Key parameters at a glance

A radius of 8.47 Earth radii
A mass of 54.00 Earth masses
Surface gravity around 0.75 g
An orbital period of 14.844 days
Semi-major axis 0.1310 AU
Equilibrium temperature 745 K (472 °C)
Distance from Earth 1,261.83 light-years
Earth Similarity Index 0.198
Travel time at Voyager 1 speed 22,252,354 years

TOI-6448 b Planet Profile

Physical Specs

Radius

8.47 R⊕

Radius (Jupiter)

0.756 R♃

Mass

54.00 M⊕

Mass (Jupiter)

0.170 M♃

Density

0.49 g/cm³

Surface Gravity

0.75 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.198

HZ Position Inner

Controversial No

Discovery

Year 2025

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#123of 574

top 21.3%

This planet

8.47R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

WASP-148 b 8.47 R⊕ HD 102117 b 8.47 R⊕ Kepler-16 b 8.45 R⊕

Metric	Earth	TOI-6448 b	Jupiter
Radius (R⊕)	1.00	8.47	11.21
Mass (M⊕)	1.00	54.00	317.83
Density (g/cm³)	5.51	0.49	1.33
Surface Gravity (g)	1.00	0.75	2.53
Insolation (S⊕)	1.00	28.12	0.037

Star Catalogue Identifiers

TIC

TIC 320411045

Gaia DR2

Gaia DR2 5590921485126584832

Gaia DR3

Gaia DR3 5590921485126584832

System

TOI-6448

Percentile among Neptune-like cohort

Radius 8.474 R⊕ · percentile 78 / cohort 574

Mass 54.000 M⊕ · percentile 74 / cohort 574

Orbital period 14.84 d · percentile 45 / cohort 524

Distance 386.88 pc · percentile 53 / cohort 572

ESI 0.198 · percentile 27 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

14.844 days

Semi-major axis

0.1310 AU

Eccentricity

0.200

Inclination

88.95 °

Year Length

A year here lasts approximately 14.84 Earth days (4.1% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1310 AU.

Transit Fingerprint

Depth

0.725 %

Duration

3.528 h

Impact parameter b

0.510

Rp / R★

0.086600

Transit midpoint (BJD)

2,459,214.6136

Photometric dip

Transit produces a flux drop of 7,245 ppm lasting ≈ 3.53 h.

Extended Orbital Architecture

Planet / star radius ratio

0.086600

Semi-major axis / stellar radius

31.500

Impact parameter (b)

0.510

Transit mid-time (BJD)

2,459,214.6136

Long. of periastron (ω)

143.90°

Angular separation (arcsec)

0.33900

Eq. Temperature

745K

(472 °C)

Insolation (S⊕)

28.12

Earth = 1.00

Earth Similarity (ESI)

0.198

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Barber et al. 2025

Instrument

TESS CCD Array

Publication

2025-11

Observation locale

Space

Discovery cohort

Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-1266 d · Super-Earth TOI-2267 c · Rocky Terrestrial TOI-5799 c · Super-Earth TOI-5728 b · Super-Earth TOI-5716 b · Rocky Terrestrial TOI-7166 b · Sub-Neptune TOI-2267 b · Rocky Terrestrial TOI-2093 c · Sub-Neptune TOI-2267 d · Super-Earth TOI-5489 c · Super-Earth TOI-1743 b · Super-Earth TOI-4364 b · Sub-Neptune

Host System: TOI-6448

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,910 K — hotter than the Sun (5,778 K)

Estimated Age

0.03 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.897 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.510 dex

Stellar density

2.016 g/cm³

Rotational v·sin i

20.50 km/s

Rotation period

2.41 days

Distance

386.88 parsec

Light-years 1,261.83 ly

V-band magnitude

12.89 mag

Voyager-speed travel 22,252,354 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

2.556 mas

Total Proper Motion

9.610 mas/yr

PM Right Ascension

-8.14 mas/yr

PM Declination

5.10 mas/yr

Galactic Cartesian (pc)

x = -0.286 · y = 0.779 · z = -0.558

Equatorial (J2000)

RA 110.17041° · Dec -33.92233°

Galactic ℓ, b

246.435° · -9.235°

Ecliptic λ, β

120.144° · -55.270°

HTM-20 index

-80551476