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public LocationGreenwich, UK
TimezoneEurope/London
Sunrise: 5:15 
Transit: 13:06 
Sunset: 20:56
sunny   (Daytime)   What's Visible Now?
All Constellations » Ophiuchus » 

Rasalhague - α Ophiuchi (alpha Ophiuchi)

Below the horizon.  Rise: 15:17 | Tran: 22:19 | Set: 5:26
Alt: -23.98°   Az: 19.86°   Direction: North-North-East

Rasalhague, also designated as α Ophiuchi (alpha Ophiuchi), is a variable giant star of spectral class A5 in the constellation of Ophiuchus.

Rasalhague visual magnitude is 2.08, making it the 58th brightest star in the sky. Because of its brightness, Rasalhague is clearly visible to the naked eye when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

Image of Rasalhague - α Ophiuchi (alpha Ophiuchi) star
DSS2 image of Rasalhague. The red arrow shows the motion of Rasalhague during the next 1000 years (2.00 arcmin in Right Ascension and -3.77 arcmin in declination);

Celestial Coordinates

Apparent

17h 36m 04s
+12° 32’ 43”
13h 14m 10s
06h 50m 15s

J2000

17h 34m 56s
+12° 33’ 36”

Galactic Coordinates

35.9°
22.57°

Finder Chart

Finder chart Rasalhague - α Ophiuchi (alpha Ophiuchi) star
Simplified finder chart for Rasalhague - α Ophiuchi (alpha Ophiuchi).

Magnitude, Color, Spectral Class

2.08
Giant

1.30
A5III
8571K

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

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

Distance, Radial Speed, Proper Motion

Rasalhague is distant 46.68 light years from the Sun and it is moving far from the Sun at the speed of 13 kilometers per second.

14.32
46.68
13 km/s
0.12 arcsec/y
-0.226"/y

Alternative Designations

Rasalhague
α Ophiuchi
(alpha Ophiuchi)
55 Ophiuchi
SAO102932
SAO102932

Visibility from Your Location

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

Azimuth: 77.5°
Max altitude: 51.1°
Azimuth: 282.5°