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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: 6:44  
clear_day Transit: 12:10  
SunsetSet: 17:38
sunny DaytimeWhat's Visible Now?
All Constellations » Auriga » 


Altitude: 55.4°   Azimuth: 66.8°   Direction: East-North-East

HR2123 is a variable and multiple giant star in the constellation of Auriga.

HR2123 visual magnitude is 6.45. Because of its reltive faintness, HR2123 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 HR2123 is 0.005 arcsec per year in Right Ascension and -0.042 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR2123 star
DSS2 image of HR2123. The red arrow shows the motion of HR2123 during the next 10000 years (0.83 arcmin in Right Ascension and -7.00 arcmin in declination);

Key facts about HR2123


HR2123 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 55.4°
Azimuth: 66.8°
Direction: East-North-East

Celestial coordinates and finder chart of HR2123

HR2123 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 HR2123 are provided in the following table:

06h 04m 29s
+51° 34’ 23”

The simplified sky map below shows the position of HR2123 in the sky:

Finder chart HR2123 star
Simplified finder chart for HR2123.

Visibility of HR2123 from your location

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

HR2123 is circumpolar and transits at 19:24 UTC (altitude: 89.9°)

Distance of HR2123 from the Sun and relative movement

HR2123 is distant 393.72 light years from the Sun and it is moving far from the Sun at the speed of 20 kilometers per second.

120.77 pc
393.72 ly
20 km/s
0.005 arcsec/year
-0.042 arcsec/year

Spectral properties of HR2123

HR2123 belongs to spectral class A7 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR2123 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR2123. Attribution: Richard Powell / CC BY-SA

HR2123 star system properties

HR2123 is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the HR2123 double sysyem:

39 arcsec

Alternative designations of HR2123