# Qatar-1

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Star in the constellation Draco

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Qatar-1 Observation data Epoch J2000 Equinox Constellation Draco Right ascension 20h 13m 31.6176s Declination 65° 09′ 43.4909″ Apparent magnitude (V) 12.84 Characteristics Evolutionary stage main sequence star Spectral type K3V B−V color index 1.06 V−R color index 0.19 J−H color index 0.472 J−K color index 0.590 Variable type planetary transit variable Astrometry Radial velocity (Rv) -37.835±0.063 km/s Proper motion (μ) RA: 12.636±0.048 mas/yr Dec.: 58.170±0.041 mas/yr Parallax (π) 5.3587±0.0231 mas Distance 609 ± 3 ly (186.6 ± 0.8 pc) Details[1][2] Mass 0.85±0.03 M☉ Radius 0.823±0.025 R☉ Surface gravity (log g) 4.536±0.024 cgs Temperature 4861±125 K Metallicity [Fe/H] 0.2±0.1 dex Rotational velocity (v sin i) 1.7±0.3 km/s Age 4.5 Gyr Other designations Qatar-1, 2MASS J20133160+6509433, Gaia DR2 2244830490514284928, V592 Dra[3] Database references SIMBAD data

**Qatar-1** is an orange [main sequence](/source/Main_sequence) [star](/source/Star) in the [constellation](/source/Constellation_(astronomy)) of [Draco](/source/Draco_(constellation)).

## Star characteristics

Qatar-1 has an average to high metallicity of 160% of solar,[1] and is of similar age to Sun.[2] The star has significant starspot activity.[4]

## Planetary system

The "[Hot Jupiter](/source/Hot_Jupiter)" class planet Qatar-1b was discovered by the [Qatar Exoplanet Survey](/source/Qatar_Exoplanet_Survey) in 2010.[1] The planetary orbit is likely aligned with the rotational axis of the star, with the misalignment measurement based on the [Rossiter-McLaughlin effect](/source/Rossiter-McLaughlin_effect) equal to −8.4±7.1 degrees.[2] The planet has a large measured temperature difference between dayside (1696±39 [K](/source/Kelvin)) and nightside (1098±158 [K](/source/Kelvin)).[5] A spectroscopic study in 2017 does suggest that Qatar-1b has relatively clear skies with a few clouds.[6]

Additional planets or a [brown dwarf](/source/Brown_dwarf) in the system were suspected in 2013,[7] but were refuted in 2015.[8][9]

The [transit-timing variation](/source/Transit-timing_variation) search in 2020 has also resulted in no detection of additional planets in the system,[10][11] although by 2022 additional [transit-timing variation](/source/Transit-timing_variation) data have suggested the planetary system is accelerating under influence of the unseen long-period companion.[12]

The Qatar-1 planetary system[1][2][10] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (days) Eccentricity Inclination (°) Radius b 1.33±0.05 MJ 0.02343±0.0012 1.4200236±0.0000001[11] 0.020+0.011 −0.01 84.23±0.06 1.19±0.09 RJ

## References

1. ^ [***a***](#cite_ref-Alsubai2010_1-0) [***b***](#cite_ref-Alsubai2010_1-1) [***c***](#cite_ref-Alsubai2010_1-2) [***d***](#cite_ref-Alsubai2010_1-3) Alsubai, K. A.; Parley, N. R.; Bramich, D. M.; West, R. G.; Sorensen, P. M.; Collier Cameron, A.; Latham, D. W.; Horne, K.; Anderson, D. R.; Bakos, G. Á.; Brown, D. J. A.; Buchhave, L. A.; Esquerdo, G. A.; Everett, M. E.; Fűrész, G.; Hartman, J. D.; Hellier, C.; Miller, G. M.; Pollacco, D.; Quinn, S. N.; Smith, J. C.; Stefanik, R. P.; Szentgyorgyi, A. (2011). ["Qatar-1b: A hot Jupiter orbiting a metal-rich K dwarf star"](https://doi.org/10.1111%2Fj.1365-2966.2011.19316.x). *Monthly Notices of the Royal Astronomical Society*. **417** (1): 709–716. [arXiv](/source/ArXiv_(identifier)):[1012.3027](https://arxiv.org/abs/1012.3027). [Bibcode](/source/Bibcode_(identifier)):[2011MNRAS.417..709A](https://ui.adsabs.harvard.edu/abs/2011MNRAS.417..709A). [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2011.19316.x](https://doi.org/10.1111%2Fj.1365-2966.2011.19316.x). [S2CID](/source/S2CID_(identifier)) [55675165](https://api.semanticscholar.org/CorpusID:55675165).

1. ^ [***a***](#cite_ref-Govino2013_2-0) [***b***](#cite_ref-Govino2013_2-1) [***c***](#cite_ref-Govino2013_2-2) [***d***](#cite_ref-Govino2013_2-3) Covino, E.; Esposito, M.; Barbieri, M.; Mancini, L.; Nascimbeni, V.; Claudi, R.; Desidera, S.; Gratton, R.; Lanza, A. F.; Sozzetti, A.; Biazzo, K.; Affer, L.; Gandolfi, D.; Munari, U.; Pagano, I.; Bonomo, A. S.; Collier Cameron, A.; Hébrard, G.; Maggio, A.; Messina, S.; Micela, G.; Molinari, E.; Pepe, F.; Piotto, G.; Ribas, I.; Santos, N. C.; Southworth, J.; Shkolnik, E.; Triaud, A. H. M. J.; et al. (2013). "The GAPS programme with HARPS-N at TNG". *Astronomy & Astrophysics*. **554**: A28. [arXiv](/source/ArXiv_(identifier)):[1304.0005](https://arxiv.org/abs/1304.0005). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201321298](https://doi.org/10.1051%2F0004-6361%2F201321298). [S2CID](/source/S2CID_(identifier)) [54793301](https://api.semanticscholar.org/CorpusID:54793301).

1. **[^](#cite_ref-Simbad_3-0)** [Qatar 1 -- High proper-motion Star](http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Qatar%201)

1. **[^](#cite_ref-4)** Mislis, D.; Mancini, L.; Tregloan-Reed, J.; Ciceri, S.; Southworth, J.; d'Ago, G.; Bruni, I.; Baştürk, Ö.; Alsubai, K. A.; Bachelet, E.; Bramich, D. M.; Henning, Th.; Hinse, T. C.; Iannella, A. L.; Parley, N.; Schroeder, T. (2015). ["High-precision multiband time series photometry of exoplanets Qatar-1b and TrES-5b"](https://doi.org/10.1093%2Fmnras%2Fstv197). *Monthly Notices of the Royal Astronomical Society*. **448** (3): 2617–2623. [arXiv](/source/ArXiv_(identifier)):[1503.02246](https://arxiv.org/abs/1503.02246). [Bibcode](/source/Bibcode_(identifier)):[2015MNRAS.448.2617M](https://ui.adsabs.harvard.edu/abs/2015MNRAS.448.2617M). [doi](/source/Doi_(identifier)):[10.1093/mnras/stv197](https://doi.org/10.1093%2Fmnras%2Fstv197). [S2CID](/source/S2CID_(identifier)) [53561305](https://api.semanticscholar.org/CorpusID:53561305).

1. **[^](#cite_ref-5)** May, Erin; Stevenson, Kevin; Bean, Jacob; Bell, Taylor; Cowan, Nicolas; Dang, Lisa; Desert, Jean-Michel; Fortney, Jonathan; Keating, Dylan; Kempton, Eliza; Komacek, Thaddeus; Lewis, Nikole; Mansfield, Megan; Morley, Caroline; Parmentier, Vivien; Rauscher, Emily; Swain, Mark; Zellem, Robert; Showman, Adam (2022), "A New Analysis of Eight Spitzer Phase Curves and Hot Jupiter Population Trends: Qatar-1b, Qatar-2b, WASP-52b, WASP-34b, and WASP-140b", *The Astronomical Journal*, **163** (6): 256, [arXiv](/source/ArXiv_(identifier)):[2203.15059](https://arxiv.org/abs/2203.15059), [Bibcode](/source/Bibcode_(identifier)):[2022AJ....163..256M](https://ui.adsabs.harvard.edu/abs/2022AJ....163..256M), [doi](/source/Doi_(identifier)):[10.3847/1538-3881/ac6261](https://doi.org/10.3847%2F1538-3881%2Fac6261), [S2CID](/source/S2CID_(identifier)) [247778438](https://api.semanticscholar.org/CorpusID:247778438)

1. **[^](#cite_ref-6)** von Essen, C.; Cellone, S.; Mallonn, M.; Albrecht, S.; Miculán, R.; Müller, H. M. (2017). "Testing connections between exo-atmospheres and their host stars". *Astronomy & Astrophysics*. **603**: A20. [arXiv](/source/ArXiv_(identifier)):[1703.10647](https://arxiv.org/abs/1703.10647). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201730506](https://doi.org/10.1051%2F0004-6361%2F201730506). [S2CID](/source/S2CID_(identifier)) [119452420](https://api.semanticscholar.org/CorpusID:119452420).

1. **[^](#cite_ref-7)** von Essen, C.; Schröter, S.; Agol, E.; Schmitt, J. H. M. M. (2013). "Qatar-1: Indications for possible transit timing variations". *Astronomy & Astrophysics*. **555**: A92. [arXiv](/source/ArXiv_(identifier)):[1309.1457](https://arxiv.org/abs/1309.1457). [Bibcode](/source/Bibcode_(identifier)):[2013A&A...555A..92V](https://ui.adsabs.harvard.edu/abs/2013A&A...555A..92V). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201321407](https://doi.org/10.1051%2F0004-6361%2F201321407). [S2CID](/source/S2CID_(identifier)) [119174903](https://api.semanticscholar.org/CorpusID:119174903).

1. **[^](#cite_ref-8)** MacIejewski, G.; Fernández, M.; Aceituno, F. J.; Ohlert, J.; Puchalski, D.; Dimitrov, D.; Seeliger, M.; Kitze, M.; Raetz, St.; Errmann, R.; Gilbert, H.; Pannicke, A.; Schmidt, J.-G.; Neuhäuser, R. (2015). "No variations in transit times for Qatar-1 B". *Astronomy & Astrophysics*. **577**: A109. [arXiv](/source/ArXiv_(identifier)):[1503.07191](https://arxiv.org/abs/1503.07191). [Bibcode](/source/Bibcode_(identifier)):[2015A&A...577A.109M](https://ui.adsabs.harvard.edu/abs/2015A&A...577A.109M). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201526031](https://doi.org/10.1051%2F0004-6361%2F201526031). [S2CID](/source/S2CID_(identifier)) [118638934](https://api.semanticscholar.org/CorpusID:118638934).

1. **[^](#cite_ref-9)** Collins, Karen A.; Kielkopf, John F.; Stassun, Keivan G. (2015). ["TRANSIT TIMING VARIATION MEASUREMENTS OF WASP-12b AND QATAR-1b: NO EVIDENCE OF ADDITIONAL PLANETS"](https://doi.org/10.3847%2F1538-3881%2F153%2F2%2F78). *The Astronomical Journal*. **153** (2): 78. [arXiv](/source/ArXiv_(identifier)):[1512.00464](https://arxiv.org/abs/1512.00464). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/153/2/78](https://doi.org/10.3847%2F1538-3881%2F153%2F2%2F78). [S2CID](/source/S2CID_(identifier)) [55191644](https://api.semanticscholar.org/CorpusID:55191644).

1. ^ [***a***](#cite_ref-Thakur2020_10-0) [***b***](#cite_ref-Thakur2020_10-1) Thakur, Parijat; Mannaday, Vineet Kumar; Sahu, Devendra Kumar; Chand, Swadesh; Jiang, Ing-Guey (2020), "Investigating Extra-solar Planetary System Qatar-1 through Transit Observations", *Bulletin de la Société Royale des Sciences de Liège*: 132–136, [arXiv](/source/ArXiv_(identifier)):[2007.03753](https://arxiv.org/abs/2007.03753), [doi](/source/Doi_(identifier)):[10.25518/0037-9565.7577](https://doi.org/10.25518%2F0037-9565.7577), [S2CID](/source/S2CID_(identifier)) [54660279](https://api.semanticscholar.org/CorpusID:54660279)

1. ^ [***a***](#cite_ref-Su2020_11-0) [***b***](#cite_ref-Su2020_11-1) Su, Li-Hsin; Jiang, Ing-Guey; Sariya, Devesh P.; Lee, Chiao-Yu; Yeh, Li-Chin; Mannaday, Vineet Kumar; Thakur, Parijat; Sahu, D. K.; Chand, Swadesh; Shlyapnikov, A. A.; Moskvin, V. V.; Ignatov, Vladimir; Mkrtichian, David; Griv, Evgeny (2021), "Are There Transit Timing Variations for the Exoplanet Qatar-1b?", *The Astronomical Journal*, **161** (3): 108, [arXiv](/source/ArXiv_(identifier)):[2012.08184](https://arxiv.org/abs/2012.08184), [Bibcode](/source/Bibcode_(identifier)):[2021AJ....161..108S](https://ui.adsabs.harvard.edu/abs/2021AJ....161..108S), [doi](/source/Doi_(identifier)):[10.3847/1538-3881/abd4d8](https://doi.org/10.3847%2F1538-3881%2Fabd4d8), [S2CID](/source/S2CID_(identifier)) [229181287](https://api.semanticscholar.org/CorpusID:229181287)

1. **[^](#cite_ref-12)** Mannaday, Vineet Kumar; Thakur, Parijat; Southworth, John; Jiang, Ing-Guey; Sahu, D. K.; Mancini, L.; Vaňko, M.; Kundra, Emil; Gajdoš, Pavol; a-Thano, Napaporn; Sariya, Devesh P.; Yeh, Li-Chin; Griv, Evgeny; Mkrtichian, David; Shlyapnikov, Aleksey (2022), "Revisiting the Transit Timing Variations in the TrES-3 and Qatar-1 Systems with TESS Data", *The Astronomical Journal*, **164** (5): 198, [arXiv](/source/ArXiv_(identifier)):[2209.04080](https://arxiv.org/abs/2209.04080), [Bibcode](/source/Bibcode_(identifier)):[2022AJ....164..198M](https://ui.adsabs.harvard.edu/abs/2022AJ....164..198M), [doi](/source/Doi_(identifier)):[10.3847/1538-3881/ac91c2](https://doi.org/10.3847%2F1538-3881%2Fac91c2), [S2CID](/source/S2CID_(identifier)) [252185524](https://api.semanticscholar.org/CorpusID:252185524)

v t e Constellation of Draco List of stars in Draco Draco in Chinese astronomy Stars Bayer α (Thuban) β (Rastaban) γ (Eltanin) δ (Altais) ε (Tyl) ζ (Aldhibah) η (Athebyne) θ ι (Edasich) κ λ (Giausar) μ (Alrakis) ν (Kuma) ξ (Grumium) ο π ρ σ (Alsafi) τ υ φ χ ψ1 (Dziban) ψ2 ω Flamsteed 4 6 7 (Tianyi) 8 (Taiyi) 10 (i) 15 (A) 18 (g) 19 (h) 26 36 39 (b) 42 (Fafnir) 45 (d) 50 59 64 (e) 68 Variable TW YY AG BY CL CM CX DO EK HP V581 HR 3751 4126 4934 5811 6237 6518 6618 (Alruba) 6817 7137 7783 HD 109246 (Funi) 101364 128717 147379 156279 158259 176693 191939 Other 2MASS 1237+6526 2MASS J17554042+6551277 G 240-72 GD 356 Gliese 420 Gliese 625 Gliese 687 GRW +70 8247 Kepler-4 Kepler-10 Kepler-12 Kepler-90 Kepler-296 KOI-256 LP 71-82 Qatar-1 SDSS J1240+6710 Struve 2398 TOI-1136 WD 1856+534 WISE 1647+5632 WISE 1841+7000 Exoplanets HD 139357 b HD 167042 b ι Dra b (Hypatia) Kepler-4b Kepler-10b c Kepler-12b Kepler-90e f g h i Kepler-296b c d e f TOI-1452 b TrES-2b Star clusters LAMOST 1 Nebulae Cat's Eye Nebula NGC 6742 Galaxies NGC 3147 3197 3735 4121 4125 4221 4236 4319 4331 4332 4363 4441 4513 4545 4589 5678 5777 5866 5866B 5879 5905 5907 5949 5963 5965 5982 5985 6090 6248 6285 6286 6338 6340 6365 6373 6394 6412 6503 6505 6566 6621 6622 6670 6676 6786 6789 Other 1ES 1927+654 1ES 1959+650 3C 249.1 3C 305 3C 319 3C 343 3C 343.1 3C 351 3C 356 3C 371 3C 380 3C 390.3 3C 401 4C +72.26 4C 73.08 8C 1241+735 Abell 2218 BCG Bean galaxy Beaver galaxy BZQ J1727+5510 Draco Dwarf Draco II GB 1508+5714 Goldfish galaxy H1821+643 HFLS3 IERS B1946+708 IRAS F17179+5444 IRAS 18580+6527 J120011.1+680924.8 KKR 25 Markarian 817 Markarian 876 Original TRG PGC 39058 Porphyrion QSO B1823+568 RGZ J172749.5+534647 S5 1803+784 S5 2007+777 SDSS J1715+6008 Tadpole Galaxy UGC 9391 UGC 9405 UGC 11241 UGC 11411 WISEA J145223.62+611707.5 WN B1851+5707 Galaxy clusters Abell 2218 CL1358+62 Draco Supercluster NGC 5866 Group Astronomical events SN 2003jb SN 2005B SN 2016aps Swift J1644+57 Category

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Adapted from the Wikipedia article [Qatar-1](https://en.wikipedia.org/wiki/Qatar-1) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Qatar-1?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.