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: 4:51  
clear_day Transit: 12:56  
SunsetSet: 21:00 south
sunny DaytimeWhat's Visible Now
All Constellations » Aries » 

ο Arietis (omicron Arietis)

ο Arietis is a main-sequence star in the constellation of Aries.

ο Arietis visual magnitude is 5.77. Because of its reltive faintness, ο Arietis should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about ο Arietis:

ο Arietis (omicron Arietis) is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 45°.

Celestial coordinates and finder chart of ο Arietis

ο Arietis 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 Arietis are provided in the following table:

02h 44m 32s
+15° 18’ 42”

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

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

Visibility of ο Arietis 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 Arietis (omicron Arietis) 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: 74.7°
Max altitude: 53.8°
Azimuth: 285.3°
ο Arietis (omicron Arietis) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of ο Arietis

The image below is a photograph of ο Arietis 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 Arietis is -0.002 arcsec per year in Right Ascension and -0.019 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ο Arietis (omicron Arietis) star
DSS2 image of ο Arietis. The red arrow shows the motion of ο Arietis during the next 10000 years (-0.33 arcmin in Right Ascension and -3.17 arcmin in declination);

Distance of ο Arietis from the Sun and relative movement

ο Arietis is distant 482.25 light years from the Sun and it is moving towards the Sun at the speed of 7 kilometers per second.

147.93 pc
482.25 ly
-7 km/s
-0.002 arcsec/year
-0.019 arcsec/year

Spectral properties of ο Arietis

ο Arietis belongs to spectral class B9 and has a luminosity class of V corresponding to a main-sequence star.


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

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

Alternative designations of ο Arietis

ο Arietis
(omicron Arietis)