Key parameters at a glance
- A radius of 10.60 Earth radii
- A mass of 306.39 Earth masses
- Surface gravity around 2.72 g
- An orbital period of 3.126 days
- Semi-major axis 0.0396 AU
- Equilibrium temperature 1,153 K (880 °C)
- Distance from Earth 688.83 light-years
- Earth Similarity Index 0.139
- Travel time at Voyager 1 speed 12,147,489 years
- Almost certainly tidally locked to its host star given the close orbit
WASP-45 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1712of 1771
top 96.6%
This planet
10.60R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-45 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.60 | 11.21 |
| Mass (M⊕) | 1.00 | 306.39 | 317.83 |
| Density (g/cm³) | 5.51 | 1.42 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.72 | 2.53 |
| Insolation (S⊕) | 1.00 | 294.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 306.388 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 305.435 M⊕ | Lower bound from radial-velocity fitting. |
| Computed mass | 306.592 M⊕ | Model-computed mass (e.g. from mass-radius relation). |
Star Catalogue Identifiers
TIC
TIC 120610833
Gaia DR2
Gaia DR2 2308834780352875904
Gaia DR3
Gaia DR3 2308834780352875904
System
WASP-45
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.13 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0396 AU.
Transit Fingerprint
Depth
1.290 %
Duration
1.682 h
Impact parameter b
0.866
Rp / R★
0.113700
Transit midpoint (BJD)
2,458,339.1430
Photometric dip
Transit produces a flux drop of 12,900 ppm lasting ≈ 1.68 h.
Extended Orbital Architecture
Planet / star radius ratio
0.113700
Semi-major axis / stellar radius
9.970
Impact parameter (b)
0.866
RV semi-amplitude (K)
149.000 m/s
Transit mid-time (BJD)
2,458,339.1430
Angular separation (arcsec)
0.18800
Eq. Temperature
1,153K
(880 °C)
Insolation (S⊕)
294.00
Earth = 1.00
Earth Similarity (ESI)
0.139
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
Anderson et al. 2011Instrument
iKon-L CCD Camera
Publication
2012-05
Observation locale
Ground
Discovery cohort
Planets confirmed in 2011 at SuperWASP (8 shown).
Host System: WASP-45
Spectral Class
K-type orange
Effective Temperature
5,150 K — cooler than the Sun (5,778 K)
Estimated Age
12.70 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.855 R☉
Stellar Mass
0.850 M☉
Metallicity [Fe/H]
-0.03
Extended Stellar Properties
Surface gravity (log g)
4.503 dex
Stellar density
1.920 g/cm³
Systemic radial velocity
4.55 km/s
Rotational v·sin i
2.30 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.706 mas
Total Proper Motion
70.685 mas/yr
PM Right Ascension
52.90 mas/yr
PM Declination
-46.89 mas/yr
Galactic Cartesian (pc)
x = 0.806 · y = 0.074 · z = -0.588
Equatorial (J2000)
RA 5.23776° · Dec -35.99847°
Galactic ℓ, b
337.206° · -79.016°
Ecliptic λ, β
348.351° · -34.655°
HTM-20 index
-1537433228
Observation Record
RV measurements
1
Transmission spectra
3
Archive notes
2
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