Key parameters at a glance

A radius of 23.20 Earth radii
A mass of 1,398.45 Earth masses
Surface gravity around 2.60 g
An orbital period of 3.765 days
Semi-major axis 0.0815 AU
Equilibrium temperature 1,577 K (1304 °C)
Distance from Earth 768.03 light-years
Earth Similarity Index 0.069
Travel time at Voyager 1 speed 13,544,189 years

XO-6 b Planet Profile

Physical Specs

Radius

23.20 R⊕

Radius (Jupiter)

2.070 R♃

Mass

1,398.45 M⊕

Mass (Jupiter)

4.400 M♃

Density

0.62 g/cm³

Surface Gravity

2.60 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.069

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility XO

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#10of 1771

top 0.5%

This planet

23.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HAT-P-41 b 22.98 R⊕ TOI-3540 A b 23.54 R⊕ HIP 65 A b 22.75 R⊕

Metric	Earth	XO-6 b	Jupiter
Radius (R⊕)	1.00	23.20	11.21
Mass (M⊕)	1.00	1,398.45	317.83
Density (g/cm³)	5.51	0.62	1.33
Surface Gravity (g)	1.00	2.60	2.53
Insolation (S⊕)	1.00	580.39	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,398.452 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 138168780

Gaia DR2

Gaia DR2 1114308481600798336

Gaia DR3

Gaia DR3 1114308481603347584

System

XO-6

Percentile among Gas Giant cohort

Radius 23.203 R⊕ · percentile 99 / cohort 1771

Mass 1,398.452 M⊕ · percentile 73 / cohort 1747

Orbital period 3.77 d · percentile 26 / cohort 1533

Distance 235.48 pc · percentile 55 / cohort 1759

ESI 0.069 · percentile 13 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.765 days

Semi-major axis

0.0815 AU

Eccentricity

0.000

Inclination

86.00 °

Year Length

A year here lasts approximately 3.77 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0815 AU.

Transit Fingerprint

Depth

1.474 %

Duration

2.900 h

Impact parameter b

0.633

Rp / R★

0.110000

Transit midpoint (BJD)

2,456,652.7125

Photometric dip

Transit produces a flux drop of 14,735 ppm lasting ≈ 2.90 h.

Extended Orbital Architecture

Planet / star radius ratio

0.110000

Semi-major axis / stellar radius

9.080

Impact parameter (b)

0.633

RV semi-amplitude (K)

450.000 m/s

Transit mid-time (BJD)

2,456,652.7125

Sky-projected obliquity (λ)

-20.70°

Angular separation (arcsec)

0.34600

Eq. Temperature

1,577K

(1304 °C)

Insolation (S⊕)

580.39

Earth = 1.00

Earth Similarity (ESI)

0.069

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

Crouzet et al. 2017

Instrument

Apogee CCD Array

Publication

2017-03

Observation locale

Ground

Host System: XO-6

Spectral Class

F-type yellow-white

Effective Temperature

6,720 K — hotter than the Sun (5,778 K)

Estimated Age

1.88 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.930 R☉

Stellar Mass

1.470 M☉

Metallicity [Fe/H]

-0.07

Extended Stellar Properties

Surface gravity (log g)

4.040 dex

Stellar density

1.000 g/cm³

Systemic radial velocity

-1.58 km/s

Rotational v·sin i

48.00 km/s

Metallicity ratio

[Fe/H]

Distance

235.48 parsec

Light-years 768.03 ly

V-band magnitude

10.25 mag

Voyager-speed travel 13,544,189 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

4.218 mas

Total Proper Motion

28.061 mas/yr

PM Right Ascension

-16.64 mas/yr

PM Declination

-22.59 mas/yr

Galactic Cartesian (pc)

x = -0.023 · y = 0.278 · z = 0.960

Equatorial (J2000)

RA 94.79296° · Dec 73.82757°

Galactic ℓ, b

140.471° · 23.776°

Ecliptic λ, β

92.090° · 50.423°

HTM-20 index

1257331963