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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: 5:43  
clear_day Transit: 12:56  
SunsetSet: 20:10
sunny DaytimeWhat's Visible Now?
All Constellations » Vela » 


Altitude: -84.7°   Azimuth: 172.0°   Direction: South

HR4221 is a variable giant star in the constellation of Vela.

HR4221 visual magnitude is 5.23. Because of its reltive faintness, HR4221 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 HR4221 is -0.016 arcsec per year in Right Ascension and -0.002 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4221 star
DSS2 image of HR4221. The red arrow shows the motion of HR4221 during the next 10000 years (-2.67 arcmin in Right Ascension and -0.33 arcmin in declination);

Key facts about HR4221


HR4221 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -84.7°
Azimuth: 172.0°
Direction: South

Celestial coordinates and finder chart of HR4221

HR4221 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 HR4221 are provided in the following table:

10h 46m 57s
-56° 45’ 25”

The simplified sky map below shows the position of HR4221 in the sky:

Finder chart HR4221 star
Simplified finder chart for HR4221.

Visibility of HR4221 from your location

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

HR4221 is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of HR4221 from the Sun and relative movement

HR4221 is distant 547.90 light years from the Sun and it is moving far from the Sun at the speed of 31 kilometers per second.

168.07 pc
547.90 ly
31 km/s
-0.016 arcsec/year
-0.002 arcsec/year

Spectral properties of HR4221

HR4221 belongs to spectral class B8 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR4221 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR4221. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4221