σ Ophiuchi (sigma Ophiuchi)

Above the horizon. Rise: 12:28 | Tran: 18:47 | Set: 1:09

Alt: 38.09° Az: 146.93° Direction: South-South-East

σ Ophiuchi is a variable bright giant star of spectral class K2 in the constellation of Ophiuchus.

σ Ophiuchi visual magnitude is 4.34. Because of its moderate brightness, σ Ophiuchi 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.

Image of σ Ophiuchi (sigma Ophiuchi) star

DSS2 image of σ Ophiuchi. The red arrow shows the motion of σ Ophiuchi during the next 100000 years (6.67 arcmin in Right Ascension and 11.67 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 17h 27m 44s

Declination +04° 07’ 14”

Hour Angle 22h 17m 57s

Sideral Time 15h 45m 42s

J2000

Right Ascension 17h 26m 30s

Declination +04° 08’ 25”

Galactic Coordinates

Galactic Longitude 26.77°

Galactic Latitude 20.75°

Finder Chart

Simplified finder chart for σ Ophiuchi (sigma Ophiuchi).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.34

Class Bright giant

Absolute magnitude -3.44

Spectral Type K2II

Color Index (B-V) 1.5

Temperature 3794K

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

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

Distance, Radial Speed, Proper Motion

σ Ophiuchi is distant 1,172.66 light years from the Sun and it is moving towards the Sun at the speed of 27 kilometers per second.

Distance (parsec) 359.71

Distance (light year) 1,172.66

Radial Speed -27 km/s

Proper Motion RA 0.004 arcsec/y

Proper Motion Dec 0.007"/y

Alternative Designations

Bayer designation σ Ophiuchi
(sigma Ophiuchi)

Flamsteed designation 49 Ophiuchi

Henry Draper Catalogue HD157999

SAO Catalogue SAO122387

Hipparcos Catalogue HIP85355

Durchmusterung Catalogue BD+04 3422

FK5 Catalogue 1459

General Catalogue of Variable Stars 8664

Visibility from Your Location

Today's σ Ophiuchi (sigma Ophiuchi) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 85.9° RISE 12:28

Max altitude: 42.6° TRANSIT 18:47

Azimuth: 274.1° SET 1:09

Name:	Greenwich, UK
Latitude:	51° 28' 48.0" N
Longitude:	0° 0' 0.0" E
Timezone:	Europe/London

Location

Other stars in Ophiuchus