Confirmed Exoplanet Discovered 2023

HIP 81208 C b

A gas giant orbiting the m-type red dwarf HIP 81208 C, located approximately 481.2 light-years from Earth.

Key parameters at a glance

  • A radius of 12.30 Earth radii
  • A mass of 4,703.86 Earth masses
  • Surface gravity around 31.09 g
  • An orbital period of 104,100.000 days
  • Semi-major axis 23.0400 AU
  • Equilibrium temperature 2,050 K (1777 °C)
  • Distance from Earth 481.19 light-years
  • Earth Similarity Index 0.062
  • Travel time at Voyager 1 speed 8,485,745 years

HIP 81208 C b Planet Profile

Physical Specs

Radius
12.30 R⊕
Radius (Jupiter)
1.090 R♃
Mass
4,703.86 M⊕
Mass (Jupiter)
14.800 M♃
Density
13.90 g/cm³
Surface Gravity
31.09 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.062
HZ Position Unknown
Controversial No

Discovery

Year 2023
Method Imaging
Facility Paranal Observatory
Telescope 8.2 m ESO VLT UT3 Melipal Telescope

Size rank in cohort

Rank by radius

#1349of 1771

top 76.1%

This planet

12.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HAT-P-13 c 12.30 R⊕ HD 22781 b 12.30 R⊕ CHXR 73 b 12.30 R⊕
Metric Earth HIP 81208 C b Jupiter
Radius (R⊕)1.0012.3011.21
Mass (M⊕)1.004,703.86317.83
Density (g/cm³)5.5113.901.33
Surface Gravity (g)1.0031.092.53
Insolation (S⊕)1.00—0.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 4,703.860 M⊕ Direct mass measurement (not derived).

Star Catalogue Identifiers

HIP

HIP 81208 C

System

HIP 81208

Percentile among Gas Giant cohort

Radius 12.300 R⊕ · percentile 22 / cohort 1771
Mass 4,703.860 M⊕ · percentile 93 / cohort 1747
Orbital period 104,100.00 d · percentile 99 / cohort 1533
Distance 147.53 pc · percentile 44 / cohort 1759
ESI 0.062 · percentile 10 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period
104,100.000 days
Semi-major axis
23.0400 AU
Eccentricity
—
Inclination
— °

Year Length

A year here lasts about 285.01 Earth years at a mean orbital distance of 23.0400 AU.

Eq. Temperature

2,050K

(1777 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.062

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Chomez et al. 2023

Instrument

SPHERE

Publication

2023-07

Observation locale

Ground

Discovery cohort

Planets confirmed in 2023 at Paranal Observatory (5 shown).

L 363-38 b · Sub-Neptune HD 169142 b · Gas Giant HIP 29442 d · Super-Earth HIP 29442 c · Super-Earth AF Lep b · Gas Giant

Host System: HIP 81208 C

Spectral Class

M-type red dwarf

Effective Temperature

—

Estimated Age

0.02 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

—

Stellar Mass

0.135 M☉

Metallicity [Fe/H]

—

Distance
147.53 parsec
Light-years 481.19 ly
V-band magnitude
— mag
Voyager-speed travel 8,485,745 yr

Astrometric Data

Parallax

6.750 mas

Total Proper Motion

27.437 mas/yr

PM Right Ascension

-9.61 mas/yr

PM Declination

-25.70 mas/yr

Galactic Cartesian (pc)

x = -0.293 · y = -0.757 · z = -0.584

Equatorial (J2000)

RA 248.80750° · Dec -35.72476°

Galactic ℓ, b

345.710° · 7.951°

Ecliptic λ, β

252.424° · -13.569°

HTM-20 index

-1333699975

Similar Worlds

USco CTIO 108 b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 469.7 ly

USco1556 b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 458.7 ly

Oph 11 b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 444.1 ly

2MASS J01033563-5515561 AB b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 153.9 ly

CHXR 73 b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 620.9 ly

GJ 676 A c

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 52.3 ly

Explore Related Categories

Gas Giant Planets Imaging Discoveries Paranal Observatory Mission M-type red dwarf Hosts