Key parameters at a glance
- A radius of 10.09 Earth radii
- A mass of 282.87 Earth masses
- Surface gravity around 2.78 g
- An orbital period of 1.769 days
- Semi-major axis 0.0261 AU
- Equilibrium temperature 1,200 K (927 °C)
- Distance from Earth 297.78 light-years
- Earth Similarity Index 0.138
- Travel time at Voyager 1 speed 5,251,300 years
- Almost certainly tidally locked to its host star given the close orbit
WASP-145 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1765of 1771
top 99.6%
This planet
10.09R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-145 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.09 | 11.21 |
| Mass (M⊕) | 1.00 | 282.87 | 317.83 |
| Density (g/cm³) | 5.51 | 1.60 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.78 | 2.53 |
| Insolation (S⊕) | 1.00 | 313.40 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 282.869 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 381856447
Gaia DR2
Gaia DR2 6458529931463278848
Gaia DR3
Gaia DR3 6458529931463278848
System
WASP-145
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.77 Earth days (0.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0261 AU.
Transit Fingerprint
Depth
1.160 %
Duration
0.977 h
Impact parameter b
0.970
Rp / R★
0.108000
Transit midpoint (BJD)
2,456,844.1653
Photometric dip
Transit produces a flux drop of 11,600 ppm lasting ≈ 0.98 h.
Extended Orbital Architecture
Planet / star radius ratio
0.108000
Semi-major axis / stellar radius
8.740
Impact parameter (b)
0.970
RV semi-amplitude (K)
178.000 m/s
Transit mid-time (BJD)
2,456,844.1653
Angular separation (arcsec)
0.28600
Eq. Temperature
1,200K
(927 °C)
Insolation (S⊕)
313.40
Earth = 1.00
Earth Similarity (ESI)
0.138
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-145 A
Spectral Class
K-type orange
Effective Temperature
4,900 K — cooler than the Sun (5,778 K)
Estimated Age
6.99 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.680 R☉
Stellar Mass
0.760 M☉
Metallicity [Fe/H]
-0.04
Extended Stellar Properties
Surface gravity (log g)
4.650 dex
Stellar density
3.360 g/cm³
Systemic radial velocity
3.35 km/s
Rotational v·sin i
2.10 km/s
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
10.924 mas
Total Proper Motion
107.689 mas/yr
PM Right Ascension
107.11 mas/yr
PM Declination
11.19 mas/yr
Galactic Cartesian (pc)
x = 0.409 · y = -0.317 · z = -0.856
Equatorial (J2000)
RA 322.25376° · Dec -58.83615°
Galactic ℓ, b
336.103° · -43.037°
Ecliptic λ, β
302.958° · -41.229°
HTM-20 index
1111696148
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