Key parameters at a glance
- A radius of 14.70 Earth radii
- A mass of 52.35 Earth masses
- Surface gravity around 0.24 g
- An orbital period of 4.178 days
- Semi-major axis 0.0484 AU
- Equilibrium temperature 1,400 K (1127 °C)
- Distance from Earth 520.24 light-years
- Earth Similarity Index 0.063
- Travel time at Voyager 1 speed 9,174,461 years
WASP-127 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#260of 1771
top 14.6%
This planet
14.70R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-127 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.70 | 11.21 |
| Mass (M⊕) | 1.00 | 52.35 | 317.83 |
| Density (g/cm³) | 5.51 | 0.10 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.24 | 2.53 |
| Insolation (S⊕) | 1.00 | 703.97 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 52.347 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 169226822
Gaia DR2
Gaia DR2 3778075717162985600
Gaia DR3
Gaia DR3 3778075717162985600
System
WASP-127
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.18 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0484 AU.
Transit Fingerprint
Depth
1.021 %
Duration
4.353 h
Impact parameter b
0.290
Rp / R★
0.101030
Transit midpoint (BJD)
2,456,776.6212
Photometric dip
Transit produces a flux drop of 10,210 ppm lasting ≈ 4.35 h.
Extended Orbital Architecture
Planet / star radius ratio
0.101030
Semi-major axis / stellar radius
7.810
Impact parameter (b)
0.290
RV semi-amplitude (K)
22.000 m/s
Transit mid-time (BJD)
2,456,776.6212
Angular separation (arcsec)
0.30300
Eq. Temperature
1,400K
(1127 °C)
Insolation (S⊕)
703.97
Earth = 1.00
Earth Similarity (ESI)
0.063
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Lam et al. 2017Instrument
iKon-L CCD Camera
Publication
2017-03
Observation locale
Ground
Discovery cohort
Planets confirmed in 2016 at SuperWASP (11 shown).
Host System: WASP-127
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,620 K — cooler than the Sun (5,778 K)
Estimated Age
11.41 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.333 R☉
Stellar Mass
0.950 M☉
Metallicity [Fe/H]
-0.19
Extended Stellar Properties
Surface gravity (log g)
4.180 dex
Stellar density
0.565 g/cm³
Systemic radial velocity
-8.25 km/s
Rotational v·sin i
0.30 km/s
Metallicity ratio
[M/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
6.241 mas
Total Proper Motion
25.680 mas/yr
PM Right Ascension
19.22 mas/yr
PM Declination
17.03 mas/yr
Galactic Cartesian (pc)
x = -0.941 · y = 0.332 · z = -0.067
Equatorial (J2000)
RA 160.55876° · Dec -3.83500°
Galactic ℓ, b
252.724° · 46.061°
Ecliptic λ, β
163.530° · -11.155°
HTM-20 index
-1612926122
Observation Record
Transmission spectra
6
Emission spectra
2
Archive notes
3
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