Key parameters at a glance

A radius of 2.47 Earth radii
A mass of 7.24 Earth masses
Surface gravity around 1.19 g
An orbital period of 18.088 days
Semi-major axis 0.1060 AU
Equilibrium temperature 373 K (100 °C)
Distance from Earth 169.44 light-years
Earth Similarity Index 0.645
Travel time at Voyager 1 speed 2,988,057 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around TOI-1470

TOI-1470 c 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-1470 b	Sub-Neptune	2.18	7.32	2.527	734	2023
TOI-1470 c this	Sub-Neptune	2.47	7.24	18.088	373	2023

TOI-1470 c Planet Profile

Physical Specs

Radius

2.47 R⊕

Radius (Jupiter)

0.220 R♃

Mass

7.24 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.66 g/cm³

Surface Gravity

1.19 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.645

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

#1226of 1978

top 61.9%

This planet

2.47R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-263 c 2.47 R⊕ Kepler-1101 b 2.47 R⊕ Kepler-269 b 2.47 R⊕

Metric	Earth	TOI-1470 c	Jupiter
Radius (R⊕)	1.00	2.47	11.21
Mass (M⊕)	1.00	7.24	317.83
Density (g/cm³)	5.51	2.66	1.33
Surface Gravity (g)	1.00	1.19	2.53
Insolation (S⊕)	1.00	3.35	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	7.240 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 284441182

Gaia DR2

Gaia DR2 427224073427887360

Gaia DR3

Gaia DR3 427224073427887360

System

TOI-1470

Percentile among Sub-Neptune cohort

Radius 2.470 R⊕ · percentile 37 / cohort 1978

Mass 7.240 M⊕ · percentile 44 / cohort 1978

Orbital period 18.09 d · percentile 58 / cohort 1946

Distance 51.95 pc · percentile 12 / cohort 1975

ESI 0.645 · percentile 87 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

18.088 days

Semi-major axis

0.1060 AU

Eccentricity

0.500

Inclination

89.47 °

Year Length

A year here lasts approximately 18.09 Earth days (5.0% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1060 AU.

Transit Fingerprint

Depth

0.232 %

Duration

2.700 h

Impact parameter b

0.470

Rp / R★

0.048100

Transit midpoint (BJD)

2,458,772.1760

Photometric dip

Transit produces a flux drop of 2,315 ppm lasting ≈ 2.70 h.

Extended Orbital Architecture

Planet / star radius ratio

0.048100

Semi-major axis / stellar radius

48.460

Impact parameter (b)

0.470

RV semi-amplitude (K)

2.910 m/s

Transit mid-time (BJD)

2,458,772.1760

Angular separation (arcsec)

2.04000

Eq. Temperature

373K

(100 °C)

Insolation (S⊕)

3.35

Earth = 1.00

Earth Similarity (ESI)

0.645

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

Gonz Aacute Lez Aacute Lvarez 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-198 b · Super-Earth TOI-244 b · Super-Earth TOI-4184 b · Sub-Neptune TOI-904 b · Sub-Neptune

Host System: TOI-1470

Spectral Class

M-type red dwarf

Effective Temperature

3,709 K — cooler than the Sun (5,778 K)

Estimated Age

1.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.469 R☉

Stellar Mass

0.471 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.770 dex

Stellar density

5.846 g/cm³

Rotational v·sin i

2.00 km/s

Rotation period

29.00 days

Metallicity ratio

[Fe/H]

Distance

51.95 parsec

Light-years 169.44 ly

V-band magnitude

13.46 mag

Voyager-speed travel 2,988,057 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

19.220 mas

Total Proper Motion

73.832 mas/yr

PM Right Ascension

48.58 mas/yr

PM Declination

-55.60 mas/yr

Galactic Cartesian (pc)

x = 0.474 · y = 0.084 · z = 0.876

Equatorial (J2000)

RA 10.08914° · Dec 61.21339°

Galactic ℓ, b

121.598° · -1.630°

Ecliptic λ, β

41.938° · 50.403°

HTM-20 index

936677337