Key parameters at a glance

A radius of 2.28 Earth radii
A mass of 9.79 Earth masses
Surface gravity around 1.88 g
An orbital period of 5.606 days
Semi-major axis 0.0600 AU
Equilibrium temperature 1,038 K (765 °C)
Distance from Earth 310.26 light-years
Earth Similarity Index 0.263
Travel time at Voyager 1 speed 5,471,500 years

1 sibling around TOI-763

TOI-763 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
TOI-763 b this	Sub-Neptune	2.28	9.79	5.606	1,038	2020
TOI-763 c	Sub-Neptune	2.63	9.32	12.274	800	2020

TOI-763 b Planet Profile

Physical Specs

Radius

2.28 R⊕

Radius (Jupiter)

0.203 R♃

Mass

9.79 M⊕

Mass (Jupiter)

0.031 M♃

Density

4.51 g/cm³

Surface Gravity

1.88 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.263

HZ Position Inner

Controversial No

Discovery

Year 2020

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#1536of 1978

top 77.6%

This planet

2.28R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

GJ 806 c 2.28 R⊕ Kepler-1020 b 2.28 R⊕ DMPP-6 b 2.28 R⊕

Metric	Earth	TOI-763 b	Jupiter
Radius (R⊕)	1.00	2.28	11.21
Mass (M⊕)	1.00	9.79	317.83
Density (g/cm³)	5.51	4.51	1.33
Surface Gravity (g)	1.00	1.88	2.53
Insolation (S⊕)	1.00	182.94	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	9.790 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	10.020 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 178819686

Gaia DR2

Gaia DR2 6140553127216043648

Gaia DR3

Gaia DR3 6140553127216043648

System

TOI-763

Percentile among Sub-Neptune cohort

Radius 2.280 R⊕ · percentile 22 / cohort 1978

Mass 9.790 M⊕ · percentile 71 / cohort 1978

Orbital period 5.61 d · percentile 15 / cohort 1946

Distance 95.13 pc · percentile 19 / cohort 1975

ESI 0.263 · percentile 19 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

5.606 days

Semi-major axis

0.0600 AU

Eccentricity

0.040

Inclination

— °

Year Length

A year here lasts approximately 5.61 Earth days (1.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0600 AU.

Transit Fingerprint

Depth

0.070 %

Duration

3.021 h

Impact parameter b

0.510

Rp / R★

0.023000

Transit midpoint (BJD)

2,458,572.1020

Photometric dip

Transit produces a flux drop of 701 ppm lasting ≈ 3.02 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023000

Impact parameter (b)

0.510

RV semi-amplitude (K)

3.790 m/s

Transit mid-time (BJD)

2,458,572.1020

Long. of periastron (ω)

42.00°

Angular separation (arcsec)

0.63100

Eq. Temperature

1,038K

(765 °C)

Insolation (S⊕)

182.94

Earth = 1.00

Earth Similarity (ESI)

0.263

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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

Fridlund et al. 2020

Instrument

TESS CCD Array

Publication

2020-11

Observation locale

Space

Discovery cohort

Planets confirmed in 2020 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-700 d · Rocky Terrestrial TOI-237 b · Super-Earth TOI-700 b · Rocky Terrestrial TOI-1266 c · Super-Earth LTT 3780 c · Sub-Neptune TOI-700 c · Sub-Neptune TOI-776 c · Sub-Neptune TOI-942 c · Neptune-like TOI-776 b · Super-Earth TOI-1266 b · Sub-Neptune TOI-540 b · Rocky Terrestrial LHS 1815 b · Rocky Terrestrial

Host System: TOI-763

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,450 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.897 R☉

Stellar Mass

0.917 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.450 dex

Stellar density

1.834 g/cm³

Systemic radial velocity

-13.68 km/s

Rotational v·sin i

1.70 km/s

Rotation period

27.00 days

Metallicity ratio

[Fe/H]

Distance

95.13 parsec

Light-years 310.26 ly

V-band magnitude

10.27 mag

Voyager-speed travel 5,471,500 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

10.484 mas

Total Proper Motion

114.489 mas/yr

PM Right Ascension

-76.90 mas/yr

PM Declination

-84.82 mas/yr

Galactic Cartesian (pc)

x = -0.744 · y = -0.192 · z = -0.640

Equatorial (J2000)

RA 194.46810° · Dec -39.75806°

Galactic ℓ, b

304.276° · 23.097°

Ecliptic λ, β

210.045° · -30.689°

HTM-20 index

-598258067