θ Lyrae (theta Lyrae)

Below the horizon. Rise: 17:09 | Tran: 2:38 | Set: 12:03

Alt: -3.44° Az: 20.43° Direction: South

θ Lyrae is a variable and multiple hypergiant star of spectral class K0 in the constellation of Lyra.

θ Lyrae visual magnitude is 4.36. Because of its moderate brightness, θ Lyrae 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.

DSS2 image of θ Lyrae. The red arrow shows the motion of θ Lyrae during the next 100000 years (-1.67 arcmin in Right Ascension and 6.67 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 19h 17m 15s

Declination +38° 10’ 48”

Hour Angle 13h 45m 15s

Sidereal Time 09h 02m 30s

J2000

Right Ascension 19h 16m 22s

Declination +38° 08’ 00”

Galactic Coordinates

Galactic Longitude 69.9°

Galactic Latitude 11.86°

Finder Chart

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Finder chart for θ Lyrae (theta Lyrae).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.36

Class Hypergiant

Absolute magnitude -2.50

Spectral Type K0II

Color Index (B-V) 1.26

Temperature 4194K

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

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

Star System Properties

θ Lyrae 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 θ Lyrae double sysyem:

Main star magnitude 4.36

Secondary star magnitude 9.06

Magnitude difference 4.7

Separation 100.2 arcsec

Distance, Radial Speed, Proper Motion

θ Lyrae is distant 768.87 light years from the Sun and it is moving towards the Sun at the speed of 31 kilometers per second.

Distance (parsec) 235.85

Distance (light year) 768.87

Radial Speed -31 km/s

Proper Motion RA -0.001 arcsec/y

Proper Motion Dec 0.004"/y

Alternative Designations

Bayer designation θ Lyrae
(theta Lyrae)

Flamsteed designation 21 Lyrae

Henry Draper Catalogue HD180809

SAO Catalogue SAO68065

Hipparcos Catalogue HIP94713

Durchmusterung Catalogue BD+37 3398

FK5 Catalogue 724

General Catalogue of Variable Stars 11873

Visibility from Your Location

Today's θ Lyrae (theta Lyrae) rise, transit and set times from San Daniele Po, Italy are the following (all times relative to the local timezone Europe/Rome):

Azimuth: 51.8° RISE 17:09

Max altitude: 83.1° TRANSIT 2:38

Azimuth: 308.2° SET 12:03

Name:	San Daniele Po, Italy
Latitude:	45° 4' 2.3" N
Longitude:	10° 10' 35.0" E
Timezone:	Europe/Rome

Set Location

Other stars in Lyra