Your guide to the Solar System and the night sky
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🌎  Observing from: Greenwich, United Kingdom [change]
🌅 Sunrise: 6:48  ☀️ Transit: 13:04  🌅 Sunset: 19:21

μ Arietis (mu Arietis)

μ Arietis is a multiple hypergiant star in the constellation of Aries.

μ Arietis visual magnitude is 5.69. Because of its reltive faintness, μ Arietis 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 μ Arietis:

μ Arietis (mu Arietis) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 30°.

Celestial coordinates and finder chart of μ Arietis

μ Arietis 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 μ Arietis are provided in the following table:

02h 42m 21s
+20° 00’ 42”

The simplified sky map below shows the position of μ Arietis in the sky:

Finder chart μ Arietis (mu Arietis) star
Simplified finder chart for μ Arietis (mu Arietis).

Visibility of μ Arietis from your location

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

Today's μ Arietis (mu Arietis) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 70.0°
Max altitude: 58.5°
Azimuth: 290.0°
μ Arietis (mu Arietis) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of μ Arietis

The image below is a photograph of μ Arietis 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 μ Arietis is 0.029 arcsec per year in Right Ascension and -0.043 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of μ Arietis (mu Arietis) star
DSS2 image of μ Arietis. The red arrow shows the motion of μ Arietis during the next 10000 years (4.83 arcmin in Right Ascension and -7.17 arcmin in declination);

Distance of μ Arietis from the Sun and relative movement

μ Arietis is distant 338.17 light years from the Sun and it is moving towards the Sun at the speed of 7 kilometers per second.

103.73 pc
338.17 ly
-7 km/s
0.029 arcsec/year
-0.043 arcsec/year

Spectral properties of μ Arietis

μ Arietis belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.


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

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

μ Arietis star system properties

μ Arietis is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the μ Arietis double sysyem:

0.1 arcsec

Alternative designations of μ Arietis

μ Arietis
(mu Arietis)