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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: 7:50  
clear_day Transit: 11:50  
SunsetSet: 15:49 south
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All Constellations » Crux » 


Altitude: -53.0°   Azimuth: 235.5°   Direction: South-West

HR4908 is a variable and double supergiant star in the constellation of Crux.

HR4908 visual magnitude is 5.32. Because of its reltive faintness, HR4908 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 HR4908:


HR4908 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -53.0°
Azimuth: 235.5°
Direction: South-West

Celestial coordinates and finder chart of HR4908

HR4908 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 HR4908 are provided in the following table:

12h 55m 56s
-56° 50’ 09”

The simplified sky map below shows the position of HR4908 in the sky:

Finder chart HR4908 star
Simplified finder chart for HR4908.

Visibility of HR4908 from your location

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

HR4908 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR4908

The image below is a photograph of HR4908 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 HR4908 is -0.024 arcsec per year in Right Ascension and -0.01 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4908 star
DSS2 image of HR4908. The red arrow shows the motion of HR4908 during the next 10000 years (-4.00 arcmin in Right Ascension and -1.67 arcmin in declination);

Distance of HR4908 from the Sun and relative movement

HR4908 is distant 1,884.39 light years from the Sun and it is moving far from the Sun at the speed of 18 kilometers per second.

578.03 pc
1,884.39 ly
18 km/s
-0.024 arcsec/year
-0.01 arcsec/year

Spectral properties of HR4908

HR4908 belongs to spectral class O9 and has a luminosity class of I corresponding to a supergiant star.


The red dot in the diagram below shows where HR4908 is situated in the HertzsprungÔÇôRussell diagram.

HR Diagram
H-R diagram showing the position of HR4908. Attribution: Richard Powell / CC BY-SA

HR4908 star system properties

HR4908 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 HR4908 double sysyem:

29.1 arcsec

Alternative designations of HR4908