Key parameters at a glance

A radius of 4.34 Earth radii
A mass of 17.40 Earth masses
Surface gravity around 0.92 g
An orbital period of 12.191 days
Semi-major axis 0.1190 AU
Equilibrium temperature 660 K (387 °C)
Distance from Earth 425.50 light-years
Earth Similarity Index 0.305
Travel time at Voyager 1 speed 7,503,747 years

TOI-470 b Planet Profile

Physical Specs

Radius

4.34 R⊕

Radius (Jupiter)

0.387 R♃

Mass

17.40 M⊕

Mass (Jupiter)

0.055 M♃

Density

1.17 g/cm³

Surface Gravity

0.92 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.305

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

#484of 574

top 84.1%

This planet

4.34R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HD 21693 c 4.34 R⊕ K2-245 b 4.34 R⊕ Kepler-413 b 4.35 R⊕

Metric	Earth	TOI-470 b	Jupiter
Radius (R⊕)	1.00	4.34	11.21
Mass (M⊕)	1.00	17.40	317.83
Density (g/cm³)	5.51	1.17	1.33
Surface Gravity (g)	1.00	0.92	2.53
Insolation (S⊕)	1.00	44.76	0.037

Star Catalogue Identifiers

TIC

TIC 37770169

Gaia DR2

Gaia DR2 2912264564319611136

Gaia DR3

Gaia DR3 2912264564319611136

System

TOI-470

Percentile among Neptune-like cohort

Radius 4.340 R⊕ · percentile 15 / cohort 574

Mass 17.400 M⊕ · percentile 20 / cohort 574

Orbital period 12.19 d · percentile 41 / cohort 524

Distance 130.46 pc · percentile 29 / cohort 572

ESI 0.305 · percentile 51 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

12.191 days

Semi-major axis

0.1190 AU

Eccentricity

—

Inclination

89.53 °

Year Length

A year here lasts approximately 12.19 Earth days (3.3% of a terrestrial year) at a mean orbital distance of 0.1190 AU.

Transit Fingerprint

Depth

0.228 %

Duration

3.063 h

Impact parameter b

0.253

Rp / R★

0.047700

Transit midpoint (BJD)

2,459,205.9825

Photometric dip

Transit produces a flux drop of 2,275 ppm lasting ≈ 3.06 h.

Extended Orbital Architecture

Planet / star radius ratio

0.047700

Semi-major axis / stellar radius

30.917

Impact parameter (b)

0.253

Transit mid-time (BJD)

2,459,205.9825

Angular separation (arcsec)

0.91200

Eq. Temperature

660K

(387 °C)

Insolation (S⊕)

44.76

Earth = 1.00

Earth Similarity (ESI)

0.305

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

Oddo et al. 2023

Instrument

TESS CCD Array

Publication

2023-03

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-470

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,190 K — cooler than the Sun (5,778 K)

Estimated Age

1.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.831 R☉

Stellar Mass

0.870 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

4.540 dex

Stellar density

2.043 g/cm³

Rotation period

18.28 days

Metallicity ratio

[Fe/H]

Distance

130.46 parsec

Light-years 425.50 ly

V-band magnitude

11.17 mag

Voyager-speed travel 7,503,747 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

7.636 mas

Total Proper Motion

85.144 mas/yr

PM Right Ascension

52.51 mas/yr

PM Declination

-67.02 mas/yr

Galactic Cartesian (pc)

x = -0.063 · y = 0.904 · z = -0.423

Equatorial (J2000)

RA 94.00990° · Dec -25.03141°

Galactic ℓ, b

232.202° · -18.481°

Ecliptic λ, β

95.472° · -48.395°

HTM-20 index

-1359104527