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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
SunriseRise: 5:43  
clear_day Transit: 12:56  
SunsetSet: 20:10
sunny DaytimeWhat's Visible Now?
All Constellations » Vela » 


Altitude: -78.2°   Azimuth: 73.8°   Direction: East-North-East

HR3904 is a hypergiant star in the constellation of Vela.

HR3904 visual magnitude is 5.73. Because of its reltive faintness, HR3904 should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of HR3904 is -0.034 arcsec per year in Right Ascension and 0.016 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3904 star
DSS2 image of HR3904. The red arrow shows the motion of HR3904 during the next 10000 years (-5.67 arcmin in Right Ascension and 2.67 arcmin in declination);

Key facts about HR3904


HR3904 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -78.2°
Azimuth: 73.8°
Direction: East-North-East

Celestial coordinates and finder chart of HR3904

HR3904 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 HR3904 are provided in the following table:

09h 50m 42s
-46° 56’ 03”

The simplified sky map below shows the position of HR3904 in the sky:

Finder chart HR3904 star
Simplified finder chart for HR3904.

Visibility of HR3904 from your location

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

HR3904 is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of HR3904 from the Sun and relative movement

HR3904 is distant 597.07 light years from the Sun and it is moving far from the Sun at the speed of 17 kilometers per second.

183.15 pc
597.07 ly
17 km/s
-0.034 arcsec/year
0.016 arcsec/year

Spectral properties of HR3904

HR3904 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 HR3904 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR3904. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3904