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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: -87.6°   Azimuth: 204.6°   Direction: South-South-West

HR3840 is a main-sequence star in the constellation of Vela.

HR3840 visual magnitude is 5.45. Because of its reltive faintness, HR3840 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 HR3840 is -0.054 arcsec per year in Right Ascension and -0.017 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3840 star
DSS2 image of HR3840. The red arrow shows the motion of HR3840 during the next 10000 years (-9.00 arcmin in Right Ascension and -2.83 arcmin in declination);

Key facts about HR3840


HR3840 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -87.6°
Azimuth: 204.6°
Direction: South-South-West

Celestial coordinates and finder chart of HR3840

HR3840 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 HR3840 are provided in the following table:

09h 37m 12s
-53° 40’ 06”

The simplified sky map below shows the position of HR3840 in the sky:

Finder chart HR3840 star
Simplified finder chart for HR3840.

Visibility of HR3840 from your location

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

HR3840 is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of HR3840 from the Sun and relative movement

HR3840 is distant 233.69 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

71.68 pc
233.69 ly
-13 km/s
-0.054 arcsec/year
-0.017 arcsec/year

Spectral properties of HR3840

HR3840 belongs to spectral class A2 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR3840 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR3840. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3840