η Orionis (eta Orionis)

Below the horizon. Rise: 8:37 | Tran: 14:24 | Set: 20:10

Alt: -1.18° Az: 92.33° Direction: East

η Orionis is a variable and multiple main-sequence star of spectral class B1 in the constellation of Orion.

η Orionis visual magnitude is 3.36. Because of its moderate brightness, η Orionis 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 η Orionis. The red arrow shows the motion of η Orionis during the next 100000 years (3.33 arcmin in Right Ascension and 0.00 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 05h 25m 45s

Declination -02° 22’ 31”

Hour Angle 18h 04m 19s

Sidereal Time 23h 30m 05s

J2000

Right Ascension 05h 24m 28s

Declination -02° 23’ 48”

Galactic Coordinates

Galactic Longitude 204.87°

Galactic Latitude -20.39°

Finder Chart

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Finder chart for η Orionis (eta Orionis).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 3.36

Class Main-sequence

Absolute magnitude -3.85

Spectral Type B1V

Color Index (B-V) -0.17

Temperature 12902K

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

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

Star System Properties

η Orionis is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the η Orionis double sysyem:

Main star magnitude 3.36

Secondary star magnitude 4.76

Magnitude difference 1.4

Separation 1.5 arcsec

Distance, Radial Speed, Proper Motion

η Orionis is distant 900.55 light years from the Sun and it is moving far from the Sun at the speed of 20 kilometers per second.

Distance (parsec) 276.24

Distance (light year) 900.55

Radial Speed 20 km/s

Proper Motion RA 0.002 arcsec/y

Alternative Designations

Bayer designation η Orionis
(eta Orionis)

Flamsteed designation 28 Orionis

Henry Draper Catalogue HD35411

SAO Catalogue SAO132071

Hipparcos Catalogue HIP25281

Durchmusterung Catalogue BD-02 1235

General Catalogue of Variable Stars Eta Ori

Aitken Double Star Catalogue ADS4002

Visibility from Your Location

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

Azimuth: 92.4° RISE 8:37

Max altitude: 36.1° TRANSIT 14:24

Azimuth: 267.6° SET 20:10

Set Location

Other stars in Orion