Key parameters at a glance
- A radius of 12.30 Earth radii
- A mass of 4,003.68 Earth masses
- Surface gravity around 26.46 g
- An orbital period of 16,521.528 days
- Semi-major axis 12.4040 AU
- Distance from Earth 66.12 light-years
- Earth Similarity Index 0.351
- Travel time at Voyager 1 speed 1,166,037 years
HD 149806 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1349of 1771
top 76.1%
This planet
12.30R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 149806 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.30 | 11.21 |
| Mass (M⊕) | 1.00 | 4,003.68 | 317.83 |
| Density (g/cm³) | 5.51 | 11.80 | 1.33 |
| Surface Gravity (g) | 1.00 | 26.46 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4,003.684 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 149806
HIP
HIP 81375
TIC
TIC 281738302
Gaia DR2
Gaia DR2 4383374219923745024
Gaia DR3
Gaia DR3 4383374219923745024
System
HIP 81375
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 45.23 Earth years on a highly eccentric trajectory at a mean orbital distance of 12.4040 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.351
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Feng et al. 2022Instrument
Multiple Instruments
Publication
2022-09
Observation locale
Ground
Discovery cohort
Planets confirmed in 2022 at Multiple Observatories (12 shown).
Host System: HD 149806
Spectral Class
K-type orange
Effective Temperature
5,352 K — cooler than the Sun (5,778 K)
Estimated Age
8.36 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.890 R☉
Stellar Mass
0.930 M☉
Metallicity [Fe/H]
0.22
Extended Stellar Properties
Surface gravity (log g)
4.510 dex
Stellar density
1.940 g/cm³
Systemic radial velocity
10.80 km/s
Rotational v·sin i
0.90 km/s
Activity index (log R'HK)
-4.830
Metallicity ratio
[M/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
49.299 mas
Total Proper Motion
121.998 mas/yr
PM Right Ascension
93.24 mas/yr
PM Declination
78.67 mas/yr
Galactic Cartesian (pc)
x = -0.354 · y = -0.935 · z = 0.004
Equatorial (J2000)
RA 249.28552° · Dec 0.25468°
Galactic ℓ, b
16.343° · 29.617°
Ecliptic λ, β
247.555° · 22.095°
HTM-20 index
459052825
Observation Record
Photometric series
1
Stellar spectra
3
Archive notes
1
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