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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: 7:47  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
sleep NighttimeWhat's Visible Now?
All Constellations » Pegasus » 


Altitude: -9.1°   Azimuth: 314.5°   Direction: North-West

HR8221 is a variable star in the constellation of Pegasus.

HR8221 visual magnitude is 6.44. Because of its reltive faintness, HR8221 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 HR8221:


HR8221 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -9.1°
Azimuth: 314.5°
Direction: North-West

Celestial coordinates and finder chart of HR8221

HR8221 is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR8221 are provided in the following table:

21h 28m 59s
+17° 54’ 20”

The simplified sky map below shows the position of HR8221 in the sky:

Finder chart HR8221 star
Simplified finder chart for HR8221.

Visibility of HR8221 from your location

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

Today's HR8221 rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 72.1°
Max altitude: 56.4°
Azimuth: 287.9°

Digitized Sky Survey image of HR8221

The image below is a photograph of HR8221 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 HR8221 is -0.015 arcsec per year in Right Ascension and -0.001 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR8221 star
DSS2 image of HR8221. The red arrow shows the motion of HR8221 during the next 10000 years (-2.50 arcmin in Right Ascension and -0.17 arcmin in declination);

Distance of HR8221 from the Sun and relative movement

HR8221 is distant 544.24 light years from the Sun and it is moving towards the Sun at the speed of 12 kilometers per second.

166.94 pc
544.24 ly
-12 km/s
-0.015 arcsec/year
-0.001 arcsec/year

Spectral properties of HR8221

HR8221 belongs to spectral class K5


The red dot in the diagram below shows where HR8221 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR8221. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR8221