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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
sunny DaytimeWhat's Visible Now?
All Constellations » Boötes » 

45 Boötis

Altitude: 11.8°   Azimuth: 64.7°   Direction: East-North-East

45 Boötis is a variable and multiple main-sequence star in the constellation of Boötes.

45 Boötis visual magnitude is 4.93. Because of its moderate brightness, 45 Boötis should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of 45 Boötis is 0.185 arcsec per year in Right Ascension and -0.165 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 45 Boötis star
DSS2 image of 45 Boötis. The red arrow shows the motion of 45 Boötis during the next 1000 years (3.08 arcmin in Right Ascension and -2.75 arcmin in declination);

Key facts about 45 Boötis


45 Boötis is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 11.8°
Azimuth: 64.7°
Direction: East-North-East

Celestial coordinates and finder chart of 45 Boötis

45 Boötis is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 45 Boötis are provided in the following table:

15h 07m 18s
+24° 52’ 09”

The simplified sky map below shows the position of 45 Boötis in the sky:

Finder chart 45 Boötis star
Simplified finder chart for 45 Boötis.

Visibility of 45 Boötis from your location

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

Today's 45 Boötis rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 65.1°
Max altitude: 63.4°
Azimuth: 294.9°

Distance of 45 Boötis from the Sun and relative movement

45 Boötis is distant 64.30 light years from the Sun and it is moving towards the Sun at the speed of 7 kilometers per second.

19.72 pc
64.30 ly
-7 km/s
0.185 arcsec/year
-0.165 arcsec/year

Spectral properties of 45 Boötis

45 Boötis belongs to spectral class F5 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where 45 Boötis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 45 Boötis. Attribution: Richard Powell / CC BY-SA

45 Boötis star system properties

45 Boötis is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the 45 Boötis double sysyem:

244.1 arcsec

Alternative designations of 45 Boötis