Beta Ceti information

β Ceti
	Location of β Ceti (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Cetus
Right ascension	00h 43m 35.37090s
Declination	−17° 59′ 11.7827″
Apparent magnitude (V)	2.02
Characteristics
Spectral type	K0 III
U−B color index	+0.88
B−V color index	+1.01
Variable type	Suspected
Astrometry
Radial velocity (Rv)	+12.9 km/s
Proper motion (μ)	RA: +232.55 mas/yr ; Dec.: +31.99 mas/yr
Parallax (π)	33.86 ± 0.16 mas
Distance	96.3 ± 0.5 ly ; (29.5 ± 0.1 pc)
Absolute magnitude (MV)	−0.13
Details
Mass	2.8 M☉
Radius	16.78±0.25 R☉
Luminosity	139.1±7.0 L☉
Surface gravity (log g)	2.7 cgs
Temperature	4,797 K
Metallicity [Fe/H]	−0.09 dex
Rotational velocity (v sin i)	18 km/s
Age	> 1 Gyr
Other designations
	Diphda, Deneb Kaitos, Difda al Thani, Rana Secunda, 16 Cet, BD–18°115, GCTP 134.00, Gj 31, HD 4128, HIP 3419, HR 188, SAO 147420
Database references
SIMBAD	data
ARICNS	data

Beta Ceti (β Ceti, abbreviated Beta Cet, β Cet), officially named Diphda /ˈdɪfdə/,^[13] is the brightest star in the constellation of Cetus. Although designated 'beta', it is actually brighter than the 'alpha' star in the constellation, Menkar, by half a magnitude. This orange giant is easy to identify due to its location in an otherwise dark section of the celestial sphere. Based on parallax measurements, it lies at an estimated distance of 96.3 light-years (29.5 parsecs) from the Sun.^[1]

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Observation data Epoch J2000 Equinox J2000
Location of β Ceti (circled)
Constellation	Cetus
Right ascension	00^h 43^m 35.37090^s^[1]
Declination	−17° 59′ 11.7827″^[1]
Apparent magnitude (V)	2.02^[2]
Characteristics
Spectral type	K0 III^[3]
U−B color index	+0.88^[2]
B−V color index	+1.01^[2]
Variable type	Suspected^[4]
Astrometry

Radial velocity (R_v)	+12.9^[5] km/s
Proper motion (μ)	RA: +232.55^[1] mas/yr Dec.: +31.99^[1] mas/yr
Parallax (π)	33.86 ± 0.16 mas^[1]
Distance	96.3 ± 0.5 ly (29.5 ± 0.1 pc)
Absolute magnitude (M_V)	−0.13^[6]

Details

Mass	2.8^[7] `M`_☉
Radius	16.78±0.25^[8] `R`_☉
Luminosity	139.1±7.0^[8] `L`_☉
Surface gravity (log g)	2.7^[9] cgs
Temperature	4,797^[9] K
Metallicity [Fe/H]	−0.09^[9] dex
Rotational velocity (v sin i)	18^[10] km/s
Age	> 1^[11] Gyr

Other designations
Diphda, Deneb Kaitos, Difda al Thani, Rana Secunda, 16 Cet, BD–18°115, GCTP 134.00, Gj 31, HD 4128, HIP 3419, HR 188, SAO 147420^[12]
Database references
SIMBAD	data
ARICNS	data

Beta Ceti information

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Bayer designation

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Asteroseismology