Key parameters at a glance
- A radius of 12.50 Earth radii
- A mass of 3,177.65 Earth masses
- Surface gravity around 20.34 g
- An orbital period of 28,982.418 days
- Semi-major axis 17.5300 AU
- Distance from Earth 73.46 light-years
- Earth Similarity Index 0.384
- Travel time at Voyager 1 speed 1,295,544 years
1 sibling around HD 18143
HD 18143 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| HD 18143 b | Sub-Neptune | 3.28 | 10.81 | 10.285 | — | 2022 |
| HD 18143 c this | Gas Giant | 12.50 | 3,177.65 | 28,982.418 | — | 2022 |
HD 18143 c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1235of 1771
top 69.7%
This planet
12.50R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 18143 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.50 | 11.21 |
| Mass (M⊕) | 1.00 | 3,177.65 | 317.83 |
| Density (g/cm³) | 5.51 | 8.94 | 1.33 |
| Surface Gravity (g) | 1.00 | 20.34 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 3,177.648 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 18143
HIP
HIP 13642 A
TIC
TIC 436933294
Gaia DR2
Gaia DR2 116037204451525376
Gaia DR3
Gaia DR3 116037204451525376
System
HIP 13642 A
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 79.35 Earth years on a mildly elliptical path at a mean orbital distance of 17.5300 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.384
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Feng et al. 2022Instrument
Multiple Instruments
Publication
2022-09
Observation locale
Ground
Discovery cohort
Planets confirmed in 2022 at Multiple Observatories (12 shown).
Host System: HD 18143
Spectral Class
K-type orange
Effective Temperature
5,078 K — cooler than the Sun (5,778 K)
Estimated Age
9.40 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.870 R☉
Stellar Mass
0.850 M☉
Metallicity [Fe/H]
0.28
Extended Stellar Properties
Surface gravity (log g)
4.510 dex
Stellar density
1.675 g/cm³
Systemic radial velocity
32.50 km/s
Rotational v·sin i
0.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 7 bands
Astrometric Data
Parallax
44.368 mas
Total Proper Motion
327.655 mas/yr
PM Right Ascension
264.47 mas/yr
PM Declination
-193.43 mas/yr
Galactic Cartesian (pc)
x = 0.643 · y = 0.619 · z = 0.452
Equatorial (J2000)
RA 43.91402° · Dec 26.87238°
Galactic ℓ, b
154.438° · -28.294°
Ecliptic λ, β
49.309° · 9.707°
HTM-20 index
69215439
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