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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
SunriseRise: 5:43  
clear_day Transit: 12:56  
SunsetSet: 20:10
sunny DaytimeWhat's Visible Now?
All Constellations » Vela » 


Altitude: -86.9°   Azimuth: 97.0°   Direction: East

HR4020 is a variable and double sub-giant star in the constellation of Vela.

HR4020 visual magnitude is 5.78. Because of its reltive faintness, HR4020 should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of HR4020 is -0.046 arcsec per year in Right Ascension and 0.004 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4020 star
DSS2 image of HR4020. The red arrow shows the motion of HR4020 during the next 10000 years (-7.67 arcmin in Right Ascension and 0.67 arcmin in declination);

Key facts about HR4020


HR4020 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -86.9°
Azimuth: 97.0°
Direction: East

Celestial coordinates and finder chart of HR4020

HR4020 is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR4020 are provided in the following table:

10h 13m 27s
-51° 45’ 21”

The simplified sky map below shows the position of HR4020 in the sky:

Finder chart HR4020 star
Simplified finder chart for HR4020.

Visibility of HR4020 from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

HR4020 is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of HR4020 from the Sun and relative movement

HR4020 is distant 318.05 light years from the Sun and it is moving far from the Sun at the speed of 18 kilometers per second.

97.56 pc
318.05 ly
18 km/s
-0.046 arcsec/year
0.004 arcsec/year

Spectral properties of HR4020

HR4020 belongs to spectral class A3 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where HR4020 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR4020. Attribution: Richard Powell / CC BY-SA

HR4020 star system properties

HR4020 is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the HR4020 double sysyem:

0.3 arcsec

Alternative designations of HR4020