45 Orionis

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:

Color of 45 Orionis ⬤

Magnitude of 45 Orionis 5.26

Class Hypergiant

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

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:

Right Ascension J2000 05h 35m 39s

Declination J2000 -04° 51’ 20”

Galactic Longitude 208.55°

Galactic Latitude -19.06°

Constellation Orion

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

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° RISE 8:19

Max altitude: 33.7° TRANSIT 13:52

Azimuth: 265.1° SET 19:26

RIGHT NOW 45 Orionis is below the horizon from Greenwich, United Kingdom

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.

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.

Distance (parsec) 113.64 pc

Distance (light year) 370.45 ly

Heliocentric radial velocity -9 km/s

Proper Motion RA 0.009 arcsec/year

Proper Motion Dec 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.

Absolute magnitude -0.02

Spectral Type F0III

Color Index (B-V) 0.24

Temperature of 45 Orionis 7866K

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

Main star magnitude 5.26

Secondary star magnitude 14.26

Magnitude difference 9

Separation 19.1 arcsec

Alternative designations of 45 Orionis

Flamsteed designation 45 Orionis

Henry Draper Catalogue HD37077

SAO Catalogue SAO132336

Hipparcos Catalogue HIP26268

Durchmusterung Catalogue BD-04 1188

Aitken Double Star Catalogue ADS4196

In Evidence

Other stars in Orion