Temperature
4309 K
4234 to 4314.8
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Stellar HostProfile
Qatar-9
K5 V • 213.8 pc
Records
4
literature rows
Planets
1
system count
References
5
distinct source labels
TIC: TIC 149918151
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: Alsubai et al. 2019 • System source: TICv8
Mass
0.72 Msun
0.66 to 0.72
Radius
0.70 Rsun
0.70 to 0.77
Age
7.50 Gyr
single adopted value
Luminosity
-0.82 log(Lsun)
-0.82 to -0.77
Distance
213.8 pc
single adopted value
Spectral Type
K5 V
Consistent across records
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.70 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
Qatar-9
0.70 R☉
System Layout
Known planets
1 planets linked to this host
Qatar-9 b
Transit
◌
Discovery
2019
Period
1.54 days
Radius
11.31 R⊕
Mass
378.2 M⊕
Eq. Temp
1134 K
Qatar-9 and Its Lone Planet
Qatar-9 is a K-type main-sequence star located 697 light-years away. The star is 7.5 billion years old and has a mass of 0.719 solar masses and a radius of 0.696 solar radii. Its temperature is 4310 K, cooler than the Sun, and it is orbited by one known planet.
That planet, Qatar-9 b, is a Jupiter-like world discovered by the transit method in 2019 and completes an orbit in 1.54 days. It has a radius of 11.3 Earth radii and a mass of 378 Earth masses, roughly 1.19 times Jupiter's mass and larger than Earth in both respects. Its mean density is 1.44 g/cm³, 0.261 times Earth's.
Provenance
Underlying measurements and references
Evidence Summary
Rows
4
Stellar refs
4
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitydisputed
Metallicitystable
Spectral Typestable