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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: 7:40  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
sunny DaytimeWhat's Visible Now?
All Constellations » Leo » 


Altitude: -2.6°   Azimuth: 332.7°   Direction: North-North-West

HR3820 is a variable giant star in the constellation of Leo.

HR3820 visual magnitude is 5.56. Because of its reltive faintness, HR3820 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 HR3820:


HR3820 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -2.6°
Azimuth: 332.7°
Direction: North-North-West

Celestial coordinates and finder chart of HR3820

HR3820 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 HR3820 are provided in the following table:

09h 36m 42s
+31° 09’ 42”

The simplified sky map below shows the position of HR3820 in the sky:

Finder chart HR3820 star
Simplified finder chart for HR3820.

Visibility of HR3820 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 HR3820 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: 58.8°
Max altitude: 69.7°
Azimuth: 301.2°

Digitized Sky Survey image of HR3820

The image below is a photograph of HR3820 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 HR3820 is 0.003 arcsec per year in Right Ascension and -0.039 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3820 star
DSS2 image of HR3820. The red arrow shows the motion of HR3820 during the next 10000 years (0.50 arcmin in Right Ascension and -6.50 arcmin in declination);

Distance of HR3820 from the Sun and relative movement

HR3820 is distant 474.53 light years from the Sun and it is moving towards the Sun at the speed of 20 kilometers per second.

145.56 pc
474.53 ly
-20 km/s
0.003 arcsec/year
-0.039 arcsec/year

Spectral properties of HR3820

HR3820 belongs to spectral class M2 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR3820 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3820. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3820