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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: 6:44  
clear_day Transit: 12:10  
SunsetSet: 17:38
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All Constellations » Lupus » 

α Lupi (alpha Lupi)

Altitude: -71.0°   Azimuth: 271.0°   Direction: West

α Lupi is a variable and double giant star in the constellation of Lupus.

α Lupi visual magnitude is 2.3. Thanks to its high brightness, α Lupi is clearly visible when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

The proper motion of α Lupi is -0.021 arcsec per year in Right Ascension and -0.018 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of α Lupi (alpha Lupi) star
DSS2 image of α Lupi. The red arrow shows the motion of α Lupi during the next 10000 years (-3.50 arcmin in Right Ascension and -3.00 arcmin in declination);

Key facts about α Lupi

2.3
Giant

α Lupi (alpha Lupi) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -71.0°
Azimuth: 271.0°
Direction: West

Celestial coordinates and finder chart of α Lupi

α Lupi 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 α Lupi are provided in the following table:

14h 41m 55s
-47° 23’ 17”
321.61°
11.44°
Lupus

The simplified sky map below shows the position of α Lupi in the sky:

Finder chart α Lupi (alpha Lupi) star
Simplified finder chart for α Lupi (alpha Lupi).

Visibility of α Lupi from your location

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

α Lupi (alpha Lupi) is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of α Lupi from the Sun and relative movement

α Lupi is distant 547.90 light years from the Sun and it is moving far from the Sun at the speed of 5 kilometers per second.

168.07 pc
547.90 ly
5 km/s
-0.021 arcsec/year
-0.018 arcsec/year

Spectral properties of α Lupi

α Lupi belongs to spectral class B1 and has a luminosity class of III corresponding to a giant star.

-3.83
B1III
13585K

The red dot in the diagram below shows where α Lupi is situated in the Hertzsprung–Russell diagram.

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

α Lupi star system properties

α Lupi 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 α Lupi double sysyem:

2.3
13.4
11.1
27.6 arcsec

Alternative designations of α Lupi

α Lupi
(alpha Lupi)
SAO225128
SAO225128