Key parameters at a glance
- A radius of 13.70 Earth radii
- A mass of 400.46 Earth masses
- Surface gravity around 2.13 g
- An orbital period of 330.000 days
- Semi-major axis 1.0740 AU
- Distance from Earth 395.87 light-years
- Earth Similarity Index 0.327
- Travel time at Voyager 1 speed 6,981,200 years
2 siblings around HD 33142
HD 33142 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 33142 d | Neptune-like | 9.32 | 63.57 | 89.900 | — | 2022 |
| HD 33142 b this | Gas Giant | 13.70 | 400.46 | 330.000 | — | 2011 |
| HD 33142 c | Gas Giant | 13.90 | 282.87 | 810.200 | — | 2018 |
HD 33142 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#554of 1771
top 31.2%
This planet
13.70R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 33142 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.70 | 11.21 |
| Mass (M⊕) | 1.00 | 400.46 | 317.83 |
| Density (g/cm³) | 5.51 | 0.86 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.13 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 400.464 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 33142
HIP
HIP 23844
TIC
TIC 169397663
Gaia DR2
Gaia DR2 2986948238799721216
Gaia DR3
Gaia DR3 2986948238799721216
System
HD 33142
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 330.00 Earth days (90.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 1.0740 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.327
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Johnson et al. 2011Instrument
HIRES Spectrometer
Publication
2011-12
Observation locale
Ground
Discovery cohort
Planets confirmed in 2011 at W. M. Keck Observatory (12 shown).
Host System: HD 33142
Spectral Class
K-type orange
Effective Temperature
5,025 K — cooler than the Sun (5,778 K)
Estimated Age
2.72 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
4.170 R☉
Stellar Mass
1.520 M☉
Metallicity [Fe/H]
0.06
Extended Stellar Properties
Surface gravity (log g)
3.375 dex
Systemic radial velocity
33.78 km/s
Rotational v·sin i
2.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
8.210 mas
Total Proper Motion
34.476 mas/yr
PM Right Ascension
-7.51 mas/yr
PM Declination
33.65 mas/yr
Galactic Cartesian (pc)
x = 0.220 · y = 0.945 · z = -0.242
Equatorial (J2000)
RA 76.89806° · Dec -13.98634°
Galactic ℓ, b
214.337° · -29.226°
Ecliptic λ, β
74.072° · -36.704°
HTM-20 index
-545872135
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