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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: 7:52  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
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All Constellations » Lupus » 

τ1 Lupi (tau1 Lupi)

Altitude: -70.2°   Azimuth: 277.1°   Direction: West

τ1 Lupi is a variable and double sub-giant star in the constellation of Lupus.

τ1 Lupi visual magnitude is 4.56. Because of its moderate brightness, τ1 Lupi should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about τ1 Lupi:


τ1 Lupi (tau1 Lupi) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -70.2°
Azimuth: 277.1°
Direction: West

Celestial coordinates and finder chart of τ1 Lupi

τ1 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 τ1 Lupi are provided in the following table:

14h 26m 08s
-45° 13’ 17”

The simplified sky map below shows the position of τ1 Lupi in the sky:

Finder chart τ1 Lupi (tau1 Lupi) star
Simplified finder chart for τ1 Lupi (tau1 Lupi).

Visibility of τ1 Lupi from your location

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

τ1 Lupi (tau1 Lupi) is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of τ1 Lupi

The image below is a photograph of τ1 Lupi 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 τ1 Lupi is -0.012 arcsec per year in Right Ascension and -0.013 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of τ1 Lupi (tau1 Lupi) star
DSS2 image of τ1 Lupi. The red arrow shows the motion of τ1 Lupi during the next 10000 years (-2.00 arcmin in Right Ascension and -2.17 arcmin in declination);

Distance of τ1 Lupi from the Sun and relative movement

τ1 Lupi is distant 1,034.92 light years from the Sun and it is moving towards the Sun at the speed of 22 kilometers per second.

317.46 pc
1,034.92 ly
-22 km/s
-0.012 arcsec/year
-0.013 arcsec/year

Spectral properties of τ1 Lupi

τ1 Lupi 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 τ1 Lupi is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of τ1 Lupi. Attribution: Richard Powell / CC BY-SA

τ1 Lupi star system properties

τ1 Lupi 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 τ1 Lupi double sysyem:

158.2 arcsec

Alternative designations of τ1 Lupi

τ1 Lupi
(tau1 Lupi)