We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
A Complete Guide to the Solar System and the Night Sky
Your support helps us pay the server bills » Donate
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 7:03  
clear_day Transit: 12:12  
SunsetSet: 17:22
sleep NighttimeWhat's Visible Now?
All Constellations » Boötes » 

Alkalurops - μ1 Boötis (mu1 Boötis)

Altitude: 16.8°   Azimuth: 50.2°   Direction: North-East

Alkalurops, also designated as μ1 Boötis (mu1 Boötis), is a variable and multiple sub-giant star in the constellation of Boötes.

Alkalurops visual magnitude is 4.31. Because of its moderate brightness, Alkalurops should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The proper motion of Alkalurops is -0.146 arcsec per year in Right Ascension and 0.087 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Alkalurops - μ1 Boötis (mu1 Boötis) star
DSS2 image of Alkalurops. The red arrow shows the motion of Alkalurops during the next 1000 years (-2.43 arcmin in Right Ascension and 1.45 arcmin in declination);

Key facts about Alkalurops


Alkalurops - μ1 Boötis (mu1 Boötis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 16.8°
Azimuth: 50.2°
Direction: North-East

Celestial coordinates and finder chart of Alkalurops

Alkalurops 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 Alkalurops are provided in the following table:

15h 24m 29s
+37° 22’ 37”

The simplified sky map below shows the position of Alkalurops in the sky:

Finder chart Alkalurops - μ1 Boötis (mu1 Boötis) star
Simplified finder chart for Alkalurops - μ1 Boötis (mu1 Boötis).

Visibility of Alkalurops 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 Alkalurops - μ1 Boötis (mu1 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: 52.6°
Max altitude: 75.9°
Azimuth: 307.4°

Distance of Alkalurops from the Sun and relative movement

Alkalurops is distant 120.92 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

37.09 pc
120.92 ly
-13 km/s
-0.146 arcsec/year
0.087 arcsec/year

Spectral properties of Alkalurops

Alkalurops belongs to spectral class F2 and has a luminosity class of IV corresponding to a sub-giant star.


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

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

Alkalurops star system properties

Alkalurops is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the Alkalurops double sysyem:

108.9 arcsec

Alternative designations of Alkalurops

μ1 Boötis
(mu1 Boötis)
NN 3903 A