Key parameters at a glance

A radius of 2.25 Earth radii
A mass of 5.67 Earth masses
Surface gravity around 1.12 g
An orbital period of 14.650 days
Semi-major axis 0.1195 AU
Equilibrium temperature 580 K (307 °C)
Distance from Earth 260.16 light-years
Earth Similarity Index 0.452
Travel time at Voyager 1 speed 4,587,978 years

TOI-1777.01 Planet Profile

Physical Specs

Radius

2.25 R⊕

Radius (Jupiter)

0.200 R♃

Mass

5.67 M⊕

Mass (Jupiter)

0.018 M♃

Density

2.75 g/cm³

Surface Gravity

1.12 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.452

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

#1605of 1978

top 81.1%

This planet

2.25R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-375 b 2.24 R⊕ Kepler-300 c 2.25 R⊕ GJ 667 C b 2.25 R⊕

Metric	Earth	TOI-1777.01	Jupiter
Radius (R⊕)	1.00	2.25	11.21
Mass (M⊕)	1.00	5.67	317.83
Density (g/cm³)	5.51	2.75	1.33
Surface Gravity (g)	1.00	1.12	2.53
Insolation (S⊕)	1.00	71.34	0.037

Star Catalogue Identifiers

HIP

HIP 49576

TIC

TIC 29191624

Gaia DR2

Gaia DR2 810069697186043264

Gaia DR3

Gaia DR3 810069697186043264

System

TOI-1777

Percentile among Sub-Neptune cohort

Radius 2.246 R⊕ · percentile 19 / cohort 1978

Mass 5.670 M⊕ · percentile 19 / cohort 1978

Orbital period 14.65 d · percentile 50 / cohort 1946

Distance 79.77 pc · percentile 17 / cohort 1975

ESI 0.452 · percentile 63 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

14.650 days

Semi-major axis

0.1195 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 14.65 Earth days (4.0% of a terrestrial year) at a mean orbital distance of 0.1195 AU.

Transit Fingerprint

Depth

0.033 %

Duration

2.643 h

Rp / R★

0.020900

Transit midpoint (BJD)

2,459,635.1067

Photometric dip

Transit produces a flux drop of 330 ppm lasting ≈ 2.64 h.

Eq. Temperature

580K

(307 °C)

Insolation (S⊕)

71.34

Earth = 1.00

Earth Similarity (ESI)

0.452

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

Crossfield et al. 2024

Instrument

TESS CCD Array

Publication

2024-11

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: TOI-1777

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,859 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.980 R☉

Stellar Mass

1.060 M☉

Metallicity [Fe/H]

—

Distance

79.77 parsec

Light-years 260.16 ly

V-band magnitude

9.31 mag

Voyager-speed travel 4,587,978 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

12.508 mas

Total Proper Motion

22.119 mas/yr

PM Right Ascension

-0.71 mas/yr

PM Declination

-22.11 mas/yr

Galactic Cartesian (pc)

x = -0.611 · y = 0.328 · z = 0.721

Equatorial (J2000)

RA 151.80703° · Dec 46.11488°

Galactic ℓ, b

171.412° · 52.551°

Ecliptic λ, β

136.134° · 32.072°

HTM-20 index

1081770618