Key parameters at a glance
- A radius of 12.70 Earth radii
- A mass of 2,142.16 Earth masses
- Surface gravity around 13.28 g
- An orbital period of 484.170 days
- Semi-major axis 1.6180 AU
- Distance from Earth 434.55 light-years
- Earth Similarity Index 0.437
- Travel time at Voyager 1 speed 7,663,243 years
1 sibling around HD 87816
HD 87816 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| HD 87816 b this | Gas Giant | 12.70 | 2,142.16 | 484.170 | — | 2025 |
| HD 87816 c | Gas Giant | 12.40 | 3,877.51 | 7,596.000 | — | 2025 |
HD 87816 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 | HD 87816 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.70 | 11.21 |
| Mass (M⊕) | 1.00 | 2,142.16 | 317.83 |
| Density (g/cm³) | 5.51 | 5.75 | 1.33 |
| Surface Gravity (g) | 1.00 | 13.28 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 2,142.163 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 87816
HIP
HIP 49477
TIC
TIC 138998040
Gaia DR2
Gaia DR2 5404921677215434112
Gaia DR3
Gaia DR3 5404921677218538496
System
HD 87816
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 1.33 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.6180 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.437
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Fontanet et al. 2025Instrument
CORALIE Spectrograph
Publication
2025-05
Observation locale
Ground
Discovery cohort
Planets confirmed in 2025 at La Silla Observatory (12 shown).
Host System: HD 87816
Spectral Class
K-type orange
Effective Temperature
4,989 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
9.000 R☉
Stellar Mass
2.410 M☉
Metallicity [Fe/H]
0.14
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
7.477 mas
Total Proper Motion
58.051 mas/yr
PM Right Ascension
-55.72 mas/yr
PM Declination
16.29 mas/yr
Galactic Cartesian (pc)
x = -0.539 · y = 0.292 · z = -0.790
Equatorial (J2000)
RA 151.52965° · Dec -52.18787°
Galactic ℓ, b
279.018° · 2.836°
Ecliptic λ, β
184.887° · -57.255°
HTM-20 index
-1284584493
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
HIP 56640 b
Gas Giant · K-type orange
Radius 12.70 R⊕ · 399.0 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