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: 7:04  
clear_day Transit: 12:47  
SunsetSet: 18:30 south
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All Constellations » Eridanus » 


Altitude: -60.2°   Azimuth: 269.7°   Direction: West

HR789 is a double main-sequence star in the constellation of Eridanus.

HR789 visual magnitude is 4.75. Because of its moderate brightness, HR789 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 HR789:


HR789 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -60.2°
Azimuth: 269.7°
Direction: West

Celestial coordinates and finder chart of HR789

HR789 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 HR789 are provided in the following table:

02h 39m 47s
-42° 53’ 30”

The simplified sky map below shows the position of HR789 in the sky:

Finder chart HR789 star
Simplified finder chart for HR789.

Visibility of HR789 from your location

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

HR789 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR789

The image below is a photograph of HR789 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 HR789 is 0.106 arcsec per year in Right Ascension and -0.027 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR789 star
DSS2 image of HR789. The red arrow shows the motion of HR789 during the next 1000 years (1.77 arcmin in Right Ascension and -0.45 arcmin in declination);

Distance of HR789 from the Sun and relative movement

HR789 is distant 129.62 light years from the Sun and it is moving far from the Sun at the speed of 18 kilometers per second.

39.76 pc
129.62 ly
18 km/s
0.106 arcsec/year
-0.027 arcsec/year

Spectral properties of HR789

HR789 belongs to spectral class A2 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR789 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR789. Attribution: Richard Powell / CC BY-SA

HR789 star system properties

HR789 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 HR789 double sysyem:

23.8 arcsec

Alternative designations of HR789