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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: 7:44  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
sleep NighttimeWhat's Visible Now?
All Constellations » Serpens » 

39 Serpentis

Altitude: -25.3°   Azimuth: 357.3°   Direction: North

39 Serpentis is a variable and double hypergiant star in the constellation of Serpens.

39 Serpentis visual magnitude is 6.1. Because of its reltive faintness, 39 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 39 Serpentis:


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

Altitude: -25.3°
Azimuth: 357.3°
Direction: North

Celestial coordinates and finder chart of 39 Serpentis

39 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 39 Serpentis are provided in the following table:

15h 53m 12s
+13° 11’ 48”

The simplified sky map below shows the position of 39 Serpentis in the sky:

Finder chart 39 Serpentis star
Simplified finder chart for 39 Serpentis.

Visibility of 39 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 39 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: 76.8°
Max altitude: 51.7°
Azimuth: 283.2°

Digitized Sky Survey image of 39 Serpentis

The image below is a photograph of 39 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 39 Serpentis is -0.151 arcsec per year in Right Ascension and -0.561 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 39 Serpentis star
DSS2 image of 39 Serpentis. The red arrow shows the motion of 39 Serpentis during the next 1000 years (-2.52 arcmin in Right Ascension and -9.35 arcmin in declination);

Distance of 39 Serpentis from the Sun and relative movement

39 Serpentis is distant 56.92 light years from the Sun and it is moving far from the Sun at the speed of 36 kilometers per second.

17.46 pc
56.92 ly
36 km/s
-0.151 arcsec/year
-0.561 arcsec/year

Spectral properties of 39 Serpentis

39 Serpentis belongs to spectral class G0 and has a luminosity class of V corresponding to a hypergiant star.


The red dot in the diagram below shows where 39 Serpentis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 39 Serpentis. Attribution: Richard Powell / CC BY-SA

39 Serpentis star system properties

39 Serpentis 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 39 Serpentis double sysyem:

98.3 arcsec

Alternative designations of 39 Serpentis

39 Serpentis