Temperature
6970 K
6429 to 6970
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Stellar HostProfile
XO-3
Unclassified star • 213.1 pc
Records
13
literature rows
Planets
1
system count
References
14
distinct source labels
TIC: TIC 8400842
Approximate color
from effective temperature
Canonical Summary
Adopted host values from one source row
Values come from the row with the most populated summary measurements. Missing values stay missing. Ranges and counts describe all source rows.
Stellar source: Rusznak et al. 2025 • System source: TICv8
Mass
1.45 Msun
0.58 to 1.45
Radius
1.52 Rsun
1.38 to 2.13
Age
0.97 Gyr
0.97 to 3
Luminosity
0.69 log(Lsun)
0.47 to 0.71
Distance
213.1 pc
single adopted value
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 1.52 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
XO-3
1.52 R☉
System Layout
Known planets
1 planets linked to this host
XO-3 b
Transit
◌
Discovery
2007
Period
3.19 days
Radius
14.80 R⊕
Mass
4217.6 M⊕
Eq. Temp
1890 K
XO-3 b: A Giant Planet Around a Hot Star
XO-3 is a single star system 695 light-years away, and it hosts one known planet. The host star is an F5 V main-sequence dwarf with an age of 0.97 billion years, a mass of 1.45 solar masses, a radius of 1.52 solar radii, and a temperature of 6970 K. Its mass and radius estimates are larger than the Sun's, and its temperature is hotter than the Sun's as well.
The planet, XO-3 b, was discovered in 2007 by the transit method, in which a planet passes in front of its star from our viewpoint and causes a small dip in observed brightness. It is classified as Jupiter-like, meaning its radius exceeds four times Earth's. XO-3 b has a mass of 4220 Earth masses, roughly 13.3 times Jupiter's mass, and it orbits its star every 3.19 days.
XO-3 b's radius is 14.8 Earth radii, larger than Earth's. Its mean density is 7.17 g/cm³, 1.3 times Earth's.
Provenance
Underlying measurements and references
Evidence Summary
Rows
13
Stellar refs
13
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agedisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 6781 | 1.41 | 1.49 | — | — | — | 213.1 | Tsantaki et al. 2014 | TICv8 |
| — | — | — | — | — | — | 213.1 | Garai et al. 2017 | TICv8 |
| 6673 | 1.41 | 1.69 | — | 0.71 | — | 213.1 | TICv8 | TICv8 |
| 6885.3 | — | 1.45 | — | 0.63 | — | 213.1 | Gaia DR2 | TICv8 |
| 6970 | 1.45 | 1.52 | 0.97 | 0.69 | — | 213.1 | Rusznak et al. 2025 | TICv8 |
| — | — | — | — | — | F5 V | 213.1 | Johns-Krull et al. 2007 | TICv8 |
| 6430 | 1.21 | 1.38 | 2.82 | — | — | 213.1 | Bonomo et al. 2017 | TICv8 |
| 6429 | 0.58 | 1.54 | — | — | — | 213.1 | Stassun et al. 2017 | TICv8 |
| 6429 | 1.41 | 2.13 | — | — | F5V | 213.1 | Johns-Krull et al. 2008 | TICv8 |
| 6429 | 1.21 | 1.41 | 3 | — | — | 213.1 | Southworth 2010 | TICv8 |
| 6429 | 1.21 | 1.38 | — | 0.47 | — | 213.1 | Winn et al. 2008 | TICv8 |
| — | 1.21 | — | — | — | — | 213.1 | Knutson et al. 2014 | TICv8 |
| 6673 | — | 1.69 | — | — | — | 213.1 | ExoFOP | TICv8 |