HR5781

Below the horizon. Rise: 21:36 | Tran: 23:06 | Set: 0:37

Alt: -61.51° Az: 108.68° Direction: East-South-East

HR5781 is a variable and double sub-giant star of spectral class B3 in the constellation of Lupus.

HR5781 visual magnitude is 4.54. Because of its moderate brightness, HR5781 is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

DSS2 image of HR5781. The red arrow shows the motion of HR5781 during the next 10000 years (-4.17 arcmin in Right Ascension and -5.00 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 15h 37m 39s

Declination -45° 02’ 30”

Hour Angle 14h 38m 59s

Sidereal Time 06h 16m 39s

J2000

Right Ascension 15h 35m 53s

Declination -44° 57’ 30”

Galactic Coordinates

Galactic Longitude 331.02°

Galactic Latitude 8.76°

Finder Chart

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Finder chart for HR5781.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.54

Class Sub-giant

Absolute magnitude -1.08

Spectral Type B3IV

Color Index (B-V) -0.18

Temperature 13121K

The red dot in the diagram below shows where HR5781 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR5781. Attribution: Richard Powell / CC BY-SA

Star System Properties

HR5781 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR5781 double sysyem:

Main star magnitude 4.54

Secondary star magnitude 6.44

Magnitude difference 1.9

Separation 2.4 arcsec

Distance, Radial Speed, Proper Motion

HR5781 is distant 434.09 light years from the Sun and it is moving far from the Sun at the speed of 7 kilometers per second.

Distance (parsec) 133.16

Distance (light year) 434.09

Radial Speed 7 km/s

Proper Motion RA -0.025 arcsec/y

Proper Motion Dec -0.03"/y

Alternative Designations

Henry Draper Catalogue HD138769

SAO Catalogue SAO225950

Hipparcos Catalogue HIP76371

Durchmusterung Catalogue CD-4410239

General Catalogue of Variable Stars Var?

Visibility from Your Location

Today's HR5781 rise, transit and set times from Llano de Bureba, Spain are the following (all times relative to the local timezone Europe/Madrid):

Azimuth: 135.0° RISE 21:36

Max altitude: 2.3° TRANSIT 23:06

Azimuth: 225.0° SET 0:37

Name:	Llano de Bureba, Spain
Latitude:	42° 37' 27.8" N
Longitude:	3° 27' 32.0" W
Timezone:	Europe/Madrid

Set Location

Other stars in Lupus