Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:48  
clear_day Transit: 12:56  
SunsetSet: 21:05 south
sunny DaytimeWhat's Visible Now
All Constellations » Scorpius » 

ο Scorpii (omicron Scorpii)

ο Scorpii is a variable bright giant star in the constellation of Scorpius.

ο Scorpii visual magnitude is 4.55. Because of its moderate brightness, ο Scorpii should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about ο Scorpii:

Bright giant
ο Scorpii (omicron Scorpii) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of ο Scorpii

ο Scorpii is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of ο Scorpii are provided in the following table:

16h 20m 38s
-24° 10’ 09”

The simplified sky map below shows the position of ο Scorpii in the sky:

Finder chart ο Scorpii (omicron Scorpii) star
Simplified finder chart for ο Scorpii (omicron Scorpii).

Visibility of ο Scorpii from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's ο Scorpii (omicron Scorpii) rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 114.2°
Max altitude: 14.4°
Azimuth: 245.8°
ο Scorpii (omicron Scorpii) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of ο Scorpii

The image below is a photograph of ο Scorpii from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of ο Scorpii is -0.003 arcsec per year in Right Ascension and -0.023 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ο Scorpii (omicron Scorpii) star
DSS2 image of ο Scorpii. The red arrow shows the motion of ο Scorpii during the next 10000 years (-0.50 arcmin in Right Ascension and -3.83 arcmin in declination);

Distance of ο Scorpii from the Sun and relative movement

ο Scorpii is distant 1,176.90 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

361.01 pc
1,176.90 ly
-8 km/s
-0.003 arcsec/year
-0.023 arcsec/year

Spectral properties of ο Scorpii

ο Scorpii belongs to spectral class A5 and has a luminosity class of II corresponding to a bright giant star.


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

HR Diagram
H-R diagram showing the position of ο Scorpii. Attribution: Richard Powell / CC BY-SA

Alternative designations of ο Scorpii

ο Scorpii
(omicron Scorpii)