Key parameters at a glance

A radius of 15.39 Earth radii
A mass of 225.34 Earth masses
Surface gravity around 0.95 g
An orbital period of 2.864 days
Semi-major axis 0.0442 AU
Equilibrium temperature 1,743 K (1470 °C)
Distance from Earth 763.69 light-years
Earth Similarity Index 0.062
Travel time at Voyager 1 speed 13,467,690 years

XO-7 b Planet Profile

Physical Specs

Radius

15.39 R⊕

Radius (Jupiter)

1.373 R♃

Mass

225.34 M⊕

Mass (Jupiter)

0.709 M♃

Density

0.34 g/cm³

Surface Gravity

0.95 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.062

HZ Position Inner

Controversial No

Discovery

Year 2019

Method Transit

Facility XO

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#206of 1771

top 11.6%

This planet

15.39R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-778 b 15.40 R⊕ HAT-P-23 b 15.33 R⊕ Kepler-91 b 15.32 R⊕

Metric	Earth	XO-7 b	Jupiter
Radius (R⊕)	1.00	15.39	11.21
Mass (M⊕)	1.00	225.34	317.83
Density (g/cm³)	5.51	0.34	1.33
Surface Gravity (g)	1.00	0.95	2.53
Insolation (S⊕)	1.00	1,540.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	225.341 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 268403451

Gaia DR2

Gaia DR2 2303332931542914048

Gaia DR3

Gaia DR3 2303332931542914048

System

XO-7

Percentile among Gas Giant cohort

Radius 15.390 R⊕ · percentile 88 / cohort 1771

Mass 225.341 M⊕ · percentile 24 / cohort 1747

Orbital period 2.86 d · percentile 14 / cohort 1533

Distance 234.15 pc · percentile 54 / cohort 1759

ESI 0.062 · percentile 10 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2.864 days

Semi-major axis

0.0442 AU

Eccentricity

0.038

Inclination

83.45 °

Year Length

A year here lasts approximately 2.86 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0442 AU.

Transit Fingerprint

Depth

0.909 %

Duration

2.772 h

Impact parameter b

0.709

Rp / R★

0.095320

Transit midpoint (BJD)

2,457,917.4750

Photometric dip

Transit produces a flux drop of 9,090 ppm lasting ≈ 2.77 h.

Extended Orbital Architecture

Planet / star radius ratio

0.095320

Semi-major axis / stellar radius

6.430

Impact parameter (b)

0.709

RV semi-amplitude (K)

80.500 m/s

Transit mid-time (BJD)

2,457,917.4750

Sky-projected obliquity (λ)

0.00°

True obliquity (ψ)

70.00°

Angular separation (arcsec)

0.18900

Eq. Temperature

1,743K

(1470 °C)

Insolation (S⊕)

1,540.00

Earth = 1.00

Earth Similarity (ESI)

0.062

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. 2020

Instrument

Apogee CCD Array

Publication

2020-02

Observation locale

Ground

Host System: XO-7

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

6,250 K — hotter than the Sun (5,778 K)

Estimated Age

1.18 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.480 R☉

Stellar Mass

1.405 M☉

Metallicity [Fe/H]

0.43

Extended Stellar Properties

Surface gravity (log g)

4.246 dex

Stellar density

0.451 g/cm³

Systemic radial velocity

-12.98 km/s

Rotational v·sin i

6.00 km/s

Rotation period

3.62 days

Metallicity ratio

[Fe/H]

Distance

234.15 parsec

Light-years 763.69 ly

V-band magnitude

10.52 mag

Voyager-speed travel 13,467,690 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

4.242 mas

Total Proper Motion

28.880 mas/yr

PM Right Ascension

-15.35 mas/yr

PM Declination

24.46 mas/yr

Galactic Cartesian (pc)

x = 0.011 · y = -0.082 · z = 0.997

Equatorial (J2000)

RA 277.47808° · Dec 85.23332°

Galactic ℓ, b

117.581° · 27.474°

Ecliptic λ, β

88.065° · 71.277°

HTM-20 index

1315998100