Key parameters at a glance

A radius of 10.90 Earth radii
A mass of 82.64 Earth masses
Surface gravity around 0.70 g
An orbital period of 108.453 days
Semi-major axis 0.4740 AU
Distance from Earth 85.40 light-years
Earth Similarity Index 0.289
Travel time at Voyager 1 speed 1,506,116 years

2 siblings around HD 142

HD 142 A d 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 this	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	Gas Giant	12.40	3,464.65	10,159.643	—	2012

HD 142 A d Planet Profile

Physical Specs

Radius

10.90 R⊕

Radius (Jupiter)

0.971 R♃

Mass

82.64 M⊕

Mass (Jupiter)

0.260 M♃

Density

0.35 g/cm³

Surface Gravity

0.70 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.289

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1672of 1771

top 94.4%

This planet

10.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

XO-2 S b 10.90 R⊕ HD 16141 b 10.90 R⊕ OGLE-2018-BLG-0799L b 10.90 R⊕

Metric	Earth	HD 142 A d	Jupiter
Radius (R⊕)	1.00	10.90	11.21
Mass (M⊕)	1.00	82.64	317.83
Density (g/cm³)	5.51	0.35	1.33
Surface Gravity (g)	1.00	0.70	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	82.635 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 10.900 R⊕ · percentile 5 / cohort 1771

Mass 82.635 M⊕ · percentile 3 / cohort 1747

Orbital period 108.45 d · percentile 54 / cohort 1533

Distance 26.19 pc · percentile 6 / cohort 1759

ESI 0.289 · percentile 55 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

108.453 days

Semi-major axis

0.4740 AU

Eccentricity

0.130

Inclination

— °

Year Length

A year here lasts approximately 108.45 Earth days (29.7% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.4740 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.289

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Feng et al. 2022

Instrument

Multiple Instruments

Publication

2022-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2022 at Multiple Observatories (12 shown).

Kepler-138 e · Rocky Terrestrial HD 93351 b · Super-Earth GJ 1002 b · Rocky Terrestrial GJ 2030 b · Sub-Neptune GJ 3929 c · Sub-Neptune HD 217786 c · Sub-Neptune GJ 1002 c · Rocky Terrestrial HD 155918 b · Sub-Neptune HD 213519 b · Sub-Neptune HD 191939 g · Sub-Neptune GJ 514 b · Sub-Neptune HD 12235 b · Sub-Neptune

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