Key parameters at a glance
- A radius of 13.10 Earth radii
- A mass of 1,106.04 Earth masses
- Surface gravity around 6.45 g
- An orbital period of 512.535 days
- Semi-major axis 1.7710 AU
- Distance from Earth 201.39 light-years
- Earth Similarity Index 0.406
- Travel time at Voyager 1 speed 3,551,580 years
1 sibling around HD 203387
HD 203387 b 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 203387 b this | Gas Giant | 13.10 | 1,106.04 | 512.535 | — | 2022 |
| HD 203387 c | Gas Giant | 12.60 | 2,378.95 | 2,481.072 | — | 2022 |
HD 203387 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#910of 1771
top 51.3%
This planet
13.10R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 203387 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.10 | 11.21 |
| Mass (M⊕) | 1.00 | 1,106.04 | 317.83 |
| Density (g/cm³) | 5.51 | 2.70 | 1.33 |
| Surface Gravity (g) | 1.00 | 6.45 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 1,106.043 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 203387
TIC
TIC 288329878
Gaia DR2
Gaia DR2 6835905927255271424
Gaia DR3
Gaia DR3 6835905927256722688
System
HD 203387
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 1.40 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.7710 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.406
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 203387
Spectral Class
K-type orange
Effective Temperature
5,174 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
10.585 R☉
Stellar Mass
2.817 M☉
Metallicity [Fe/H]
0.05
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
16.177 mas
Total Proper Motion
31.063 mas/yr
PM Right Ascension
30.38 mas/yr
PM Declination
6.49 mas/yr
Galactic Cartesian (pc)
x = 0.739 · y = -0.608 · z = -0.290
Equatorial (J2000)
RA 320.56178° · Dec -16.83452°
Galactic ℓ, b
33.625° · -40.769°
Ecliptic λ, β
317.678° · -1.367°
HTM-20 index
-1733282788
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