Key parameters at a glance
- A radius of 12.50 Earth radii
- A mass of 2,966.61 Earth masses
- Surface gravity around 18.99 g
- An orbital period of 1,603.389 days
- Semi-major axis 2.7490 AU
- Distance from Earth 214.18 light-years
- Earth Similarity Index 0.392
- Travel time at Voyager 1 speed 3,776,997 years
HD 191806 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1235of 1771
top 69.7%
This planet
12.50R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 191806 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.50 | 11.21 |
| Mass (M⊕) | 1.00 | 2,966.61 | 317.83 |
| Density (g/cm³) | 5.51 | 8.35 | 1.33 |
| Surface Gravity (g) | 1.00 | 18.99 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 2,966.610 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 2,707.912 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 191806
HIP
HIP 99306
TIC
TIC 294684871
Gaia DR2
Gaia DR2 2088526979830768512
Gaia DR3
Gaia DR3 2088526979830768512
System
HD 191806
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 4.39 Earth years on a mildly elliptical path at a mean orbital distance of 2.7490 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.392
0 = alien, 1 = Earth-identical
Detection Signatures
Radial velocity
Stellar wobble has been measured spectroscopically.
Astrometry
Positional wobble of the host star was measured.
Discovery Paper
Primary reference
D Iacute Az et al. 2016Instrument
SOPHIE Spectrograph
Publication
2016-07
Observation locale
Ground
Discovery cohort
Planets confirmed in 2016 at Haute-Provence Observatory (10 shown).
Host System: HD 191806
Spectral Class
K-type orange
Effective Temperature
6,010 K — hotter than the Sun (5,778 K)
Estimated Age
2.90 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.402 R☉
Stellar Mass
1.070 M☉
Metallicity [Fe/H]
0.30
Extended Stellar Properties
Surface gravity (log g)
4.450 dex
Stellar density
0.546 g/cm³
Systemic radial velocity
-15.36 km/s
Rotational v·sin i
3.30 km/s
Rotation period
20.60 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
15.200 mas
Total Proper Motion
146.027 mas/yr
PM Right Ascension
114.05 mas/yr
PM Declination
91.19 mas/yr
Galactic Cartesian (pc)
x = 0.328 · y = -0.517 · z = 0.791
Equatorial (J2000)
RA 302.36876° · Dec 52.27673°
Galactic ℓ, b
87.046° · 10.301°
Ecliptic λ, β
334.033° · 68.633°
HTM-20 index
-2063579930
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