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
Help keep this site free and ads-free! Donate Now!
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 » 

π1 Boötis (pi1 Boötis)

Altitude: 15.4°   Azimuth: 82.8°   Direction: East

π1 Boötis is a variable and multiple star in the constellation of Boötes.

π1 Boötis visual magnitude is 4.94. Because of its moderate brightness, π1 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 π1 Boötis is 0.015 arcsec per year in Right Ascension and 0.015 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of π1 Boötis (pi1 Boötis) star
DSS2 image of π1 Boötis. The red arrow shows the motion of π1 Boötis during the next 10000 years (2.50 arcmin in Right Ascension and 2.50 arcmin in declination);

Key facts about π1 Boötis

4.94

π1 Boötis (pi1 Boötis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 15.4°
Azimuth: 82.8°
Direction: East

Celestial coordinates and finder chart of π1 Boötis

π1 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 π1 Boötis are provided in the following table:

14h 40m 43s
+16° 25’ 05”
15.64°
62.54°
Boötes

The simplified sky map below shows the position of π1 Boötis in the sky:

Finder chart π1 Boötis (pi1 Boötis) star
Simplified finder chart for π1 Boötis (pi1 Boötis).

Visibility of π1 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 π1 Boötis (pi1 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: 73.6°
Max altitude: 54.9°
Azimuth: 286.4°

Distance of π1 Boötis from the Sun and relative movement

π1 Boötis is distant 317.12 light years from the Sun and it is moving towards the Sun at the speed of 1 kilometers per second.

97.28 pc
317.12 ly
-1 km/s
0.015 arcsec/year
0.015 arcsec/year

Spectral properties of π1 Boötis

π1 Boötis belongs to spectral class B9 π1 Boötis is also a MnHgSi chemically peculiar star.

0.00
B9
10516K

The red dot in the diagram below shows where π1 Boötis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of π1 Boötis. Attribution: Richard Powell / CC BY-SA

π1 Boötis star system properties

π1 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 π1 Boötis double sysyem:

4.94
5.84
0.9
5.7 arcsec

Alternative designations of π1 Boötis

π1 Boötis
(pi1 Boötis)
SAO101138
SAO101138