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Exoplanet List of exoplanets
Exoplanet Comparison HAT-P-12 b.png
Size comparison of HAT-P-12b with Jupiter.
Parent star
Star HAT-P-12
Constellation Canes Venatici
Right ascension (α) 13h 57m 434s
Declination (δ) +43° 29′ 37″
Apparent magnitude (mV) 12.84
Distance464.77 ± 190 ly
(142.5 ± 13.7 pc)
Spectral type K4
Orbital elements
Semi-major axis(a) 0.0384 ± 0.0003[1] AU
Eccentricity (e) 0 (assumed)[1]
Orbital period(P) 3.2130598 ± 0.0000021[1] d
Inclination (i) 89.0 ± 0.4[1]°
Time of transit (Tt) 2,454,419.19556 ± 0.00020[1] JD
Physical characteristics
Mass(m)0.211 ± 0.012[1] MJ
Radius(r)0.959 ± 0.029[1] RJ
Density(ρ)295 ± 25[1] kg m−3
Discovery information
Discovery date April 29, 2009
Discoverer(s) Hartman et al.
Discovery method Transit
Other detection methods Radial velocity
Discovery site Cambridge, Massachusetts
Discovery status Published
Database references
Extrasolar Planets
Exoplanet Archivedata
Open Exoplanet Cataloguedata

HAT-P-12b is an extrasolar planet approximately 465 light years away from Earth, orbiting the 13th magnitude K-type star HAT-P-12, which is located in Canes Venatici constellation. It is a transiting hot Jupiter that was discovered by the HATNet Project on April 29, 2009.

HAT-P-12b is a H/He-dominated gas giant planet with a core mass of 11.3+2.6
M and is moderately irradiated by its low-metallicity host star.[2] Therefore, HAT-P-12b is most likely an H/He-dominated planet with a core of perhaps ~10 M, and a total metal fraction of ~15%. This makes HAT-P-12b the least massive H/He-dominated gas giant planet found to date; the previous record holder was Saturn.[1]

Comparison of "hot Jupiter" exoplanets (artist concept).

From top left to lower right: WASP-12b, WASP-6b, WASP-31b, WASP-39b, HD 189733b, HAT-P-12b, WASP-17b, WASP-19b, HAT-P-1b and HD 209458b.


External links[edit]

Media related to HAT-P-12b at Wikimedia Commons

Coordinates: Sky map 13h 57m 434s, +43° 29′ 37″