Key parameters at a glance
- A radius of 8.63 Earth radii
- A mass of 73.10 Earth masses
- Surface gravity around 0.98 g
- An orbital period of 3.923 days
- Semi-major axis 0.0457 AU
- Equilibrium temperature 970 K (697 °C)
- Distance from Earth 285.70 light-years
- Earth Similarity Index 0.158
- Travel time at Voyager 1 speed 5,038,272 years
- Almost certainly tidally locked to its host star given the close orbit
WASP-29 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#111of 574
top 19.2%
This planet
8.63R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | WASP-29 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 8.63 | 11.21 |
| Mass (M⊕) | 1.00 | 73.10 | 317.83 |
| Density (g/cm³) | 5.51 | 0.65 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.98 | 2.53 |
| Insolation (S⊕) | 1.00 | 121.77 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 73.101 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 183537452
Gaia DR2
Gaia DR2 6534414719318224512
Gaia DR3
Gaia DR3 6534414719318886144
System
WASP-29
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.92 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0457 AU.
Transit Fingerprint
Depth
1.000 %
Duration
2.649 h
Impact parameter b
0.140
Rp / R★
0.097300
Transit midpoint (BJD)
2,457,866.0761
Photometric dip
Transit produces a flux drop of 10,000 ppm lasting ≈ 2.65 h.
Extended Orbital Architecture
Planet / star radius ratio
0.097300
Semi-major axis / stellar radius
12.180
Impact parameter (b)
0.140
RV semi-amplitude (K)
35.600 m/s
Transit mid-time (BJD)
2,457,866.0761
Angular separation (arcsec)
0.52200
Eq. Temperature
970K
(697 °C)
Insolation (S⊕)
121.77
Earth = 1.00
Earth Similarity (ESI)
0.158
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
Hellier et al. 2010Instrument
iKon-L CCD Camera
Publication
2010-11
Observation locale
Ground
Discovery cohort
Planets confirmed in 2010 at SuperWASP (12 shown).
Host System: WASP-29
Spectral Class
K-type orange
Effective Temperature
4,800 K — cooler than the Sun (5,778 K)
Estimated Age
14.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.790 R☉
Stellar Mass
0.770 M☉
Metallicity [Fe/H]
0.11
Extended Stellar Properties
Surface gravity (log g)
4.500 dex
Stellar density
2.220 g/cm³
Systemic radial velocity
24.53 km/s
Rotational v·sin i
1.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
11.387 mas
Total Proper Motion
105.495 mas/yr
PM Right Ascension
-56.85 mas/yr
PM Declination
-88.86 mas/yr
Galactic Cartesian (pc)
x = 0.767 · y = -0.028 · z = -0.642
Equatorial (J2000)
RA 357.87920° · Dec -39.90712°
Galactic ℓ, b
343.320° · -72.181°
Ecliptic λ, β
339.849° · -35.262°
HTM-20 index
1487543115
Similar Worlds
TOI-2525 b
Neptune-like · K-type orange
Radius 8.68 R⊕ · 1,289.6 ly
Kepler-148 d
Neptune-like · K-type orange
Radius 8.68 R⊕ · 2,580.4 ly
HATS-49 b
Neptune-like · K-type orange
Radius 8.57 R⊕ · 1,058.1 ly
WASP-59 b
Neptune-like · K-type orange
Radius 8.69 R⊕ · 378.1 ly
HD 3765 b
Neptune-like · K-type orange
Radius 8.56 R⊕ · 58.5 ly
Kepler-16 b
Neptune-like · K-type orange
Radius 8.45 R⊕ · 244.9 ly