HR789

Below the horizon. Never rises today

Alt: -56.83° Az: 265.90° Direction: West

HR789 is a double main-sequence star of spectral class A2 in the constellation of Eridanus.

HR789 visual magnitude is 4.75. Because of its moderate brightness, HR789 is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

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);

Celestial Coordinates

Apparent

Right Ascension 02h 40m 44s

Declination -42° 47’ 10”

Hour Angle 08h 47m 50s

Sideral Time 11h 28m 35s

J2000

Right Ascension 02h 39m 47s

Declination -42° 53’ 30”

Galactic Coordinates

Galactic Longitude 255.67°

Galactic Latitude -62.98°

Finder Chart

Simplified finder chart for HR789.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.75

Class Main-sequence

Absolute magnitude 1.75

Spectral Type A2V

Color Index (B-V) 0.06

Temperature 9434K

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

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

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:

Main star magnitude 4.75

Secondary star magnitude 14.75

Magnitude difference 10

Separation 23.8 arcsec

Distance, Radial Speed, Proper Motion

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.

Distance (parsec) 39.76

Distance (light year) 129.62

Radial Speed 18 km/s

Proper Motion RA 0.106 arcsec/y

Proper Motion Dec -0.027"/y

Alternative Designations

Henry Draper Catalogue HD16754

SAO Catalogue SAO215996

Hipparcos Catalogue HIP12413

Durchmusterung Catalogue CD-43 814

FK5 Catalogue 2185

Visibility from Your Location

HR789 is currently not visible from Greenwich, UK

Set Location

Other stars in Eridanus