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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: 7:47  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
sunny DaytimeWhat's Visible Now?
All Constellations » Monoceros » 


Altitude: -21.6°   Azimuth: 318.5°   Direction: North-West

HR2551 is a hypergiant star in the constellation of Monoceros.

HR2551 visual magnitude is 5.77. Because of its reltive faintness, HR2551 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 HR2551:


HR2551 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -21.6°
Azimuth: 318.5°
Direction: North-West

Celestial coordinates and finder chart of HR2551

HR2551 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 HR2551 are provided in the following table:

06h 52m 49s
+08° 22’ 49”

The simplified sky map below shows the position of HR2551 in the sky:

Finder chart HR2551 star
Simplified finder chart for HR2551.

Visibility of HR2551 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 HR2551 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: 81.6°
Max altitude: 46.9°
Azimuth: 278.4°

Digitized Sky Survey image of HR2551

The image below is a photograph of HR2551 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 HR2551 is -0.05 arcsec per year in Right Ascension and -0.032 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR2551 star
DSS2 image of HR2551. The red arrow shows the motion of HR2551 during the next 10000 years (-8.33 arcmin in Right Ascension and -5.33 arcmin in declination);

Distance of HR2551 from the Sun and relative movement

HR2551 is distant 204.01 light years from the Sun and it is moving far from the Sun at the speed of 27 kilometers per second.

62.58 pc
204.01 ly
27 km/s
-0.05 arcsec/year
-0.032 arcsec/year

Spectral properties of HR2551

HR2551 belongs to spectral class F0 and has a luminosity class of V corresponding to a hypergiant star.


The red dot in the diagram below shows where HR2551 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR2551. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR2551