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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
north SunriseRise: 7:54  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sleep NighttimeWhat's Visible Now?
All Constellations » Draco » 


Altitude: 24.4°   Azimuth: 1.4°   Direction: North

HR6421 is a hypergiant star in the constellation of Draco.

HR6421 visual magnitude is 5.56. Because of its reltive faintness, HR6421 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 HR6421:


HR6421 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 24.4°
Azimuth: 1.4°
Direction: North

Celestial coordinates and finder chart of HR6421

HR6421 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 HR6421 are provided in the following table:

17h 12m 32s
+62° 52’ 27”

The simplified sky map below shows the position of HR6421 in the sky:

Finder chart HR6421 star
Simplified finder chart for HR6421.

Visibility of HR6421 from your location

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

HR6421 is circumpolar and transits at 11:52 UTC (altitude: 78.6°)

Digitized Sky Survey image of HR6421

The image below is a photograph of HR6421 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 HR6421 is 0.014 arcsec per year in Right Ascension and 0.048 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR6421 star
DSS2 image of HR6421. The red arrow shows the motion of HR6421 during the next 10000 years (2.33 arcmin in Right Ascension and 8.00 arcmin in declination);

Distance of HR6421 from the Sun and relative movement

HR6421 is distant 135.78 light years from the Sun and it is moving towards the Sun at the speed of 5 kilometers per second.

41.65 pc
135.78 ly
-5 km/s
0.014 arcsec/year
0.048 arcsec/year

Spectral properties of HR6421

HR6421 belongs to spectral class F0 and has a luminosity class of IV corresponding to a hypergiant star.


The red dot in the diagram below shows where HR6421 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR6421. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR6421