Key parameters at a glance
- A radius of 13.90 Earth radii
- A mass of 282.87 Earth masses
- Surface gravity around 1.46 g
- An orbital period of 810.200 days
- Semi-major axis 1.9550 AU
- Distance from Earth 395.87 light-years
- Earth Similarity Index 0.298
- Travel time at Voyager 1 speed 6,981,200 years
2 siblings around HD 33142
HD 33142 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 33142 d | Neptune-like | 9.32 | 63.57 | 89.900 | — | 2022 |
| HD 33142 b | Gas Giant | 13.70 | 400.46 | 330.000 | — | 2011 |
| HD 33142 c this | Gas Giant | 13.90 | 282.87 | 810.200 | — | 2018 |
HD 33142 c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#456of 1771
top 25.7%
This planet
13.90R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 33142 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.90 | 11.21 |
| Mass (M⊕) | 1.00 | 282.87 | 317.83 |
| Density (g/cm³) | 5.51 | 0.58 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.46 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 282.867 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 about 2.22 Earth years on a nearly circular orbit at a mean orbital distance of 1.9550 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.298
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Bryan et al. 2016Instrument
HIRES Spectrometer
Publication
2016-04
Observation locale
Ground
Discovery cohort
Planets confirmed in 2018 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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