Confirmed Exoplanet Discovered 2003

HD 82943 c

A gas giant orbiting the g-type yellow (sun-like) HD 82943, located approximately 90.0 light-years from Earth.

Key parameters at a glance

  • A radius of 13.40 Earth radii
  • A mass of 622.60 Earth masses
  • Surface gravity around 3.47 g
  • An orbital period of 220.078 days
  • Semi-major axis 0.7435 AU
  • Distance from Earth 89.99 light-years
  • Earth Similarity Index 0.364
  • Travel time at Voyager 1 speed 1,586,922 years

1 sibling around HD 82943

HD 82943 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 82943 c this Gas Giant 13.40 622.60 220.078 — 2003
HD 82943 b Gas Giant 13.50 534.25 441.470 — 2003

HD 82943 c Planet Profile

Physical Specs

Radius
13.40 R⊕
Radius (Jupiter)
1.200 R♃
Mass
622.60 M⊕
Mass (Jupiter)
1.959 M♃
Density
1.42 g/cm³
Surface Gravity
3.47 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.364
HZ Position Unknown
Controversial No

Discovery

Year 2003
Method Radial Velocity
Facility La Silla Observatory
Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#730of 1771

top 41.2%

This planet

13.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 114783 c 13.40 R⊕ HIP 79431 b 13.40 R⊕ HD 68988 b 13.40 R⊕
Metric Earth HD 82943 c Jupiter
Radius (R⊕)1.0013.4011.21
Mass (M⊕)1.00622.60317.83
Density (g/cm³)5.511.421.33
Surface Gravity (g)1.003.472.53
Insolation (S⊕)1.00—0.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 622.603 M⊕ Direct mass measurement (not derived).
Minimum mass (M sin i) 639.000 M⊕ Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD

HD 82943

HIP

HIP 47007

TIC

TIC 405485269

Gaia DR2

Gaia DR2 5691782130578684544

Gaia DR3

Gaia DR3 5691782130578684544

System

HD 82943

Percentile among Gas Giant cohort

Radius 13.400 R⊕ · percentile 56 / cohort 1771
Mass 622.603 M⊕ · percentile 54 / cohort 1747
Orbital period 220.08 d · percentile 58 / cohort 1533
Distance 27.59 pc · percentile 7 / cohort 1759
ESI 0.364 · percentile 75 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period
220.078 days
Semi-major axis
0.7435 AU
Eccentricity
0.366
Inclination
90.00 °

Year Length

A year here lasts approximately 220.08 Earth days (60.3% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.7435 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

65.400 m/s

Transit mid-time (BJD)

2,455,135.1700

Long. of periastron (ω)

117.20°

Angular separation (arcsec)

26.90000

Eq. Temperature

—

 

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.364

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Mayor et al. 2004

Instrument

CORALIE Spectrograph

Publication

2004-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2003 at La Silla Observatory (11 shown).

HD 169830 c · Gas Giant HD 111232 b · Gas Giant HD 142415 b · Gas Giant HD 82943 b · Gas Giant HD 121504 b · Gas Giant HD 114386 b · Gas Giant HD 19994 b · Gas Giant HD 65216 b · Gas Giant HD 41004 B b · Gas Giant HD 216770 b · Gas Giant HD 6434 b · Gas Giant

Host System: HD 82943

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,935 K — hotter than the Sun (5,778 K)

Estimated Age

2.35 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.183 R☉

Stellar Mass

1.080 M☉

Metallicity [Fe/H]

0.26

Extended Stellar Properties

Surface gravity (log g)

4.326 dex

Stellar density

0.921 g/cm³

Systemic radial velocity

8.10 km/s

Rotational v·sin i

1.70 km/s

Activity index (log R'HK)

-4.920

Metallicity ratio

[M/H]

Distance
27.59 parsec
Light-years 89.99 ly
V-band magnitude
6.55 mag
Voyager-speed travel 1,586,922 yr

Multi-band Host Photometry — 11 bands

5.07.27.17B6.55V6.39Gaia5.98TESS5.51J5.25H5.11K5.19W14.97W25.57W35.13W4

Astrometric Data

Parallax

36.216 mas

Total Proper Motion

174.725 mas/yr

PM Right Ascension

1.51 mas/yr

PM Declination

-174.72 mas/yr

Galactic Cartesian (pc)

x = -0.788 · y = 0.579 · z = -0.210

Equatorial (J2000)

RA 143.71140° · Dec -12.13030°

Galactic ℓ, b

245.843° · 28.251°

Ecliptic λ, β

150.417° · -25.022°

HTM-20 index

493887

Observation Record

Photometric series

1

RV measurements

1

Stellar spectra

3

Archive notes

1

Similar Worlds

HD 159243 c

Gas Giant · G-type yellow (Sun-like)

Radius 13.40 R⊕ · 239.1 ly

HD 12648 b

Gas Giant · G-type yellow (Sun-like)

Radius 13.40 R⊕ · 594.2 ly

HD 65216 c

Gas Giant · G-type yellow (Sun-like)

Radius 13.40 R⊕ · 114.5 ly

TOI-2981 b

Gas Giant · G-type yellow (Sun-like)

Radius 13.40 R⊕ · 1,721.4 ly

HD 4313 b

Gas Giant · G-type yellow (Sun-like)

Radius 13.40 R⊕ · 444.6 ly

HD 68988 b

Gas Giant · G-type yellow (Sun-like)

Radius 13.40 R⊕ · 198.4 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries La Silla Observatory Mission G-type yellow (Sun-like) Hosts