θ1 Crucis (theta1 Crucis)

Below the horizon. Never rises today

Alt: -78.00° Az: 176.96° Direction: South

θ1 Crucis is a double star of spectral class A in the constellation of Crux.

θ1 Crucis visual magnitude is 4.33. Because of its moderate brightness, θ1 Crucis 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 θ1 Crucis. The red arrow shows the motion of θ1 Crucis during the next 1000 years (-2.50 arcmin in Right Ascension and 0.13 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 12h 04m 20s

Declination -63° 27’ 14”

Hour Angle 12h 05m 39s

Sidereal Time 00h 10m 00s

J2000

Right Ascension 12h 03m 01s

Declination -63° 18’ 46”

Galactic Coordinates

Galactic Longitude 297.53°

Galactic Latitude -0.95°

Finder Chart

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Finder chart for θ1 Crucis (theta1 Crucis).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.33

Class

θ1 Crucis is also a so called metallic star.

Absolute magnitude 0.09

Spectral Type A

Color Index (B-V) 0.27

Temperature 7658K

The red dot in the diagram below shows where θ1 Crucis is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of θ1 Crucis. Attribution: Richard Powell / CC BY-SA

Star System Properties

θ1 Crucis 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 θ1 Crucis double sysyem:

Main star magnitude 4.33

Secondary star magnitude 13.63

Magnitude difference 9.3

Separation 4.5 arcsec

Distance, Radial Speed, Proper Motion

θ1 Crucis is distant 229.74 light years from the Sun and it is moving towards the Sun at the speed of 2 kilometers per second.

Distance (parsec) 70.47

Distance (light year) 229.74

Radial Speed -2 km/s

Proper Motion RA -0.15 arcsec/y

Proper Motion Dec 0.008"/y

Alternative Designations

Bayer designation θ1 Crucis
(theta1 Crucis)

Henry Draper Catalogue HD104671

SAO Catalogue SAO251705

Hipparcos Catalogue HIP58758

Durchmusterung Catalogue CP-62 2543

Visibility from Your Location

θ1 Crucis (theta1 Crucis) is currently not visible from Greenwich, UK

Set Location

Other stars in Crux