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: 6:47  
clear_day Transit: 12:50  
SunsetSet: 18:52 south
sunny DaytimeWhat's Visible Now
All Constellations » Leo » 


Altitude: 56.0°   Azimuth: 189.0°   Direction: South

HR4028 is a double sub-giant star in the constellation of Leo.

HR4028 visual magnitude is 6.55. Because of its reltive faintness, HR4028 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 HR4028:


HR4028 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 56.0°
Azimuth: 189.0°
Direction: South

Celestial coordinates and finder chart of HR4028

HR4028 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 HR4028 are provided in the following table:

10h 16m 16s
+17° 44’ 25”

The simplified sky map below shows the position of HR4028 in the sky:

Finder chart HR4028 star
Simplified finder chart for HR4028.

Visibility of HR4028 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 HR4028 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: 72.3°
Max altitude: 56.3°
Azimuth: 287.7°

Digitized Sky Survey image of HR4028

The image below is a photograph of HR4028 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 HR4028 is -0.006 arcsec per year in Right Ascension and 0.001 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of HR4028 star
DSS2 image of HR4028. The red arrow shows the motion of HR4028 during the next 100000 years (-10.00 arcmin in Right Ascension and 1.67 arcmin in declination);

Distance of HR4028 from the Sun and relative movement

HR4028 is distant 343.16 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

105.26 pc
343.16 ly
-8 km/s
-0.006 arcsec/year
0.001 arcsec/year

Spectral properties of HR4028

HR4028 belongs to spectral class A9 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where HR4028 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4028. Attribution: Richard Powell / CC BY-SA

HR4028 star system properties

HR4028 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR4028 double sysyem:

1.1 arcsec

Alternative designations of HR4028