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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: 7:03  
clear_day Transit: 12:12  
SunsetSet: 17:22
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All Constellations » Boötes » 

ι Boötis (iota Boötis)

Altitude: 32.5°   Azimuth: 46.6°   Direction: North-East

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

ι Boötis visual magnitude is 4.75. Because of its moderate brightness, ι Boötis 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 ι Boötis is -0.15 arcsec per year in Right Ascension and 0.092 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of ι Boötis (iota Boötis) star
DSS2 image of ι Boötis. The red arrow shows the motion of ι Boötis during the next 1000 years (-2.50 arcmin in Right Ascension and 1.53 arcmin in declination);

Key facts about ι Boötis


ι Boötis (iota Boötis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 32.5°
Azimuth: 46.6°
Direction: North-East

Celestial coordinates and finder chart of ι Boötis

ι 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 ι Boötis are provided in the following table:

14h 16m 09s
+51° 22’ 01”

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

Finder chart ι Boötis (iota Boötis) star
Simplified finder chart for ι Boötis (iota Boötis).

Visibility of ι Boötis from your location

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

ι Boötis (iota Boötis) is circumpolar and transits at 04:13 UTC (altitude: 89.9°)

Distance of ι Boötis from the Sun and relative movement

ι Boötis is distant 97.20 light years from the Sun and it is moving towards the Sun at the speed of 19 kilometers per second.

29.82 pc
97.20 ly
-19 km/s
-0.15 arcsec/year
0.092 arcsec/year

Spectral properties of ι Boötis

ι Boötis belongs to spectral class A9 and has a luminosity class of V corresponding to a main-sequence star.


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

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

ι Boötis star system properties

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

38.7 arcsec

Alternative designations of ι Boötis

ι Boötis
(iota Boötis)
Wo 9474 A