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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: 7:43  
clear_day Transit: 11:47  
SunsetSet: 15:52 south
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All Constellations » Hydra » 

Ukdah - ι Hydrae (iota Hydrae)

Altitude: -8.0°   Azimuth: 278.3°   Direction: West

Ukdah, also designated as ι Hydrae (iota Hydrae), is a variable giant star in the constellation of Hydra.

Ukdah visual magnitude is 3.91. Because of its moderate brightness, Ukdah should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about Ukdah:


Ukdah - ι Hydrae (iota Hydrae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -8.0°
Azimuth: 278.3°
Direction: West

Celestial coordinates and finder chart of Ukdah

Ukdah 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 Ukdah are provided in the following table:

09h 39m 51s
-01° 08’ 34”

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

Finder chart Ukdah - ι Hydrae (iota Hydrae) star
Simplified finder chart for Ukdah - ι Hydrae (iota Hydrae).

Visibility of Ukdah 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 Ukdah - ι Hydrae (iota Hydrae) 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: 91.1°
Max altitude: 37.4°
Azimuth: 268.9°

Digitized Sky Survey image of Ukdah

The image below is a photograph of Ukdah 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 Ukdah is 0.049 arcsec per year in Right Ascension and -0.064 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Ukdah - ι Hydrae (iota Hydrae) star
DSS2 image of Ukdah. The red arrow shows the motion of Ukdah during the next 10000 years (8.17 arcmin in Right Ascension and -10.67 arcmin in declination);

Distance of Ukdah from the Sun and relative movement

Ukdah is distant 275.57 light years from the Sun and it is moving far from the Sun at the speed of 23 kilometers per second.

84.53 pc
275.57 ly
23 km/s
0.049 arcsec/year
-0.064 arcsec/year

Spectral properties of Ukdah

Ukdah belongs to spectral class K2 and has a luminosity class of III corresponding to a giant star.


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

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

Alternative designations of Ukdah

ι Hydrae
(iota Hydrae)