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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
SunriseRise: 6:50  
clear_day Transit: 12:11  
SunsetSet: 17:32
sleep NighttimeWhat's Visible Now?
All Constellations » Taurus » 

σ1 Tauri (sigma1 Tauri)

Altitude: 4.1°   Azimuth: 290.4°   Direction: West-North-West

σ1 Tauri is a multiple star in the constellation of Taurus.

σ1 Tauri visual magnitude is 5.07. Because of its reltive faintness, σ1 Tauri should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of σ1 Tauri is 0.039 arcsec per year in Right Ascension and -0.072 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of σ1 Tauri (sigma1 Tauri) star
DSS2 image of σ1 Tauri. The red arrow shows the motion of σ1 Tauri during the next 10000 years (6.50 arcmin in Right Ascension and -12.00 arcmin in declination);

Key facts about σ1 Tauri


σ1 Tauri (sigma1 Tauri) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 4.1°
Azimuth: 290.4°
Direction: West-North-West

Celestial coordinates and finder chart of σ1 Tauri

σ1 Tauri 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 σ1 Tauri are provided in the following table:

04h 39m 09s
+15° 47’ 58”

The simplified sky map below shows the position of σ1 Tauri in the sky:

Finder chart σ1 Tauri (sigma1 Tauri) star
Simplified finder chart for σ1 Tauri (sigma1 Tauri).

Visibility of σ1 Tauri 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 σ1 Tauri (sigma1 Tauri) 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: 74.2°
Max altitude: 54.3°
Azimuth: 285.8°

Distance of σ1 Tauri from the Sun and relative movement

σ1 Tauri is distant 151.70 light years from the Sun and it is moving far from the Sun at the speed of 19 kilometers per second.

46.53 pc
151.70 ly
19 km/s
0.039 arcsec/year
-0.072 arcsec/year

Spectral properties of σ1 Tauri

σ1 Tauri belongs to spectral class A4


The red dot in the diagram below shows where σ1 Tauri is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of σ1 Tauri. Attribution: Richard Powell / CC BY-SA

σ1 Tauri star system properties

σ1 Tauri is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the σ1 Tauri double sysyem:

431.2 arcsec

Alternative designations of σ1 Tauri

σ1 Tauri
(sigma1 Tauri)