Key parameters at a glance

A radius of 9.30 Earth radii
A mass of 127.13 Earth masses
Surface gravity around 1.47 g
An orbital period of 6.388 days
Semi-major axis 0.0520 AU
Equilibrium temperature 565 K (292 °C)
Distance from Earth 485.20 light-years
Earth Similarity Index 0.283
Travel time at Voyager 1 speed 8,556,434 years
Almost certainly tidally locked to its host star given the close orbit

TOI-530 b Planet Profile

Physical Specs

Radius

9.30 R⊕

Radius (Jupiter)

0.830 R♃

Mass

127.13 M⊕

Mass (Jupiter)

0.400 M♃

Density

0.93 g/cm³

Surface Gravity

1.47 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.283

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#60of 574

top 10.3%

This planet

9.30R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

Kepler-856 b 9.30 R⊕ TOI-2986 b 9.29 R⊕ HD 33142 d 9.32 R⊕

Metric	Earth	TOI-530 b	Jupiter
Radius (R⊕)	1.00	9.30	11.21
Mass (M⊕)	1.00	127.13	317.83
Density (g/cm³)	5.51	0.93	1.33
Surface Gravity (g)	1.00	1.47	2.53
Insolation (S⊕)	1.00	14.26	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	127.131 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 387690507

Gaia DR2

Gaia DR2 3353218995355814656

Gaia DR3

Gaia DR3 3353218995355814656

System

TOI-530

Percentile among Neptune-like cohort

Radius 9.303 R⊕ · percentile 90 / cohort 574

Mass 127.131 M⊕ · percentile 93 / cohort 574

Orbital period 6.39 d · percentile 26 / cohort 524

Distance 148.76 pc · percentile 32 / cohort 572

ESI 0.283 · percentile 46 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

6.388 days

Semi-major axis

0.0520 AU

Eccentricity

0.000

Inclination

89.10 °

Year Length

A year here lasts approximately 6.39 Earth days (1.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0520 AU.

Transit Fingerprint

Depth

2.399 %

Duration

2.566 h

Impact parameter b

0.330

Rp / R★

0.155000

Transit midpoint (BJD)

2,458,470.1998

Photometric dip

Transit produces a flux drop of 23,994 ppm lasting ≈ 2.57 h.

Extended Orbital Architecture

Planet / star radius ratio

0.155000

Semi-major axis / stellar radius

20.970

Impact parameter (b)

0.330

RV semi-amplitude (K)

66.500 m/s

Transit mid-time (BJD)

2,458,470.1998

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

0.35000

Eq. Temperature

565K

(292 °C)

Insolation (S⊕)

14.26

Earth = 1.00

Earth Similarity (ESI)

0.283

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

Gan et al. 2022

Instrument

TESS CCD Array

Publication

2022-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-2257 b · Sub-Neptune TOI-2285 b · Super-Earth TOI-1231 b · Sub-Neptune AU Mic c · Sub-Neptune LHS 1678 c · Rocky Terrestrial LHS 1478 b · Rocky Terrestrial TOI-2406 b · Sub-Neptune HD 207897 b · Sub-Neptune TOI-269 b · Sub-Neptune TIC 172900988 b · Gas Giant TOI-178 g · Sub-Neptune TOI-2076 d · Sub-Neptune

Host System: TOI-530

Spectral Class

M-type red dwarf

Effective Temperature

3,659 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.540 R☉

Stellar Mass

0.530 M☉

Metallicity [Fe/H]

0.38

Extended Stellar Properties

Surface gravity (log g)

4.700 dex

Stellar density

4.278 g/cm³

Systemic radial velocity

-25.93 km/s

Metallicity ratio

[Fe/H]

Distance

148.76 parsec

Light-years 485.20 ly

V-band magnitude

15.40 mag

Voyager-speed travel 8,556,434 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

6.694 mas

Total Proper Motion

64.055 mas/yr

PM Right Ascension

13.68 mas/yr

PM Declination

-62.58 mas/yr

Galactic Cartesian (pc)

x = -0.226 · y = 0.948 · z = 0.223

Equatorial (J2000)

RA 103.41283° · Dec 12.88158°

Galactic ℓ, b

201.669° · 6.317°

Ecliptic λ, β

103.268° · -9.942°

HTM-20 index

815552400