Key parameters at a glance
- A radius of 12.50 Earth radii
- A mass of 2,753.98 Earth masses
- Surface gravity around 17.63 g
- An orbital period of 2,448.487 days
- Semi-major axis 3.6780 AU
- Distance from Earth 187.88 light-years
- Earth Similarity Index 0.402
- Travel time at Voyager 1 speed 3,313,187 years
1 sibling around HD 74156
HD 74156 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 74156 b | Gas Giant | 13.50 | 532.36 | 51.636 | — | 2003 |
| HD 74156 c this | Gas Giant | 12.50 | 2,753.98 | 2,448.487 | — | 2003 |
HD 74156 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 74156 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.50 | 11.21 |
| Mass (M⊕) | 1.00 | 2,753.98 | 317.83 |
| Density (g/cm³) | 5.51 | 7.75 | 1.33 |
| Surface Gravity (g) | 1.00 | 17.63 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 2,753.983 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 2,541.579 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 74156
HIP
HIP 42723
TIC
TIC 379949822
Gaia DR2
Gaia DR2 582221750852254080
Gaia DR3
Gaia DR3 582221750852254080
System
HD 74156
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 6.70 Earth years on a highly eccentric trajectory at a mean orbital distance of 3.6780 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
113.940 m/s
Transit mid-time (BJD)
2,457,109.7000
Long. of periastron (ω)
271.93°
Angular separation (arcsec)
63.90000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.402
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
Naef et al. 2004Instrument
ELODIE Spectrograph
Publication
2004-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 2003 at Haute-Provence Observatory (3 shown).
Host System: HD 74156
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
6,068 K — hotter than the Sun (5,778 K)
Estimated Age
3.70 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.511 R☉
Stellar Mass
1.100 M☉
Metallicity [Fe/H]
0.13
Extended Stellar Properties
Surface gravity (log g)
4.139 dex
Stellar density
0.479 g/cm³
Systemic radial velocity
3.84 km/s
Rotational v·sin i
4.06 km/s
Activity index (log R'HK)
-5.080
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
17.332 mas
Total Proper Motion
201.783 mas/yr
PM Right Ascension
24.47 mas/yr
PM Declination
-200.29 mas/yr
Galactic Cartesian (pc)
x = -0.649 · y = 0.757 · z = 0.080
Equatorial (J2000)
RA 130.60478° · Dec 4.57723°
Galactic ℓ, b
221.986° · 26.705°
Ecliptic λ, β
131.777° · -13.169°
HTM-20 index
2025332893
Observation Record
Photometric series
1
RV measurements
4
Stellar spectra
3
Archive notes
1
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
HD 156279 c
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