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: 4:45  
clear_day Transit: 12:57  
SunsetSet: 21:09 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Perseus » 


Altitude: -0.4°   Azimuth: 19.4°   Direction: North-North-East

HR820 is a multiple main-sequence star in the constellation of Perseus.

HR820 visual magnitude is 6.3. Because of its reltive faintness, HR820 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 HR820:


HR820 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -0.4°
Azimuth: 19.4°
Direction: North-North-East

Celestial coordinates and finder chart of HR820

HR820 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR820 are provided in the following table:

02h 47m 03s
+35° 33’ 17”

The simplified sky map below shows the position of HR820 in the sky:

Finder chart HR820 star
Simplified finder chart for HR820.

Visibility of HR820 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 HR820 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: 54.4°
Max altitude: 74.1°
Azimuth: 305.6°
HR820 is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR820

The image below is a photograph of HR820 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 HR820 is -0.043 arcsec per year in Right Ascension and -0.047 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR820 star
DSS2 image of HR820. The red arrow shows the motion of HR820 during the next 10000 years (-7.17 arcmin in Right Ascension and -7.83 arcmin in declination);

Distance of HR820 from the Sun and relative movement

HR820 is distant 153.48 light years from the Sun and it is moving towards the Sun at the speed of 4 kilometers per second.

47.08 pc
153.48 ly
-4 km/s
-0.043 arcsec/year
-0.047 arcsec/year

Spectral properties of HR820

HR820 belongs to spectral class A9 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR820 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR820. Attribution: Richard Powell / CC BY-SA

HR820 star system properties

HR820 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR820 double sysyem:

1.5 arcsec

Alternative designations of HR820