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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: 7:54  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sleep NighttimeWhat's Visible Now?
All Constellations » Hydra » 


Altitude: -52.5°   Azimuth: 45.1°   Direction: North-East

HR4040 is a double main-sequence star in the constellation of Hydra.

HR4040 visual magnitude is 6.57. Because of its reltive faintness, HR4040 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 HR4040:


HR4040 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -52.5°
Azimuth: 45.1°
Direction: North-East

Celestial coordinates and finder chart of HR4040

HR4040 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 HR4040 are provided in the following table:

10h 16m 45s
-20° 40’ 14”

The simplified sky map below shows the position of HR4040 in the sky:

Finder chart HR4040 star
Simplified finder chart for HR4040.

Visibility of HR4040 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 HR4040 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: 110.7°
Max altitude: 17.8°
Azimuth: 249.3°

Digitized Sky Survey image of HR4040

The image below is a photograph of HR4040 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 HR4040 is -0.127 arcsec per year in Right Ascension and -0.038 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR4040 star
DSS2 image of HR4040. The red arrow shows the motion of HR4040 during the next 1000 years (-2.12 arcmin in Right Ascension and -0.63 arcmin in declination);

Distance of HR4040 from the Sun and relative movement

HR4040 is distant 332.65 light years from the Sun and it is moving towards the Sun at the speed of 1 kilometers per second.

102.04 pc
332.65 ly
-1 km/s
-0.127 arcsec/year
-0.038 arcsec/year

Spectral properties of HR4040

HR4040 belongs to spectral class F3 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR4040 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4040. Attribution: Richard Powell / CC BY-SA

HR4040 star system properties

HR4040 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR4040 double sysyem:

1.3 arcsec

Alternative designations of HR4040