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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
sleep NighttimeWhat's Visible Now?
All Constellations » Orion » 


Altitude: 39.4°   Azimuth: 169.6°   Direction: South

HR1820 is a main-sequence star in the constellation of Orion.

HR1820 visual magnitude is 6.41. Because of its reltive faintness, HR1820 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 HR1820:


HR1820 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 39.4°
Azimuth: 169.6°
Direction: South

Celestial coordinates and finder chart of HR1820

HR1820 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 HR1820 are provided in the following table:

05h 28m 01s
+01° 17’ 53”

The simplified sky map below shows the position of HR1820 in the sky:

Finder chart HR1820 star
Simplified finder chart for HR1820.

Visibility of HR1820 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 HR1820 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: 88.7°
Max altitude: 39.8°
Azimuth: 271.3°

Digitized Sky Survey image of HR1820

The image below is a photograph of HR1820 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 HR1820 is 0.018 arcsec per year in Right Ascension and 0.003 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR1820 star
DSS2 image of HR1820. The red arrow shows the motion of HR1820 during the next 10000 years (3.00 arcmin in Right Ascension and 0.50 arcmin in declination);

Distance of HR1820 from the Sun and relative movement

HR1820 is distant 1,160.14 light years from the Sun and it is moving far from the Sun at the speed of 34 kilometers per second.

355.87 pc
1,160.14 ly
34 km/s
0.018 arcsec/year
0.003 arcsec/year

Spectral properties of HR1820

HR1820 belongs to spectral class B2 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR1820 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR1820. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR1820