Beta Circini

From Wikipedia, the free encyclopedia
Jump to: navigation, search
β Circini
Circinus IAU.svg
Red circle.svg

Location of β Circini (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Circinus
Right ascension 15h 17m 30.8494s[1]
Declination −58° 48′ 04.349″[1]
Apparent magnitude (V) 4.069[1]
Spectral type A3Va[1]
U−B color index +0.09[2]
B−V color index +0.09[2]
Radial velocity (Rv) 9.6 ± 2[1] km/s
Proper motion (μ) RA: −98.39[1] mas/yr
Dec.: −135.46[1] mas/yr
Parallax (π) 33.75 ± 0.75[1] mas
Distance 97 ± 2 ly
(29.6 ± 0.7 pc)
Absolute magnitude (MV) 1.71[3]
Radius 1.3[4] R
Surface gravity (log g) 4.281[5] cgs
Temperature 8,892[5] K
Rotational velocity (v sin i) 59[2] km/s
Age 166+212
[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.[1]
Database references

Beta Circini (Beta Cir, β Circini, β Cir) is an A-type main sequence star and is the second brightest star in the constellation of Circinus.[1] It has an apparent visual magnitude of approximately 4.069.[1] It has one known planet β Circini b.

Planetary System[edit]

The β Circini planetary system[6]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
β Circini b 56.0 (± 7.0) MJ 6656.0


  1. ^ a b c d e f g h i j k * bet Cir -- Star, database entry, SIMBAD. Accessed on line September 5, 2008.
  2. ^ 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.
  3. ^ From apparent magnitude and parallax.
  4. ^ HD 135379, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line September 5, 2008.
  5. ^ a b c Song, Inseok; et al. (February 2001), "Ages of A-Type Vega-like Stars from uvbyβ Photometry", The Astrophysical Journal, 546 (1): 352–357, arXiv:astro-ph/0010102free to read, Bibcode:2001ApJ...546..352S, doi:10.1086/318269 
  6. ^ "β Circini b". Retrieved 2015-10-30.