)

2,458,834.6615

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

3.36000

Eq. Temperature

581K

(308 °C)

Insolation (S⊕)

32.70

Earth = 1.00

Earth Similarity (ESI)

0.342

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.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Hedges et al. 2021

Instrument

TESS CCD Array

Publication

2021-08

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-2257 b · Sub-Neptune TOI-2285 b · Super-Earth TOI-1231 b · Sub-Neptune AU Mic c · Sub-Neptune LHS 1678 c · Rocky Terrestrial LHS 1478 b · Rocky Terrestrial TOI-2406 b · Sub-Neptune HD 207897 b · Sub-Neptune TOI-269 b · Sub-Neptune TIC 172900988 b · Gas Giant TOI-178 g · Sub-Neptune TOI-2076 d · Sub-Neptune

Host System: TOI-2076

Spectral Class

K-type orange

Effective Temperature

5,187 K — cooler than the Sun (5,778 K)

Estimated Age

0.21 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.758 R☉

Stellar Mass

0.849 M☉

Metallicity [Fe/H]

-0.09

Extended Stellar Properties

Surface gravity (log g)

4.608 dex

Stellar density

2.244 g/cm³

Rotational v·sin i

5.27 km/s

Rotation period

7.21 days

Activity index (log R'HK)

-4.373

Metallicity ratio

[Fe/H]

Distance

41.91 parsec

Light-years 136.69 ly

V-band magnitude

9.14 mag

Voyager-speed travel 2,410,511 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

23.832 mas

Total Proper Motion

118.433 mas/yr

PM Right Ascension

-118.23 mas/yr

PM Declination

-6.97 mas/yr

Galactic Cartesian (pc)

x = -0.610 · y = -0.467 · z = 0.640

Equatorial (J2000)

RA 217.39202° · Dec 39.79040°

Galactic ℓ, b

71.106° · 66.056°

Ecliptic λ, β

195.865° · 50.604°

HTM-20 index

655596192

Similar Worlds

K2-285 c

Sub-Neptune · K-type orange

Radius 3.53 R⊕ · 505.4 ly

KOBE-1 c

Sub-Neptune · K-type orange

Radius 3.56 R⊕ · 78.2 ly

K2-283 b

Sub-Neptune · K-type orange

Radius 3.52 R⊕ · 1,314.1 ly

Kepler-687 b

Sub-Neptune · K-type orange

Radius 3.52 R⊕ · 2,066.7 ly

TOI-1246 e

Sub-Neptune · K-type orange

Radius 3.51 R⊕ · 552.6 ly

HIP 54373 c

Sub-Neptune · K-type orange

Radius 3.57 R⊕ · 61.0 ly

Explore Related Categories

Sub-Neptune Planets Transit Discoveries Transiting Exoplanet Survey Satellite (TESS) Mission K-type orange Hosts