HAT-P-9b

HAT-P-9b

Exoplanet		List of exoplanets
Size comparison of HAT-P-9b with Jupiter.
Parent star
Star		HAT-P-9
Constellation		Auriga
Right ascension	(α)	07^h 20^m 40.479^s
Declination	(δ)	+37° 08′ 26.17″
Distance		1560 ± 190 ly (480 ± 60 pc)
Spectral type		F
Orbital elements
Semi-major axis	(a)	0.0528 ± 0.002 AU
Periastron	(q)	0.0527 AU
Apastron	(Q)	0.0529 AU
Eccentricity	(e)	~0.0012
Orbital period	(P)	3.92289 ± 0.00004 d (0.0107401 y)
Time of transit	(Tt)	2454417.9077 ± 0.0003 JD
Physical characteristics
Mass	(m)	0.78 ± 0.09 MJ (250 M⊕)
Radius	(r)	1.4 ± 0.06 RJ (15 R⊕) (96 Mm)
Density	(ρ)	380 kg m^−3
Surface gravity	(g)	10.3 m/s² (1.05 g)
Discovery information
Discovery date		June 26, 2008
Discoverer(s)		Shporer et al.
Discovery method		Transit (SuperWASP)
Discovery site		Cambridge, Massachusetts
Discovery status		Published
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data
Exoplanet Archive		data
Open Exoplanet Catalogue		data

HAT-P-9b is an exoplanet approximately 1560 light years away in the constellation Auriga. This planet was found by the transit method on June 26, 2008. It has a mass 78% that of Jupiter and a radius 140% that of Jupiter. As with most transiting planets, this planet is a hot Jupiter, meaning this Jupiter-like planet orbits extremely close to its parent star, taking only 3.92 days to orbit.^[1]

References

1. Shporer, Avi; et al. (2009). "HAT-P-9b: A Low-Density Planet Transiting a Moderately Faint F Star". The Astrophysical Journal. 690 (2): 1393–1400. arXiv:0806.4008. Bibcode:2009ApJ...690.1393S. doi:10.1088/0004-637X/690/2/1393.

External links

Media related to HAT-P-9b at Wikimedia Commons

Coordinates: 07^h 20^m 40.479^s, +37° 08′ 26.17″