HAT-P-12b

HAT-P-12b
Parent star
Extrasolar planet		List of extrasolar planets
Size comparison of HAT-P-12b with Jupiter.
Star		HAT-P-12
Constellation		Canes Venatici
Right ascension	(α)	13^h 57^m 434^s
Declination	(δ)	+43° 29′ 37″
Apparent magnitude	(m_V)	12.84
Distance		464.77 ± 190 ly (142.5 ± 13.7 pc)
Spectral type		K4
Orbital elements
Semimajor 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	(T_t)	2,454,419.19556 ± 0.00020^[1] JD
Physical characteristics
Mass	(m)	0.211 ± 0.012^[1] M_J
Radius	(r)	0.959 ± 0.029^[1] R_J
Density	(ρ)	295 ± 25^[1] kg m^-3
Discovery information
Discovery date		April 29, 2009
Discoverer(s)		Hartman et al.
Detection method		Transit
Discovery site		Cambridge, Massachusetts
Discovery status		Preprint
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data

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.

References

^ ^a ^b ^c ^d ^e ^f ^g ^h J. D. Hartman; G. Á. Bakos; G. Torre; Géza Kovács; R. W. Noyes; A. Pál; D. W. Latham; B. Sipöcz; D. A. Fischer; J. A. Johnson; G. W. Marcy; R. P. Butler; A. W. Howard; G. A. Esquerdo; D. D. Sasselov; Gábor Kovács; R. P. Stefanik; J. M. Fernandez; J. Lázár; I. Papp; P. Sári (2009). "HAT-P-12b: A Low-Density Sub-Saturn Mass Planet Transiting a Metal-Poor K Dwarf". arXiv:0904.4704 [astro-ph].

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