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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: 7:49  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
wb_twilight Civil TwilightWhat's Visible Now?
All Constellations » Orion » 

45 Orionis

Altitude: -26.0°   Azimuth: 62.5°   Direction: East-North-East

45 Orionis is a multiple hypergiant star in the constellation of Orion.

45 Orionis visual magnitude is 5.26. Because of its reltive faintness, 45 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 45 Orionis:


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

Altitude: -26.0°
Azimuth: 62.5°
Direction: East-North-East

Celestial coordinates and finder chart of 45 Orionis

45 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 45 Orionis are provided in the following table:

05h 35m 39s
-04° 51’ 20”

The simplified sky map below shows the position of 45 Orionis in the sky:

Finder chart 45 Orionis star
Simplified finder chart for 45 Orionis.

Visibility of 45 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 45 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: 94.9°
Max altitude: 33.7°
Azimuth: 265.1°

Digitized Sky Survey image of 45 Orionis

The image below is a photograph of 45 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 45 Orionis is 0.009 arcsec per year in Right Ascension and 0.011 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 45 Orionis star
DSS2 image of 45 Orionis. The red arrow shows the motion of 45 Orionis during the next 10000 years (1.50 arcmin in Right Ascension and 1.83 arcmin in declination);

Distance of 45 Orionis from the Sun and relative movement

45 Orionis is distant 370.45 light years from the Sun and it is moving towards the Sun at the speed of 9 kilometers per second.

113.64 pc
370.45 ly
-9 km/s
0.009 arcsec/year
0.011 arcsec/year

Spectral properties of 45 Orionis

45 Orionis belongs to spectral class F0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where 45 Orionis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 45 Orionis. Attribution: Richard Powell / CC BY-SA

45 Orionis star system properties

45 Orionis is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the 45 Orionis double sysyem:

19.1 arcsec

Alternative designations of 45 Orionis