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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: 7:43  
clear_day Transit: 11:47  
SunsetSet: 15:52 south
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All Constellations » Scorpius » 

Paikauhale - τ Scorpii (tau Scorpii)

Altitude: 10.1°   Azimuth: 185.3°   Direction: South

Paikauhale, also designated as τ Scorpii (tau Scorpii), is a hypergiant star in the constellation of Scorpius.

Paikauhale visual magnitude is 2.82. Thanks to its high brightness, Paikauhale is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.

The table below summarizes the key facts about Paikauhale:


Paikauhale - τ Scorpii (tau Scorpii) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 10.1°
Azimuth: 185.3°
Direction: South

Celestial coordinates and finder chart of Paikauhale

Paikauhale 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 Paikauhale are provided in the following table:

16h 35m 53s
-28° 12’ 57”

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

Finder chart Paikauhale - τ Scorpii (tau Scorpii) star
Simplified finder chart for Paikauhale - τ Scorpii (tau Scorpii).

Visibility of Paikauhale from your location

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

Today's Paikauhale - τ Scorpii (tau Scorpii) rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 118.2°
Max altitude: 10.3°
Azimuth: 241.8°

Digitized Sky Survey image of Paikauhale

The image below is a photograph of Paikauhale 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 Paikauhale is -0.008 arcsec per year in Right Ascension and -0.022 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Paikauhale - τ Scorpii (tau Scorpii) star
DSS2 image of Paikauhale. The red arrow shows the motion of Paikauhale during the next 10000 years (-1.33 arcmin in Right Ascension and -3.67 arcmin in declination);

Distance of Paikauhale from the Sun and relative movement

Paikauhale is distant 429.51 light years from the Sun and it is moving far from the Sun at the speed of 2 kilometers per second.

131.75 pc
429.51 ly
2 km/s
-0.008 arcsec/year
-0.022 arcsec/year

Spectral properties of Paikauhale

Paikauhale belongs to spectral class B0 and has a luminosity class of V corresponding to a hypergiant star.


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

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

Alternative designations of Paikauhale

τ Scorpii
(tau Scorpii)