Key parameters at a glance

A radius of 3.24 Earth radii
A mass of 10.60 Earth masses
Surface gravity around 1.01 g
An orbital period of 25.057 days
Equilibrium temperature 689 K (415 °C)
Distance from Earth 466.85 light-years
Earth Similarity Index 0.332
Travel time at Voyager 1 speed 8,232,955 years

TOI-1230.01 Planet Profile

Physical Specs

Radius

3.24 R⊕

Radius (Jupiter)

0.289 R♃

Mass

10.60 M⊕

Mass (Jupiter)

0.033 M♃

Density

1.71 g/cm³

Surface Gravity

1.01 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.332

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

#323of 1978

top 16.3%

This planet

3.24R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 48948 d 3.24 R⊕ Kepler-742 b 3.24 R⊕ Kepler-860 b 3.24 R⊕

Metric	Earth	TOI-1230.01	Jupiter
Radius (R⊕)	1.00	3.24	11.21
Mass (M⊕)	1.00	10.60	317.83
Density (g/cm³)	5.51	1.71	1.33
Surface Gravity (g)	1.00	1.01	2.53
Insolation (S⊕)	1.00	53.14	0.037

Star Catalogue Identifiers

TIC

TIC 287156968

Gaia DR2

Gaia DR2 5193620487508460416

Gaia DR3

Gaia DR3 5193620487508460416

System

TOI-1230

Percentile among Sub-Neptune cohort

Radius 3.240 R⊕ · percentile 84 / cohort 1978

Mass 10.600 M⊕ · percentile 77 / cohort 1978

Orbital period 25.06 d · percentile 69 / cohort 1946

Distance 143.14 pc · percentile 25 / cohort 1975

ESI 0.332 · percentile 36 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

25.057 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 25.06 Earth days (6.9% of a terrestrial year).

Transit Fingerprint

Depth

0.053 %

Duration

7.542 h

Transit midpoint (BJD)

2,458,620.3167

Photometric dip

Transit produces a flux drop of 534 ppm lasting ≈ 7.54 h.

Eq. Temperature

689K

(415 °C)

Insolation (S⊕)

53.14

Earth = 1.00

Earth Similarity (ESI)

0.332

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

Giacalone et al. 2021

Instrument

TESS CCD Array

Publication

2021-01

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-1230

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,696 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.153 R☉

Stellar Mass

1.140 M☉

Metallicity [Fe/H]

—

Distance

143.14 parsec

Light-years 466.85 ly

V-band magnitude

10.25 mag

Voyager-speed travel 8,232,955 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

6.957 mas

Total Proper Motion

79.674 mas/yr

PM Right Ascension

20.31 mas/yr

PM Declination

-77.04 mas/yr

Galactic Cartesian (pc)

x = -0.051 · y = 0.095 · z = -0.994

Equatorial (J2000)

RA 118.12959° · Dec -83.82506°

Galactic ℓ, b

296.339° · -25.349°

Ecliptic λ, β

260.659° · -71.785°

HTM-20 index

-521513351