Aladfar - η Lyrae (eta Lyrae)

Above the horizon. Circumpolar today

Alt: 5.92° Az: 332.86° Direction: North-North-West

Aladfar, also designated as η Lyrae (eta Lyrae), is a variable and multiple sub-giant star of spectral class B2 in the constellation of Lyra.

Aladfar visual magnitude is 4.39. Because of its moderate brightness, Aladfar is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

Image of Aladfar - η Lyrae (eta Lyrae) star

DSS2 image of Aladfar. The red arrow shows the motion of Aladfar during the next 100000 years (6.67 arcmin in Right Ascension and 3.33 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 19h 14m 37s

Declination +39° 11’ 27”

Hour Angle 09h 36m 38s

Sidereal Time 04h 51m 15s

J2000

Right Ascension 19h 13m 45s

Declination +39° 08’ 45”

Galactic Coordinates

Galactic Longitude 70.62°

Galactic Latitude 12.75°

Finder Chart

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Finder chart for Aladfar - η Lyrae (eta Lyrae).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.39

Class Sub-giant

Absolute magnitude -3.13

Spectral Type B2IV

Color Index (B-V) -0.15

Temperature 12489K

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

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

Star System Properties

Aladfar 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 Aladfar double sysyem:

Main star magnitude 4.39

Secondary star magnitude 8.39

Magnitude difference 4

Separation 28.3 arcsec

Distance, Radial Speed, Proper Motion

Aladfar is distant 1,041.53 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

Distance (parsec) 319.49

Distance (light year) 1,041.53

Radial Speed -8 km/s

Proper Motion RA 0.004 arcsec/y

Proper Motion Dec 0.002"/y

Alternative Designations

Proper Name Aladfar

Bayer designation η Lyrae
(eta Lyrae)

Flamsteed designation 20 Lyrae

Henry Draper Catalogue HD180163

SAO Catalogue SAO68010

Hipparcos Catalogue HIP94481

Durchmusterung Catalogue BD+38 3490

General Catalogue of Variable Stars 11839

Aitken Double Star Catalogue ADS12197

Visibility from Your Location

Aladfar - η Lyrae (eta Lyrae) is circumpolar and transits at 03:14 UTC (altitude: 77.7°)

Set Location

Other stars in Lyra