HAT-P-14b

---

title: "HAT-P-14b" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["exoplanets-discovered-in-2010", "giant-planets", "transiting-exoplanets", "hercules-(constellation)", "exoplanets-with-proper-names", "hot-jupiters", "exoplanets-discovered-by-hatnet"] description: "Exoplanet in the constellation of Hercules" topic_path: "general/exoplanets-discovered-in-2010" source: "https://en.wikipedia.org/wiki/HAT-P-14b" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Exoplanet in the constellation of Hercules ::

::data[format=table title="Infobox planet"]

Field	Value
name	HAT-P-14b / Sissi
alt_names	WASP-27b, Sissi
image	Exoplanet Comparison HAT-P-14 b.png
caption	Size comparison of Jupiter with HAT-P-14b.
	discoverer
discovered	2010-03-10
discovery_method	Transit
	apsis
semimajor	AU
eccentricity
period
inclination	84.1167
star	HAT-P-14
	mean_radius
mass
single_temperature	1566
surface_grav	7.49 g
::

| name = HAT-P-14b / Sissi | alt_names = WASP-27b, Sissi | image = Exoplanet Comparison HAT-P-14 b.png | caption = Size comparison of Jupiter with HAT-P-14b. | discoverer = HATNet Project | discovered = 2010-03-10 | discovery_method = Transit | apsis = astron | semimajor = AU | eccentricity = | period = | inclination = 84.1167 | star = HAT-P-14 | mean_radius = 1.101 | mass =
| single_temperature = 1566 | surface_grav = 7.49 g HAT-P-14b, officially named Sissi also known as WASP-27b, is an extrasolar planet located approximately 224.2 ± 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. It was independently detected by the SuperWASP project.

Host star

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 , a radius of , and a surface temperature of . The star HAT-P-14 is named Franz.

History

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.

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.

Orbit

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, spin-orbit angle equal to -170.9°.

References

References

1. The Exoplanet Handbook By Michael Perryman, p.727
2. {{SIMBAD link. HAT-P-14. HAT-P-14
3. (1995). "The Extrasolar Planet Encyclopaedia — HAT-P-14 b". [[Extrasolar Planets Encyclopaedia]].
4. "International Astronomical Union {{!}} IAU".
5. "Approved names".
6. (2023). "The Science Performance of JWST as Characterized in Commissioning". Publications of the Astronomical Society of the Pacific.
7. (2012). "Obliquities of Hot Jupiter Host Stars: Evidence for Tidal Interactions and Primordial Misalignments". The Astrophysical Journal.
8. (2021). "Critical Analysis of Tess Transit Photometric Data: Improved Physical Properties for Five Exoplanets". The Astronomical Journal.
9. (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.
10. {{Cite Gaia DR3. 1340497608486742400
11. (2011). "Independent Discovery of the Transiting Exoplanet HAT-P-14b". The Astronomical Journal.
12. (2010). "HAT-P-14b: A 2.2 MJ Exoplanet Transiting a Bright F Star". The Astrophysical Journal.
13. (2011). "Orbital Orientations of Exoplanets: HAT-P-4b is Prograde and HAT-P-14b is Retrograde". The Astronomical Journal.

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