We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
A Complete Guide to the Solar System and the Night Sky
Donate now and help us to keep this site free and ad-free!
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:44  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
sleep NighttimeWhat's Visible Now?
All Constellations » Ursa Major » 


Altitude: -0.5°   Azimuth: 353.0°   Direction: North

HR4550 is a variable and double main-sequence star in the constellation of Ursa Major.

HR4550 visual magnitude is 6.45. Because of its reltive faintness, HR4550 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 HR4550:


HR4550 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -0.5°
Azimuth: 353.0°
Direction: North

Celestial coordinates and finder chart of HR4550

HR4550 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR4550 are provided in the following table:

11h 52m 58s
+37° 43’ 06”
Ursa Major

The simplified sky map below shows the position of HR4550 in the sky:

Finder chart HR4550 star
Simplified finder chart for HR4550.

Visibility of HR4550 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 HR4550 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: 52.3°
Max altitude: 76.2°
Azimuth: 307.7°

Digitized Sky Survey image of HR4550

The image below is a photograph of HR4550 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 HR4550 is 4.003 arcsec per year in Right Ascension and -5.813 arcsec per year in Declination and the associated displacement for the next 100 years is represented with the red arrow.

Image of HR4550 star
DSS2 image of HR4550. The red arrow shows the motion of HR4550 during the next 100 years (6.67 arcmin in Right Ascension and -9.69 arcmin in declination);

Distance of HR4550 from the Sun and relative movement

HR4550 is distant 29.85 light years from the Sun and it is moving towards the Sun at the speed of 98 kilometers per second.

9.16 pc
29.85 ly
-98 km/s
4.003 arcsec/year
-5.813 arcsec/year

Spectral properties of HR4550

HR4550 belongs to spectral class G8 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR4550 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4550. Attribution: Richard Powell / CC BY-SA

HR4550 star system properties

HR4550 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR4550 double sysyem:

1.7 arcsec

Alternative designations of HR4550

Gl 451 A