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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:02 
Transit: 12:56 
Sunset: 20:51
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All Constellations » Serpens » 

τ1 Serpentis (tau1 Serpentis)

Below the horizon.  Rise: 17:13 | Tran: 0:31 | Set: 7:53
Alt: -21.90°   Az: 344.31°   Direction: North-North-West

τ1 Serpentis is a variable giant star of spectral class M1 in the constellation of Serpens.

τ1 Serpentis visual magnitude is 5.17. Because of its faintness, τ1 Serpentis is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

Image of τ1 Serpentis (tau1 Serpentis) star
DSS2 image of τ1 Serpentis. The red arrow shows the motion of τ1 Serpentis during the next 10000 years (-2.17 arcmin in Right Ascension and -1.17 arcmin in declination);

Celestial Coordinates

Apparent

15h 26m 58s
+15° 20’ 24”
10h 59m 40s
02h 26m 38s

J2000

15h 25m 47s
+15° 25’ 41”

Galactic Coordinates

22.86°
52.36°

Finder Chart

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Finder chart for τ1 Serpentis (tau1 Serpentis).

Magnitude, Color, Spectral Class

5.17
Giant

-2.08
M1III
3568K

The red dot in the diagram below shows where τ1 Serpentis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of τ1 Serpentis. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

τ1 Serpentis is distant 918.31 light years from the Sun and it is moving towards the Sun at the speed of 20 kilometers per second.

281.69
918.31
-20 km/s
-0.013 arcsec/y
-0.007"/y

Alternative Designations

τ1 Serpentis
(tau1 Serpentis)
9 Serpentis
SAO101545
SAO101545

Visibility from Your Location

Today's τ1 Serpentis (tau1 Serpentis) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 74.7°
Max altitude: 53.9°
Azimuth: 285.3°