Key parameters at a glance

A radius of 13.90 Earth radii
A mass of 280.64 Earth masses
Surface gravity around 1.45 g
An orbital period of 30.330 days
Semi-major axis 0.1940 AU
Distance from Earth 313.07 light-years
Earth Similarity Index 0.298
Travel time at Voyager 1 speed 5,520,902 years

24 Boo b Planet Profile

Physical Specs

Radius

13.90 R⊕

Radius (Jupiter)

1.240 R♃

Mass

280.64 M⊕

Mass (Jupiter)

0.883 M♃

Density

0.57 g/cm³

Surface Gravity

1.45 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.298

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Radial Velocity

Facility Okayama Astrophysical Observatory

Telescope 1.88 m Telescope

Size rank in cohort

Rank by radius

#456of 1771

top 25.7%

This planet

13.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

24 Sex c 13.90 R⊕ HD 148156 b 13.90 R⊕ HD 134987 c 13.90 R⊕

Metric	Earth	24 Boo b	Jupiter
Radius (R⊕)	1.00	13.90	11.21
Mass (M⊕)	1.00	280.64	317.83
Density (g/cm³)	5.51	0.57	1.33
Surface Gravity (g)	1.00	1.45	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	280.642 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 127243

HIP

HIP 70791

TIC

TIC 441712711

Gaia DR2

Gaia DR2 1603662211901473408

Gaia DR3

Gaia DR3 1603662211901473408

System

24 Boo

Percentile among Gas Giant cohort

Radius 13.900 R⊕ · percentile 72 / cohort 1771

Mass 280.642 M⊕ · percentile 31 / cohort 1747

Orbital period 30.33 d · percentile 49 / cohort 1533

Distance 95.99 pc · percentile 34 / cohort 1759

ESI 0.298 · percentile 58 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

30.330 days

Semi-major axis

0.1940 AU

Eccentricity

0.032

Inclination

— °

Year Length

A year here lasts approximately 30.33 Earth days (8.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1940 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.298

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Takarada et al. 2018

Instrument

HIDES Echelle Spectrograph

Publication

2018-08

Observation locale

Ground

Discovery cohort

Planets confirmed in 2018 at Okayama Astrophysical Observatory (2 shown).

gam Lib c · Gas Giant gam Lib b · Gas Giant

Host System: 24 Boo

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,816 K — cooler than the Sun (5,778 K)

Estimated Age

6.92 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

12.190 R☉

Stellar Mass

1.050 M☉

Metallicity [Fe/H]

-0.78

Extended Stellar Properties

Surface gravity (log g)

2.280 dex

Systemic radial velocity

-7.77 km/s

Rotational v·sin i

3.36 km/s

Metallicity ratio

[Fe/H]

Distance

95.99 parsec

Light-years 313.07 ly

V-band magnitude

5.59 mag

Voyager-speed travel 5,520,902 yr

Multi-band Host Photometry — 7 bands

Astrometric Data

Parallax

10.390 mas

Total Proper Motion

307.647 mas/yr

PM Right Ascension

-304.06 mas/yr

PM Declination

-46.82 mas/yr

Galactic Cartesian (pc)

x = -0.514 · y = -0.389 · z = 0.764

Equatorial (J2000)

RA 217.15552° · Dec 49.84465°

Galactic ℓ, b

90.164° · 60.645°

Ecliptic λ, β

185.920° · 58.888°

HTM-20 index

-1490796185