81 Tauri

Above the horizon. Rise: 22:25 | Tran: 5:49 | Set: 13:10

Alt: 43.68° Az: 126.68° Direction: South-East

81 Tauri is a double star of spectral class A5 in the constellation of Taurus.

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

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);

Celestial Coordinates

Apparent

Right Ascension 04h 32m 03s

Declination +15° 44’ 37”

Hour Angle 21h 31m 47s

Sideral Time 02h 03m 50s

J2000

Right Ascension 04h 30m 38s

Declination +15° 41’ 30”

Galactic Coordinates

Galactic Longitude 180.82°

Galactic Latitude -21.75°

Finder Chart

Simplified finder chart for 81 Tauri.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.48

Class

Absolute magnitude 2.25

Spectral Type A5

Color Index (B-V) 0.26

Temperature 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

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

Distance, Radial Speed, Proper Motion

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

Distance (light year) 144.57

Radial Speed 39 km/s

Proper Motion RA 0.103 arcsec/y

Proper Motion Dec -0.023"/y

Alternative Designations

Flamsteed designation 81 Tauri

Henry Draper Catalogue HD28546

SAO Catalogue SAO93978

Hipparcos Catalogue HIP21039

Durchmusterung Catalogue BD+15 639

Visibility from Your Location

Today's 81 Tauri rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 74.3° RISE 22:25

Max altitude: 54.3° TRANSIT 5:49

Azimuth: 285.7° SET 13:10

Name:	Greenwich, UK
Latitude:	51° 28' 48.0" N
Longitude:	0° 0' 0.0" E
Timezone:	Europe/London

Location

Other stars in Taurus