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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: 7:52  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sunny DaytimeWhat's Visible Now?
All Constellations » Apus » 


Altitude: -31.8°   Azimuth: 175.5°   Direction: South

HR6400 is a double hypergiant star in the constellation of Apus.

HR6400 visual magnitude is 6.53. Because of its reltive faintness, HR6400 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 HR6400:


HR6400 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -31.8°
Azimuth: 175.5°
Direction: South

Celestial coordinates and finder chart of HR6400

HR6400 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 HR6400 are provided in the following table:

17h 20m 12s
-70° 02’ 44”

The simplified sky map below shows the position of HR6400 in the sky:

Finder chart HR6400 star
Simplified finder chart for HR6400.

Visibility of HR6400 from your location

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

HR6400 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR6400

The image below is a photograph of HR6400 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 HR6400 is -0.045 arcsec per year in Right Ascension and -0.201 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR6400 star
DSS2 image of HR6400. The red arrow shows the motion of HR6400 during the next 1000 years (-0.75 arcmin in Right Ascension and -3.35 arcmin in declination);

Distance of HR6400 from the Sun and relative movement

HR6400 is distant 126.45 light years from the Sun and it is moving towards the Sun at the speed of 5 kilometers per second.

38.79 pc
126.45 ly
-5 km/s
-0.045 arcsec/year
-0.201 arcsec/year

Spectral properties of HR6400

HR6400 belongs to spectral class G0 and has a luminosity class of IV corresponding to a hypergiant star.


The red dot in the diagram below shows where HR6400 is situated in the HertzsprungÔÇôRussell diagram.

HR Diagram
H-R diagram showing the position of HR6400. Attribution: Richard Powell / CC BY-SA

HR6400 star system properties

HR6400 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR6400 double sysyem:

1.4 arcsec

Alternative designations of HR6400