Confirmed Exoplanet Discovered 2021

HIP 86221 b

A gas giant orbiting the k-type orange HIP 86221, located approximately 96.2 light-years from Earth.

Key parameters at a glance

  • A radius of 14.00 Earth radii
  • A mass of 225.66 Earth masses
  • Surface gravity around 1.15 g
  • An orbital period of 2.224 days
  • Semi-major axis 0.0310 AU
  • Distance from Earth 96.18 light-years
  • Earth Similarity Index 0.281
  • Travel time at Voyager 1 speed 1,696,183 years
  • Almost certainly tidally locked to its host star given the close orbit

HIP 86221 b Planet Profile

Physical Specs

Radius
14.00 R⊕
Radius (Jupiter)
1.250 R♃
Mass
225.66 M⊕
Mass (Jupiter)
0.710 M♃
Density
0.45 g/cm³
Surface Gravity
1.15 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.281
HZ Position Unknown
Controversial No

Discovery

Year 2021
Method Radial Velocity
Facility Cerro Tololo Inter-American Observatory
Telescope 1.5 m SMARTS telescope

Size rank in cohort

Rank by radius

#415of 1771

top 23.4%

This planet

14.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 9446 b 14.00 R⊕ HD 156411 b 14.00 R⊕ HD 224693 b 14.00 R⊕
Metric Earth HIP 86221 b Jupiter
Radius (R⊕)1.0014.0011.21
Mass (M⊕)1.00225.66317.83
Density (g/cm³)5.510.451.33
Surface Gravity (g)1.001.152.53
Insolation (S⊕)1.00—0.037

Alternative Mass Estimates

Method Value Interpretation
Minimum mass (M sin i) 225.658 M⊕ Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 86221

TIC

TIC 311407476

System

HIP 86221

Percentile among Gas Giant cohort

Radius 14.000 R⊕ · percentile 74 / cohort 1771
Mass 225.658 M⊕ · percentile 24 / cohort 1747
Orbital period 2.22 d · percentile 9 / cohort 1533
Distance 29.49 pc · percentile 7 / cohort 1759
ESI 0.281 · percentile 52 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period
2.224 days
Semi-major axis
0.0310 AU
Eccentricity
0.086
Inclination
— °

Year Length

A year here lasts approximately 2.22 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0310 AU.

Eq. Temperature

—

 

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.281

0 = alien, 1 = Earth-identical

Insufficient insolation data. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Paredes et al. 2021

Instrument

CHIRON spectrometer

Publication

2021-11

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at Cerro Tololo Inter-American Observatory (2 shown).

HIP 34222 b · Gas Giant HIP 5763 b · Gas Giant

Host System: HIP 86221

Spectral Class

K-type orange

Effective Temperature

—

Estimated Age

—

Stellar Radius

—

Stellar Mass

0.790 M☉

Metallicity [Fe/H]

—

Distance
29.49 parsec
Light-years 96.18 ly
V-band magnitude
9.25 mag
Voyager-speed travel 1,696,183 yr

Multi-band Host Photometry — 6 bands

6.310.410.35B9.25V8.03TESS7.00J6.43H6.30K

Astrometric Data

Parallax

33.910 mas

Total Proper Motion

252.971 mas/yr

PM Right Ascension

-82.21 mas/yr

PM Declination

239.24 mas/yr

Galactic Cartesian (pc)

x = -0.088 · y = -0.879 · z = 0.468

Equatorial (J2000)

RA 264.29488° · Dec 27.89639°

Galactic ℓ, b

51.909° · 27.630°

Ecliptic λ, β

261.940° · 51.176°

HTM-20 index

1073571562

Similar Worlds

HIP 18606 b

Gas Giant · K-type orange

Radius 14.00 R⊕ · 153.4 ly

BD-210397 b

Gas Giant · K-type orange

Radius 14.00 R⊕ · 77.4 ly

BD+55 362 b

Gas Giant · K-type orange

Radius 14.00 R⊕ · 171.5 ly

Qatar-2 b

Gas Giant · K-type orange

Radius 14.06 R⊕ · 591.6 ly

HD 2952 b

Gas Giant · K-type orange

Radius 13.90 R⊕ · 359.1 ly

HIP 111909 c

Gas Giant · K-type orange

Radius 13.90 R⊕ · 287.3 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Cerro Tololo Inter-American Observatory Mission K-type orange Hosts