θ2 Orionis (theta2 Orionis)

Altitude: 9.2° Azimuth: 249.0° Direction: West-South-West

θ2 Orionis is a variable and multiple main-sequence star in the constellation of Orion.

θ2 Orionis visual magnitude is 5.08. Because of its reltive faintness, θ2 Orionis 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 θ2 Orionis:

Color of θ2 Orionis ⬤

Magnitude of θ2 Orionis 5.08

Class Main-sequence

VISIBILITY RIGHT NOW

θ2 Orionis (theta2 Orionis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 9.2°
Azimuth: 249.0°
Direction: West-South-West

Celestial coordinates and finder chart of θ2 Orionis

θ2 Orionis 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 θ2 Orionis are provided in the following table:

Right Ascension J2000 05h 35m 22s

Declination J2000 -05° 24’ 57”

Galactic Longitude 209.05°

Galactic Latitude -19.37°

Constellation Orion

The simplified sky map below shows the position of θ2 Orionis in the sky:

Finder chart θ2 Orionis (theta2 Orionis) star

Simplified finder chart for θ2 Orionis (theta2 Orionis).

Visibility of θ2 Orionis 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 θ2 Orionis (theta2 Orionis) 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: 95.4° RISE 19:06

Max altitude: 33.1° TRANSIT 0:41

Azimuth: 264.6° SET 6:11

Digitized Sky Survey image of θ2 Orionis

The image below is a photograph of θ2 Orionis 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 θ2 Orionis is 0.001 arcsec per year in Right Ascension and 0.005 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of θ2 Orionis (theta2 Orionis) star

DSS2 image of θ2 Orionis. The red arrow shows the motion of θ2 Orionis during the next 100000 years (1.67 arcmin in Right Ascension and 8.33 arcmin in declination);

Distance of θ2 Orionis from the Sun and relative movement

θ2 Orionis is distant 1,895.35 light years from the Sun and it is moving far from the Sun at the speed of 36 kilometers per second.

Distance (parsec) 581.40 pc

Distance (light year) 1,895.35 ly

Heliocentric radial velocity 36 km/s

Proper Motion RA 0.001 arcsec/year

Proper Motion Dec 0.005 arcsec/year

Spectral properties of θ2 Orionis

θ2 Orionis belongs to spectral class O9 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -3.74

Spectral Type O9V

Color Index (B-V) -0.09

Temperature of θ2 Orionis 11407K

The red dot in the diagram below shows where θ2 Orionis is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of θ2 Orionis. Attribution: Richard Powell / CC BY-SA

θ2 Orionis star system properties

θ2 Orionis is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the θ2 Orionis double sysyem:

Main star magnitude 5.08

Secondary star magnitude 5.18

Magnitude difference 0.1

Separation 117 arcsec

Alternative designations of θ2 Orionis

Bayer designation θ2 Orionis
(theta2 Orionis)

Flamsteed designation 43 Orionis

Henry Draper Catalogue HD37041

SAO Catalogue SAO132321

Hipparcos Catalogue HIP26235

Durchmusterung Catalogue BD-05 1319

General Catalogue of Variable Stars 2320

Aitken Double Star Catalogue ADS4188

Support us

In Evidence

Other stars in Orion