HR6639

Below the horizon. Rise: 12:54 | Tran: 19:01 | Set: 1:13

Alt: -26.18° Az: 312.75° Direction: North-West

HR6639 is a hypergiant star of spectral class K0 in the constellation of Ophiuchus.

HR6639 visual magnitude is 6.47. Because of its faintness, HR6639 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 HR6639. The red arrow shows the motion of HR6639 during the next 10000 years (-4.17 arcmin in Right Ascension and 10.83 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 17h 50m 33s

Declination +01° 57’ 18”

Hour Angle 09h 14m 59s

Sideral Time 03h 05m 33s

J2000

Right Ascension 17h 49m 18s

Declination +01° 57’ 39”

Galactic Coordinates

Galactic Longitude 27.5°

Galactic Latitude 14.7°

Finder Chart

Simplified finder chart for HR6639.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 6.47

Class Hypergiant

Absolute magnitude 1.37

Spectral Type K0III

Color Index (B-V) 1.24

Temperature 4232K

The red dot in the diagram below shows where HR6639 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR6639. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

HR6639 is distant 341.72 light years from the Sun and it is moving towards the Sun at the speed of 58 kilometers per second.

Distance (parsec) 104.82

Distance (light year) 341.72

Radial Speed -58 km/s

Proper Motion RA -0.025 arcsec/y

Proper Motion Dec 0.065"/y

Alternative Designations

Henry Draper Catalogue HD162113

SAO Catalogue SAO122787

Hipparcos Catalogue HIP87224

Durchmusterung Catalogue BD+02 3406

Visibility from Your Location

Today's HR6639 rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 88.0° RISE 12:54

Max altitude: 40.5° TRANSIT 19:01

Azimuth: 272.0° SET 1:13

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

Location

Other stars in Ophiuchus