Key parameters at a glance
- A radius of 9.53 Earth radii
- A mass of 139.85 Earth masses
- Surface gravity around 1.54 g
- An orbital period of 2.278 days
- Semi-major axis 0.0316 AU
- Equilibrium temperature 1,260 K (987 °C)
- Distance from Earth 1,159.53 light-years
- Earth Similarity Index 0.123
- Travel time at Voyager 1 speed 20,448,257 years
- Almost certainly tidally locked to its host star given the close orbit
WASP-144 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#42of 574
top 7.1%
This planet
9.53R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | WASP-144 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 9.53 | 11.21 |
| Mass (M⊕) | 1.00 | 139.85 | 317.83 |
| Density (g/cm³) | 5.51 | 0.95 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.54 | 2.53 |
| Insolation (S⊕) | 1.00 | 775.88 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 139.845 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 207077681
Gaia DR2
Gaia DR2 6582435924022652672
Gaia DR3
Gaia DR3 6582435924022652672
System
WASP-144
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.28 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0316 AU.
Transit Fingerprint
Depth
1.165 %
Duration
1.954 h
Impact parameter b
0.450
Rp / R★
0.107900
Transit midpoint (BJD)
2,457,157.2749
Photometric dip
Transit produces a flux drop of 11,650 ppm lasting ≈ 1.95 h.
Extended Orbital Architecture
Planet / star radius ratio
0.107900
Semi-major axis / stellar radius
8.390
Impact parameter (b)
0.450
RV semi-amplitude (K)
78.000 m/s
Transit mid-time (BJD)
2,457,157.2749
Angular separation (arcsec)
0.08890
Eq. Temperature
1,260K
(987 °C)
Insolation (S⊕)
775.88
Earth = 1.00
Earth Similarity (ESI)
0.123
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. 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
Hellier et al. 2019Instrument
iKon-L CCD Camera
Publication
2019-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 2018 at SuperWASP-South (12 shown).
Host System: WASP-144
Spectral Class
K-type orange
Effective Temperature
5,200 K — cooler than the Sun (5,778 K)
Estimated Age
8.71 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.810 R☉
Stellar Mass
0.810 M☉
Metallicity [Fe/H]
0.18
Extended Stellar Properties
Surface gravity (log g)
4.530 dex
Stellar density
2.170 g/cm³
Systemic radial velocity
16.11 km/s
Rotational v·sin i
1.90 km/s
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.788 mas
Total Proper Motion
39.991 mas/yr
PM Right Ascension
-3.34 mas/yr
PM Declination
-39.85 mas/yr
Galactic Cartesian (pc)
x = 0.593 · y = -0.484 · z = -0.643
Equatorial (J2000)
RA 320.76288° · Dec -40.04844°
Galactic ℓ, b
2.262° · -45.392°
Ecliptic λ, β
310.253° · -23.437°
HTM-20 index
539233191
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