Key parameters at a glance

A radius of 14.82 Earth radii
A mass of 259.67 Earth masses
Surface gravity around 1.18 g
An orbital period of 3.692 days
Semi-major axis 0.0467 AU
Equilibrium temperature 1,213 K (940 °C)
Distance from Earth 682.41 light-years
Earth Similarity Index 0.099
Travel time at Voyager 1 speed 12,034,351 years

Gaia-2 b Planet Profile

Physical Specs

Radius

14.82 R⊕

Radius (Jupiter)

1.322 R♃

Mass

259.67 M⊕

Mass (Jupiter)

0.817 M♃

Density

0.44 g/cm³

Surface Gravity

1.18 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.099

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

#250of 1771

top 14.1%

This planet

14.82R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

WASP-188 b 14.82 R⊕ KELT-23 A b 14.83 R⊕ WASP-68 b 14.80 R⊕

Metric	Earth	Gaia-2 b	Jupiter
Radius (R⊕)	1.00	14.82	11.21
Mass (M⊕)	1.00	259.67	317.83
Density (g/cm³)	5.51	0.44	1.33
Surface Gravity (g)	1.00	1.18	2.53
Insolation (S⊕)	1.00	512.02	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	259.666 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 147797743

Gaia DR2

Gaia DR2 1107980654748582144

Gaia DR3

Gaia DR3 1107980654748582144

System

Gaia-2

Percentile among Gas Giant cohort

Radius 14.818 R⊕ · percentile 86 / cohort 1771

Mass 259.666 M⊕ · percentile 28 / cohort 1747

Orbital period 3.69 d · percentile 25 / cohort 1533

Distance 209.23 pc · percentile 51 / cohort 1759

ESI 0.099 · percentile 26 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.692 days

Semi-major axis

0.0467 AU

Eccentricity

—

Inclination

85.21 °

Year Length

A year here lasts approximately 3.69 Earth days (1.0% of a terrestrial year) at a mean orbital distance of 0.0467 AU.

Transit Fingerprint

Depth

1.632 %

Duration

2.721 h

Transit midpoint (BJD)

2,458,843.9888

Photometric dip

Transit produces a flux drop of 16,316 ppm lasting ≈ 2.72 h.

Eq. Temperature

1,213K

(940 °C)

Insolation (S⊕)

512.02

Earth = 1.00

Earth Similarity (ESI)

0.099

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-2

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,720 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.064 R☉

Stellar Mass

1.000 M☉

Metallicity [Fe/H]

—

Distance

209.23 parsec

Light-years 682.41 ly

V-band magnitude

11.28 mag

Voyager-speed travel 12,034,351 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

4.751 mas

Total Proper Motion

25.004 mas/yr

PM Right Ascension

6.91 mas/yr

PM Declination

24.03 mas/yr

Galactic Cartesian (pc)

x = -0.137 · y = 0.362 · z = 0.922

Equatorial (J2000)

RA 110.73533° · Dec 67.25266°

Galactic ℓ, b

148.611° · 27.883°

Ecliptic λ, β

101.083° · 44.610°

HTM-20 index

-1723674286