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Hatysa - ι Orionis (iota Orionis)

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:

Color of Hatysa ⬤

Magnitude of Hatysa 2.77

Class Giant

VISIBILITY RIGHT NOW Hatysa - ι Orionis (iota Orionis) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 4°.

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:

Right Ascension J2000 05h 35m 26s

Declination J2000 -05° 54’ 36”

Galactic Longitude 209.52°

Galactic Latitude -19.58°

Constellation Orion

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 [change]
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 [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 95.9° RISE 12:43

Max altitude: 32.6° TRANSIT 18:11

Azimuth: 264.1° SET 23:40

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

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.

Distance (parsec) 406.50 pc

Distance (light year) 1,325.20 ly

Heliocentric radial velocity 22 km/s

Proper Motion Dec 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.

Absolute magnitude -5.28

Spectral Type O9III

Color Index (B-V) -0.24

Temperature of Hatysa 14633K

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

Main star magnitude 2.77

Secondary star magnitude 7.27

Magnitude difference 4.5

Separation 11.4 arcsec

Alternative designations of Hatysa

Proper Name Hatysa

Bayer designation ι Orionis
(iota Orionis)

Flamsteed designation 44 Orionis

Henry Draper Catalogue HD37043

SAO Catalogue SAO132323

Hipparcos Catalogue HIP26241

Durchmusterung Catalogue BD-06 1241

FK5 Catalogue 209

General Catalogue of Variable Stars 2334

Aitken Double Star Catalogue ADS4193

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