Sigma Boötis

From Wikipedia, the free encyclopedia

σ Boötis
Observation data
Epoch J2000.0
Constellation
(pronunciation)		 Boötes
Right ascension 14h 34m 40.8s
Declination +29° 44' 42"
Apparent magnitude (V) +4.47
Distance 50.4 ± 0.6 ly
(15.5 ± 0.2 pc)
Spectral type F2V
Other designations
28 Boötis, HR 5447, HD 128167, Gl 557, BD+30°2536, FK5 1380, HIP 71284, SAO 83416, GC 19659, CCDM 14347+2945

Sigma Boötis (σ Boo / σ Boötis) is a star in the constellation Boötes.

Sigma Boötis is a yellow-white F-type main sequence dwarf with an apparent magnitude of +4.47. It is approximately 50.4 light years from Earth.

Located to the southeast of Rho Boötis, the fusing dwarf Sigma may at first appear as a naked-eye double, but the angular proximity with Rho is merely line-of-sight. Like many of its spectral class, Sigma is apparently a variable of the Delta Scuti variety, which vary subtly with multiple periods of hours.


Sirius  This main sequence star-related article is a stub. You can help Wikipedia by expanding it.