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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: 7:41  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
sleep NighttimeWhat's Visible Now?
All Constellations » Serpens » 

10 Serpentis

Altitude: -2.9°   Azimuth: 83.4°   Direction: East

10 Serpentis is a sub-giant star in the constellation of Serpens.

10 Serpentis visual magnitude is 5.17. Because of its reltive faintness, 10 Serpentis 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 10 Serpentis:


10 Serpentis is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -2.9°
Azimuth: 83.4°
Direction: East

Celestial coordinates and finder chart of 10 Serpentis

10 Serpentis 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 10 Serpentis are provided in the following table:

15h 28m 38s
+01° 50’ 31”

The simplified sky map below shows the position of 10 Serpentis in the sky:

Finder chart 10 Serpentis star
Simplified finder chart for 10 Serpentis.

Visibility of 10 Serpentis 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 10 Serpentis 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: 88.2°
Max altitude: 40.4°
Azimuth: 271.8°

Digitized Sky Survey image of 10 Serpentis

The image below is a photograph of 10 Serpentis 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 10 Serpentis is -0.083 arcsec per year in Right Ascension and -0.029 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 10 Serpentis star
DSS2 image of 10 Serpentis. The red arrow shows the motion of 10 Serpentis during the next 10000 years (-13.83 arcmin in Right Ascension and -4.83 arcmin in declination);

Distance of 10 Serpentis from the Sun and relative movement

10 Serpentis is distant 122.19 light years from the Sun and it is moving towards the Sun at the speed of 10 kilometers per second.

37.48 pc
122.19 ly
-10 km/s
-0.083 arcsec/year
-0.029 arcsec/year

Spectral properties of 10 Serpentis

10 Serpentis belongs to spectral class A8 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where 10 Serpentis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 10 Serpentis. Attribution: Richard Powell / CC BY-SA

Alternative designations of 10 Serpentis

10 Serpentis