Qatar-4

Short description: Star in the constellation Andromeda

Qatar-4  Observation data
Equinox J2000.0]] (ICRS)

Constellation | Andromeda
Right ascension |  00h 19m 26.22s[1]
Declination | +44° 01′ 39.48″[1]
Apparent magnitude (V) | 13.60[2]
Characteristics
Evolutionary stage | main sequence star
Spectral type | K1V
Variable type | planetary transit
Astrometry
Proper motion (μ)|  RA: 0.985±0.031[1] mas/yr
Dec.: −8.866±0.017[1] mas/yr
Parallax (π)| 3.0105 ± 0.0263[1] mas
Distance| 1,083 ± 9 ly
(332 ± 3 pc)
Details
Mass| 0.856+0.029−0.030[3] M☉
Radius| 0.800+0.015−0.014[3] R☉
Luminosity| 0.481[2] L☉
Surface gravity (log g)| 4.565+0.018−0.020[3] cgs
Temperature| 5174+33−35[3] K
Metallicity [Fe/H]| 0.095+0.076−0.088[3] dex
Rotational velocity (v sin i)| 7.1±0.5[2] km/s
Age| 170±0.1[2] Myr
Other designations

Gaia DR2 385697172809355392, Qatar 4, UCAC3 269-3518

Database references
SIMBAD| data
Exoplanet Archive| data
Extrasolar Planets
Encyclopaedia| data

Qatar-4 is a faint K-dwarf star that hosts a planet in the constellation Andromeda. With an apparent magnitude of 13.60, it is impossible to detect with the naked eye, but can be detected with a powerful telescope. Qatar-4 is currently located 1,083 light years away based on parallax.

## Contents

* 1 Properties
* 2 Planetary system
* 3 Qatar-4b
* 4 See also
* 5 References

## Properties

This star is a relatively young star with an age of only 170 million years. At this age, it is still on the main sequence. Qatar-4 has 89.6% the mass of the Sun, and 84.9% the latter's radius. Despite all of this, it only has 48.1% of the Sun's luminosity, which corresponds to an effective temperature of 5,120 K. Qatar-4 has a similar metallicity to the Sun, and rotates at a rate of 7.1 km/s.

## Planetary system

In 2016, the Qatar Exoplanet Survey discovered a planet around this star.

The Qatar-4 planetary system[3] Companion
(in order from star) | Mass | Semimajor axis
(AU) | Orbital period
(days) | Eccentricity | Inclination | Radius

|
|
|
|
|
|

b | 5.26+0.22−0.21 MJ | 0.02861  | 1.80536494±9−7 | 0.046+0.064−0.034 | 87.5±1.6° | 1.083+0.022−0.021 RJ
Qatar-4bDiscovery[2]

Discovered by| Alsubai et al. 2019

Detection method

| Transit
Orbital characteristics

Semi-major axis

| 0.02803 ± 0.00048 au[2]
Eccentricity| 0[2]
Orbital period| 1.8053564 d[2]
Inclination| 87.5 ± 1.6°[2]
Semi-amplitude| 957±16 m/s[2]
Physical characteristics
Mean radius| 1.135 ± 0.11 RJ[2]
Mass| 5.36 ± 0.20 MJ[2]
Mean density| 4.50 ± 1.00 g cm−3[2]
Physics| 1385 ± 50 K[2]

## Qatar-4b

Qatar-4b is a Super-Jupiter orbiting the star Qatar-4 every 1.8 days. It was discovered in 2016 by the Qatar Exoplanet Survey (QES).

This planet has a very short orbit, with only 1.8 days for it to complete an orbit around Qatar-4. The period corresponds with a separation of around 0.03 astronomical unit|AU, which is almost 20 times closer than Mercury is to the Sun. Despite that, it has a perfectly round orbit. Since the host is an active star, Qatar-4 may be destroyed by tidal waves from the star.[4]

Qatar-4b has over 5 times the mass of Jupiter. Despite this, it has a radius that is only 13.5% larger than the latter's. This planet has an effective temperature of 1,385 K, which classifies as a hot Jupiter, and is denser than Jupiter, with about 4 times the density.

## See also

* Qatar-1
* Qatar-2
* Qatar-3
* Qatar-5

## References

1. ↑ 1.0 1.1 1.2 1.3 Gaia Collaboration (2018-04-01). "VizieR Online Data Catalog: Gaia DR2 (Gaia Collaboration, 2018)". VizieR Online Data Catalog 1345. Bibcode: 2018yCat.1345....0G.
2. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 Alsubai, Khalid; Mislis, Dimitris; Tsvetanov, Zlatan I.; Latham, David W.; Bieryla, Allyson; Buchhave, Lars A.; Esquerdo, Gilbert A.; Bramich, D. M. et al. (2017-04-01). "Qatar Exoplanet Survey : Qatar-3b, Qatar-4b, and Qatar-5b". The Astronomical Journal 153 (4): 200. doi:10.3847/1538-3881/aa6340. ISSN 0004-6256. Bibcode: 2017AJ....153..200A. http://eprints.keele.ac.uk/3544/1/2017AJ....153..200A.pdf.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Wang, Xian-Yu; Wang, Yong-Hao; Wang, Songhu; Wu, Zhen-Yu; Rice, Malena; Zhou, Xu; Hinse, Tobias C.; Liu, Hui-Gen et al. (2021), "Transiting Exoplanet Monitoring Project (TEMP). VI. The Homogeneous Refinement of System Parameters for 39 Transiting Hot Jupiters with 127 New Light Curves", The Astrophysical Journal Supplement Series 255 (1): 15, doi:10.3847/1538-4365/ac0835, Bibcode: 2021ApJS..255...15W
4. ↑ Hamer, Jacob H.; Schlaufman, Kevin C. (2019-11-01). "Hot Jupiters Are Destroyed by Tides While Their Host Stars Are on the Main Sequence". The Astronomical Journal 158 (5): 190. doi:10.3847/1538-3881/ab3c56. ISSN 0004-6256. Bibcode: 2019AJ....158..190H.

* v
* t
* e

Constellation of Andromeda

* Adhil
* Andromeda in Chinese astronomy
* List of Andromeda's satellite galaxies
* List of stars in Andromeda

Stars|

| Bayer|

* α
* β
* γ
* δ
* ε
* ζ
* η
* θ
* ι
* κ
* λ
* μ
* ν
* ξ
* ο
* π
* ρ
* σ
* τ
* υ
* φ
* χ
* ψ
* ω

|

Flamsteed|

* 2
* 3
* 4
* 5
* 6
* 7
* 8
* 9
* 10
* 11
* 12
* 13
* 14
* 15
* 18
* 22
* 23
* 26
* 28
* 32
* 36
* 39
* 41
* 44
* 45
* 47
* 49
* 51
* 55
* 56
* 58
* 59
* 60
* 62
* 63
* 64
* 65
* 66

Variable|

* R
* T
* U
* W
* Z
* RT
* RU
* RV
* RX
* SU
* SW
* TU
* TW
* WZ
* XZ
* AB
* AC
* AD
* AE
* AR
* BM
* BX
* CC
* CN
* DS
* DX
* EG
* ET
* EU
* FF
* GP
* GR
* GY
* HN
* KK
* KX
* KZ
* LL
* LP
* LQ
* OP
* OS
* OU
* PX
* QR
* QV
* QX
* V385
* V455
* V529

HD|

* 3
* 166
* 895
* 1185
* 1606
* 2421
* 2767
* 2942
* 3322
* 3346
* 4778
* 5608
* 5789/5788
* 6114
* 7853
* 8673
* 10307
* 13931
* 14622
* 15082
* 16004
* 16028
* 16175
* 217811
* 220105
* 221246
* 221776
* 222109
* 222399
* 223229
* 224365
* 224801
* 225218

Other|

* 3XMM J004232.1+411314
* 6 Persei
* ADS 48
* Groombridge 34
* HAT-P-6
* HR 178
* HR 8768
* M31-RV
* NGC 44
* NGC 82
* NGC 84
* NGC 91
* NGC 162
* NGC 464
* PA-99-N2
* Ross 248
* WASP-1
* WISE 0146+4234
* WISE J0005+3737
* WISE J004945.61+215120.0

| Exoplanets|

* 14 Andromedae b
* Upsilon Andromedae b
* c
* d
* e
* Gliese 15 Ab
* HD 13931 b
* HD 16175 b
* HAT-P-6b
* HAT-P-32b
* WASP-1b
* WASP-33b

|

| Star clusters|

* Mayall II
* NGC 206
* NGC 272
* NGC 752
* NGC 956
* NGC 7686

|

| Nebulae|

* NGC 7662

|

Galaxies|

| NGC|

* 5
* 11
* 13
* 19
* 21
* 20
* 27
* 39
* 43
* 48
* 49
* 51
* 67
* 68
* 69
* 70
* 71
* 72
* 74
* 76
* 79
* 80
* 81
* 83
* 85
* 86
* 90
* 93
* 94
* 96
* 97
* 108
* 109
* 112
* 140
* 149
* 160
* 169
* 181
* 183
* 184
* 214
* 218
* 226
* 228
* 229
* 233
* 243
* 252
* 258
* 260
* 262
* 280
* 304
* 317
* 389
* 393
* 404
* 425
* 431
* 477
* 478
* 512
* 513
* 523
* 528
* 536
* 668
* 679
* 687
* 700
* 703
* 704
* 705
* 708
* 709
* 710
* 712
* 714
* 717
* 732
* 753
* 759
* 891
* 1000
* 7640
* 7836

|

Numbered|

* I
* II
* III
* IV
* V
* VIII
* IX
* X
* XI
* XVIII
* XIX
* XXI

Other|

* 3C 66A
* 3C 66B
* Andromeda Galaxy
* Donatiello I
* Messier 32
* Messier 110

| Galaxy clusters|

* Abell 262
* NGC 68 group

|

| Astronomical events|

* GRB 101225A
* SN 1885A

|

Category

* v
* t
* e

2016 in space

* « 2015

2017 »

Spacecraft launches|

* ExoMars Trace Gas Orbiter (Mars orbiter) / Schiaparelli EDM (Mars lander)
* Hitomi (X-ray observatory)
* OSIRIS-REx (mission to asteroid)

Selected NEOs|

* Asteroid close approaches
* 2013 TX68
* 252P/LINEAR
* 2016 EU85
* 469219 Kamoʻoalewa
* 2016 PQ
* P/2016 BA14

Planets|

| Extrasolar |

* HD 19467 b
* 2MASS J2126–8140
* BD+20 594b
* Pr0211 c
* TRAPPIST-1b
* TRAPPIST-1c
* TRAPPIST-1d
* KELT-9b
* Kepler-1229b
* Kepler-1520b
* Kepler-1638b
* Kepler-1647b
* Kepler-20g
* V830 Tauri b
* Qatar-3b
* Qatar-4b
* Qatar-5b
* K2-33b
* HIP 41378 b
* HIP 41378 c
* HIP 41378 d
* HIP 41378 e
* HIP 41378 f
* HD 131399 Ab
* HD 164922 c
* KELT-11b
* K2-72b
* K2-72c
* K2-72d
* K2-72e
* Proxima Centauri b
* 38 Virginis b
* TW Hydrae b
* OGLE-2007-BLG-349(AB)b
* Gliese 536 b

|

Solar|

* Planet Nine (hypothesized)

Rogue|

* 2MASS J1119–1137

Discoveries|

* BOSS Great Wall
* Crater 2
* GW150914 (first observation of gravitational waves, discovered in 2015)
* GW151226 (discovered in 2015)
* GN-z11
* GRB 160625B
* (471325) 2011 KT19
* Virgo I
* 1994 WR12 (recovered)

Comets|

* P/2016 BA14
* C/2016 R2 (PANSTARRS)

Space exploration|

* Juno (entered Jupiter orbit)
* Rosetta / Philae (end of mission to comet 67P)

* Category:2015 in space — Category:2016 in space — Category:2017 in space

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