Key parameters at a glance
- A radius of 10.76 Earth radii
- A mass of 572.09 Earth masses
- Surface gravity around 4.94 g
- An orbital period of 7.873 days
- Semi-major axis 0.0750 AU
- Equilibrium temperature 900 K (627 °C)
- Distance from Earth 552.09 light-years
- Earth Similarity Index 0.197
- Travel time at Voyager 1 speed 9,736,120 years
- Almost certainly tidally locked to its host star given the close orbit
WASP-105 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1694of 1771
top 95.6%
This planet
10.76R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | WASP-105 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.76 | 11.21 |
| Mass (M⊕) | 1.00 | 572.09 | 317.83 |
| Density (g/cm³) | 5.51 | 2.65 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.94 | 2.53 |
| Insolation (S⊕) | 1.00 | 166.54 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 572.094 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 158623531
Gaia DR2
Gaia DR2 4917441922731087488
Gaia DR3
Gaia DR3 4917441922731087488
System
WASP-105
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.87 Earth days (2.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0750 AU.
Transit Fingerprint
Depth
1.200 %
Duration
3.720 h
Impact parameter b
0.100
Rp / R★
0.109540
Transit midpoint (BJD)
2,456,600.0765
Photometric dip
Transit produces a flux drop of 12,000 ppm lasting ≈ 3.72 h.
Extended Orbital Architecture
Planet / star radius ratio
0.109540
Semi-major axis / stellar radius
17.900
Impact parameter (b)
0.100
RV semi-amplitude (K)
194.000 m/s
Transit mid-time (BJD)
2,456,600.0765
Angular separation (arcsec)
0.44300
Eq. Temperature
900K
(627 °C)
Insolation (S⊕)
166.54
Earth = 1.00
Earth Similarity (ESI)
0.197
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
Anderson et al. 2017Instrument
iKon-L CCD Camera
Publication
2017-08
Observation locale
Ground
Discovery cohort
Planets confirmed in 2017 at SuperWASP-South (3 shown).
Host System: WASP-105
Spectral Class
K-type orange
Effective Temperature
5,070 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.900 R☉
Stellar Mass
0.890 M☉
Metallicity [Fe/H]
0.28
Extended Stellar Properties
Surface gravity (log g)
4.200 dex
Stellar density
1.730 g/cm³
Systemic radial velocity
24.68 km/s
Rotational v·sin i
1.70 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
3.960 mas
Total Proper Motion
47.514 mas/yr
PM Right Ascension
-35.37 mas/yr
PM Declination
-31.72 mas/yr
Galactic Cartesian (pc)
x = 0.578 · y = 0.260 · z = -0.773
Equatorial (J2000)
RA 24.16787° · Dec -50.65931°
Galactic ℓ, b
285.863° · -64.944°
Ecliptic λ, β
353.143° · -54.371°
HTM-20 index
725338090
Similar Worlds
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Gas Giant · K-type orange
Radius 10.76 R⊕ · 702.9 ly
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TOI-5616 b
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