Your Guide to the Solar System and the Night Sky
Donate now! You'll help cover server costs, enhance the site and keep it ad-free.
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:44  
clear_day Transit: 12:57  
SunsetSet: 21:11 south
wb_twilight Nautical TwilightWhat's Visible Now
All Constellations » Monoceros » 

18 Monocerotis

Altitude: -18.1°   Azimuth: 298.8°   Direction: West-North-West

18 Monocerotis is a hypergiant star in the constellation of Monoceros.

18 Monocerotis visual magnitude is 4.47. Because of its moderate brightness, 18 Monocerotis 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 18 Monocerotis:


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

Altitude: -18.1°
Azimuth: 298.8°
Direction: West-North-West

Celestial coordinates and finder chart of 18 Monocerotis

18 Monocerotis 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 Monocerotis are provided in the following table:

06h 47m 51s
+02° 24’ 43”

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

Finder chart 18 Monocerotis star
Simplified finder chart for 18 Monocerotis.

Visibility of 18 Monocerotis 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 Monocerotis 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: 87.6°
Max altitude: 40.9°
Azimuth: 272.4°
18 Monocerotis is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 18 Monocerotis

The image below is a photograph of 18 Monocerotis 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 Monocerotis is -0.018 arcsec per year in Right Ascension and -0.012 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 18 Monocerotis star
DSS2 image of 18 Monocerotis. The red arrow shows the motion of 18 Monocerotis during the next 10000 years (-3.00 arcmin in Right Ascension and -2.00 arcmin in declination);

Distance of 18 Monocerotis from the Sun and relative movement

18 Monocerotis is distant 373.00 light years from the Sun and it is moving far from the Sun at the speed of 11 kilometers per second.

114.42 pc
373.00 ly
11 km/s
-0.018 arcsec/year
-0.012 arcsec/year

Spectral properties of 18 Monocerotis

18 Monocerotis belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where 18 Monocerotis is situated in the Hertzsprungā€“Russell diagram.

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

Alternative designations of 18 Monocerotis

18 Monocerotis