Temperature
5871 K
single adopted value
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Stellar HostProfile
HD 21520
Unclassified star • 79.21 pc
Records
4
literature rows
Planets
1
system count
References
4
distinct source labels
HD: HD 21520HIP: HIP 16038TIC: TIC 404518509
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: Nies et al. 2024 • System source: TICv8
Mass
1.09 Msun
1.06 to 1.09
Radius
1.04 Rsun
1.04 to 1.04
Age
5.30 Gyr
single adopted value
Luminosity
0.07 log(Lsun)
0.06 to 0.07
Distance
79.21 pc
single adopted value
Planets
1
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 1.04 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
HD 21520
1.04 R☉
System Layout
Known planets
1 planets linked to this host
HD 21520 b
Transit
◌
Discovery
2024
Period
25.13 days
Radius
2.70 R⊕
Mass
17.70 M⊕
Eq. Temp
637 K
HD 21520 and Its Neptune-Like Planet
HD 21520 is a star 258 light-years away with one known planet in orbit. The star is 5.3 billion years old, has 1.09 solar masses, and spans 1.04 solar radii. Its temperature is 5870 K.
The planet, HD 21520 b, is Neptune-like and was discovered by transit in 2024. It has an orbital period of 25.1 days and a radius of 2.7 Earth radii. Its mass is a reported upper limit of 17.7 Earth masses.
Provenance
Underlying measurements and references
Evidence Summary
Rows
4
Stellar refs
3
System refs
1
Distancestable
Parallaxstable
Temperaturestable
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitydisputed
Metallicitystable