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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: 7:48  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
sunny DaytimeWhat's Visible Now?
All Constellations » Serpens » 

τ2 Serpentis (tau2 Serpentis)

Altitude: 22.6°   Azimuth: 267.6°   Direction: West

τ2 Serpentis is a main-sequence star in the constellation of Serpens.

τ2 Serpentis visual magnitude is 6.22. Because of its reltive faintness, τ2 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 τ2 Serpentis:


τ2 Serpentis (tau2 Serpentis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 22.6°
Azimuth: 267.6°
Direction: West

Celestial coordinates and finder chart of τ2 Serpentis

τ2 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 τ2 Serpentis are provided in the following table:

15h 32m 09s
+16° 03’ 21”

The simplified sky map below shows the position of τ2 Serpentis in the sky:

Finder chart τ2 Serpentis (tau2 Serpentis) star
Simplified finder chart for τ2 Serpentis (tau2 Serpentis).

Visibility of τ2 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 τ2 Serpentis (tau2 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: 73.9°
Max altitude: 54.6°
Azimuth: 286.1°

Digitized Sky Survey image of τ2 Serpentis

The image below is a photograph of τ2 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 τ2 Serpentis is 0.001 arcsec per year in Right Ascension and 0.009 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of τ2 Serpentis (tau2 Serpentis) star
DSS2 image of τ2 Serpentis. The red arrow shows the motion of τ2 Serpentis during the next 100000 years (1.67 arcmin in Right Ascension and 15.00 arcmin in declination);

Distance of τ2 Serpentis from the Sun and relative movement

τ2 Serpentis is distant 431.22 light years from the Sun and it is moving towards the Sun at the speed of 18 kilometers per second.

132.28 pc
431.22 ly
-18 km/s
0.001 arcsec/year
0.009 arcsec/year

Spectral properties of τ2 Serpentis

τ2 Serpentis belongs to spectral class B9 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where τ2 Serpentis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of τ2 Serpentis. Attribution: Richard Powell / CC BY-SA

Alternative designations of τ2 Serpentis

τ2 Serpentis
(tau2 Serpentis)
12 Serpentis