Key parameters at a glance
- A radius of 2.04 Earth radii
- A mass of 6.26 Earth masses
- Surface gravity around 1.50 g
- An orbital period of 6.001 days
- Semi-major axis 0.0571 AU
- Equilibrium temperature 790 K (517 °C)
- Distance from Earth 145.22 light-years
- Earth Similarity Index 0.337
- Travel time at Voyager 1 speed 2,561,029 years
- Almost certainly tidally locked to its host star given the close orbit
Wolf 503 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1903of 1978
top 96.2%
This planet
2.04R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Wolf 503 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.04 | 11.21 |
| Mass (M⊕) | 1.00 | 6.26 | 317.83 |
| Density (g/cm³) | 5.51 | 2.92 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.50 | 2.53 |
| Insolation (S⊕) | 1.00 | 69.60 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 6.260 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HIP
HIP 67285
TIC
TIC 187278212
Gaia DR2
Gaia DR2 3620325206217720320
Gaia DR3
Gaia DR3 3620325206217720320
System
Wolf 503
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.00 Earth days (1.6% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0571 AU.
Transit Fingerprint
Depth
0.074 %
Duration
1.330 h
Impact parameter b
0.650
Rp / R★
0.027910
Transit midpoint (BJD)
2,458,191.3614
Photometric dip
Transit produces a flux drop of 744 ppm lasting ≈ 1.33 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027910
Impact parameter (b)
0.650
RV semi-amplitude (K)
2.980 m/s
Transit mid-time (BJD)
2,458,191.3614
Long. of periastron (ω)
112.00°
Angular separation (arcsec)
1.28000
Eq. Temperature
790K
(517 °C)
Insolation (S⊕)
69.60
Earth = 1.00
Earth Similarity (ESI)
0.337
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Peterson et al. 2018Instrument
Kepler CCD Array
Publication
2018-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: Wolf 503
Spectral Class
K-type orange
Effective Temperature
4,716 K — cooler than the Sun (5,778 K)
Estimated Age
11.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.689 R☉
Stellar Mass
0.688 M☉
Metallicity [Fe/H]
-0.47
Extended Stellar Properties
Surface gravity (log g)
4.620 dex
Stellar density
2.170 g/cm³
Systemic radial velocity
-46.83 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 9 bands
Astrometric Data
Parallax
22.430 mas
Total Proper Motion
667.845 mas/yr
PM Right Ascension
-342.83 mas/yr
PM Declination
-573.13 mas/yr
Galactic Cartesian (pc)
x = -0.887 · y = -0.449 · z = -0.107
Equatorial (J2000)
RA 206.84620° · Dec -6.13934°
Galactic ℓ, b
327.116° · 54.084°
Ecliptic λ, β
207.124° · 4.616°
HTM-20 index
1390946190
Similar Worlds
Kepler-845 b
Sub-Neptune · K-type orange
Radius 2.04 R⊕ · 1,405.9 ly
Kepler-48 d
Sub-Neptune · K-type orange
Radius 2.04 R⊕ · 1,000.4 ly
Kepler-324 e
Sub-Neptune · K-type orange
Radius 2.04 R⊕ · 1,635.9 ly
TOI-712 b
Sub-Neptune · K-type orange
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Kepler-161 c
Sub-Neptune · K-type orange
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K2-321 b
Sub-Neptune · K-type orange
Radius 2.05 R⊕ · 253.4 ly