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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: 7:40  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
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All Constellations » Crux » 

Imai - δ Crucis (delta Crucis)

Altitude: -52.5°   Azimuth: 231.8°   Direction: South-West

Imai, also designated as δ Crucis (delta Crucis), is a variable sub-giant star in the constellation of Crux.

Imai visual magnitude is 2.8. Thanks to its high brightness, Imai 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 Imai:


Imai - δ Crucis (delta Crucis) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -52.5°
Azimuth: 231.8°
Direction: South-West

Celestial coordinates and finder chart of Imai

Imai is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Imai are provided in the following table:

12h 15m 08s
-58° 44’ 56”

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

Finder chart Imai - δ Crucis (delta Crucis) star
Simplified finder chart for Imai - δ Crucis (delta Crucis).

Visibility of Imai from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Imai - δ Crucis (delta Crucis) is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of Imai

The image below is a photograph of Imai 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 Imai is -0.041 arcsec per year in Right Ascension and -0.009 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Imai - δ Crucis (delta Crucis) star
DSS2 image of Imai. The red arrow shows the motion of Imai during the next 10000 years (-6.83 arcmin in Right Ascension and -1.50 arcmin in declination);

Distance of Imai from the Sun and relative movement

Imai is distant 363.84 light years from the Sun and it is moving far from the Sun at the speed of 22 kilometers per second.

111.61 pc
363.84 ly
22 km/s
-0.041 arcsec/year
-0.009 arcsec/year

Spectral properties of Imai

Imai belongs to spectral class B2 and has a luminosity class of IV corresponding to a sub-giant star.


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

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

Alternative designations of Imai

δ Crucis
(delta Crucis)