Beta Circini

β Circini

Template:Location mark Location of β Circini (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Circinus
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	4.069
Characteristics
Spectral type	A3 Va
U−B Template:Engvar	+0.09
B−V Template:Engvar	+0.09
Astrometry
Radial velocity (Rv)	km/s
Proper motion (μ)	RA: −97.182 mas/yr Dec.: −136.055 mas/yr
Parallax (π)	35.8205±0.2515 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	+1.64
Details
Mass	Template:Solar mass
Radius	1.92 Template:Solar radius
Luminosity	19 Template:Solar luminosity
Surface gravity (log g)	4.281 cgs
Temperature	K
Metallicity [Fe/H]	0.16 dex
Rotational velocity (v sin i)	59 km/s
Age	Myr
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
β Cir, Beta Circini, Beta Cir, CPD−58 5875, FK5 561, GC 20526, GJ 580.1, GJ 9516, HD 135379, HIP 74824, HR 5670, PPM 343590, SAO 242384.
Database references
SIMBAD	data

Beta Circini, Latinized from β Circini, is an A-type main sequence star and is the second-brightest star in the constellation of Circinus. It has an apparent visual magnitude of approximately 4.069, which is bright enough to be viewed with the naked eye. Based upon an annual parallax shift of as seen from the Earth, it is located 91 light years from the Sun.

With a stellar classification of A3 Va, this is an main-sequence star fusing atoms of hydrogen into helium at its core. It is between 370 and 500 million years old with around 1.9 times the Sun's radius. The star is radiating 19 times the Sun's luminosity from its photosphere at an effective temperature of 8,676 K. It has one known sub-stellar companion.

Substellar companion

Beta Circini b is a distant brown dwarf companion orbiting the host star at a distance of 6,656 AU. It was detected as a proper motion companion to Beta Circini in 2015 by L.C. Smith and collaborators. Using BHAC15 isochrones, its mass is estimated at Template:Solar mass, or Template:Jupiter mass. It has a stellar classification of L1 and a temperature of .

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