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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
north SunriseRise: 7:48  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
sunny DaytimeWhat's Visible Now?
All Constellations » Libra » 

ι1 Librae (iota1 Librae)

Altitude: -5.2°   Azimuth: 244.4°   Direction: West-South-West

ι1 Librae is a variable and multiple hypergiant star in the constellation of Libra.

ι1 Librae visual magnitude is 4.54. Because of its moderate brightness, ι1 Librae 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 table below summarizes the key facts about ι1 Librae:


ι1 Librae (iota1 Librae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -5.2°
Azimuth: 244.4°
Direction: West-South-West

Celestial coordinates and finder chart of ι1 Librae

ι1 Librae 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 ι1 Librae are provided in the following table:

15h 12m 13s
-19° 47’ 30”

The simplified sky map below shows the position of ι1 Librae in the sky:

Finder chart ι1 Librae (iota1 Librae) star
Simplified finder chart for ι1 Librae (iota1 Librae).

Visibility of ι1 Librae 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 ι1 Librae (iota1 Librae) 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: 109.8°
Max altitude: 18.7°
Azimuth: 250.2°

Digitized Sky Survey image of ι1 Librae

The image below is a photograph of ι1 Librae from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of ι1 Librae is -0.036 arcsec per year in Right Ascension and -0.039 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ι1 Librae (iota1 Librae) star
DSS2 image of ι1 Librae. The red arrow shows the motion of ι1 Librae during the next 10000 years (-6.00 arcmin in Right Ascension and -6.50 arcmin in declination);

Distance of ι1 Librae from the Sun and relative movement

ι1 Librae is distant 376.44 light years from the Sun and it is moving towards the Sun at the speed of 12 kilometers per second.

115.47 pc
376.44 ly
-12 km/s
-0.036 arcsec/year
-0.039 arcsec/year

Spectral properties of ι1 Librae

ι1 Librae belongs to spectral class A0 ι1 Librae is also a Si chemically peculiar star.


The red dot in the diagram below shows where ι1 Librae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of ι1 Librae. Attribution: Richard Powell / CC BY-SA

ι1 Librae star system properties

ι1 Librae is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the ι1 Librae double sysyem:

0.1 arcsec

Alternative designations of ι1 Librae

ι1 Librae
(iota1 Librae)