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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:59  
clear_day Transit: 12:48  
SunsetSet: 18:36 south
sunny DaytimeWhat's Visible Now
All Constellations » Serpens » 

τ3 Serpentis (tau3 Serpentis)

Altitude: 49.8°   Azimuth: 137.0°   Direction: South-East

τ3 Serpentis is a giant star in the constellation of Serpens.

τ3 Serpentis visual magnitude is 6.12. Because of its reltive faintness, τ3 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 τ3 Serpentis:


τ3 Serpentis (tau3 Serpentis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 49.8°
Azimuth: 137.0°
Direction: South-East

Celestial coordinates and finder chart of τ3 Serpentis

τ3 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 τ3 Serpentis are provided in the following table:

15h 35m 33s
+17° 39’ 20”

The simplified sky map below shows the position of τ3 Serpentis in the sky:

Finder chart τ3 Serpentis (tau3 Serpentis) star
Simplified finder chart for τ3 Serpentis (tau3 Serpentis).

Visibility of τ3 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 τ3 Serpentis (tau3 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: 72.3°
Max altitude: 56.2°
Azimuth: 287.7°

Digitized Sky Survey image of τ3 Serpentis

The image below is a photograph of τ3 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 τ3 Serpentis is -0.079 arcsec per year in Right Ascension and -0.014 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of τ3 Serpentis (tau3 Serpentis) star
DSS2 image of τ3 Serpentis. The red arrow shows the motion of τ3 Serpentis during the next 10000 years (-13.17 arcmin in Right Ascension and -2.33 arcmin in declination);

Distance of τ3 Serpentis from the Sun and relative movement

τ3 Serpentis is distant 414.23 light years from the Sun and it is moving towards the Sun at the speed of 22 kilometers per second.

127.06 pc
414.23 ly
-22 km/s
-0.079 arcsec/year
-0.014 arcsec/year

Spectral properties of τ3 Serpentis

τ3 Serpentis belongs to spectral class G8


The red dot in the diagram below shows where τ3 Serpentis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of τ3 Serpentis. Attribution: Richard Powell / CC BY-SA

Alternative designations of τ3 Serpentis

τ3 Serpentis
(tau3 Serpentis)
15 Serpentis