HD 15082

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HD 15082
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  02h 26m 51.0583s[1]
Declination +37° 33′ 01.7377″[1]
Apparent magnitude (V) 8.3[2]
Spectral type kA5hA8mF4[3]
B−V color index 0.27[4]
Variable type δ Sct[2]
Radial velocity (Rv)−9.20±2.8[5] km/s
Proper motion (μ) RA: −0.976±0.118[1] mas/yr
Dec.: −8.977±0.105[1] mas/yr
Parallax (π)8.1724 ± 0.0661[1] mas
Distance399 ± 3 ly
(122.4 ± 1.0 pc)
Mass1.55 ± 0.04[3] M
Radius1.51[6] R
Surface gravity (log g)4.3 ± 0.2[2] cgs
Temperature7,400 ± 200[2] K
Metallicity [Fe/H]0.1 ± 0.2[3] dex
Rotational velocity (v sin i)86[2] km/s
Age100[7] Myr
Other designations
BD+36 489, HD 15082, HIP 11397, SAO 55561, WASP-33.
Database references

HD 15082 (also known as WASP-33) is a star located roughly 399 light years away[1] in the northern constellation of Andromeda.[8] The star is a Delta Scuti variable[9] and a planetary transit variable. A hot Jupiter type extrasolar planet, named WASP-33b or HD 15082b, orbits this star with an orbital period of 1.22 days. It is the first Delta Scuti variable known to host a planet.[10]


HD 15082 is an Am star, which makes its stellar classification challenging to discern. The hydrogen lines and effective temperature of the star are similar to spectral type A8, however the calcium II K line resembles that of an A5 star, and the metallic lines are more similar to an F4 star. The spectral type is thus written kA5hA8mF4.[3]


Delta Scuti variables usually exhibit many pulsation modes, and HD 15082 is no exception, with 8 measured high frequency p-modes[9]. Another proposed non-radial mode, which could be induced by tidal interactions with the planet, would make this star also a Gamma Doradus variable.[3]


In 2010, the SuperWASP project announced the discovery of an extrasolar planet, designated HD 15082 b, orbiting the star. The discovery was made by detecting the transit of the planet as it passes in front of its star, an event which occurs every 1.22 days.

The HD 15082 planetary system[3][11][note 1]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b < 4.59 MJ 0.02558 (± 0.00023) 1.21987089 ± 1.5×10−07 0 87.67° 1.438 RJ

See also[edit]


  1. ^ Parameters from the photometric + radial velocity solution in table 3 of Cameron et al. (2010). Different analysis methods result in slightly different parameters, see Cameron et al. (2010) for details.


  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d e Herrero, E.; et al. (February 2011), "WASP-33: the first δ Scuti exoplanet host star" (PDF), Astronomy and Astrophysics, 526: L10, arXiv:1010.1173, Bibcode:2011A&A...526L..10H, doi:10.1051/0004-6361/201015875
  3. ^ a b c d e f Collier Cameron, A.; et al. (2010). "Line-profile tomography of exoplanet transits - II. A gas-giant planet transiting a rapidly rotating A5 star". Monthly Notices of the Royal Astronomical Society. 407 (1): 507. arXiv:1004.4551. Bibcode:2010MNRAS.407..507C. doi:10.1111/j.1365-2966.2010.16922.x.
  4. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy & Astrophysics, 355: L27–L30, Bibcode:2000A&A...355L..27H.
  5. ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  6. ^ Goyal, Jayesh M.; Mayne, Nathan; Sing, David K.; Drummond, Benjamin; Tremblin, Pascal; Amundsen, David S.; Evans, Thomas; Carter, Aarynn L.; Spake, Jessica; Baraffe, Isabelle; Nikolov, Nikolay; Manners, James; Chabrier, Gilles; Hebrard, Eric (2018). "A library of ATMO forward model transmission spectra for hot Jupiter exoplanets". Monthly Notices of the Royal Astronomical Society. 474 (4): 5158. Bibcode:2018MNRAS.474.5158G.
  7. ^ Moya, A.; et al. (November 2011), "High spatial resolution imaging of the star with a transiting planet WASP-33", Astronomy & Astrophysics, 535: A110, arXiv:1110.3160, Bibcode:2011A&A...535A.110M, doi:10.1051/0004-6361/201116889
  8. ^ "WASP-33 b". ETD - Exoplanet Transit Database. Retrieved 2010-04-28.
  9. ^ a b von Essen, C.; Czesla, S.; Wolter, U.; Breger, M.; Herrero, E.; Mallonn, M.; Ribas, I.; Strassmeier, K. G.; Morales, J. C. (2014). "Pulsation analysis and its impact on primary transit modeling in WASP-33". Astronomy and Astrophysics. 561: A48. arXiv:1311.3614. Bibcode:2014A&A...561A..48V. doi:10.1051/0004-6361/201322453.
  10. ^ "Discovery Of A Pulsating Star That Hosts A Giant Planet", Science Daily, January 19, 2011
  11. ^ Zhang, Michael; et al. (2017). "Phase curves of WASP-33b and HD 149026b and a New Correlation Between Phase Curve Offset and Irradiation Temperature". The Astronomical Journal. 155 (2): 83. arXiv:1710.07642. doi:10.3847/1538-3881/aaa458.