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: 4:49  
clear_day Transit: 12:56  
SunsetSet: 21:04 south
wb_twilight Nautical TwilightWhat's Visible Now
All Constellations » Monoceros » 

20 Monocerotis

20 Monocerotis is a multiple hypergiant star in the constellation of Monoceros.

20 Monocerotis visual magnitude is 4.92. Because of its moderate brightness, 20 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 20 Monocerotis:

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

Celestial coordinates and finder chart of 20 Monocerotis

20 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 20 Monocerotis are provided in the following table:

07h 10m 13s
-04° 14’ 13”

The simplified sky map below shows the position of 20 Monocerotis in the sky:

Finder chart 20 Monocerotis star
Simplified finder chart for 20 Monocerotis.

Visibility of 20 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 20 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: 94.2°
Max altitude: 34.3°
Azimuth: 265.8°
20 Monocerotis is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 20 Monocerotis

The image below is a photograph of 20 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 20 Monocerotis is 0 arcsec per year in Right Ascension and 0.215 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 20 Monocerotis star
DSS2 image of 20 Monocerotis. The red arrow shows the motion of 20 Monocerotis during the next 1000 years (0.00 arcmin in Right Ascension and 3.58 arcmin in declination);

Distance of 20 Monocerotis from the Sun and relative movement

20 Monocerotis is distant 211.00 light years from the Sun and it is moving far from the Sun at the speed of 79 kilometers per second.

64.72 pc
211.00 ly
79 km/s
0.215 arcsec/year

Spectral properties of 20 Monocerotis

20 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 20 Monocerotis is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of 20 Monocerotis. Attribution: Richard Powell / CC BY-SA

20 Monocerotis star system properties

20 Monocerotis is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the 20 Monocerotis double sysyem:

186.2 arcsec

Alternative designations of 20 Monocerotis

20 Monocerotis