HAT-P-9

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title: "HAT-P-9" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["auriga", "f-type-stars", "planetary-transit-variables", "planetary-systems-with-one-confirmed-planet", "tess-objects-of-interest", "stars-with-proper-names"] description: "F-type star in the constellation Auriga" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/HAT-P-9" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary F-type star in the constellation Auriga ::

| name = HAT-P-9 / Tevel}} | image = [[File:HAT-P-9 Size Comparison.png|260px]] | caption = The Size Comparison of HAT-P-9 System (Tevel). | epoch = J2000 | constell = Auriga | ra = | dec = | appmag_v = 12.34 ± 0.27 | class = F | appmag_1_passband = B | appmag_1 = 12.35 ± 0.23 | appmag_2_passband = V | appmag_2 = 12.34 ± 0.27 | appmag_3_passband = J | appmag_3 = 11.274 ± 0.022 | appmag_4_passband = H | appmag_4 = 11.04 ± 0.03 | appmag_5_passband = K | appmag_5 = 11.015 ± 0.021 | variable = planetary transit | radial_v = | prop_mo_ra = | prop_mo_dec = | pm_footnote = | parallax = 2.1626 | p_error = 0.0140 | parallax_footnote = | absmag_v = | mass = | radius = | luminosity = | gravity = | temperature = 6253 ± 84 | metal_fe = 0.16 ± 0.09 | rotational_velocity = 13.4 ± 1.4 | age_gyr = 1.6 | names = , HAT-P-9 | Simbad = HAT-P-9 | NSTED = HAT-P-9

HAT-P-9 is a magnitude 12 F-type star approximately 1500 light-years away in the constellation Auriga. A search for a binary companion star using adaptive optics at the MMT Observatory was negative.

Naming

The star HAT-P-9 is named Tevel. The name was selected in the NameExoWorlds campaign by Israel, during the 100th anniversary of the IAU. The Hebrew word תֵבֵל tevel means "World" or "Universe".

Planetary system

An exoplanet orbiting the star, HAT-P-9b, was discovered by the transit method on June 26, 2008. This is a low-density hot Jupiter, orbiting its star in just 3.9 days.

| table_ref = | exoplanet = b / Alef | mass = | period = | semimajor = | eccentricity = | inclination = | radius =

References

References

1. "SIMBAD query result: TYC 2463-281-1 -- Star". [[Centre de Données astronomiques de Strasbourg]].
2. "Approved names".
3. "International Astronomical Union {{!}} IAU".
4. (2013). "Adaptive Optics Images. II. 12 Kepler Objects of Interest and 15 Confirmed Transiting Planets". The Astronomical Journal.
5. {{Cite Gaia DR3. 898130030131443584
6. {{Cite constellation. HAT-P-9
7. (2009). "HAT-P-9b: A Low-Density Planet Transiting a Moderately Faint F Star".
8. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal.
9. (June 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 & Astrophysics]].
10. (February 2019). "Transiting Exoplanet Monitoring Project (TEMP). V. Transit Follow Up for HAT-P-9b, HAT-P-32b, and HAT-P-36b". [[The Astronomical Journal]].

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