Key parameters at a glance
- A radius of 12.80 Earth radii
- A mass of 1,859.30 Earth masses
- Surface gravity around 11.35 g
- An orbital period of 1,293.000 days
- Semi-major axis 2.3530 AU
- Distance from Earth 101.65 light-years
- Earth Similarity Index 0.437
- Travel time at Voyager 1 speed 1,792,617 years
Context from the literature
HD 50554 b is a Jupiter-sized exoplanet with a minimum mass 4.4 times that of Jupiter. The planet was announced in 2001 by the European Southern Observatory and formally published in 2002 using observations from the Lick and Keck telescopes. In 2023, the inclination and true mass of HD 50554 b were determined via astrometry.
Excerpted from Wikipedia · full article
HD 50554 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1063of 1771
top 60.0%
This planet
12.80R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 50554 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.80 | 11.21 |
| Mass (M⊕) | 1.00 | 1,859.30 | 317.83 |
| Density (g/cm³) | 5.51 | 4.87 | 1.33 |
| Surface Gravity (g) | 1.00 | 11.35 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,859.296 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 1,574.464 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 50554
HIP
HIP 33212
TIC
TIC 80224448
Gaia DR2
Gaia DR2 3380479015342121600
Gaia DR3
Gaia DR3 3380479015342121600
System
HD 50554
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 3.54 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.3530 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
104.000 m/s
Transit mid-time (BJD)
2,453,200.5000
Long. of periastron (ω)
3.50°
Angular separation (arcsec)
75.50000
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
Fischer et al. 2002Instrument
Hamilton Echelle Spectrograph
Publication
2002-05
Observation locale
Ground
Discovery cohort
Planets confirmed in 2002 at Lick Observatory (3 shown).
Host System: HD 50554
Spectral Class
F-type yellow-white
Effective Temperature
5,987 K — hotter than the Sun (5,778 K)
Estimated Age
2.16 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.020 R☉
Stellar Mass
1.040 M☉
Metallicity [Fe/H]
-0.04
Extended Stellar Properties
Surface gravity (log g)
4.333 dex
Stellar density
1.085 g/cm³
Systemic radial velocity
-3.96 km/s
Rotational v·sin i
3.88 km/s
Activity index (log R'HK)
-4.950
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
32.057 mas
Total Proper Motion
103.324 mas/yr
PM Right Ascension
-35.91 mas/yr
PM Declination
-96.88 mas/yr
Galactic Cartesian (pc)
x = -0.216 · y = 0.886 · z = 0.411
Equatorial (J2000)
RA 103.67827° · Dec 24.24514°
Galactic ℓ, b
191.410° · 11.469°
Ecliptic λ, β
102.451° · 1.395°
HTM-20 index
243285710
Observation Record
Photometric series
1
RV measurements
5
Stellar spectra
2
Archive notes
1
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