Beta Circini

β Circini
Location of β Circini (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Circinus
Right ascension 15h 17m 30.8488s[1]
Declination −58° 48′ 04.3384″[1]
Apparent magnitude (V) 4.069[2]
Characteristics
Spectral type A3 Va[2]
U−B color index +0.09[3]
B−V color index +0.09[3]
Astrometry
Radial velocity (Rv)9.6 ± 2[2] km/s
Proper motion (μ) RA: −96.742±0.491[1] mas/yr
Dec.: −136.541±0.621[1] mas/yr
Parallax (π)35.1736 ± 0.4253 mas[1]
Distance93 ± 1 ly
(28.4 ± 0.3 pc)
Absolute magnitude (MV)+1.64[4]
Details
Mass1.96+0.03
−0.01[5] M☉
Radius1.92[6] R☉
Luminosity19[4] L☉
Surface gravity (log g)4.281[7] cgs
Temperature8676±33[5] K
Metallicity [Fe/H]0.16[4] dex
Rotational velocity (v sin i)59[3] km/s
Age370–500[5] Myr
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.[2]
Database references
SIMBADdata

Beta Circini, Latinized from β Circini, is an A-type main sequence star and is the second-brightest star in the constellation of Circinus.[2] It has an apparent visual magnitude of approximately 4.069,[2] which is bright enough to be viewed with the naked eye. Based upon an annual parallax shift of 35.17 mas as seen from the Earth,[2] it is located about 93 light years from the Sun.

With a stellar classification of A3 Va,[2] this is an main-sequence star fusing atoms of hydrogen into helium at its core. It is between 370 and 500 million years old[5] with around 1.9[6] times the Sun's radius. The star is radiating 19[4] times the Sun's luminosity from its photosphere at an effective temperature of 8,676 K.[5] It has one known sub-stellar companion.

  1. ^ a b c d e Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h "* bet Cir". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 5, 2008.
  3. ^ a b c HR 5670, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 5, 2008.
  4. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference Smith2015 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference cotten was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference apj546_1_352 was invoked but never defined (see the help page).