Tau4 Eridani

From Wikipedia, the free encyclopedia
Jump to: navigation, search

Tau4 Eridani
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Eridanus
Right ascension 3h 19m 31s
Declination −21° 45′ 28″
Apparent magnitude (V) 3.70
Distance 258 ly
(79.14 pc)
Spectral type M3.5III
Other designations
16 Eridani, HD 20720, HR 1003, SAO 168460, FK5 , CSV 6025, BD -22 584 , HIP 15474

Tau4 Eridani4 Eri, τ4 Eri) is a Class M3.5III, fourth-magnitude star in the constellation Eridanus. Tau4 Eridani is a binary star system consisting primarily of Class M components, the brightest component being a Class M giant of apparent magnitude 3.66, having a mass and luminosity many times greater than that of the Sun. It is occasionally eclipsed by other stellar components within the system in ways similar to Algol. The entire star system is located about 260 light-years from Earth.


  • "HD 20720". SIMBAD Astronomical Database. Retrieved 2006-10-29. 

External links[edit]