η Librae (eta Librae)

Altitude: -54.0° Azimuth: 351.6° Direction: North

η Librae is a hypergiant star in the constellation of Libra.

η Librae visual magnitude is 5.41. Because of its reltive faintness, η Librae should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about η Librae:

Color of η Librae ⬤

Magnitude of η Librae 5.41

Class Hypergiant

VISIBILITY RIGHT NOW

η Librae (eta Librae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -54.0°
Azimuth: 351.6°
Direction: North

Celestial coordinates and finder chart of η Librae

η 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 η Librae are provided in the following table:

Right Ascension J2000 15h 44m 04s

Declination J2000 -15° 40’ 22”

Galactic Longitude 352.52°

Galactic Latitude 30.13°

Constellation Libra

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

Simplified finder chart for η Librae (eta Librae).

Visibility of η 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 η Librae (eta 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: 105.7° RISE 5:48

Max altitude: 22.8° TRANSIT 10:24

Azimuth: 254.3° SET 15:00

Digitized Sky Survey image of η Librae

The image below is a photograph of η 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 η Librae is -0.034 arcsec per year in Right Ascension and -0.066 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of η Librae. The red arrow shows the motion of η Librae during the next 10000 years (-5.67 arcmin in Right Ascension and -11.00 arcmin in declination);

Distance of η Librae from the Sun and relative movement

η Librae is distant 146.78 light years from the Sun and it is moving towards the Sun at the speed of 31 kilometers per second.

Distance (parsec) 45.02 pc

Distance (light year) 146.78 ly

Heliocentric radial velocity -31 km/s

Proper Motion RA -0.034 arcsec/year

Proper Motion Dec -0.066 arcsec/year

Spectral properties of η Librae

η Librae belongs to spectral class F0 and has a luminosity class of IV corresponding to a hypergiant star.

Absolute magnitude 2.14

Spectral Type F0IV

Color Index (B-V) 0.23

Temperature of η Librae 7938K

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

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

Alternative designations of η Librae

Bayer designation η Librae
(eta Librae)

Flamsteed designation 44 Librae

Henry Draper Catalogue HD140417

SAO Catalogue SAO159466

Hipparcos Catalogue HIP77060

Durchmusterung Catalogue BD-15 4171

FK5 Catalogue 3246

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