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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:38  
clear_day Transit: 11:46  
SunsetSet: 15:54 south
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All Constellations » Orion » 

Hatysa - ι Orionis (iota Orionis)

Altitude: 29.8°   Azimuth: 204.5°   Direction: South-South-West

Hatysa, also designated as ι Orionis (iota Orionis), is a variable and multiple giant star in the constellation of Orion.

Hatysa visual magnitude is 2.77. Thanks to its high brightness, Hatysa is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.

The table below summarizes the key facts about Hatysa:


Hatysa - ι Orionis (iota Orionis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 29.8°
Azimuth: 204.5°
Direction: South-South-West

Celestial coordinates and finder chart of Hatysa

Hatysa 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 Hatysa are provided in the following table:

05h 35m 26s
-05° 54’ 36”

The simplified sky map below shows the position of Hatysa in the sky:

Finder chart Hatysa - ι Orionis (iota Orionis) star
Simplified finder chart for Hatysa - ι Orionis (iota Orionis).

Visibility of Hatysa 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 Hatysa - ι Orionis (iota 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: 95.9°
Max altitude: 32.6°
Azimuth: 264.1°

Digitized Sky Survey image of Hatysa

The image below is a photograph of Hatysa 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 Hatysa is 0 arcsec per year in Right Ascension and 0.001 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of Hatysa - ι Orionis (iota Orionis) star
DSS2 image of Hatysa. The red arrow shows the motion of Hatysa during the next 100000 years (0.00 arcmin in Right Ascension and 1.67 arcmin in declination);

Distance of Hatysa from the Sun and relative movement

Hatysa is distant 1,325.20 light years from the Sun and it is moving far from the Sun at the speed of 22 kilometers per second.

406.50 pc
1,325.20 ly
22 km/s
0.001 arcsec/year

Spectral properties of Hatysa

Hatysa belongs to spectral class O9 and has a luminosity class of III corresponding to a giant star.


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

HR Diagram
H-R diagram showing the position of Hatysa. Attribution: Richard Powell / CC BY-SA

Hatysa star system properties

Hatysa 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 Hatysa double sysyem:

11.4 arcsec

Alternative designations of Hatysa

ι Orionis
(iota Orionis)