Key parameters at a glance

A radius of 13.10 Earth radii
A mass of 975.74 Earth masses
Surface gravity around 5.69 g
An orbital period of 1,299.000 days
Semi-major axis 2.7800 AU
Distance from Earth 317.12 light-years
Earth Similarity Index 0.400
Travel time at Voyager 1 speed 5,592,466 years

HD 142245 b Planet Profile

Physical Specs

Radius

13.10 R⊕

Radius (Jupiter)

1.170 R♃

Mass

975.74 M⊕

Mass (Jupiter)

3.070 M♃

Density

2.39 g/cm³

Surface Gravity

5.69 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.400

HZ Position Unknown

Controversial No

Discovery

Year 2011

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#910of 1771

top 51.3%

This planet

13.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

GJ 3021 b 13.10 R⊕ HD 221287 b 13.10 R⊕ HD 37605 c 13.10 R⊕

Metric	Earth	HD 142245 b	Jupiter
Radius (R⊕)	1.00	13.10	11.21
Mass (M⊕)	1.00	975.74	317.83
Density (g/cm³)	5.51	2.39	1.33
Surface Gravity (g)	1.00	5.69	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	975.738 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 142245

HIP

HIP 77783

TIC

TIC 172607132

Gaia DR2

Gaia DR2 1193193836691820032

Gaia DR3

Gaia DR3 1193193836691820032

System

HD 142245

Percentile among Gas Giant cohort

Radius 13.100 R⊕ · percentile 46 / cohort 1771

Mass 975.738 M⊕ · percentile 66 / cohort 1747

Orbital period 1,299.00 d · percentile 81 / cohort 1533

Distance 97.23 pc · percentile 34 / cohort 1759

ESI 0.400 · percentile 86 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,299.000 days

Semi-major axis

2.7800 AU

Eccentricity

0.000

Inclination

— °

Year Length

A year here lasts about 3.56 Earth years on a nearly circular orbit at a mean orbital distance of 2.7800 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.400

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Johnson et al. 2011

Instrument

HIRES Spectrometer

Publication

2011-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2011 at W. M. Keck Observatory (12 shown).

HD 5891 b · Gas Giant HD 102329 b · Gas Giant HD 18742 b · Gas Giant CFBDSIR J145829+101343 b · Gas Giant HD 1502 b · Gas Giant HD 108863 b · Gas Giant HD 82886 b · Gas Giant HD 106270 b · Gas Giant HD 98219 b · Gas Giant HD 152581 b · Gas Giant HD 131496 b · Gas Giant HD 30856 b · Gas Giant

Host System: HD 142245

Spectral Class

K-type orange

Effective Temperature

4,922 K — cooler than the Sun (5,778 K)

Estimated Age

2.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

4.630 R☉

Stellar Mass

3.500 M☉

Metallicity [Fe/H]

0.17

Extended Stellar Properties

Surface gravity (log g)

3.650 dex

Systemic radial velocity

6.63 km/s

Rotational v·sin i

2.66 km/s

Metallicity ratio

[Fe/H]

Distance

97.23 parsec

Light-years 317.12 ly

V-band magnitude

7.46 mag

Voyager-speed travel 5,592,466 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

10.256 mas

Total Proper Motion

61.460 mas/yr

PM Right Ascension

-57.48 mas/yr

PM Declination

-21.76 mas/yr

Galactic Cartesian (pc)

x = -0.507 · y = -0.820 · z = 0.266

Equatorial (J2000)

RA 238.23424° · Dec 15.43061°

Galactic ℓ, b

26.944° · 46.384°

Ecliptic λ, β

231.849° · 34.758°

HTM-20 index

-1452515283

Observation Record

Photometric series

Stellar spectra

Archive notes

Similar Worlds

HD 4732 c

Gas Giant · K-type orange

Radius 13.10 R⊕ · 178.7 ly

HD 37605 c

Gas Giant · K-type orange

Radius 13.10 R⊕ · 152.6 ly

HD 102843 b

Gas Giant · K-type orange

Radius 13.10 R⊕ · 204.7 ly

HD 112570 b

Gas Giant · K-type orange

Radius 13.10 R⊕ · 330.0 ly

KOINTREAU-3 b

Gas Giant · K-type orange

Radius 13.10 R⊕ · 458.5 ly

HD 69123 b

Gas Giant · K-type orange

Radius 13.10 R⊕ · 245.0 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries W. M. Keck Observatory Mission K-type orange Hosts