θ1 Orionis (theta1 Orionis)

Above the horizon. Rise: 9:07 | Tran: 14:38 | Set: 20:09

Alt: 30.71° Az: 202.94° Direction: South-South-West

θ1 Orionis is a variable and multiple hypergiant star of spectral class B0 in the constellation of Orion.

θ1 Orionis visual magnitude is 6.7. Because of its faintness, θ1 Orionis is not visible to the naked eye.

Image of θ1 Orionis (theta1 Orionis) star

DSS2 image of θ1 Orionis. The red arrow shows the motion of θ1 Orionis during the next 100000 years (8.33 arcmin in Right Ascension and 3.33 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 05h 36m 32s

Declination -05° 22’ 22”

Hour Angle 01h 18m 39s

Sidereal Time 06h 55m 12s

J2000

Right Ascension 05h 35m 17s

Declination -05° 23’ 16”

Galactic Coordinates

Galactic Longitude 209.01°

Galactic Latitude -19.38°

Finder Chart

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Finder chart for θ1 Orionis (theta1 Orionis).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 6.7

Class Hypergiant

Absolute magnitude -23.30

Spectral Type B0V

Color Index (B-V) 0.09

Temperature 9125K

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

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

Star System Properties

θ1 Orionis is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the θ1 Orionis double sysyem:

Main star magnitude 6.7

Secondary star magnitude 6.8

Magnitude difference 0.1

Separation 117 arcsec

Distance, Radial Speed, Proper Motion

θ1 Orionis is distant 32,600,000.00 light years from the Sun and it is moving far from the Sun at the speed of 31 kilometers per second.

Distance (parsec) 10,000,000.00

Distance (light year) 32,600,000.00

Radial Speed 31 km/s

Proper Motion RA 0.005 arcsec/y

Proper Motion Dec 0.002"/y

Alternative Designations

Bayer designation θ1 Orionis
(theta1 Orionis)

Flamsteed designation 41 Orionis

Henry Draper Catalogue HD37023

Hipparcos Catalogue HIP26224

Durchmusterung Catalogue BD-05 1315

General Catalogue of Variable Stars 2295

Aitken Double Star Catalogue ADS4186

Visibility from Your Location

Today's θ1 Orionis (theta1 Orionis) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 95.4° RISE 9:07

Max altitude: 33.1° TRANSIT 14:38

Azimuth: 264.6° SET 20:09

Set Location

Other stars in Orion