σ Boötis (sigma Boötis)

Below the horizon. Rise: 13:44 | Tran: 21:54 | Set: 6:01

Alt: -17.17° Az: 1.85° Direction: South-West

σ Boötis is a variable and multiple main-sequence star of spectral class F2 in the constellation of Boötes.

σ Boötis visual magnitude is 4.46. Because of its moderate brightness, σ Boötis is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

DSS2 image of σ Boötis. The red arrow shows the motion of σ Boötis during the next 1000 years (3.15 arcmin in Right Ascension and 2.20 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 14h 35m 46s

Declination +29° 38’ 04”

Hour Angle 12h 08m 06s

Sidereal Time 02h 43m 53s

J2000

Right Ascension 14h 34m 40s

Declination +29° 44’ 42”

Galactic Coordinates

Galactic Longitude 45.62°

Galactic Latitude 67.2°

Finder Chart

Loading map...

Finder chart for σ Boötis (sigma Boötis).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.46

Class Main-sequence

Absolute magnitude 3.51

Spectral Type F2V

Color Index (B-V) 0.36

Temperature 7101K

The red dot in the diagram below shows where σ Boötis is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of σ Boötis. Attribution: Richard Powell / CC BY-SA

Star System Properties

σ Boötis is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the σ Boötis double sysyem:

Main star magnitude 4.46

Secondary star magnitude 9.76

Magnitude difference 5.3

Separation 237.1 arcsec

Distance, Radial Speed, Proper Motion

σ Boötis is distant 50.42 light years from the Sun

Distance (parsec) 15.47

Distance (light year) 50.42

Proper Motion RA 0.189 arcsec/y

Proper Motion Dec 0.132"/y

Alternative Designations

Bayer designation σ Boötis
(sigma Boötis)

Flamsteed designation 28 Boötis

Henry Draper Catalogue HD128167

SAO Catalogue SAO83416

Hipparcos Catalogue HIP71284

Durchmusterung Catalogue BD+30 2536

Gliese Catalogue Gl 557

FK5 Catalogue 1380

General Catalogue of Variable Stars 6717

Visibility from Your Location

Today's σ Boötis (sigma Boötis) rise, transit and set times from St. Catharines, Canada are the following (all times relative to the local timezone America/Toronto):

Azimuth: 60.4° RISE 13:44

Max altitude: 76.5° TRANSIT 21:54

Azimuth: 299.6° SET 6:01

Name:	St. Catharines, Canada
Latitude:	43° 10' 16.7" N
Longitude:	79° 14' 33.7" W
Timezone:	America/Toronto

Set Location

Other stars in Boötes