Key parameters at a glance

A radius of 5.93 Earth radii
A mass of 20.31 Earth masses
Surface gravity around 0.58 g
An orbital period of 5.415 days
Semi-major axis 0.0580 AU
Equilibrium temperature 907 K (634 °C)
Distance from Earth 578.94 light-years
Earth Similarity Index 0.176
Travel time at Voyager 1 speed 10,209,605 years
Almost certainly tidally locked to its host star given the close orbit

3 siblings around TOI-4010

TOI-4010 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-4010 b	Sub-Neptune	3.02	11.00	1.348	1,441	2023
TOI-4010 c this	Neptune-like	5.93	20.31	5.415	907	2023
TOI-4010 d	Neptune-like	6.18	38.15	14.709	650	2023
TOI-4010 e	Gas Giant	13.30	692.00	762.000	174	2023

TOI-4010 c Planet Profile

Physical Specs

Radius

5.93 R⊕

Radius (Jupiter)

0.529 R♃

Mass

20.31 M⊕

Mass (Jupiter)

0.064 M♃

Density

0.50 g/cm³

Surface Gravity

0.58 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.176

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

#291of 574

top 50.5%

This planet

5.93R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

Kepler-943 b 5.93 R⊕ Kepler-281 d 5.94 R⊕ GJ 163 d 5.92 R⊕

Metric	Earth	TOI-4010 c	Jupiter
Radius (R⊕)	1.00	5.93	11.21
Mass (M⊕)	1.00	20.31	317.83
Density (g/cm³)	5.51	0.50	1.33
Surface Gravity (g)	1.00	0.58	2.53
Insolation (S⊕)	1.00	112.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	20.310 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 352682207

Gaia DR2

Gaia DR2 525352325110310400

Gaia DR3

Gaia DR3 525352325110310400

System

TOI-4010

Percentile among Neptune-like cohort

Radius 5.930 R⊕ · percentile 49 / cohort 574

Mass 20.310 M⊕ · percentile 30 / cohort 574

Orbital period 5.41 d · percentile 22 / cohort 524

Distance 177.50 pc · percentile 36 / cohort 572

ESI 0.176 · percentile 22 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

5.415 days

Semi-major axis

0.0580 AU

Eccentricity

0.030

Inclination

88.80 °

Year Length

A year here lasts approximately 5.41 Earth days (1.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0580 AU.

Transit Fingerprint

Depth

0.498 %

Duration

2.770 h

Impact parameter b

0.310

Rp / R★

0.065000

Transit midpoint (BJD)

2,459,000.0523

Photometric dip

Transit produces a flux drop of 4,983 ppm lasting ≈ 2.77 h.

Extended Orbital Architecture

Planet / star radius ratio

0.065000

Impact parameter (b)

0.310

RV semi-amplitude (K)

8.000 m/s

Transit mid-time (BJD)

2,459,000.0523

Long. of periastron (ω)

57.00°

Angular separation (arcsec)

0.32700

Eq. Temperature

907K

(634 °C)

Insolation (S⊕)

112.00

Earth = 1.00

Earth Similarity (ESI)

0.176

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

Kunimoto et al. 2023

Instrument

TESS CCD Array

Publication

2023-07

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-4010

Spectral Class

K-type orange

Effective Temperature

4,960 K — cooler than the Sun (5,778 K)

Estimated Age

6.10 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.830 R☉

Stellar Mass

0.880 M☉

Metallicity [Fe/H]

0.37

Extended Stellar Properties

Surface gravity (log g)

4.540 dex

Stellar density

1.652 g/cm³

Rotational v·sin i

1.30 km/s

Rotation period

37.70 days

Activity index (log R'HK)

-4.900

Metallicity ratio

[Fe/H]

Distance

177.50 parsec

Light-years 578.94 ly

V-band magnitude

12.29 mag

Voyager-speed travel 10,209,605 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

5.605 mas

Total Proper Motion

43.662 mas/yr

PM Right Ascension

38.62 mas/yr

PM Declination

-20.38 mas/yr

Galactic Cartesian (pc)

x = 0.381 · y = 0.140 · z = 0.914

Equatorial (J2000)

RA 20.21482° · Dec 66.07220°

Galactic ℓ, b

125.913° · 3.371°

Ecliptic λ, β

52.281° · 51.525°

HTM-20 index

-1102041226

Similar Worlds

WASP-156 b

Neptune-like · K-type orange

Radius 6.03 R⊕ · 398.1 ly

HD 103197 b

Neptune-like · K-type orange

Radius 5.83 R⊕ · 186.4 ly

TOI-532 b

Neptune-like · K-type orange

Radius 5.82 R⊕ · 440.5 ly

Kepler-1520 b

Neptune-like · K-type orange

Radius 5.77 R⊕ · 1,982.8 ly

HD 115404 A b

Neptune-like · K-type orange

Radius 6.09 R⊕ · 35.8 ly

K2-161 b

Neptune-like · K-type orange

Radius 6.12 R⊕ · 2,988.6 ly

Explore Related Categories

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