Coordinates: Sky map 17h 20m 28s, +38° 14′ 32″
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HAT-P-14b / Sissi
Size comparison of Jupiter with HAT-P-14b.
Discovered byHATNet Project[1]
Discovery date2010-03-10
WASP-27b, Sissi
Orbital characteristics
4.627686±0.000077 d[3]
Physical characteristics
Mean radius
1.101±0.036[3] RJ
Mass2.444±0.060[3] MJ
7.49±0.36 g

HAT-P-14b, officially named Sissi also known as WASP-27b,[4] is an extrasolar planet located approximately 224.2 ± 0.6 parsecs (731.2 ± 2.0 ly)[5] away in the constellation of Hercules, orbiting the 10th magnitude F-type main-sequence star HAT-P-14. This planet was discovered in 2010 by the HATNet Project using the transit method.[1] It was independently detected by the SuperWASP project.[6]

Host star[edit]

The host star is a main-sequence star with the spectral classification F5V and apparent magnitude 9.98, well below the naked-eye visibility limit. It has a mass of 1.386±0.045 M, a radius of 1.468±0.054 R, and a surface temperature of 6477+13


The planet HAT-P-14b was named Sissi. The name was selected by Austria as part of the NameExoWorlds campaign for the 100th anniversary of the IAU. The planet was named after the character Sissi in the movie Sissi, who is married to Franz. The role is played by the actress Romy Schneider. The star HAT-P-14 is named Franz.[9][10]

HAT-P-14b was selected as the target object for testing the James Webb Space Telescope instruments intended for spectroscopic studies of transiting exoplanets. It was chosen because its high surface gravity should produce a very flat spectrum, regardless of the planet's composition.[11]


HAT-P-14b is located very close orbit to its star, taking only 4.6 days to complete one orbit. Observations of the Rossiter–McLaughlin effect with the Keck telescope show that it orbits in a retrograde fashion relative to the rotation axes of its parent star,[12] spin-orbit angle equal to -170.9±5.1°.[13]


  1. ^ a b Torres, G.; et al. (2010). "HAT-P-14b: A 2.2 MJ Exoplanet Transiting a Bright F Star". The Astrophysical Journal. 715 (1): 458–467. arXiv:1003.2211. Bibcode:2010ApJ...715..458T. doi:10.1088/0004-637X/715/1/458. S2CID 119184690.
  2. ^ Bonomo, A. S.; et al. (2017). "The GAPS Programme with HARPS-N at TNG . XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy and Astrophysics. 602. A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. S2CID 118923163.
  3. ^ a b c d e Saha, Suman; Sengupta, Sujan (2021), "Critical Analysis of Tess Transit Photometric Data: Improved Physical Properties for Five Exoplanets", The Astronomical Journal, 162 (5): 221, arXiv:2109.11366, Bibcode:2021AJ....162..221S, doi:10.3847/1538-3881/ac294d, S2CID 237605336
  4. ^ The Exoplanet Handbook By Michael Perryman, p.727
  5. ^ a b Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  6. ^ Simpson, E. K.; et al. (2011). "Independent Discovery of the Transiting Exoplanet HAT-P-14b". The Astronomical Journal. 141 (5). 161. arXiv:1009.3470. Bibcode:2011AJ....141..161S. doi:10.1088/0004-6256/141/5/161. S2CID 19645379.
  7. ^ HAT-P-14
  8. ^ "The Extrasolar Planet Encyclopaedia — HAT-P-14 b". exoplanet.eu.
  9. ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  10. ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  11. ^ Rigby, Jane; Perrin, Marshall; McElwain, Michael; Kimble, Randy; Friedman, Scott; Lallo, Matt; Doyon, René; Feinberg, Lee; Ferruit, Pierre; Glasse, Alistair; Rieke, Marcia; et al. (2023). "The Science Performance of JWST as Characterized in Commissioning". Publications of the Astronomical Society of the Pacific. 135 (1046): 048001. arXiv:2207.05632. Bibcode:2023PASP..135d8001R. doi:10.1088/1538-3873/acb293. S2CID 253735464.
  12. ^ Winn, Joshua N.; et al. (2011). "Orbital Orientations of Exoplanets: HAT-P-4b is Prograde and HAT-P-14b is Retrograde". The Astronomical Journal. 141 (2). 63. arXiv:1010.1318. Bibcode:2011AJ....141...63W. doi:10.1088/0004-6256/141/2/63. S2CID 18752702.
  13. ^ Albrecht, Simon; Winn, Joshua N.; Johnson, John A.; Howard, Andrew W.; Marcy, Geoffrey W.; Butler, R. Paul; Arriagada, Pamela; Crane, Jeffrey D.; Shectman, Stephen A.; Thompson, Ian B.; Hirano, Teruyuki; Bakos, Gaspar; Hartman, Joel D. (2012), "Obliquities of Hot Jupiter Host Stars: Evidence for Tidal Interactions and Primordial Misalignments", The Astrophysical Journal, 757 (1): 18, arXiv:1206.6105, Bibcode:2012ApJ...757...18A, doi:10.1088/0004-637X/757/1/18, S2CID 17174530

External links[edit]

Media related to HAT-P-14b at Wikimedia Commons