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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:09 
Transit: 12:56 
Sunset: 20:44
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All Constellations » Ophiuchus » 

HR6639

Above the horizon.  Rise: 21:06 | Tran: 3:18 | Set: 9:26
Alt: 38.46°   Az: 158.10°   Direction: South-South-East

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.

Image of HR6639 star
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

17h 50m 35s
+01° 57’ 17”
22h 52m 02s
16h 42m 37s

J2000

17h 49m 18s
+01° 57’ 39”

Galactic Coordinates

27.5°
14.7°

Finder Chart

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Finder chart for HR6639.

Magnitude, Color, Spectral Class

6.47
Hypergiant

1.37
K0III
4232K

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

HR 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.

104.82
341.72
-58 km/s
-0.025 arcsec/y
0.065"/y

Alternative Designations

SAO122787
SAO122787

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°
Max altitude: 40.5°
Azimuth: 272.0°