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: 4:46  
clear_day Transit: 12:56  
SunsetSet: 21:07 south
sunny DaytimeWhat's Visible Now
All Constellations » Orion » 

55 Orionis

55 Orionis is a variable sub-giant star in the constellation of Orion.

55 Orionis visual magnitude is 5.35. Because of its reltive faintness, 55 Orionis 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 55 Orionis:


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

Altitude: -4.8°
Azimuth: 96.1°
Direction: East

Celestial coordinates and finder chart of 55 Orionis

55 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 55 Orionis are provided in the following table:

05h 51m 21s
-07° 31’ 05”

The simplified sky map below shows the position of 55 Orionis in the sky:

Finder chart 55 Orionis star
Simplified finder chart for 55 Orionis.

Visibility of 55 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 55 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: 97.5°
Max altitude: 31.0°
Azimuth: 262.5°
55 Orionis is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 55 Orionis

The image below is a photograph of 55 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 55 Orionis is -0.001 arcsec per year in Right Ascension and 0.003 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of 55 Orionis star
DSS2 image of 55 Orionis. The red arrow shows the motion of 55 Orionis during the next 100000 years (-1.67 arcmin in Right Ascension and 5.00 arcmin in declination);

Distance of 55 Orionis from the Sun and relative movement

55 Orionis is distant 1,680.41 light years from the Sun and it is moving far from the Sun at the speed of 20 kilometers per second.

515.46 pc
1,680.41 ly
20 km/s
-0.001 arcsec/year
0.003 arcsec/year

Spectral properties of 55 Orionis

55 Orionis belongs to spectral class B2 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where 55 Orionis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 55 Orionis. Attribution: Richard Powell / CC BY-SA

Alternative designations of 55 Orionis