18 Orionis

Altitude: -25.5° Azimuth: 341.6° Direction: North-North-West

18 Orionis is a hypergiant star in the constellation of Orion.

18 Orionis visual magnitude is 5.56. Because of its reltive faintness, 18 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 18 Orionis:

Color of 18 Orionis ⬤

Magnitude of 18 Orionis 5.56

Class Hypergiant

VISIBILITY RIGHT NOW

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

Altitude: -25.5°
Azimuth: 341.6°
Direction: North-North-West

Celestial coordinates and finder chart of 18 Orionis

18 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 18 Orionis are provided in the following table:

Right Ascension J2000 05h 16m 04s

Declination J2000 +11° 20’ 29”

Galactic Longitude 191.3°

Galactic Latitude -15.25°

Constellation Orion

The simplified sky map below shows the position of 18 Orionis in the sky:

Simplified finder chart for 18 Orionis.

Visibility of 18 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 18 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: 78.7° RISE 17:02

Max altitude: 49.9° TRANSIT 0:02

Azimuth: 281.3° SET 6:58

Digitized Sky Survey image of 18 Orionis

The image below is a photograph of 18 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 18 Orionis is -0.009 arcsec per year in Right Ascension and -0.005 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

DSS2 image of 18 Orionis. The red arrow shows the motion of 18 Orionis during the next 100000 years (-15.00 arcmin in Right Ascension and -8.33 arcmin in declination);

Distance of 18 Orionis from the Sun and relative movement

18 Orionis is distant 367.95 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

Distance (parsec) 112.87 pc

Distance (light year) 367.95 ly

Heliocentric radial velocity -8 km/s

Proper Motion RA -0.009 arcsec/year

Proper Motion Dec -0.005 arcsec/year

Spectral properties of 18 Orionis

18 Orionis belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.

Absolute magnitude 0.30

Spectral Type A0V

Color Index (B-V) -0.04

Temperature of 18 Orionis 10653K

The red dot in the diagram below shows where 18 Orionis is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 18 Orionis. Attribution: Richard Powell / CC BY-SA

Alternative designations of 18 Orionis

Flamsteed designation 18 Orionis

Henry Draper Catalogue HD34203

SAO Catalogue SAO94426

Hipparcos Catalogue HIP24555

Durchmusterung Catalogue BD+11 756

FK5 Catalogue 2395

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In Evidence

Other stars in Orion