We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
A Complete Guide to the Solar System and the Night Sky
Donate now and help us to keep this site free and ad-free!
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:38  
clear_day Transit: 11:46  
SunsetSet: 15:54 south
sunny DaytimeWhat's Visible Now?
All Constellations » Monoceros » 


Altitude: 5.1°   Azimuth: 282.3°   Direction: West-North-West

HR2378 is a double hypergiant star in the constellation of Monoceros.

HR2378 visual magnitude is 6.03. Because of its reltive faintness, HR2378 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 HR2378:


HR2378 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 5.1°
Azimuth: 282.3°
Direction: West-North-West

Celestial coordinates and finder chart of HR2378

HR2378 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 HR2378 are provided in the following table:

06h 32m 23s
+11° 40’ 24”

The simplified sky map below shows the position of HR2378 in the sky:

Finder chart HR2378 star
Simplified finder chart for HR2378.

Visibility of HR2378 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 HR2378 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: 78.3°
Max altitude: 50.2°
Azimuth: 281.7°

Digitized Sky Survey image of HR2378

The image below is a photograph of HR2378 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 HR2378 is 0.01 arcsec per year in Right Ascension and -0.031 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR2378 star
DSS2 image of HR2378. The red arrow shows the motion of HR2378 during the next 10000 years (1.67 arcmin in Right Ascension and -5.17 arcmin in declination);

Distance of HR2378 from the Sun and relative movement

HR2378 is distant 833.76 light years from the Sun and it is moving towards the Sun at the speed of 21 kilometers per second.

255.75 pc
833.76 ly
-21 km/s
0.01 arcsec/year
-0.031 arcsec/year

Spectral properties of HR2378

HR2378 belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where HR2378 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR2378. Attribution: Richard Powell / CC BY-SA

HR2378 star system properties

HR2378 is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the HR2378 double sysyem:

31.1 arcsec

Alternative designations of HR2378