HR7640

Above the horizon. Rise: 12:24 | Tran: 21:38 | Set: 6:55

Alt: 56.74° Az: 113.91° Direction: East-South-East

HR7640 is a main-sequence star of spectral class B9 in the constellation of Cygnus.

HR7640 visual magnitude is 5.49. Because of its faintness, HR7640 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 HR7640. The red arrow shows the motion of HR7640 during the next 10000 years (6.83 arcmin in Right Ascension and 0.50 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 19h 59m 36s

Declination +31° 03’ 06”

Hour Angle 21h 36m 43s

Sideral Time 17h 36m 19s

J2000

Right Ascension 19h 58m 37s

Declination +30° 59’ 00”

Galactic Coordinates

Galactic Longitude 67.77°

Galactic Latitude 0.82°

Finder Chart

Simplified finder chart for HR7640.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.49

Class Main-sequence

Absolute magnitude -0.62

Spectral Type B9V

Color Index (B-V) -0.06

Temperature 10941K

The red dot in the diagram below shows where HR7640 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7640. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

HR7640 is distant 544.24 light years from the Sun and it is moving towards the Sun at the speed of 7 kilometers per second.

Distance (parsec) 166.94

Distance (light year) 544.24

Radial Speed -7 km/s

Proper Motion RA 0.041 arcsec/y

Proper Motion Dec 0.003"/y

Alternative Designations

Henry Draper Catalogue HD189395

SAO Catalogue SAO69188

Hipparcos Catalogue HIP98325

Durchmusterung Catalogue BD+30 3837

FK5 Catalogue 3594

Visibility from Your Location

Today's HR7640 rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 58.9° RISE 12:24

Max altitude: 69.6° TRANSIT 21:38

Azimuth: 301.1° SET 6:55

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

Location

Other stars in Cygnus