Key parameters at a glance

A radius of 2.85 Earth radii
A mass of 20.80 Earth masses
Surface gravity around 2.55 g
An orbital period of 6.866 days
Semi-major axis 0.0770 AU
Equilibrium temperature 1,199 K (926 °C)
Distance from Earth 177.85 light-years
Earth Similarity Index 0.214
Travel time at Voyager 1 speed 3,136,470 years

TOI-480 b Planet Profile

Physical Specs

Radius

2.85 R⊕

Radius (Jupiter)

0.255 R♃

Mass

20.80 M⊕

Mass (Jupiter)

0.065 M♃

Density

4.91 g/cm³

Surface Gravity

2.55 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.214

HZ Position Inner

Controversial No

Discovery

Year 2024

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#683of 1978

top 34.5%

This planet

2.85R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 110067 d 2.85 R⊕ HD 135694 b 2.86 R⊕ Kepler-358 c 2.85 R⊕

Metric	Earth	TOI-480 b	Jupiter
Radius (R⊕)	1.00	2.85	11.21
Mass (M⊕)	1.00	20.80	317.83
Density (g/cm³)	5.51	4.91	1.33
Surface Gravity (g)	1.00	2.55	2.53
Insolation (S⊕)	1.00	531.52	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	20.800 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HIP

HIP 27849

TIC

TIC 317548889

Gaia DR2

Gaia DR2 2992025233741516928

Gaia DR3

Gaia DR3 2992025233741516928

System

TOI-480

Percentile among Sub-Neptune cohort

Radius 2.854 R⊕ · percentile 65 / cohort 1978

Mass 20.800 M⊕ · percentile 95 / cohort 1978

Orbital period 6.87 d · percentile 21 / cohort 1946

Distance 54.53 pc · percentile 12 / cohort 1975

ESI 0.214 · percentile 9 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

6.866 days

Semi-major axis

0.0770 AU

Eccentricity

0.000

Inclination

— °

Year Length

A year here lasts approximately 6.87 Earth days (1.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0770 AU.

Transit Fingerprint

Depth

0.033 %

Duration

3.571 h

Impact parameter b

0.469

Rp / R★

0.017586

Transit midpoint (BJD)

2,458,469.5659

Photometric dip

Transit produces a flux drop of 334 ppm lasting ≈ 3.57 h.

Extended Orbital Architecture

Planet / star radius ratio

0.017586

Impact parameter (b)

0.469

RV semi-amplitude (K)

5.900 m/s

Transit mid-time (BJD)

2,458,469.5659

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

1.41000

Eq. Temperature

1,199K

(926 °C)

Insolation (S⊕)

531.52

Earth = 1.00

Earth Similarity (ESI)

0.214

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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

Polanski et al. 2024

Instrument

TESS CCD Array

Publication

2024-06

Observation locale

Space

Discovery cohort

Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

Gliese 12 b · Rocky Terrestrial TOI-6002 b · Super-Earth TOI-5713 b · Super-Earth TOI-4336 A b · Sub-Neptune TOI-406.01 · Sub-Neptune TOI-1224 c · Sub-Neptune LHS 1678 d · Rocky Terrestrial TOI-2088 b · Sub-Neptune TOI-2120 b · Sub-Neptune TOI-1806.01 · Sub-Neptune TOI-4633 c · Sub-Neptune TOI-260 b · Super-Earth

Host System: TOI-480

Spectral Class

F-type yellow-white

Effective Temperature

6,174 K — hotter than the Sun (5,778 K)

Estimated Age

2.70 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.488 R☉

Stellar Mass

1.279 M☉

Metallicity [Fe/H]

0.16

Extended Stellar Properties

Surface gravity (log g)

4.194 dex

Stellar density

0.541 g/cm³

Metallicity ratio

[Fe/H]

Distance

54.53 parsec

Light-years 177.85 ly

V-band magnitude

7.28 mag

Voyager-speed travel 3,136,470 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

18.310 mas

Total Proper Motion

99.964 mas/yr

PM Right Ascension

-43.42 mas/yr

PM Declination

-90.04 mas/yr

Galactic Cartesian (pc)

x = 0.027 · y = 0.960 · z = -0.280

Equatorial (J2000)

RA 88.37846° · Dec -16.26540°

Galactic ℓ, b

221.486° · -19.960°

Ecliptic λ, β

87.973° · -39.693°

HTM-20 index

-1256195324