| Observation data EpochJ2000.0 EquinoxJ2000.0 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 56m 36.48312s[1] |
| Declination | 36° 12′ 46.7739″[1] |
| Apparent magnitude (V) | 12.88[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | G0V[2] |
| Variable type | planetary transit |
| Astrometry | |
| Radial velocity (Rv) | 10.99±3.31[1] km/s |
| Proper motion (μ) | RA: −17.763[1]mas/yr Dec.: −8.484[1]mas/yr |
| Parallax (π) | 1.3316±0.0588 mas[1] |
| Distance | 2,400 ± 100 ly (750 ± 30 pc) |
| Absolute magnitude (MV) | 3.50 |
| Details[2] | |
| Mass | 1.145±0.064 M☉ |
| Radius | 1.272±0.14 R☉ |
| Luminosity | 1.90±0.46 L☉ |
| Surface gravity (log g) | 4.28±0.05 cgs |
| Temperature | 5,991±64 K |
| Metallicity [Fe/H] | −0.041±0.081 dex |
| Rotation | 6.31 |
| Rotational velocity (v sin i) | 10.4±0.5 km/s |
| Age | 310±1 Myr |
| Other designations | |
| Gaia DR2 2878641361300809856[3] | |
| Database references | |
Qatar-3 is a 12th magnitude star located in the northern constellationAndromeda. It is host to atransiting planet.[2] With a radial velocity of 10.99 km/s, it is drifting away from theSolar System, and is currently located 2,400 light years away based on itsannual parallax.
This star is a hotyellow dwarf with 14.5% more mass than theSun, and 27.2% larger. It has a luminosity of almost two times that of the Sun, and has effective temperature of 5,991 K, which gives it a yellow hue. Qatar-3 is also a metal poor star that has a similarmetallicity to the Sun, and has a rapid rotation rate of 10.4 km/s. This means it takes Qatar-3 6.31 days to complete a full rotation, while the Sun takes almost a month to rotate.
In 2016, theQatar Exoplanet Survey discovered a planet around Qatar-3,Qatar-4, andQatar-5, which was led by an international team in Qatar. Qatar-3b is a massive planet, with 4.31 times the mass ofJupiter, and has a similar radius to the latter. With a density of4.0 g/cm3, this is one of the densest planets discovered. With an effective temperature of1,681 K, it is a scorching planet.[4]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 4.31 ± 0.47 MJ | 0.03783 ± 0.00069 | 2.5079204 | 0 | 86.8 ± 2.0° | 1.096 ± 0.14 RJ |
| Discovery[5] | |
|---|---|
| Discovered by | Alsubai et al. 2019 |
| Discovery date | 2016 |
| Transit | |
| Orbital characteristics | |
| 0.03783 ± 0.00069 au[5] | |
| Eccentricity | 0[5] |
| 2.5079204 d[5] | |
| Inclination | 86.8 ± 2.0°[5] |
| Semi-amplitude | 587 ± 58 m/s[5] |
| Physical characteristics | |
| 1.096 ± 0.14 RJ[5] | |
| Mass | 4.31 ± 0.47 MJ[5] |
Meandensity | 4.0 ± 1.2 g cm−3[5] |
| Temperature | 1681 ± 84 K[5] |
Qatar-3b is ahot Jupiter.[6] It orbits its star every 2.5 days. It was discovered in 2016 by theQatar Exoplanet Survey (QES).[7][5] This planet was discovered by QES along withQatar-4b andQatar-5b. The light curves of the planet's respective host stars have been observed as well during the survey, along with their stellar properties.[8][5]
This planet is another typicalhot Jupiter. It orbits very close to its star with a period of 2 days, 12 hours, 11 minutes, and 24 seconds.[9] This corresponds with an orbital distance of about 0.04AU, which is 10 times closer to its star thanMercury is to theSun. With an eccentricity of 0, this suggests that Qatar-3b is on a perfectly circular orbit.
Qatar-3b is a massive planet, with 4.31 times the mass ofJupiter, but a similar radius. With a density of 4.0 g cm−3, this is one of the densest planets discovered. With an effective temperature of 1,681 K, it is a scorched planet.[5]
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