Key parameters at a glance

A radius of 2.47 Earth radii
A mass of 6.66 Earth masses
Surface gravity around 1.09 g
An orbital period of 6.078 days
Semi-major axis 0.0501 AU
Equilibrium temperature 527 K (254 °C)
Distance from Earth 373.61 light-years
Earth Similarity Index 0.476
Travel time at Voyager 1 speed 6,588,584 years
Almost certainly tidally locked to its host star given the close orbit

TOI-2084 b Planet Profile

Physical Specs

Radius

2.47 R⊕

Radius (Jupiter)

0.220 R♃

Mass

6.66 M⊕

Mass (Jupiter)

0.021 M♃

Density

2.43 g/cm³

Surface Gravity

1.09 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.476

HZ Position Inner

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

#1226of 1978

top 61.9%

This planet

2.47R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-263 c 2.47 R⊕ Kepler-1101 b 2.47 R⊕ Kepler-269 b 2.47 R⊕

Metric	Earth	TOI-2084 b	Jupiter
Radius (R⊕)	1.00	2.47	11.21
Mass (M⊕)	1.00	6.66	317.83
Density (g/cm³)	5.51	2.43	1.33
Surface Gravity (g)	1.00	1.09	2.53
Insolation (S⊕)	1.00	12.80	0.037

Star Catalogue Identifiers

TIC

TIC 441738827

Gaia DR2

Gaia DR2 1652137995942479744

Gaia DR3

Gaia DR3 1652137995942479744

System

TOI-2084

Percentile among Sub-Neptune cohort

Radius 2.470 R⊕ · percentile 37 / cohort 1978

Mass 6.660 M⊕ · percentile 35 / cohort 1978

Orbital period 6.08 d · percentile 18 / cohort 1946

Distance 114.55 pc · percentile 23 / cohort 1975

ESI 0.476 · percentile 67 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

6.078 days

Semi-major axis

0.0501 AU

Eccentricity

—

Inclination

89.15 °

Year Length

A year here lasts approximately 6.08 Earth days (1.7% of a terrestrial year) at a mean orbital distance of 0.0501 AU.

Transit Fingerprint

Depth

0.195 %

Duration

2.030 h

Impact parameter b

0.336

Transit midpoint (BJD)

2,458,741.0732

Photometric dip

Transit produces a flux drop of 1,950 ppm lasting ≈ 2.03 h.

Extended Orbital Architecture

Semi-major axis / stellar radius

22.660

Impact parameter (b)

0.336

Transit mid-time (BJD)

2,458,741.0732

Angular separation (arcsec)

0.43700

Eq. Temperature

527K

(254 °C)

Insolation (S⊕)

12.80

Earth = 1.00

Earth Similarity (ESI)

0.476

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

Barkaoui et al. 2023

Instrument

TESS CCD Array

Publication

2023-06

Observation locale

Space

Discovery cohort

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

TOI-700 e · Rocky Terrestrial 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

Host System: TOI-2084

Spectral Class

M-type red dwarf

Effective Temperature

3,551 K — cooler than the Sun (5,778 K)

Estimated Age

7.50 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.475 R☉

Stellar Mass

0.453 M☉

Metallicity [Fe/H]

-0.13

Extended Stellar Properties

Surface gravity (log g)

4.750 dex

Stellar density

5.964 g/cm³

Metallicity ratio

[Fe/H]

Distance

114.55 parsec

Light-years 373.61 ly

V-band magnitude

15.12 mag

Voyager-speed travel 6,588,584 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

8.701 mas

Total Proper Motion

60.244 mas/yr

PM Right Ascension

47.72 mas/yr

PM Declination

36.77 mas/yr

Galactic Cartesian (pc)

x = -0.055 · y = -0.291 · z = 0.955

Equatorial (J2000)

RA 259.25454° · Dec 72.74702°

Galactic ℓ, b

104.076° · 32.763°

Ecliptic λ, β

116.165° · 82.797°

HTM-20 index

1354594436