Key parameters at a glance

A radius of 14.20 Earth radii
A mass of 162.09 Earth masses
Surface gravity around 0.80 g
An orbital period of 385.200 days
Semi-major axis 1.1800 AU
Distance from Earth 171.55 light-years
Earth Similarity Index 0.255
Travel time at Voyager 1 speed 3,025,271 years

ups Leo b Planet Profile

Physical Specs

Radius

14.20 R⊕

Radius (Jupiter)

1.270 R♃

Mass

162.09 M⊕

Mass (Jupiter)

0.510 M♃

Density

0.31 g/cm³

Surface Gravity

0.80 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.255

HZ Position Unknown

Controversial No

Discovery

Year 2021

Method Radial Velocity

Facility Okayama Astrophysical Observatory

Telescope 1.88 m Telescope

Size rank in cohort

Rank by radius

#334of 1771

top 18.8%

This planet

14.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

OGLE-2011-BLG-0251L b 14.20 R⊕ HIP 57274 c 14.20 R⊕ HD 187123 b 14.20 R⊕

Metric	Earth	ups Leo b	Jupiter
Radius (R⊕)	1.00	14.20	11.21
Mass (M⊕)	1.00	162.09	317.83
Density (g/cm³)	5.51	0.31	1.33
Surface Gravity (g)	1.00	0.80	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	162.092 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 49430557

Gaia DR2

Gaia DR2 3794167001116433152

Gaia DR3

Gaia DR3 3794167001116704000

System

ups Leo

Percentile among Gas Giant cohort

Radius 14.200 R⊕ · percentile 79 / cohort 1771

Mass 162.092 M⊕ · percentile 13 / cohort 1747

Orbital period 385.20 d · percentile 63 / cohort 1533

Distance 52.60 pc · percentile 21 / cohort 1759

ESI 0.255 · percentile 46 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

385.200 days

Semi-major axis

1.1800 AU

Eccentricity

0.320

Inclination

— °

Year Length

A year here lasts about 1.05 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.1800 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.255

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Teng et al. 2021

Instrument

HIDES Echelle Spectrograph

Publication

2021-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at Okayama Astrophysical Observatory (7 shown).

gam Psc b · Gas Giant HD 99283 b · Gas Giant HD 219139 b · Gas Giant HD 360 b · Gas Giant HD 79181 b · Gas Giant HD 161178 b · Gas Giant HD 10975 b · Gas Giant

Host System: ups Leo

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,836 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

11.220 R☉

Stellar Mass

1.480 M☉

Metallicity [Fe/H]

-0.20

Extended Stellar Properties

Surface gravity (log g)

2.460 dex

Rotational v·sin i

1.78 km/s

Metallicity ratio

[Fe/H]

Distance

52.60 parsec

Light-years 171.55 ly

V-band magnitude

4.30 mag

Voyager-speed travel 3,025,271 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

18.994 mas

Total Proper Motion

42.335 mas/yr

PM Right Ascension

2.78 mas/yr

PM Declination

42.24 mas/yr

Galactic Cartesian (pc)

x = -0.995 · y = 0.100 · z = -0.014

Equatorial (J2000)

RA 174.23722° · Dec -0.82356°

Galactic ℓ, b

267.263° · 56.799°

Ecliptic λ, β

175.033° · -3.045°

HTM-20 index

-1979925546