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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: -80.1°   Azimuth: 40.9°   Direction: North-East

HR3661 is a variable and multiple main-sequence star in the constellation of Vela.

HR3661 visual magnitude is 5.57. Because of its reltive faintness, HR3661 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 HR3661 is -0.012 arcsec per year in Right Ascension and 0.002 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3661 star
DSS2 image of HR3661. The red arrow shows the motion of HR3661 during the next 10000 years (-2.00 arcmin in Right Ascension and 0.33 arcmin in declination);

Key facts about HR3661


HR3661 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -80.1°
Azimuth: 40.9°
Direction: North-East

Celestial coordinates and finder chart of HR3661

HR3661 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 HR3661 are provided in the following table:

09h 12m 30s
-43° 36’ 48”

The simplified sky map below shows the position of HR3661 in the sky:

Finder chart HR3661 star
Simplified finder chart for HR3661.

Visibility of HR3661 from your location

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

HR3661 is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of HR3661 from the Sun and relative movement

HR3661 is distant 623.33 light years from the Sun and it is moving far from the Sun at the speed of 15 kilometers per second.

191.20 pc
623.33 ly
15 km/s
-0.012 arcsec/year
0.002 arcsec/year

Spectral properties of HR3661

HR3661 belongs to spectral class B8 and has a luminosity class of V corresponding to a main-sequence star. HR3661 is also a Si chemically peculiar star.


The red dot in the diagram below shows where HR3661 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR3661. Attribution: Richard Powell / CC BY-SA

HR3661 star system properties

HR3661 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR3661 double sysyem:

2.8 arcsec

Alternative designations of HR3661