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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: 7:51  
clear_day Transit: 11:50  
SunsetSet: 15:49 south
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All Constellations » Sextans » 

40 Sextantis

Altitude: -20.5°   Azimuth: 69.6°   Direction: East-North-East

40 Sextantis is a double sub-giant star in the constellation of Sextans.

40 Sextantis visual magnitude is 6.61. Because of its reltive faintness, 40 Sextantis 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 40 Sextantis:


40 Sextantis is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -20.5°
Azimuth: 69.6°
Direction: East-North-East

Celestial coordinates and finder chart of 40 Sextantis

40 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 40 Sextantis are provided in the following table:

10h 49m 17s
-04° 01’ 27”

The simplified sky map below shows the position of 40 Sextantis in the sky:

Finder chart 40 Sextantis star
Simplified finder chart for 40 Sextantis.

Visibility of 40 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 40 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: 94.0°
Max altitude: 34.5°
Azimuth: 266.0°

Digitized Sky Survey image of 40 Sextantis

The image below is a photograph of 40 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 40 Sextantis is -0.049 arcsec per year in Right Ascension and -0.012 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 40 Sextantis star
DSS2 image of 40 Sextantis. The red arrow shows the motion of 40 Sextantis during the next 10000 years (-8.17 arcmin in Right Ascension and -2.00 arcmin in declination);

Distance of 40 Sextantis from the Sun and relative movement

40 Sextantis is distant 312.56 light years from the Sun and it is moving far from the Sun at the speed of 14 kilometers per second.

95.88 pc
312.56 ly
14 km/s
-0.049 arcsec/year
-0.012 arcsec/year

Spectral properties of 40 Sextantis

40 Sextantis belongs to spectral class A2 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where 40 Sextantis is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of 40 Sextantis. Attribution: Richard Powell / CC BY-SA

40 Sextantis star system properties

40 Sextantis is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the 40 Sextantis double sysyem:

2.2 arcsec

Alternative designations of 40 Sextantis

40 Sextantis