Key parameters at a glance
- A radius of 11.90 Earth radii
- A mass of 212.31 Earth masses
- Surface gravity around 1.50 g
- An orbital period of 3.506 days
- Semi-major axis 0.0423 AU
- Equilibrium temperature 1,006 K (733 °C)
- Distance from Earth 328.92 light-years
- Earth Similarity Index 0.140
- Travel time at Voyager 1 speed 5,800,536 years
- Almost certainly tidally locked to its host star given the close orbit
Qatar-6 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1525of 1771
top 86.1%
This planet
11.90R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | Qatar-6 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.90 | 11.21 |
| Mass (M⊕) | 1.00 | 212.31 | 317.83 |
| Density (g/cm³) | 5.51 | 0.69 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.50 | 2.53 |
| Insolation (S⊕) | 1.00 | 174.90 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 212.310 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 311133118
Gaia DR2
Gaia DR2 1265513389372846848
Gaia DR3
Gaia DR3 1265513389372846848
System
Qatar-6
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.51 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0423 AU.
Transit Fingerprint
Depth
1.838 %
Duration
1.589 h
Impact parameter b
0.878
Rp / R★
0.151000
Transit midpoint (BJD)
2,457,784.0327
Photometric dip
Transit produces a flux drop of 18,379 ppm lasting ≈ 1.59 h.
Extended Orbital Architecture
Planet / star radius ratio
0.151000
Semi-major axis / stellar radius
12.610
Impact parameter (b)
0.878
RV semi-amplitude (K)
101.600 m/s
Transit mid-time (BJD)
2,457,784.0327
Long. of periastron (ω)
58.00°
Sky-projected obliquity (λ)
0.10°
True obliquity (ψ)
21.82°
Angular separation (arcsec)
0.41900
Eq. Temperature
1,006K
(733 °C)
Insolation (S⊕)
174.90
Earth = 1.00
Earth Similarity (ESI)
0.140
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
Alsubai et al. 2018Instrument
FLI ProLine 4K CCD Sensor
Publication
2018-02
Observation locale
Ground
Discovery cohort
Planets confirmed in 2017 at Qatar (3 shown).
Host System: Qatar-6
Spectral Class
K-type orange
Effective Temperature
5,052 K — cooler than the Sun (5,778 K)
Estimated Age
1.02 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.722 R☉
Stellar Mass
0.822 M☉
Metallicity [Fe/H]
-0.03
Extended Stellar Properties
Surface gravity (log g)
4.636 dex
Stellar density
3.080 g/cm³
Systemic radial velocity
-27.86 km/s
Rotational v·sin i
2.90 km/s
Rotation period
12.75 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
9.887 mas
Total Proper Motion
54.323 mas/yr
PM Right Ascension
-51.91 mas/yr
PM Declination
16.02 mas/yr
Galactic Cartesian (pc)
x = -0.686 · y = -0.622 · z = 0.377
Equatorial (J2000)
RA 222.21008° · Dec 22.15261°
Galactic ℓ, b
28.834° · 62.926°
Ecliptic λ, β
211.528° · 36.404°
HTM-20 index
-794415596
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