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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
sunny DaytimeWhat's Visible Now?
All Constellations » Apus » 


Altitude: -39.7°   Azimuth: 190.4°   Direction: South

HR6635 is a double giant star in the constellation of Apus.

HR6635 visual magnitude is 6.07. Because of its reltive faintness, HR6635 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 HR6635:


HR6635 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -39.7°
Azimuth: 190.4°
Direction: South

Celestial coordinates and finder chart of HR6635

HR6635 is situated close to the southern celestial pole and, as such, it is easilty visible for most part of the year from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR6635 are provided in the following table:

17h 57m 41s
-76° 10’ 38”

The simplified sky map below shows the position of HR6635 in the sky:

Finder chart HR6635 star
Simplified finder chart for HR6635.

Visibility of HR6635 from your location

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

HR6635 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR6635

The image below is a photograph of HR6635 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 HR6635 is 0.002 arcsec per year in Right Ascension and 0.017 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR6635 star
DSS2 image of HR6635. The red arrow shows the motion of HR6635 during the next 10000 years (0.33 arcmin in Right Ascension and 2.83 arcmin in declination);

Distance of HR6635 from the Sun and relative movement

HR6635 is distant 594.89 light years from the Sun and it is moving far from the Sun at the speed of 37 kilometers per second.

182.48 pc
594.89 ly
37 km/s
0.002 arcsec/year
0.017 arcsec/year

Spectral properties of HR6635

HR6635 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 HR6635 is situated in the HertzsprungÔÇôRussell diagram.

HR Diagram
H-R diagram showing the position of HR6635. Attribution: Richard Powell / CC BY-SA

HR6635 star system properties

HR6635 is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the HR6635 double sysyem:

25.5 arcsec

Alternative designations of HR6635