σ Boötis (sigma Boötis)

Below the horizon. Rise: 15:47 | Tran: 20:12 | Set: 0:37

Alt: -4.72° Az: 303.19° Direction: West-North-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 47s

Declination +29° 38’ 03”

Hour Angle 04h 54m 32s

Sidereal Time 19h 30m 19s

J2000

Right Ascension 14h 34m 40s

Declination +29° 44’ 42”

Galactic Coordinates

Galactic Longitude 45.62°

Galactic Latitude 67.2°

Finder Chart

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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 Thebarton, Australia are the following (all times relative to the local timezone Australia/Adelaide):

Azimuth: 60.4° RISE 15:47

Max altitude: 25.4° TRANSIT 20:12

Azimuth: 299.6° SET 0:37

Name:	Thebarton, Australia
Latitude:	34° 55' 0.1" S
Longitude:	138° 34' 1.2" E
Timezone:	Australia/Adelaide

Set Location

Other stars in Boötes