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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: 6:40  
clear_day Transit: 12:10  
SunsetSet: 17:41
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All Constellations » Crux » 

μ1 Crucis (mu1 Crucis)

Altitude: -45.7°   Azimuth: 130.1°   Direction: South-East

μ1 Crucis is a double sub-giant star in the constellation of Crux.

μ1 Crucis visual magnitude is 4.03. Because of its moderate brightness, μ1 Crucis should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of μ1 Crucis is -0.033 arcsec per year in Right Ascension and -0.006 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of μ1 Crucis (mu1 Crucis) star
DSS2 image of μ1 Crucis. The red arrow shows the motion of μ1 Crucis during the next 10000 years (-5.50 arcmin in Right Ascension and -1.00 arcmin in declination);

Key facts about μ1 Crucis


μ1 Crucis (mu1 Crucis) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -45.7°
Azimuth: 130.1°
Direction: South-East

Celestial coordinates and finder chart of μ1 Crucis

μ1 Crucis 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 μ1 Crucis are provided in the following table:

12h 54m 35s
-57° 10’ 40”

The simplified sky map below shows the position of μ1 Crucis in the sky:

Finder chart μ1 Crucis (mu1 Crucis) star
Simplified finder chart for μ1 Crucis (mu1 Crucis).

Visibility of μ1 Crucis from your location

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

μ1 Crucis (mu1 Crucis) is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of μ1 Crucis from the Sun and relative movement

μ1 Crucis is distant 377.31 light years from the Sun and it is moving far from the Sun at the speed of 14 kilometers per second.

115.74 pc
377.31 ly
14 km/s
-0.033 arcsec/year
-0.006 arcsec/year

Spectral properties of μ1 Crucis

μ1 Crucis belongs to spectral class B2 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where μ1 Crucis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of μ1 Crucis. Attribution: Richard Powell / CC BY-SA

μ1 Crucis star system properties

μ1 Crucis is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the μ1 Crucis double sysyem:

34.9 arcsec

Alternative designations of μ1 Crucis

μ1 Crucis
(mu1 Crucis)