79 Ceti

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**79 Ceti b**
Observation data Epoch J2000.0
Constellation	Cetus
Right ascension	02^h 35^m 19.9283^s
Declination	-03° 33′ 38.167″
Apparent magnitude (V)	+6.78
Spectral Characteristics
Spectral type	G5IV
U-B color index	?
B-V color index	?
Variable type	none
Astrometry
Radial velocity (R_v)	-53 km/s
Proper motion (μ)	RA: -156.89 mas/yr Dec.: -437.07 mas/yr
Parallax (π)	27.85 ± 1.39 mas
Distance	117.1 ly (35.91 pc)
Absolute magnitude (M_V)	4.00
Physical Characteristics
Mass	1 M_☉
Radius	1.57 R_☉
Luminosity	? L_☉
Temperature	5770 K
Metallicity	1.65 × Solar
Rotation	?
Age	? years
Other designations
HD 16141, GJ 9085, HIP 12048

79 Ceti (also known as HD 16141) is a yellow subgiant star approximately 117 light-years away in the constellation Cetus. It has stopped hydrogen fusion in its core, this implies an age much higher than our Sun's 4.5 billion years. Eventually the outer layers of the star will expand and cool and the star will become a red giant. Currently 79 Ceti has a luminosity twice that of the Sun.

As of 2000, an extrasolar planet is known to orbit 79 Ceti.

[edit] 79 Ceti b

**79 Ceti b**
Orbital elements
Extrasolar planet		Lists of extrasolar planets
An artist's conception of 79 Ceti b
Semimajor axis	(a)	0.363±0.021 AU
Eccentricity	(e)	0.252±0.052
Orbital period	(P)	75.523±0.055 d
Inclination	(i)	?°
Longitude of periastron	(ω)	42±14°
Time of periastron	(τ)	2,450,338.0±3.0 JD
Physical characteristics
Mass	(m)	>0.260±0.028 M_J
Radius	(r)	? R_J
Density	(ρ)	? kg/m³
Temperature	(T)	? K
Discovery information
Discovery date		2000
Discoverer(s)		Marcy et al.
Detection method		Doppler Spectroscopy
Discovery status		Confirmed

79 Ceti b (also known as HD 16141 b) is an extrasolar planet orbiting its star every 75 days. With HD 46375 b it was the first known extrasolar planet to have minimum mass less than one Saturn.