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


Altitude: -65.1°   Azimuth: 67.1°   Direction: East-North-East

HR3684 is a double giant star in the constellation of Vela.

HR3684 visual magnitude is 4.62. Because of its moderate brightness, HR3684 should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of HR3684 is 0.026 arcsec per year in Right Ascension and -0.01 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3684 star
DSS2 image of HR3684. The red arrow shows the motion of HR3684 during the next 10000 years (4.33 arcmin in Right Ascension and -1.67 arcmin in declination);

Key facts about HR3684


HR3684 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -65.1°
Azimuth: 67.1°
Direction: East-North-East

Celestial coordinates and finder chart of HR3684

HR3684 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 HR3684 are provided in the following table:

09h 15m 45s
-37° 24’ 47”

The simplified sky map below shows the position of HR3684 in the sky:

Finder chart HR3684 star
Simplified finder chart for HR3684.

Visibility of HR3684 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 HR3684 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: 127.4°
Max altitude: 1.1°
Azimuth: 232.6°

Distance of HR3684 from the Sun and relative movement

HR3684 is distant 165.57 light years from the Sun and it is moving far from the Sun at the speed of 6 kilometers per second.

50.79 pc
165.57 ly
6 km/s
0.026 arcsec/year
-0.01 arcsec/year

Spectral properties of HR3684

HR3684 belongs to spectral class F5 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR3684 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR3684. Attribution: Richard Powell / CC BY-SA

HR3684 star system properties

HR3684 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 HR3684 double sysyem:

11.3 arcsec

Alternative designations of HR3684

Gl 339.3