Key parameters at a glance
- A radius of 12.50 Earth radii
- A mass of 3,098.83 Earth masses
- Surface gravity around 19.83 g
- An orbital period of 4,818.254 days
- Semi-major axis 5.4860 AU
- Distance from Earth 118.05 light-years
- Earth Similarity Index 0.387
- Travel time at Voyager 1 speed 2,081,821 years
1 sibling around HD 156279
HD 156279 c 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 156279 b | Gas Giant | 12.50 | 2,997.76 | 133.404 | — | 2011 |
| HD 156279 c this | Gas Giant | 12.50 | 3,098.83 | 4,818.254 | — | 2018 |
HD 156279 c 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 156279 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.50 | 11.21 |
| Mass (M⊕) | 1.00 | 3,098.83 | 317.83 |
| Density (g/cm³) | 5.51 | 8.72 | 1.33 |
| Surface Gravity (g) | 1.00 | 19.83 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 3,098.827 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 3,003.478 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 156279
HIP
HIP 84171
TIC
TIC 232606278
Gaia DR2
Gaia DR2 1631084478574318976
Gaia DR3
Gaia DR3 1631084478574318976
System
HD 156279
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 13.19 Earth years on a mildly elliptical path at a mean orbital distance of 5.4860 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
121.328 m/s
Transit mid-time (BJD)
2,455,834.7000
Long. of periastron (ω)
98.38°
Angular separation (arcsec)
152.00000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.387
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
Bryan et al. 2016Instrument
HIRES Spectrometer
Publication
2016-04
Observation locale
Ground
Discovery cohort
Planets confirmed in 2018 at W. M. Keck Observatory (12 shown).
Host System: HD 156279
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,453 K — cooler than the Sun (5,778 K)
Estimated Age
4.10 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.950 R☉
Stellar Mass
0.940 M☉
Metallicity [Fe/H]
0.14
Extended Stellar Properties
Surface gravity (log g)
4.460 dex
Stellar density
1.493 g/cm³
Systemic radial velocity
-20.64 km/s
Rotational v·sin i
2.51 km/s
Activity index (log R'HK)
-5.060
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
27.600 mas
Total Proper Motion
160.220 mas/yr
PM Right Ascension
-2.03 mas/yr
PM Declination
160.21 mas/yr
Galactic Cartesian (pc)
x = -0.093 · y = -0.439 · z = 0.894
Equatorial (J2000)
RA 258.09667° · Dec 63.35278°
Galactic ℓ, b
93.086° · 35.082°
Ecliptic λ, β
206.985° · 84.041°
HTM-20 index
-1643942942
Observation Record
Photometric series
1
RV measurements
1
Stellar spectra
3
Similar Worlds
HD 181234 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.50 R⊕ · 155.7 ly
HD 183263 c
Gas Giant · G-type yellow (Sun-like)
Radius 12.50 R⊕ · 176.8 ly
WASP-8 c
Gas Giant · G-type yellow (Sun-like)
Radius 12.50 R⊕ · 293.4 ly
HD 156279 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.50 R⊕ · 118.1 ly
OGLE-2019-BLG-0468L c
Gas Giant · G-type yellow (Sun-like)
Radius 12.50 R⊕ · 14,350.9 ly
TOI-1736 c
Gas Giant · G-type yellow (Sun-like)
Radius 12.50 R⊕ · 290.1 ly