Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:44  
clear_day Transit: 12:57  
SunsetSet: 21:11 south
wb_twilight Nautical TwilightWhat's Visible Now
All Constellations » Ara » 


Altitude: -27.3°   Azimuth: 196.3°   Direction: South-South-West

HR6440 is a sub-giant star in the constellation of Ara.

HR6440 visual magnitude is 5.7. Because of its reltive faintness, HR6440 should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about HR6440:


HR6440 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -27.3°
Azimuth: 196.3°
Direction: South-South-West

Celestial coordinates and finder chart of HR6440

HR6440 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 HR6440 are provided in the following table:

17h 24m 01s
-62° 51’ 51”

The simplified sky map below shows the position of HR6440 in the sky:

Finder chart HR6440 star
Simplified finder chart for HR6440.

Visibility of HR6440 from your location

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

HR6440 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR6440

The image below is a photograph of HR6440 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 HR6440 is -0.001 arcsec per year in Right Ascension and -0.008 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of HR6440 star
DSS2 image of HR6440. The red arrow shows the motion of HR6440 during the next 100000 years (-1.67 arcmin in Right Ascension and -13.33 arcmin in declination);

Distance of HR6440 from the Sun and relative movement

HR6440 is distant 1,638.19 light years from the Sun and it is moving far from the Sun at the speed of 4 kilometers per second.

502.51 pc
1,638.19 ly
4 km/s
-0.001 arcsec/year
-0.008 arcsec/year

Spectral properties of HR6440

HR6440 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 HR6440 is situated in the HertzsprungÔÇôRussell diagram.

HR Diagram
H-R diagram showing the position of HR6440. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR6440