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 » Draco » 


Altitude: 48.7°   Azimuth: 345.8°   Direction: North-North-West

HR4121 is a giant star in the constellation of Draco.

HR4121 visual magnitude is 6.52. Because of its reltive faintness, HR4121 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 HR4121:


HR4121 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 48.7°
Azimuth: 345.8°
Direction: North-North-West

Celestial coordinates and finder chart of HR4121

HR4121 is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR4121 are provided in the following table:

10h 36m 01s
+80° 29’ 39”

The simplified sky map below shows the position of HR4121 in the sky:

Finder chart HR4121 star
Simplified finder chart for HR4121.

Visibility of HR4121 from your location

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

HR4121 is circumpolar and transits at 10:24 UTC (altitude: 61.0°)

Digitized Sky Survey image of HR4121

The image below is a photograph of HR4121 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 HR4121 is -0.027 arcsec per year in Right Ascension and -0.006 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4121 star
DSS2 image of HR4121. The red arrow shows the motion of HR4121 during the next 10000 years (-4.50 arcmin in Right Ascension and -1.00 arcmin in declination);

Distance of HR4121 from the Sun and relative movement

HR4121 is distant 427.82 light years from the Sun and it is moving towards the Sun at the speed of 11 kilometers per second.

131.23 pc
427.82 ly
-11 km/s
-0.027 arcsec/year
-0.006 arcsec/year

Spectral properties of HR4121

HR4121 belongs to spectral class G4


The red dot in the diagram below shows where HR4121 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4121. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4121