Beta Horologii

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β Horologii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Horologium
Right ascension 02h 58m 47.7967s[1]
Declination −64° 04′ 16.623″[1]
Apparent magnitude (V) 4.979[1]
Spectral type A4IIIm...[1]
U−B color index +0.15[2]
B−V color index +0.13[2]
R−I color index +0.05[2]
Radial velocity (Rv) 23.6 ± 2[1] km/s
Proper motion (μ) RA: 22.96[1] mas/yr
Dec.: 5.39[1] mas/yr
Parallax (π) 10.40 ± 0.50[1] mas
Distance 310 ± 20 ly
(96 ± 5 pc)
Absolute magnitude (MV) 0.1[3]
Radius 1.40[4] R
Rotational velocity (v sin i) 84[2] km/s
Other designations
β Hor, Beta Horologii, Beta Hor, CPD−64 215, FK5 2212, GC 3611, HD 18866, HIP 13884, HR 909, PPM 353263, SAO 248701.[1]
Database references

Beta Horologii (Beta Hor, β Horologii, β Hor) is the third-brightest star in the constellation of Horologium. It is an A-type giant star with an apparent visual magnitude of approximately 4.979, and is a chemically peculiar star of the metallic-line type.[1]


  1. ^ a b c d e f g h i j * bet Hor -- Star, database entry, SIMBAD. Accessed on line September 18, 2008.
  2. ^ a b c d HR 909, 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 18, 2008.
  3. ^ From apparent magnitude and parallax.
  4. ^ HD 18866, 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 18, 2008.

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