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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 5:51  
clear_day Transit: 12:57  
SunsetSet: 20:04
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All Constellations » Boötes » 

φ Boötis (phi Boötis)

Altitude: 11.1°   Azimuth: 35.6°   Direction: North-East

φ Boötis is a giant star in the constellation of Boötes.

φ Boötis visual magnitude is 5.24. Because of its reltive faintness, φ Boötis should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of φ Boötis is 0.063 arcsec per year in Right Ascension and 0.062 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of φ Boötis (phi Boötis) star
DSS2 image of φ Boötis. The red arrow shows the motion of φ Boötis during the next 10000 years (10.50 arcmin in Right Ascension and 10.33 arcmin in declination);

Key facts about φ Boötis


φ Boötis (phi Boötis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 11.1°
Azimuth: 35.6°
Direction: North-East

Celestial coordinates and finder chart of φ Boötis

φ Boötis is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of φ Boötis are provided in the following table:

15h 37m 49s
+40° 21’ 11”

The simplified sky map below shows the position of φ Boötis in the sky:

Finder chart φ Boötis (phi Boötis) star
Simplified finder chart for φ Boötis (phi Boötis).

Visibility of φ Boötis from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

φ Boötis (phi Boötis) is circumpolar and transits at 01:39 UTC (altitude: 78.9°)

Distance of φ Boötis from the Sun and relative movement

φ Boötis is distant 163.00 light years from the Sun and it is moving towards the Sun at the speed of 10 kilometers per second.

50.00 pc
163.00 ly
-10 km/s
0.063 arcsec/year
0.062 arcsec/year

Spectral properties of φ Boötis

φ Boötis belongs to spectral class G7 and has a luminosity class of III corresponding to a giant star.


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

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

Alternative designations of φ Boötis

φ Boötis
(phi Boötis)