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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 » Cancer » 


Altitude: -26.0°   Azimuth: 345.9°   Direction: North-North-West

HR3689 is a double sub-giant star in the constellation of Cancer.

HR3689 visual magnitude is 6.41. Because of its reltive faintness, HR3689 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 HR3689:


HR3689 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -26.0°
Azimuth: 345.9°
Direction: North-North-West

Celestial coordinates and finder chart of HR3689

HR3689 is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR3689 are provided in the following table:

09h 17m 51s
+11° 30’ 03”

The simplified sky map below shows the position of HR3689 in the sky:

Finder chart HR3689 star
Simplified finder chart for HR3689.

Visibility of HR3689 from your location

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

Today's HR3689 rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 78.5°
Max altitude: 50.0°
Azimuth: 281.5°

Digitized Sky Survey image of HR3689

The image below is a photograph of HR3689 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 HR3689 is -0.012 arcsec per year in Right Ascension and -0.003 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3689 star
DSS2 image of HR3689. The red arrow shows the motion of HR3689 during the next 10000 years (-2.00 arcmin in Right Ascension and -0.50 arcmin in declination);

Distance of HR3689 from the Sun and relative movement

HR3689 is distant 541.53 light years from the Sun and it is moving towards the Sun at the speed of 7 kilometers per second.

166.11 pc
541.53 ly
-7 km/s
-0.012 arcsec/year
-0.003 arcsec/year

Spectral properties of HR3689

HR3689 belongs to spectral class A2 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where HR3689 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3689. Attribution: Richard Powell / CC BY-SA

HR3689 star system properties

HR3689 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 HR3689 double sysyem:

21.8 arcsec

Alternative designations of HR3689