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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: 7:51  
clear_day Transit: 11:50  
SunsetSet: 15:49 south
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All Constellations » Horologium » 


Altitude: -26.6°   Azimuth: 210.8°   Direction: South-South-West

HR688 is a double giant star in the constellation of Horologium.

HR688 visual magnitude is 5.81. Because of its reltive faintness, HR688 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 HR688:


HR688 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -26.6°
Azimuth: 210.8°
Direction: South-South-West

Celestial coordinates and finder chart of HR688

HR688 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 HR688 are provided in the following table:

02h 19m 54s
-55° 56’ 40”

The simplified sky map below shows the position of HR688 in the sky:

Finder chart HR688 star
Simplified finder chart for HR688.

Visibility of HR688 from your location

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

HR688 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR688

The image below is a photograph of HR688 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 HR688 is 0.026 arcsec per year in Right Ascension and 0.02 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR688 star
DSS2 image of HR688. The red arrow shows the motion of HR688 during the next 10000 years (4.33 arcmin in Right Ascension and 3.33 arcmin in declination);

Distance of HR688 from the Sun and relative movement

HR688 is distant 564.01 light years from the Sun and it is moving far from the Sun at the speed of 49 kilometers per second.

173.01 pc
564.01 ly
49 km/s
0.026 arcsec/year
0.02 arcsec/year

Spectral properties of HR688

HR688 belongs to spectral class K5 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR688 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR688. Attribution: Richard Powell / CC BY-SA

HR688 star system properties

HR688 is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the HR688 double sysyem:

33.8 arcsec

Alternative designations of HR688