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Exoplanet List of exoplanets
Exoplanet Comparison HAT-P-3 b.png
Size comparison of HAT-P-3b with Jupiter.
Parent star
Star HAT-P-3
Constellation Ursa Major
Right ascension (α) 13h 44m 23s
Declination (δ) +48° 01′ 43″
Distance 457 ± 42 ly
(140 ± 13 pc)
Spectral type K[1]
Orbital elements
Semi-major axis (a) 0.03894 AU
Eccentricity (e) 0
Orbital period (P) 2.899703 d
Inclination (i) 87.24°
Argument of
Time of periastron (T0) 2454218.7598 ± 0.0029 JD
Semi-amplitude (K) 89.1 ± 2.0 m/s
Physical characteristics
Mass (m) 0.599 ± 0.026[1] MJ
Radius (r) 0.890 ± 0.046[1] RJ
Density (ρ) 1060 ± 170[1] kg m−3
Surface gravity (g) 12.3 m/s² (1.25 g)
Discovery information
Discovery date 28 July 2007
Discoverer(s) HATNet Project
Discovery method Transit
Discovery status Published

HAT-P-3b is an extrasolar planet that orbits the star HAT-P-3 approximately 457 light-years away in the constellation of Ursa Major. It was discovered by the HATNet Project via the transit method and confirmed with Doppler spectrography, so both its mass and radius are known quite precisely; based on these figures it is predicted that the planet has about 75 Earth masses worth of heavy elements in its core, making it similar to the planet HD 149026b.[1]

In 2013, this planet was photometrically observed by Spitzer space telescope which characterized its near-zero eccentricity and low albedo.[2]

See also[edit]


  1. ^ a b c d e Torres, G.; et al. (2007). "HAT-P-3b: A Heavy-Element-rich Planet Transiting a K Dwarf Star". The Astrophysical Journal Letters. 666 (2): L121–L124. arXiv:0707.4268Freely accessible. Bibcode:2007ApJ...666L.121T. doi:10.1086/521792. 
  2. ^ Todorov, Kamen O.; et al. (2013). "Warm Spitzer Photometry of Three Hot Jupiters: HAT-P-3b, HAT-P-4b and HAT-P-12b". The Astrophysical Journal. 770 (2). 102. arXiv:1305.0833Freely accessible. Bibcode:2013ApJ...770..102T. doi:10.1088/0004-637X/770/2/102. 

External links[edit]

Media related to HAT-P-3b at Wikimedia Commons

Coordinates: Sky map 13h 44m 23s, +48° 01′ 43″