Key parameters at a glance
- A radius of 12.70 Earth radii
- A mass of 2,151.70 Earth masses
- Surface gravity around 13.34 g
- An orbital period of 2,675.576 days
- Semi-major axis 4.5500 AU
- Distance from Earth 398.97 light-years
- Earth Similarity Index 0.437
- Travel time at Voyager 1 speed 7,035,784 years
HIP 56640 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1130of 1771
top 63.7%
This planet
12.70R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HIP 56640 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.70 | 11.21 |
| Mass (M⊕) | 1.00 | 2,151.70 | 317.83 |
| Density (g/cm³) | 5.51 | 5.77 | 1.33 |
| Surface Gravity (g) | 1.00 | 13.34 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 2,151.698 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 1,166.430 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 100939
HIP
HIP 56640
TIC
TIC 181152368
Gaia DR2
Gaia DR2 5386076013538356992
Gaia DR3
Gaia DR3 5386076013538356992
System
HIP 56640
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 7.33 Earth years on a mildly elliptical path at a mean orbital distance of 4.5500 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.437
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
Jones et al. 2021Instrument
Multiple Instruments
Publication
2021-02
Observation locale
Ground
Discovery cohort
Planets confirmed in 2021 at Multiple Observatories (12 shown).
Host System: HIP 56640
Spectral Class
K-type orange
Effective Temperature
4,769 K — cooler than the Sun (5,778 K)
Estimated Age
9.15 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
4.930 R☉
Stellar Mass
1.750 M☉
Metallicity [Fe/H]
-0.03
Extended Stellar Properties
Surface gravity (log g)
2.910 dex
Rotational v·sin i
3.09 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
8.146 mas
Total Proper Motion
27.992 mas/yr
PM Right Ascension
23.85 mas/yr
PM Declination
-14.66 mas/yr
Galactic Cartesian (pc)
x = -0.794 · y = 0.081 · z = -0.602
Equatorial (J2000)
RA 174.20089° · Dec -37.03913°
Galactic ℓ, b
286.766° · 23.479°
Ecliptic λ, β
191.776° · -35.784°
HTM-20 index
810343166
Similar Worlds
HD 168863 b
Gas Giant · K-type orange
Radius 12.70 R⊕ · 130.1 ly
HD 27894 d
Gas Giant · K-type orange
Radius 12.70 R⊕ · 142.9 ly
eps CrB b
Gas Giant · K-type orange
Radius 12.70 R⊕ · 227.9 ly
HIP 67851 c
Gas Giant · K-type orange
Radius 12.70 R⊕ · 209.1 ly
HD 113996 b
Gas Giant · K-type orange
Radius 12.70 R⊕ · 379.4 ly
BD+03 2562 b
Gas Giant · K-type orange
Radius 12.70 R⊕ · 3,491.9 ly