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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: 7:48  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
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All Constellations » Orion » 

51 Orionis

Altitude: -0.9°   Azimuth: 86.5°   Direction: East

51 Orionis is a giant star in the constellation of Orion.

51 Orionis visual magnitude is 4.91. Because of its moderate brightness, 51 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 51 Orionis:


51 Orionis is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -0.9°
Azimuth: 86.5°
Direction: East

Celestial coordinates and finder chart of 51 Orionis

51 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 51 Orionis are provided in the following table:

05h 42m 28s
+01° 28’ 28”

The simplified sky map below shows the position of 51 Orionis in the sky:

Finder chart 51 Orionis star
Simplified finder chart for 51 Orionis.

Visibility of 51 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 51 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: 88.5°
Max altitude: 40.0°
Azimuth: 271.5°

Digitized Sky Survey image of 51 Orionis

The image below is a photograph of 51 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 51 Orionis is -0.058 arcsec per year in Right Ascension and -0.015 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 51 Orionis star
DSS2 image of 51 Orionis. The red arrow shows the motion of 51 Orionis during the next 10000 years (-9.67 arcmin in Right Ascension and -2.50 arcmin in declination);

Distance of 51 Orionis from the Sun and relative movement

51 Orionis is distant 301.85 light years from the Sun and it is moving far from the Sun at the speed of 88 kilometers per second.

92.59 pc
301.85 ly
88 km/s
-0.058 arcsec/year
-0.015 arcsec/year

Spectral properties of 51 Orionis

51 Orionis belongs to spectral class K1 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 51 Orionis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 51 Orionis. Attribution: Richard Powell / CC BY-SA

Alternative designations of 51 Orionis