Key parameters at a glance
- A radius of 11.66 Earth radii
- A mass of 1,875.20 Earth masses
- Surface gravity around 13.80 g
- An orbital period of 3.356 days
- Semi-major axis 0.0427 AU
- Equilibrium temperature 1,120 K (847 °C)
- Distance from Earth 948.94 light-years
- Earth Similarity Index 0.153
- Travel time at Voyager 1 speed 16,734,518 years
- Almost certainly tidally locked to its host star given the close orbit
WASP-89 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1571of 1771
top 88.7%
This planet
11.66R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-89 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.66 | 11.21 |
| Mass (M⊕) | 1.00 | 1,875.20 | 317.83 |
| Density (g/cm³) | 5.51 | 7.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 13.80 | 2.53 |
| Insolation (S⊕) | 1.00 | 278.85 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,875.197 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 77202722
Gaia DR2
Gaia DR2 6857756246957592320
Gaia DR3
Gaia DR3 6857756246957592320
System
WASP-89
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.36 Earth days (0.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0427 AU.
Transit Fingerprint
Depth
1.490 %
Duration
2.460 h
Impact parameter b
0.100
Rp / R★
0.122100
Transit midpoint (BJD)
2,456,207.0211
Photometric dip
Transit produces a flux drop of 14,900 ppm lasting ≈ 2.46 h.
Extended Orbital Architecture
Planet / star radius ratio
0.122100
Semi-major axis / stellar radius
10.510
Impact parameter (b)
0.100
RV semi-amplitude (K)
848.000 m/s
Transit mid-time (BJD)
2,456,207.0211
Long. of periastron (ω)
28.00°
Angular separation (arcsec)
0.14700
Eq. Temperature
1,120K
(847 °C)
Insolation (S⊕)
278.85
Earth = 1.00
Earth Similarity (ESI)
0.153
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. 2015Instrument
iKon-L CCD Camera
Publication
2015-07
Observation locale
Ground
Discovery cohort
Planets confirmed in 2015 at SuperWASP (5 shown).
Host System: WASP-89
Spectral Class
K-type orange
Effective Temperature
5,130 K — cooler than the Sun (5,778 K)
Estimated Age
1.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.880 R☉
Stellar Mass
0.920 M☉
Metallicity [Fe/H]
0.15
Extended Stellar Properties
Surface gravity (log g)
4.515 dex
Stellar density
1.920 g/cm³
Systemic radial velocity
21.09 km/s
Rotational v·sin i
2.50 km/s
Rotation period
20.20 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
3.409 mas
Total Proper Motion
67.745 mas/yr
PM Right Ascension
15.43 mas/yr
PM Declination
-65.96 mas/yr
Galactic Cartesian (pc)
x = 0.656 · y = -0.681 · z = -0.325
Equatorial (J2000)
RA 313.90003° · Dec -18.97141°
Galactic ℓ, b
28.206° · -35.607°
Ecliptic λ, β
310.990° · -1.560°
HTM-20 index
-1373291801
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