Temperature
5966 K
5937 to 6076
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Stellar HostProfile
HD 217786
F8 V • 55.48 pc
Records
8
literature rows
Planets
2
system count
References
9
distinct source labels
HIP: HIP 113834HD: HD 217786TIC: TIC 248048656
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: Moutou et al. 2011 • System source: TICv8
Mass
1.02 Msun
1.02 to 1.14
Radius
1.27 Rsun
1.27 to 1.34
Age
7.60 Gyr
single adopted value
Luminosity
0.28 log(Lsun)
0.28 to 0.30
Distance
55.48 pc
single adopted value
Spectral Type
F8 V
Multiple classifications reported
Planets
2
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 1.27 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
HD 217786
1.27 R☉
System Layout
Known planets
2 planets linked to this host
HD 217786 b
Radial Velocity
◌
Discovery
2011
Period
1301.4 days
Radius
—
Mass
4402.6 M⊕
Eq. Temp
—
HD 217786 c
Radial Velocity
◌
Discovery
2022
Period
2.52 days
Radius
—
Mass
7.31 M⊕
Eq. Temp
—
HD 217786 and Its Two Known Planets
HD 217786 is a binary star system 181 light-years away. The host star is an F8 V dwarf with an age of 7.6 billion years, a mass of 1.02 solar masses, and a radius of 1.27 solar radii. Its temperature of 5970 K is hotter than the Sun's, and its reported radius estimate is larger than the Sun's. Two planets have been found orbiting this star.
The first, HD 217786 b, was discovered in 2011 by the radial velocity method, which detects the wobble a planet's gravity induces in its star's motion. It has a mass of 4400 Earth masses - roughly 13.9 times Jupiter's mass - and an orbital period of 1300 days, the longest among the listed planets.
HD 217786 c was discovered in 2022, also by radial velocity. Its minimum mass is 7.31 Earth masses, a lower bound on its true mass rather than a direct estimate. It completes an orbit in 2.52 days, the shortest period among the listed planets.
Provenance
Underlying measurements and references
Evidence Summary
Rows
8
Stellar refs
8
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitydisputed
Metallicitystable
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 5937 | — | 1.34 | — | 0.30 | — | 55.48 | Gaia DR2 | TICv8 |
| — | 1.14 | — | — | — | — | 55.48 | Feng et al. 2022 | TICv8 |
| 5966 | 1.02 | — | — | — | F8 V | 55.48 | Xiao et al. 2023 | TICv8 |
| — | — | — | — | — | F8 V | 55.48 | Michigan Catalog, Vol. 5 | TICv8 |
| — | — | — | — | — | — | 55.48 | Nordstrom et al. 2004 | TICv8 |
| 5966 | 1.02 | 1.27 | 7.60 | 0.28 | F8 V | 55.48 | Moutou et al. 2011 | TICv8 |
| 6076 | 1.14 | 1.27 | — | 0.30 | — | 55.48 | TICv8 | TICv8 |
| — | — | — | — | — | G5 | 55.48 | Cannon & Pickering 1918 | TICv8 |