Key parameters at a glance

A radius of 2.69 Earth radii
A mass of 9.13 Earth masses
Surface gravity around 1.26 g
An orbital period of 9.229 days
Semi-major axis 0.0780 AU
Equilibrium temperature 666 K (393 °C)
Distance from Earth 73.78 light-years
Earth Similarity Index 0.379
Travel time at Voyager 1 speed 1,301,060 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around TOI-2134

TOI-2134 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
TOI-2134 b this	Sub-Neptune	2.69	9.13	9.229	666	2023
TOI-2134 c	Neptune-like	7.27	41.89	95.500	306	2023

TOI-2134 b Planet Profile

Physical Specs

Radius

2.69 R⊕

Radius (Jupiter)

0.240 R♃

Mass

9.13 M⊕

Mass (Jupiter)

0.029 M♃

Density

2.61 g/cm³

Surface Gravity

1.26 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.379

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

#881of 1978

top 44.5%

This planet

2.69R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1369 b 2.69 R⊕ Kepler-417 c 2.69 R⊕ HD 28109 b 2.69 R⊕

Metric	Earth	TOI-2134 b	Jupiter
Radius (R⊕)	1.00	2.69	11.21
Mass (M⊕)	1.00	9.13	317.83
Density (g/cm³)	5.51	2.61	1.33
Surface Gravity (g)	1.00	1.26	2.53
Insolation (S⊕)	1.00	32.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	9.130 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 75878355

Gaia DR2

Gaia DR2 4610267648427698816

Gaia DR3

Gaia DR3 4610267648427698816

System

TOI-2134

Percentile among Sub-Neptune cohort

Radius 2.690 R⊕ · percentile 55 / cohort 1978

Mass 9.130 M⊕ · percentile 66 / cohort 1978

Orbital period 9.23 d · percentile 31 / cohort 1946

Distance 22.62 pc · percentile 5 / cohort 1975

ESI 0.379 · percentile 48 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

9.229 days

Semi-major axis

0.0780 AU

Eccentricity

0.060

Inclination

89.49 °

Year Length

A year here lasts approximately 9.23 Earth days (2.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0780 AU.

Transit Fingerprint

Depth

0.161 %

Duration

2.995 h

Impact parameter b

0.210

Rp / R★

0.034750

Transit midpoint (BJD)

2,459,407.5449

Photometric dip

Transit produces a flux drop of 1,606 ppm lasting ≈ 3.00 h.

Extended Orbital Architecture

Planet / star radius ratio

0.034750

Semi-major axis / stellar radius

23.660

Impact parameter (b)

0.210

RV semi-amplitude (K)

3.400 m/s

Transit mid-time (BJD)

2,459,407.5449

Long. of periastron (ω)

109.00°

Angular separation (arcsec)

3.45000

Eq. Temperature

666K

(393 °C)

Insolation (S⊕)

32.00

Earth = 1.00

Earth Similarity (ESI)

0.379

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.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Rescigno et al. 2023

Instrument

TESS CCD Array

Publication

2023-10

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-2134

Spectral Class

K-type orange

Effective Temperature

4,580 K — cooler than the Sun (5,778 K)

Estimated Age

3.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.709 R☉

Stellar Mass

0.744 M☉

Metallicity [Fe/H]

0.12

Extended Stellar Properties

Surface gravity (log g)

4.800 dex

Stellar density

2.947 g/cm³

Rotational v·sin i

0.78 km/s

Rotation period

45.78 days

Activity index (log R'HK)

-4.830

Metallicity ratio

[Fe/H]

Distance

22.62 parsec

Light-years 73.78 ly

V-band magnitude

8.93 mag

Voyager-speed travel 1,301,060 yr

Multi-band Host Photometry — 7 bands

Astrometric Data

Parallax

44.179 mas

Total Proper Motion

288.225 mas/yr

PM Right Ascension

54.37 mas/yr

PM Declination

-283.05 mas/yr

Galactic Cartesian (pc)

x = 0.026 · y = -0.776 · z = 0.630

Equatorial (J2000)

RA 271.93550° · Dec 39.07293°

Galactic ℓ, b

65.871° · 24.730°

Ecliptic λ, β

273.250° · 62.490°

HTM-20 index

-1975808342

Similar Worlds

Kepler-417 c

Sub-Neptune · K-type orange

Radius 2.69 R⊕ · 3,176.7 ly

EPIC 212737443 c

Sub-Neptune · K-type orange

Radius 2.69 R⊕ · 1,096.7 ly

K2-268 c

Sub-Neptune · K-type orange

Radius 2.69 R⊕ · 1,069.1 ly

TOI-4504 b

Sub-Neptune · K-type orange

Radius 2.69 R⊕ · 1,117.4 ly

TOI-178 d

Sub-Neptune · K-type orange

Radius 2.70 R⊕ · 204.5 ly

Kepler-1539 b

Sub-Neptune · K-type orange

Radius 2.70 R⊕ · 2,440.7 ly

Explore Related Categories

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