Key parameters at a glance

A radius of 2.04 Earth radii
A mass of 4.82 Earth masses
Surface gravity around 1.16 g
An orbital period of 10.505 days
Semi-major axis 0.0752 AU
Equilibrium temperature 488 K (215 °C)
Distance from Earth 203.34 light-years
Earth Similarity Index 0.547
Travel time at Voyager 1 speed 3,585,912 years
Almost certainly tidally locked to its host star given the close orbit

TOI-2081 b Planet Profile

Physical Specs

Radius

2.04 R⊕

Radius (Jupiter)

0.182 R♃

Mass

4.82 M⊕

Mass (Jupiter)

0.015 M♃

Density

3.12 g/cm³

Surface Gravity

1.16 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.547

HZ Position Inner

Controversial No

Discovery

Year 2022

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#1904of 1978

top 96.2%

This planet

2.04R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 20794 d 2.04 R⊕ Kepler-230 c 2.04 R⊕ Kepler-48 d 2.04 R⊕

Metric	Earth	TOI-2081 b	Jupiter
Radius (R⊕)	1.00	2.04	11.21
Mass (M⊕)	1.00	4.82	317.83
Density (g/cm³)	5.51	3.12	1.33
Surface Gravity (g)	1.00	1.16	2.53
Insolation (S⊕)	1.00	8.10	0.037

Star Catalogue Identifiers

TIC

TIC 321669174

Gaia DR2

Gaia DR2 1416730563570869376

Gaia DR3

Gaia DR3 1416730563570869376

System

TOI-2081

Percentile among Sub-Neptune cohort

Radius 2.040 R⊕ · percentile 3 / cohort 1978

Mass 4.820 M⊕ · percentile 5 / cohort 1978

Orbital period 10.51 d · percentile 36 / cohort 1946

Distance 62.34 pc · percentile 14 / cohort 1975

ESI 0.547 · percentile 76 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

10.505 days

Semi-major axis

0.0752 AU

Eccentricity

—

Inclination

89.34 °

Year Length

A year here lasts approximately 10.51 Earth days (2.9% of a terrestrial year) at a mean orbital distance of 0.0752 AU.

Transit Fingerprint

Depth

0.132 %

Duration

2.485 h

Impact parameter b

0.350

Rp / R★

0.039600

Transit midpoint (BJD)

2,458,685.8996

Photometric dip

Transit produces a flux drop of 1,321 ppm lasting ≈ 2.49 h.

Extended Orbital Architecture

Planet / star radius ratio

0.039600

Semi-major axis / stellar radius

30.300

Impact parameter (b)

0.350

Transit mid-time (BJD)

2,458,685.8996

Angular separation (arcsec)

1.21000

Eq. Temperature

488K

(215 °C)

Insolation (S⊕)

8.10

Earth = 1.00

Earth Similarity (ESI)

0.547

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

Esparza Borges et al. 2022

Instrument

TESS CCD Array

Publication

2022-06

Observation locale

Space

Discovery cohort

Planets confirmed in 2022 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-1452 b · Super-Earth TOI-712 d · Sub-Neptune TOI-1468 c · Sub-Neptune TOI-2136 b · Sub-Neptune LTT 1445 A c · Rocky Terrestrial TOI-712 c · Sub-Neptune LP 890-9 b · Super-Earth GJ 3929 b · Rocky Terrestrial HD 260655 c · Super-Earth HD 73583 c · Sub-Neptune TOI-1759 b · Sub-Neptune TOI-1246 e · Sub-Neptune

Host System: TOI-2081

Spectral Class

M-type red dwarf

Effective Temperature

3,800 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.534 R☉

Stellar Mass

0.540 M☉

Metallicity [Fe/H]

-0.50

Extended Stellar Properties

Surface gravity (log g)

4.500 dex

Stellar density

5.280 g/cm³

Metallicity ratio

[Fe/H]

Distance

62.34 parsec

Light-years 203.34 ly

V-band magnitude

13.37 mag

Voyager-speed travel 3,585,912 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

16.011 mas

Total Proper Motion

116.410 mas/yr

PM Right Ascension

-111.99 mas/yr

PM Declination

-31.78 mas/yr

Galactic Cartesian (pc)

x = -0.060 · y = -0.598 · z = 0.799

Equatorial (J2000)

RA 264.30226° · Dec 53.02557°

Galactic ℓ, b

80.500° · 32.320°

Ecliptic λ, β

255.522° · 76.178°

HTM-20 index

1397462991