Key parameters at a glance

A radius of 12.40 Earth radii
A mass of 3,464.65 Earth masses
Surface gravity around 22.53 g
An orbital period of 10,159.643 days
Semi-major axis 9.8110 AU
Distance from Earth 85.40 light-years
Earth Similarity Index 0.371
Travel time at Voyager 1 speed 1,506,116 years

2 siblings around HD 142

HD 142 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 142 A d	Gas Giant	10.90	82.64	108.453	—	2022
HD 142 b	Gas Giant	12.70	2,256.58	351.434	—	2001
HD 142 c this	Gas Giant	12.40	3,464.65	10,159.643	—	2012

HD 142 c Planet Profile

Physical Specs

Radius

12.40 R⊕

Radius (Jupiter)

1.110 R♃

Mass

3,464.65 M⊕

Mass (Jupiter)

10.901 M♃

Density

9.99 g/cm³

Surface Gravity

22.53 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.371

HZ Position Unknown

Controversial No

Discovery

Year 2012

Method Radial Velocity

Facility Anglo-Australian Telescope

Telescope 3.9 m Anglo-Australian Telescope

Size rank in cohort

Rank by radius

#1298of 1771

top 73.2%

This planet

12.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 110014 b 12.40 R⊕ CFBDSIR J145829+101343 b 12.40 R⊕ MOA-2010-BLG-073L b 12.40 R⊕

Metric	Earth	HD 142 c	Jupiter
Radius (R⊕)	1.00	12.40	11.21
Mass (M⊕)	1.00	3,464.65	317.83
Density (g/cm³)	5.51	9.99	1.33
Surface Gravity (g)	1.00	22.53	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3,464.647 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	1,684.400 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 142

HIP

HIP 522

TIC

TIC 389757979

Gaia DR2

Gaia DR2 4976894960284258048

Gaia DR3

Gaia DR3 4976894960284258048

System

HD 142

Percentile among Gas Giant cohort

Radius 12.400 R⊕ · percentile 25 / cohort 1771

Mass 3,464.647 M⊕ · percentile 89 / cohort 1747

Orbital period 10,159.64 d · percentile 96 / cohort 1533

Distance 26.19 pc · percentile 6 / cohort 1759

ESI 0.371 · percentile 77 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

10,159.643 days

Semi-major axis

9.8110 AU

Eccentricity

0.277

Inclination

90.37 °

Year Length

A year here lasts about 27.82 Earth years on a mildly elliptical path at a mean orbital distance of 9.8110 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.371

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Wittenmyer et al. 2012

Instrument

UCLES Spectrograph

Publication

2012-07

Observation locale

Ground

Host System: HD 142

Spectral Class

F-type yellow-white

Effective Temperature

6,245 K — hotter than the Sun (5,778 K)

Estimated Age

3.12 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.470 R☉

Stellar Mass

1.210 M☉

Metallicity [Fe/H]

0.09

Extended Stellar Properties

Surface gravity (log g)

4.620 dex

Stellar density

0.550 g/cm³

Systemic radial velocity

5.44 km/s

Rotational v·sin i

10.40 km/s

Metallicity ratio

[Fe/H]

Distance

26.19 parsec

Light-years 85.40 ly

V-band magnitude

5.70 mag

Voyager-speed travel 1,506,116 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

38.161 mas

Total Proper Motion

576.468 mas/yr

PM Right Ascension

575.03 mas/yr

PM Declination

-40.69 mas/yr

Galactic Cartesian (pc)

x = 0.655 · y = 0.018 · z = -0.756

Equatorial (J2000)

RA 1.58368° · Dec -49.07536°

Galactic ℓ, b

321.581° · -66.388°

Ecliptic λ, β

336.554° · -44.461°

HTM-20 index

1910038462

Observation Record

Photometric series

RV measurements

Archive notes