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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: 7:54  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sleep NighttimeWhat's Visible Now?
All Constellations » Sextans » 

α Sextantis (alpha Sextantis)

Altitude: -23.8°   Azimuth: 57.1°   Direction: East-North-East

α Sextantis is a hypergiant star in the constellation of Sextans.

α Sextantis visual magnitude is 4.49. Because of its moderate brightness, α Sextantis 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 α Sextantis:


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

Altitude: -23.8°
Azimuth: 57.1°
Direction: East-North-East

Celestial coordinates and finder chart of α Sextantis

α Sextantis 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 α Sextantis are provided in the following table:

10h 07m 56s
-00° 22’ 18”

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

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

Visibility of α Sextantis 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 α Sextantis (alpha Sextantis) 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: 90.4°
Max altitude: 38.1°
Azimuth: 269.6°

Digitized Sky Survey image of α Sextantis

The image below is a photograph of α Sextantis 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 α Sextantis is -0.016 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 α Sextantis (alpha Sextantis) star
DSS2 image of α Sextantis. The red arrow shows the motion of α Sextantis during the next 10000 years (-2.67 arcmin in Right Ascension and -2.17 arcmin in declination);

Distance of α Sextantis from the Sun and relative movement

α Sextantis is distant 287.22 light years from the Sun and it is moving far from the Sun at the speed of 7 kilometers per second.

88.11 pc
287.22 ly
7 km/s
-0.016 arcsec/year
-0.013 arcsec/year

Spectral properties of α Sextantis

α Sextantis belongs to spectral class A0 and has a luminosity class of III corresponding to a hypergiant star.


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

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

Alternative designations of α Sextantis

α Sextantis
(alpha Sextantis)
15 Sextantis