Temperature
5434.3 K
5430 to 5458.3
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Stellar HostProfile
HD 21693
Unclassified star • 33.26 pc
Records
8
literature rows
Planets
2
system count
References
9
distinct source labels
HIP: HIP 16085HD: HD 21693TIC: TIC 197792776
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: TICv8 • System source: TICv8
Mass
0.95 Msun
0.80 to 0.95
Radius
0.92 Rsun
0.91 to 0.92
Luminosity
-0.17 log(Lsun)
-0.21 to -0.17
Distance
33.26 pc
single adopted value
Planets
2
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.92 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
HD 21693
0.92 R☉
System Layout
Known planets
2 planets linked to this host
HD 21693 b
Radial Velocity
◌
Discovery
2019
Period
22.68 days
Radius
—
Mass
8.23 M⊕
Eq. Temp
—
HD 21693 c
Radial Velocity
◌
Discovery
2019
Period
53.74 days
Radius
—
Mass
17.37 M⊕
Eq. Temp
—
HD 21693 and Its Two Known Planets
HD 21693 is a G8 V star located 108 light-years away. Its spectral type marks it as a main-sequence dwarf, and it is cooler than the Sun, with a reported temperature of 5430 K. The star's reported radius estimate is smaller than the Sun's, at 0.923 solar radii, and its mass is 0.95 solar masses. Two planets are known to orbit this host.
HD 21693 b and HD 21693 c were both discovered in 2019 using the radial velocity method, which measures the wobble a planet's gravity induces in its star's motion; repeated wobbles reveal the planet and its orbital period. HD 21693 b has a minimum mass of 8.23 Earth masses, larger than Earth's, and orbits in 22.7 days. HD 21693 c has a minimum mass of 17.4 Earth masses, also larger than Earth's, and orbits in 53.7 days.
Both minimum masses are lower bounds on the planets' true masses. Among the listed planets, HD 21693 b has the shortest year and the smallest minimum mass, while HD 21693 c has the longest year and the largest minimum mass.
Provenance
Underlying measurements and references
Evidence Summary
Rows
8
Stellar refs
8
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Luminositydisputed
Surface Gravitydisputed
Metallicitystable
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| — | — | — | — | — | G8 V | 33.26 | Michigan Catalog, Vol. 1 | TICv8 |
| 5430 | 0.80 | — | — | -0.21 | G8 V | 33.26 | Udry et al. 2019 | TICv8 |
| 5430 | 0.85 | — | — | -0.21 | — | 33.26 | Sousa et al. 2008 | TICv8 |
| — | — | — | — | — | G5 | 33.26 | Cannon & Pickering 1918 | TICv8 |
| — | — | — | — | — | — | 33.26 | Nordstrom et al. 2004 | TICv8 |
| 5434.3 | 0.95 | 0.92 | — | -0.17 | — | 33.26 | TICv8 | TICv8 |
| 5458.3 | — | 0.91 | — | -0.17 | — | 33.26 | Gaia DR2 | TICv8 |
| — | — | — | — | — | G9 IV-V | 33.26 | Gray et al. 2006 | TICv8 |