Alniyat - σ Scorpii (sigma Scorpii)

Below the horizon. Rise: 21:52 | Tran: 1:27 | Set: 4:57

Alt: -17.60° Az: 109.32° Direction: East-South-East

Alniyat, also designated as σ Scorpii (sigma Scorpii), is a variable and multiple giant star of spectral class B1 in the constellation of Scorpius.

Alniyat visual magnitude is 2.89. Because of its brightness, Alniyat is clearly visible to the naked eye when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

Image of Alniyat - σ Scorpii (sigma Scorpii) star

DSS2 image of Alniyat. The red arrow shows the motion of Alniyat during the next 10000 years (-1.67 arcmin in Right Ascension and -3.50 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 16h 22m 44s

Declination -25° 39’ 05”

Hour Angle 18h 14m 51s

Sidereal Time 10h 37m 35s

J2000

Right Ascension 16h 21m 11s

Declination -25° 35’ 34”

Galactic Coordinates

Galactic Longitude 351.31°

Galactic Latitude 17°

Finder Chart

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Finder chart for Alniyat - σ Scorpii (sigma Scorpii).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 2.89

Class Giant

Absolute magnitude -3.87

Spectral Type B1III

Color Index (B-V) 0.13

Temperature 8748K

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

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

Star System Properties

Alniyat is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the Alniyat double sysyem:

Main star magnitude 2.89

Secondary star magnitude 4.89

Magnitude difference 2

Separation 0 arcsec

Distance, Radial Speed, Proper Motion

Alniyat is distant 734.23 light years from the Sun and it is moving far from the Sun at the speed of 3 kilometers per second.

Distance (parsec) 225.23

Distance (light year) 734.23

Radial Speed 3 km/s

Proper Motion RA -0.01 arcsec/y

Proper Motion Dec -0.021"/y

Alternative Designations

Proper Name Alniyat

Bayer designation σ Scorpii
(sigma Scorpii)

Flamsteed designation 20 Scorpii

Henry Draper Catalogue HD147165

SAO Catalogue SAO184336

Hipparcos Catalogue HIP80112

Durchmusterung Catalogue CD-2511485

FK5 Catalogue 607

General Catalogue of Variable Stars Sig Sco

Aitken Double Star Catalogue ADS10009

Visibility from Your Location

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

Azimuth: 115.7° RISE 21:52

Max altitude: 12.9° TRANSIT 1:27

Azimuth: 244.3° SET 4:57

Set Location

Other stars in Scorpius