Key parameters at a glance
- A radius of 14.06 Earth radii
- A mass of 792.64 Earth masses
- Surface gravity around 4.01 g
- An orbital period of 1.337 days
- Semi-major axis 0.0215 AU
- Equilibrium temperature 1,344 K (1071 °C)
- Distance from Earth 591.56 light-years
- Earth Similarity Index 0.110
- Travel time at Voyager 1 speed 10,432,199 years
- Almost certainly tidally locked to its host star given the close orbit
Qatar-2 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#405of 1771
top 22.8%
This planet
14.06R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | Qatar-2 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.06 | 11.21 |
| Mass (M⊕) | 1.00 | 792.64 | 317.83 |
| Density (g/cm³) | 5.51 | 1.57 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.01 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 792.635 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 2521105
Gaia DR2
Gaia DR2 3620030644476623616
Gaia DR3
Gaia DR3 3620030644476623616
System
Qatar-2
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.34 Earth days (0.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0215 AU.
Transit Fingerprint
Depth
3.334 %
Duration
1.810 h
Impact parameter b
0.115
Rp / R★
0.165900
Transit midpoint (BJD)
2,455,624.2671
Photometric dip
Transit produces a flux drop of 33,335 ppm lasting ≈ 1.81 h.
Extended Orbital Architecture
Planet / star radius ratio
0.165900
Semi-major axis / stellar radius
6.515
Impact parameter (b)
0.115
RV semi-amplitude (K)
558.700 m/s
Transit mid-time (BJD)
2,455,624.2671
Sky-projected obliquity (λ)
0.00°
Angular separation (arcsec)
0.11900
Eq. Temperature
1,344K
(1071 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.110
0 = alien, 1 = Earth-identical
Insufficient insolation data — 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
Bryan et al. 2011Instrument
FLI ProLine 4K CCD Sensor
Publication
2012-05
Observation locale
Ground
Host System: Qatar-2
Spectral Class
K-type orange
Effective Temperature
4,645 K — cooler than the Sun (5,778 K)
Estimated Age
5.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.776 R☉
Stellar Mass
0.743 M☉
Metallicity [Fe/H]
0.02
Extended Stellar Properties
Surface gravity (log g)
4.530 dex
Stellar density
2.241 g/cm³
Systemic radial velocity
-23.55 km/s
Rotational v·sin i
3.28 km/s
Rotation period
18.00 days
Metallicity ratio
[M/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
5.485 mas
Total Proper Motion
89.500 mas/yr
PM Right Ascension
-88.18 mas/yr
PM Declination
-15.29 mas/yr
Galactic Cartesian (pc)
x = -0.880 · y = -0.461 · z = -0.118
Equatorial (J2000)
RA 207.65549° · Dec -6.80407°
Galactic ℓ, b
327.956° · 53.168°
Ecliptic λ, β
208.115° · 4.280°
HTM-20 index
2086684344
Observation Record
RV measurements
1
Emission spectra
4
Archive notes
1
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