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: 6:46  
clear_day Transit: 12:51  
SunsetSet: 18:55 south
wb_twilight Civil TwilightWhat's Visible Now
All Constellations » Carina » 


Altitude: -40.4°   Azimuth: 161.4°   Direction: South-South-East

HR3821 is a giant star in the constellation of Carina.

HR3821 visual magnitude is 5.47. Because of its reltive faintness, HR3821 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 HR3821:


HR3821 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -40.4°
Azimuth: 161.4°
Direction: South-South-East

Celestial coordinates and finder chart of HR3821

HR3821 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 HR3821 are provided in the following table:

09h 31m 36s
-73° 04’ 50”

The simplified sky map below shows the position of HR3821 in the sky:

Finder chart HR3821 star
Simplified finder chart for HR3821.

Visibility of HR3821 from your location

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

HR3821 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR3821

The image below is a photograph of HR3821 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 HR3821 is -0.027 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 HR3821 star
DSS2 image of HR3821. The red arrow shows the motion of HR3821 during the next 10000 years (-4.50 arcmin in Right Ascension and 0.17 arcmin in declination);

Distance of HR3821 from the Sun and relative movement

HR3821 is distant 791.26 light years from the Sun and it is moving far from the Sun at the speed of 14 kilometers per second.

242.72 pc
791.26 ly
14 km/s
-0.027 arcsec/year
0.001 arcsec/year

Spectral properties of HR3821

HR3821 belongs to spectral class K4 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR3821 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3821. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3821