Key parameters at a glance

A radius of 13.20 Earth radii
A mass of 888.01 Earth masses
Surface gravity around 5.10 g
An orbital period of 176.130 days
Semi-major axis 0.7620 AU
Distance from Earth 441.26 light-years
Earth Similarity Index 0.391
Travel time at Voyager 1 speed 7,781,672 years

HD 145457 b Planet Profile

Physical Specs

Radius

13.20 R⊕

Radius (Jupiter)

1.180 R♃

Mass

888.01 M⊕

Mass (Jupiter)

2.794 M♃

Density

2.12 g/cm³

Surface Gravity

5.10 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.391

HZ Position Unknown

Controversial No

Discovery

Year 2010

Method Radial Velocity

Facility Subaru Telescope

Telescope 8.2 m Subaru Telescope

Size rank in cohort

Rank by radius

#847of 1771

top 47.8%

This planet

13.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 c 13.20 R⊕ HD 37605 b 13.20 R⊕ MOA-2009-BLG-387L b 13.20 R⊕

Metric	Earth	HD 145457 b	Jupiter
Radius (R⊕)	1.00	13.20	11.21
Mass (M⊕)	1.00	888.01	317.83
Density (g/cm³)	5.51	2.12	1.33
Surface Gravity (g)	1.00	5.10	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	888.013 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 145457

HIP

HIP 79219

TIC

TIC 236339228

Gaia DR2

Gaia DR2 1315900158983769472

Gaia DR3

Gaia DR3 1315900158983769472

System

HD 145457

Percentile among Gas Giant cohort

Radius 13.200 R⊕ · percentile 49 / cohort 1771

Mass 888.013 M⊕ · percentile 64 / cohort 1747

Orbital period 176.13 d · percentile 56 / cohort 1533

Distance 135.29 pc · percentile 41 / cohort 1759

ESI 0.391 · percentile 83 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

176.130 days

Semi-major axis

0.7620 AU

Eccentricity

0.111

Inclination

— °

Year Length

A year here lasts approximately 176.13 Earth days (48.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.7620 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.391

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Sato et al. 2010

Instrument

HDS Spectrograph

Publication

2010-08

Observation locale

Ground

Host System: HD 145457

Spectral Class

K-type orange

Effective Temperature

4,757 K — cooler than the Sun (5,778 K)

Estimated Age

2.60 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

9.900 R☉

Stellar Mass

1.900 M☉

Metallicity [Fe/H]

-0.14

Extended Stellar Properties

Surface gravity (log g)

2.770 dex

Systemic radial velocity

-3.15 km/s

Metallicity ratio

[Fe/H]

Distance

135.29 parsec

Light-years 441.26 ly

V-band magnitude

6.57 mag

Voyager-speed travel 7,781,672 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

7.363 mas

Total Proper Motion

41.137 mas/yr

PM Right Ascension

-18.34 mas/yr

PM Declination

36.82 mas/yr

Galactic Cartesian (pc)

x = -0.412 · y = -0.792 · z = 0.450

Equatorial (J2000)

RA 242.51622° · Dec 26.74291°

Galactic ℓ, b

44.302° · 46.030°

Ecliptic λ, β

233.044° · 46.718°

HTM-20 index

643152085

Similar Worlds

KMT-2024-BLG-1209L b

Gas Giant · K-type orange

Radius 13.20 R⊕ · 12,817.9 ly

HD 37605 b

Gas Giant · K-type orange

Radius 13.20 R⊕ · 152.6 ly

OGLE-2003-BLG-235L b

Gas Giant · K-type orange

Radius 13.20 R⊕ · 18,917.0 ly

HD 1502 b

Gas Giant · K-type orange

Radius 13.20 R⊕ · 622.8 ly

HD 12661 c

Gas Giant · K-type orange

Radius 13.20 R⊕ · 123.4 ly

HD 181342 b

Gas Giant · K-type orange

Radius 13.20 R⊕ · 392.7 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Subaru Telescope Mission K-type orange Hosts