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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:51  
clear_day Transit: 11:50  
SunsetSet: 15:49 south
sleep NighttimeWhat's Visible Now?
All Constellations » Orion » 

ο1 Orionis (omicron1 Orionis)

Altitude: 49.8°   Azimuth: 209.2°   Direction: South-South-West

ο1 Orionis is a variable star in the constellation of Orion.

ο1 Orionis visual magnitude is 4.74. Because of its moderate brightness, ο1 Orionis 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 ο1 Orionis:


ο1 Orionis (omicron1 Orionis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 49.8°
Azimuth: 209.2°
Direction: South-South-West

Celestial coordinates and finder chart of ο1 Orionis

ο1 Orionis 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 ο1 Orionis are provided in the following table:

04h 52m 32s
+14° 15’ 02”

The simplified sky map below shows the position of ο1 Orionis in the sky:

Finder chart ο1 Orionis (omicron1 Orionis) star
Simplified finder chart for ο1 Orionis (omicron1 Orionis).

Visibility of ο1 Orionis 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 ο1 Orionis (omicron1 Orionis) 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: 75.7°
Max altitude: 52.8°
Azimuth: 284.3°

Digitized Sky Survey image of ο1 Orionis

The image below is a photograph of ο1 Orionis 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 ο1 Orionis is 0 arcsec per year in Right Ascension and -0.057 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ο1 Orionis (omicron1 Orionis) star
DSS2 image of ο1 Orionis. The red arrow shows the motion of ο1 Orionis during the next 10000 years (0.00 arcmin in Right Ascension and -9.50 arcmin in declination);

Distance of ο1 Orionis from the Sun and relative movement

ο1 Orionis is distant 541.53 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

166.11 pc
541.53 ly
-8 km/s
-0.057 arcsec/year

Spectral properties of ο1 Orionis

ο1 Orionis belongs to spectral class S3


The red dot in the diagram below shows where ο1 Orionis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of ο1 Orionis. Attribution: Richard Powell / CC BY-SA

Alternative designations of ο1 Orionis

ο1 Orionis
(omicron1 Orionis)