HD 113703

f Centauri

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Centaurus
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	+4.71
Characteristics
Evolutionary stage	Main sequence
Spectral type	B4V + K0Ve
U−B Template:Engvar	−0.562
B−V Template:Engvar
Astrometry
Radial velocity (Rv)	km/s
Proper motion (μ)	RA: −29.558 mas/yr Dec.: −15.692 mas/yr
Parallax (π)	8.1592±0.1559 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	−0.68
Details
f Cen Aa
Mass	4.39 Template:Solar mass
Surface gravity (log g)	3.99 cgs
Temperature	14,769 K
Rotational velocity (v sin i)	km/s
Age	92 Myr
f Cen C
Mass	0.9 Template:Solar mass
Luminosity	0.49 Template:Solar luminosity
Temperature	5,020 K
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Age	50 Myr
Other designations
Template:Odlist
Database references
SIMBAD	data

HD 113703, also known by the Bayer designation f Centauri, is a multiple star system in the southern constellation of Centaurus. The combined apparent visual magnitude of this system is +4.71, which is sufficient to make it faintly visible to the naked eye. The distance to this system is approximately 400 light years based on parallax measurements. It is a member of the Lower Centaurus Crux subgroup of the Scorpius–Centaurus association.

The primary of f Centauri is a blue-white hued B-type main-sequence star with a stellar classification of B4V. It is a young star with an age estimated at around 92 million years, and is spinning rapidly with a projected rotational velocity of 140 km/s. A close companion with a K magnitude of 9.16, designated component C, was detected in 2002 at an angular separation of . In 2013, a spectroscopic companion to the primary was observed using long baseline interferometry, with the two being designated components Aa and Ab.

A faint, magnitude 10.8 companion, component B, was first reported by J. F. W. Herschel in 1836. As of 2015, it was located at a separation of along a position angle of 78°. This is a K-type star with a class of K0Ve, showing emission in the Calcium H and K lines. It is a known BY Draconis variable star with the designation V1155 Centauri. It shares a common space motion with the primary, indicating a probable physical relationship, and its Gaia Data Release 3 parallax of suggests a distance of 409 light years. The star shows a strong overabundance in lithium, which demonstrates its young age. It is about 0.8 magnitudes above zero age main sequence and thus is still contracting as a post-T Tauri star. X-ray emission has been detected from this star.