Key parameters at a glance
- A radius of 12.90 Earth radii
- A mass of 1,433.41 Earth masses
- Surface gravity around 8.61 g
- An orbital period of 1,928.000 days
- Semi-major axis 2.9300 AU
- Distance from Earth 111.81 light-years
- Earth Similarity Index 0.424
- Travel time at Voyager 1 speed 1,971,715 years
Context from the literature
HD 142022 Ab is an exoplanet discovered by the radial velocity method by Eggenberger et al. in 2005, after finding that HD 142022 A is wobbling which indicated the presence of a massive planet, with a minimum mass 4.5 times Jupiter. It has a relatively wide separation between the planet and the star of nearly 3 AU, and takes 1928 days or 5.28 years to revolve. As is common for long-period planets, it has a relatively high eccentricity of 53±20%. In 2023, the inclination and true mass of HD 142022 Ab were determined via astrometry.
Excerpted from Wikipedia · full article
HD 142022 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1011of 1771
top 57.0%
This planet
12.90R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 142022 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.90 | 11.21 |
| Mass (M⊕) | 1.00 | 1,433.41 | 317.83 |
| Density (g/cm³) | 5.51 | 3.67 | 1.33 |
| Surface Gravity (g) | 1.00 | 8.61 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,433.406 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 1,411.165 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 142022 A
HIP
HIP 79242
TIC
TIC 290493086
Gaia DR2
Gaia DR2 5768159705804908800
Gaia DR3
Gaia DR3 5768159705804908800
System
HD 142022
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 5.28 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.9300 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.424
0 = alien, 1 = Earth-identical
Detection Signatures
Radial velocity
Stellar wobble has been measured spectroscopically.
Astrometry
Positional wobble of the host star was measured.
Discovery Paper
Primary reference
Eggenberger et al. 2006Instrument
CORALIE Spectrograph
Publication
2006-03
Observation locale
Ground
Discovery cohort
Planets confirmed in 2005 at La Silla Observatory (10 shown).
Host System: HD 142022 A
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,421 K — cooler than the Sun (5,778 K)
Estimated Age
7.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.040 R☉
Stellar Mass
0.900 M☉
Metallicity [Fe/H]
0.19
Extended Stellar Properties
Surface gravity (log g)
4.350 dex
Stellar density
1.218 g/cm³
Systemic radial velocity
-9.80 km/s
Rotational v·sin i
1.20 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
29.142 mas
Total Proper Motion
338.496 mas/yr
PM Right Ascension
-337.06 mas/yr
PM Declination
-31.20 mas/yr
Galactic Cartesian (pc)
x = -0.046 · y = -0.089 · z = -0.995
Equatorial (J2000)
RA 242.54817° · Dec -84.23175°
Galactic ℓ, b
307.719° · -23.316°
Ecliptic λ, β
264.455° · -61.325°
HTM-20 index
-1847580399
Observation Record
Photometric series
1
RV measurements
2
Archive notes
5
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