Key parameters at a glance
- A radius of 0.91 Earth radii
- A mass of 4.10 Earth masses
- Surface gravity around 4.95 g
- An orbital period of 10.641 days
- Semi-major axis 0.0952 AU
- Equilibrium temperature 968 K (695 °C)
- Distance from Earth 344.03 light-years
- Earth Similarity Index 0.255
- Travel time at Voyager 1 speed 6,066,957 years
2 siblings around HD 224018
HD 224018 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 224018 b this | Rocky Terrestrial | 0.91 | 4.10 | 10.641 | 968 | 2025 |
| HD 224018 c | Sub-Neptune | 2.42 | 10.40 | 36.577 | 641 | 2025 |
| HD 224018 d | Sub-Neptune | 2.40 | 4.20 | 138.073 | 411 | 2025 |
HD 224018 b Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#406of 570
top 71.1%
This planet
0.91R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | HD 224018 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 0.91 | 11.21 |
| Mass (M⊕) | 1.00 | 4.10 | 317.83 |
| Density (g/cm³) | 5.51 | 17.10 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.95 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4.100 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 224018
TIC
TIC 248608315
Gaia DR2
Gaia DR2 2446440348493043968
Gaia DR3
Gaia DR3 2446440348493043968
System
HD 224018
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 10.64 Earth days (2.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0952 AU.
Transit Fingerprint
Rp / R★
0.007300
Transit midpoint (BJD)
2,457,762.9800
Extended Orbital Architecture
Planet / star radius ratio
0.007300
RV semi-amplitude (K)
1.190 m/s
Transit mid-time (BJD)
2,457,762.9800
Long. of periastron (ω)
190.00°
Angular separation (arcsec)
0.90300
Eq. Temperature
968K
(695 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.255
0 = alien, 1 = Earth-identical
Insufficient insolation data — the surface is too hot to retain surface water.
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
Damasso et al. 2025Instrument
HARPS-N Spectrograph
Publication
2025-08
Observation locale
Ground
Discovery cohort
Planets confirmed in 2025 at Roque de los Muchachos Observatory (3 shown).
Host System: HD 224018
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,784 K — hotter than the Sun (5,778 K)
Estimated Age
7.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.147 R☉
Stellar Mass
1.013 M☉
Metallicity [Fe/H]
0.05
Extended Stellar Properties
Surface gravity (log g)
4.320 dex
Stellar density
0.902 g/cm³
Systemic radial velocity
-62.77 km/s
Rotational v·sin i
2.10 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
9.452 mas
Total Proper Motion
112.877 mas/yr
PM Right Ascension
-112.58 mas/yr
PM Declination
-8.19 mas/yr
Galactic Cartesian (pc)
x = 0.996 · y = -0.024 · z = -0.082
Equatorial (J2000)
RA 358.63901° · Dec -4.72334°
Galactic ℓ, b
89.242° · -63.810°
Ecliptic λ, β
356.867° · -3.792°
HTM-20 index
1167457204
Similar Worlds
Kepler-1992 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 0.91 R⊕ · 1,738.3 ly
Kepler-1525 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 0.91 R⊕ · 1,249.1 ly
Kepler-1296 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 0.91 R⊕ · 5,060.4 ly
Kepler-1934 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 0.91 R⊕ · 1,397.6 ly
Kepler-1365 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 0.92 R⊕ · 2,740.1 ly
Kepler-119 c
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 0.92 R⊕ · 2,289.6 ly