HR7739

Above the horizon. Rise: 12:57 | Tran: 21:23 | Set: 5:53

Alt: 0.82° Az: 312.66° Direction: North-West

HR7739 is a variable and multiple main-sequence star of spectral class B3 in the constellation of Vulpecula.

HR7739 visual magnitude is 4.78. Because of its moderate brightness, HR7739 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 HR7739. The red arrow shows the motion of HR7739 during the next 100000 years (13.33 arcmin in Right Ascension and -10.00 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 20h 16m 18s

Declination +25° 40’ 07”

Hour Angle 08h 21m 18s

Sideral Time 04h 37m 37s

J2000

Right Ascension 20h 15m 15s

Declination +25° 35’ 30”

Galactic Coordinates

Galactic Longitude 65.19°

Galactic Latitude -5.17°

Finder Chart

Simplified finder chart for HR7739.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.78

Class Main-sequence

Absolute magnitude -3.05

Spectral Type B3V

Color Index (B-V) -0.18

Temperature 13121K

The red dot in the diagram below shows where HR7739 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7739. Attribution: Richard Powell / CC BY-SA

Star System Properties

HR7739 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR7739 double sysyem:

Main star magnitude 4.78

Secondary star magnitude 7.18

Magnitude difference 2.4

Separation 0.7 arcsec

Distance, Radial Speed, Proper Motion

HR7739 is distant 1,198.53 light years from the Sun and it is moving towards the Sun at the speed of 7 kilometers per second.

Distance (parsec) 367.65

Distance (light year) 1,198.53

Radial Speed -7 km/s

Proper Motion RA 0.008 arcsec/y

Proper Motion Dec -0.006"/y

Alternative Designations

Henry Draper Catalogue HD192685

SAO Catalogue SAO88410

Hipparcos Catalogue HIP99824

Durchmusterung Catalogue BD+25 4165

General Catalogue of Variable Stars QR Vul

Aitken Double Star Catalogue ADS13589

Visibility from Your Location

Today's HR7739 rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 64.3° RISE 12:57

Max altitude: 64.2° TRANSIT 21:23

Azimuth: 295.7° SET 5:53

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

Location

Other stars in Vulpecula