Temperature
4803 K
4790 to 4870
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Stellar HostProfile
HAT-P-18
K2 • 161.4 pc
Records
7
literature rows
Planets
1
system count
References
8
distinct source labels
TIC: TIC 21744120
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: Hartman et al. 2011 • System source: TICv8
Mass
0.77 Msun
0.77 to 0.77
Radius
0.75 Rsun
0.72 to 0.75
Age
12.40 Gyr
single adopted value
Luminosity
-0.57 log(Lsun)
-0.59 to -0.57
Distance
161.4 pc
single adopted value
Spectral Type
K2
Consistent across records
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.75 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
HAT-P-18
0.75 R☉
System Layout
Known planets
1 planets linked to this host
HAT-P-18 b
Transit
◌
Discovery
2010
Period
5.51 days
Radius
11.15 R⊕
Mass
62.61 M⊕
Eq. Temp
852 K
HAT-P-18 and Its Lone Planet
HAT-P-18 is a K2 star 526 light-years away with 0.77 solar masses, 0.749 solar radii, a temperature of 4800 K, and an age of 12.4 billion years. It hosts one known planet.
That planet, HAT-P-18 b, was discovered by transit in 2010. It is Jupiter-like, with a radius of 10.7 Earth radii and a mass of 55.5 Earth masses, both larger than Earth's corresponding values. Its orbital period is 5.51 days. Its mean density is 0.249 g/cm³, 0.0453 times Earth's. The star's mass and radius estimates are smaller than the Sun's, and its temperature is cooler.
Provenance
Underlying measurements and references
Evidence Summary
Rows
7
Stellar refs
7
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typestable
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 4803 | 0.77 | 0.75 | 12.40 | — | — | 161.4 | Bonomo et al. 2017 | TICv8 |
| — | 0.77 | — | — | — | — | 161.4 | Knutson et al. 2014 | TICv8 |
| 4790 | 0.77 | 0.74 | — | -0.59 | — | 161.4 | TICv8 | TICv8 |
| 4803 | 0.77 | 0.75 | 12.40 | -0.57 | K2 | 161.4 | Hartman et al. 2011 | TICv8 |
| 4804.2 | — | 0.73 | — | -0.59 | — | 161.4 | Gaia DR2 | TICv8 |
| 4870 | 0.77 | 0.72 | — | — | — | 161.4 | Esposito et al. 2014 | TICv8 |
| 4790 | — | 0.74 | — | — | — | 161.4 | ExoFOP | TICv8 |