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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: 7:52  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sunny DaytimeWhat's Visible Now?
All Constellations » Piscis Austrinus » 


Altitude: -23.8°   Azimuth: 111.3°   Direction: East-South-East

HR8721 is a variable main-sequence star in the constellation of Piscis Austrinus.

HR8721 visual magnitude is 6.48. Because of its reltive faintness, HR8721 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 HR8721:


HR8721 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -23.8°
Azimuth: 111.3°
Direction: East-South-East

Celestial coordinates and finder chart of HR8721

HR8721 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 HR8721 are provided in the following table:

22h 56m 24s
-31° 33’ 56”
Piscis Austrinus

The simplified sky map below shows the position of HR8721 in the sky:

Finder chart HR8721 star
Simplified finder chart for HR8721.

Visibility of HR8721 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 HR8721 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: 121.6°
Max altitude: 7.0°
Azimuth: 238.4°

Digitized Sky Survey image of HR8721

The image below is a photograph of HR8721 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 HR8721 is 0.327 arcsec per year in Right Ascension and -0.162 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR8721 star
DSS2 image of HR8721. The red arrow shows the motion of HR8721 during the next 1000 years (5.45 arcmin in Right Ascension and -2.70 arcmin in declination);

Distance of HR8721 from the Sun and relative movement

HR8721 is distant 24.90 light years from the Sun and it is moving far from the Sun at the speed of 6 kilometers per second.

7.64 pc
24.90 ly
6 km/s
0.327 arcsec/year
-0.162 arcsec/year

Spectral properties of HR8721

HR8721 belongs to spectral class K4 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR8721 is situated in the HertzsprungÔÇôRussell diagram.

HR Diagram
H-R diagram showing the position of HR8721. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR8721