σ1 Tauri (sigma1 Tauri)

Altitude: -13.9° Azimuth: 40.4° Direction: North-East

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 skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about σ1 Tauri:

Color of σ1 Tauri ⬤

Magnitude of σ1 Tauri 5.07

Class

VISIBILITY RIGHT NOW

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

Altitude: -13.9°
Azimuth: 40.4°
Direction: North-East

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:

Right Ascension J2000 04h 39m 09s

Declination J2000 +15° 47’ 58”

Galactic Longitude 182.07°

Galactic Latitude -20.07°

Constellation Taurus

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° RISE 5:11

Max altitude: 54.3° TRANSIT 12:32

Azimuth: 285.8° SET 19:53

RIGHT NOW σ1 Tauri (sigma1 Tauri) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of σ1 Tauri

The image below is a photograph of σ1 Tauri 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 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.

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);

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.

Distance (parsec) 46.53 pc

Distance (light year) 151.70 ly

Heliocentric radial velocity 19 km/s

Proper Motion RA 0.039 arcsec/year

Proper Motion Dec -0.072 arcsec/year

Spectral properties of σ1 Tauri

σ1 Tauri belongs to spectral class A4

Absolute magnitude 1.73

Spectral Type A4

Color Index (B-V) 0.15

Temperature of σ1 Tauri 8571K

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

Main star magnitude 5.07

Secondary star magnitude 5.47

Magnitude difference 0.4

Separation 431.2 arcsec

Alternative designations of σ1 Tauri

Bayer designation σ1 Tauri
(sigma1 Tauri)

Flamsteed designation 91 Tauri

Henry Draper Catalogue HD29479

SAO Catalogue SAO94051

Hipparcos Catalogue HIP21673

Durchmusterung Catalogue BD+15 665

In Evidence

Other stars in Taurus