Key parameters at a glance

A radius of 13.78 Earth radii
A mass of 533.95 Earth masses
Surface gravity around 2.81 g
An orbital period of 3.053 days
Semi-major axis 0.0405 AU
Equilibrium temperature 1,159 K (886 °C)
Distance from Earth 1,186.10 light-years
Earth Similarity Index 0.124
Travel time at Voyager 1 speed 20,916,853 years

Gaia-1 b Planet Profile

Physical Specs

Radius

13.78 R⊕

Radius (Jupiter)

1.229 R♃

Mass

533.95 M⊕

Mass (Jupiter)

1.680 M♃

Density

1.12 g/cm³

Surface Gravity

2.81 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.124

HZ Position Inner

Controversial No

Discovery

Year 2022

Method Transit

Facility European Space Agency (ESA) Gaia Satellite

Telescope 1.45 m x 0.5 m Telescope

Size rank in cohort

Rank by radius

#547of 1771

top 30.8%

This planet

13.78R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

ZTF J1230-2655 b 13.79 R⊕ TOI-3464 b 13.76 R⊕ TOI-3160 A b 13.76 R⊕

Metric	Earth	Gaia-1 b	Jupiter
Radius (R⊕)	1.00	13.78	11.21
Mass (M⊕)	1.00	533.95	317.83
Density (g/cm³)	5.51	1.12	1.33
Surface Gravity (g)	1.00	2.81	2.53
Insolation (S⊕)	1.00	426.54	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	533.952 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 11755687

Gaia DR2

Gaia DR2 3026325426682637824

Gaia DR3

Gaia DR3 3026325426682637824

System

Gaia-1

Percentile among Gas Giant cohort

Radius 13.776 R⊕ · percentile 69 / cohort 1771

Mass 533.952 M⊕ · percentile 50 / cohort 1747

Orbital period 3.05 d · percentile 16 / cohort 1533

Distance 363.66 pc · percentile 66 / cohort 1759

ESI 0.124 · percentile 33 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.053 days

Semi-major axis

0.0405 AU

Eccentricity

—

Inclination

85.73 °

Year Length

A year here lasts approximately 3.05 Earth days (0.8% of a terrestrial year) at a mean orbital distance of 0.0405 AU.

Transit Fingerprint

Depth

1.585 %

Duration

2.256 h

Transit midpoint (BJD)

2,458,468.6852

Photometric dip

Transit produces a flux drop of 15,853 ppm lasting ≈ 2.26 h.

Eq. Temperature

1,159K

(886 °C)

Insolation (S⊕)

426.54

Earth = 1.00

Earth Similarity (ESI)

0.124

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

Panahi et al. 2022

Instrument

Gaia CCD array

Publication

2022-05

Observation locale

Space

Host System: Gaia-1

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,470 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.952 R☉

Stellar Mass

0.949 M☉

Metallicity [Fe/H]

—

Distance

363.66 parsec

Light-years 1,186.10 ly

V-band magnitude

13.24 mag

Voyager-speed travel 20,916,853 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.721 mas

Total Proper Motion

41.110 mas/yr

PM Right Ascension

5.93 mas/yr

PM Declination

-40.68 mas/yr

Galactic Cartesian (pc)

x = -0.011 · y = 1.000 · z = -0.010

Equatorial (J2000)

RA 90.64367° · Dec -0.57711°

Galactic ℓ, b

207.815° · -11.122°

Ecliptic λ, β

90.701° · -24.015°

HTM-20 index

216659134