Key parameters at a glance

A radius of 7.23 Earth radii
A mass of 147.15 Earth masses
Surface gravity around 2.82 g
An orbital period of 23.624 days
Semi-major axis 0.1630 AU
Equilibrium temperature 703 K (430 °C)
Distance from Earth 619.29 light-years
Earth Similarity Index 0.275
Travel time at Voyager 1 speed 10,921,156 years

1 sibling around TIC 139270665

TIC 139270665 b 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
TIC 139270665 b this	Neptune-like	7.23	147.15	23.624	703	2024
TIC 139270665 c	Gas Giant	12.90	1,554.18	1,010.000	200	2024

TIC 139270665 b Planet Profile

Physical Specs

Radius

7.23 R⊕

Radius (Jupiter)

0.645 R♃

Mass

147.15 M⊕

Mass (Jupiter)

0.463 M♃

Density

2.13 g/cm³

Surface Gravity

2.82 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.275

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

#189of 574

top 32.8%

This planet

7.23R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

Kepler-1085 b 7.22 R⊕ TOI-2134 c 7.27 R⊕ K2-271 b 7.28 R⊕

Metric	Earth	TIC 139270665 b	Jupiter
Radius (R⊕)	1.00	7.23	11.21
Mass (M⊕)	1.00	147.15	317.83
Density (g/cm³)	5.51	2.13	1.33
Surface Gravity (g)	1.00	2.82	2.53
Insolation (S⊕)	1.00	40.30	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	147.155 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	147.155 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 139270665

Gaia DR2

Gaia DR2 902448598271728256

Gaia DR3

Gaia DR3 902448598271728256

System

TIC 139270665

Percentile among Neptune-like cohort

Radius 7.230 R⊕ · percentile 67 / cohort 574

Mass 147.155 M⊕ · percentile 94 / cohort 574

Orbital period 23.62 d · percentile 55 / cohort 524

Distance 189.88 pc · percentile 38 / cohort 572

ESI 0.275 · percentile 44 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

23.624 days

Semi-major axis

0.1630 AU

Eccentricity

0.105

Inclination

89.76 °

Year Length

A year here lasts approximately 23.62 Earth days (6.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1630 AU.

Transit Fingerprint

Depth

0.425 %

Duration

5.940 h

Impact parameter b

0.160

Rp / R★

0.065190

Transit midpoint (BJD)

2,459,592.3661

Photometric dip

Transit produces a flux drop of 4,250 ppm lasting ≈ 5.94 h.

Extended Orbital Architecture

Planet / star radius ratio

0.065190

Semi-major axis / stellar radius

34.500

Impact parameter (b)

0.160

RV semi-amplitude (K)

32.400 m/s

Transit mid-time (BJD)

2,459,592.3661

Long. of periastron (ω)

-62.00°

Angular separation (arcsec)

0.85800

Eq. Temperature

703K

(430 °C)

Insolation (S⊕)

40.30

Earth = 1.00

Earth Similarity (ESI)

0.275

0 = alien, 1 = Earth-identical

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

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

Peluso et al. 2024

Instrument

TESS CCD Array

Publication

2024-04

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: TIC 139270665

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,844 K — hotter than the Sun (5,778 K)

Estimated Age

3.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.016 R☉

Stellar Mass

1.035 M☉

Metallicity [Fe/H]

0.16

Extended Stellar Properties

Surface gravity (log g)

4.439 dex

Stellar density

1.390 g/cm³

Rotational v·sin i

4.20 km/s

Metallicity ratio

[Fe/H]

Distance

189.88 parsec

Light-years 619.29 ly

V-band magnitude

10.39 mag

Voyager-speed travel 10,921,156 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

5.238 mas

Total Proper Motion

23.657 mas/yr

PM Right Ascension

12.79 mas/yr

PM Declination

-19.90 mas/yr

Galactic Cartesian (pc)

x = -0.468 · y = 0.693 · z = 0.549

Equatorial (J2000)

RA 124.03390° · Dec 33.29145°

Galactic ℓ, b

188.699° · 31.265°

Ecliptic λ, β

118.714° · 13.183°

HTM-20 index

-922733625