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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
SunriseRise: 5:43  
clear_day Transit: 12:56  
SunsetSet: 20:10
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All Constellations » Vela » 

HR3688

Altitude: -81.9°   Azimuth: 38.8°   Direction: North-East

HR3688 is a variable and double supergiant star in the constellation of Vela.

HR3688 visual magnitude is 6.04. Because of its reltive faintness, HR3688 should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of HR3688 is 0.017 arcsec per year in Right Ascension and 0.009 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3688 star
DSS2 image of HR3688. The red arrow shows the motion of HR3688 during the next 10000 years (2.83 arcmin in Right Ascension and 1.50 arcmin in declination);

Key facts about HR3688

6.04
Supergiant

HR3688 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -81.9°
Azimuth: 38.8°
Direction: North-East

Celestial coordinates and finder chart of HR3688

HR3688 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 HR3688 are provided in the following table:

09h 16m 04s
-44° 53’ 54”
268°
2.87°
Vela

The simplified sky map below shows the position of HR3688 in the sky:

Finder chart HR3688 star
Simplified finder chart for HR3688.

Visibility of HR3688 from your location

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

HR3688 is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of HR3688 from the Sun and relative movement

HR3688 is distant 4,346.67 light years from the Sun and it is moving far from the Sun at the speed of 26 kilometers per second.

1,333.33 pc
4,346.67 ly
26 km/s
0.017 arcsec/year
0.009 arcsec/year

Spectral properties of HR3688

HR3688 belongs to spectral class A1 and has a luminosity class of I corresponding to a supergiant star.

-4.58
A1I
7591K

The red dot in the diagram below shows where HR3688 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR3688. Attribution: Richard Powell / CC BY-SA

HR3688 star system properties

HR3688 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 HR3688 double sysyem:

6.04
14.04
8
6.8 arcsec

Alternative designations of HR3688

SAO221010
SAO221010