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

Right Ascension 15h 26m 58s

Declination +15° 20’ 24”

Hour Angle 10h 59m 40s

Sidereal Time 02h 26m 38s

J2000

Right Ascension 15h 25m 47s

Declination +15° 25’ 41”

Galactic Coordinates

Galactic Longitude 22.86°

Galactic Latitude 52.36°

Finder Chart

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Finder chart for τ1 Serpentis (tau1 Serpentis).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.17

Class Giant

Absolute magnitude -2.08

Spectral Type M1III

Color Index (B-V) 1.66

Temperature 3568K

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

Distance (parsec) 281.69

Distance (light year) 918.31

Radial Speed -20 km/s

Proper Motion RA -0.013 arcsec/y

Proper Motion Dec -0.007"/y

Alternative Designations

Bayer designation τ1 Serpentis
(tau1 Serpentis)

Flamsteed designation 9 Serpentis

Henry Draper Catalogue HD137471

SAO Catalogue SAO101545

Hipparcos Catalogue HIP75530

Durchmusterung Catalogue BD+15 2858

FK5 Catalogue 570

General Catalogue of Variable Stars 7074

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° RISE 17:13

Max altitude: 53.9° TRANSIT 0:31

Azimuth: 285.3° SET 7:53

Set Location

Other stars in Serpens