Key parameters at a glance
- A radius of 12.70 Earth radii
- A mass of 2,256.58 Earth masses
- Surface gravity around 13.99 g
- An orbital period of 351.434 days
- Semi-major axis 1.0390 AU
- Distance from Earth 85.40 light-years
- Earth Similarity Index 0.431
- Travel time at Voyager 1 speed 1,506,116 years
Context from the literature
HD 142 b is a jovian exoplanet approximately 85.5 light years away in the constellation of Phoenix. This planet was discovered in 2001 by the Anglo-Australian Planet Search team.
Excerpted from Wikipedia · full article
2 siblings around HD 142
HD 142 b 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 this | 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 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1130of 1771
top 63.7%
This planet
12.70R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 142 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.70 | 11.21 |
| Mass (M⊕) | 1.00 | 2,256.58 | 317.83 |
| Density (g/cm³) | 5.51 | 6.05 | 1.33 |
| Surface Gravity (g) | 1.00 | 13.99 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 2,256.582 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 396.968 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
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
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 351.43 Earth days (96.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 1.0390 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.431
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
Tinney et al. 2002Instrument
UCLES Spectrograph
Publication
2002-05
Observation locale
Ground
Discovery cohort
Planets confirmed in 2001 at Anglo-Australian Telescope (2 shown).
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]
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
1
RV measurements
2
Archive notes
5
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