81 Tauri

81 Tauri is a double star in the constellation of Taurus.

81 Tauri visual magnitude is 5.48. Because of its reltive faintness, 81 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 81 Tauri:

Color of 81 Tauri ⬤

Magnitude of 81 Tauri 5.48

Class

VISIBILITY RIGHT NOW 81 Tauri is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of 81 Tauri

81 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 81 Tauri are provided in the following table:

Right Ascension J2000 04h 30m 38s

Declination J2000 +15° 41’ 30”

Galactic Longitude 180.82°

Galactic Latitude -21.75°

Constellation Taurus

The simplified sky map below shows the position of 81 Tauri in the sky:

Simplified finder chart for 81 Tauri.

Visibility of 81 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 81 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: 74.3° RISE 5:27

Max altitude: 54.2° TRANSIT 12:47

Azimuth: 285.7° SET 20:08

RIGHT NOW 81 Tauri is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 81 Tauri

The image below is a photograph of 81 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 81 Tauri is 0.103 arcsec per year in Right Ascension and -0.023 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of 81 Tauri. The red arrow shows the motion of 81 Tauri during the next 1000 years (1.72 arcmin in Right Ascension and -0.38 arcmin in declination);

Distance of 81 Tauri from the Sun and relative movement

81 Tauri is distant 144.57 light years from the Sun and it is moving far from the Sun at the speed of 39 kilometers per second.

Distance (parsec) 44.35 pc

Distance (light year) 144.57 ly

Heliocentric radial velocity 39 km/s

Proper Motion RA 0.103 arcsec/year

Proper Motion Dec -0.023 arcsec/year

Spectral properties of 81 Tauri

81 Tauri belongs to spectral class A5

Absolute magnitude 2.25

Spectral Type A5

Color Index (B-V) 0.26

Temperature of 81 Tauri 7726K

The red dot in the diagram below shows where 81 Tauri is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 81 Tauri. Attribution: Richard Powell / CC BY-SA

81 Tauri star system properties

81 Tauri is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the 81 Tauri double sysyem:

Main star magnitude 5.48

Secondary star magnitude 9.38

Magnitude difference 3.9

Separation 162 arcsec

Alternative designations of 81 Tauri

Flamsteed designation 81 Tauri

Henry Draper Catalogue HD28546

SAO Catalogue SAO93978

Hipparcos Catalogue HIP21039

Durchmusterung Catalogue BD+15 639

In Evidence

Other stars in Taurus