Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:51  
clear_day Transit: 12:56  
SunsetSet: 21:00 south
sunny DaytimeWhat's Visible Now
All Constellations » Hydra » 


HR4055 is a double main-sequence star in the constellation of Hydra.

HR4055 visual magnitude is 6. Because of its reltive faintness, HR4055 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 HR4055:

HR4055 is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 22°.

Celestial coordinates and finder chart of HR4055

HR4055 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 HR4055 are provided in the following table:

10h 19m 16s
-12° 31’ 41”

The simplified sky map below shows the position of HR4055 in the sky:

Finder chart HR4055 star
Simplified finder chart for HR4055.

Visibility of HR4055 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 HR4055 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: 102.5°
Max altitude: 26.0°
Azimuth: 257.5°
HR4055 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR4055

The image below is a photograph of HR4055 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 HR4055 is -0.014 arcsec per year in Right Ascension and -0.019 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4055 star
DSS2 image of HR4055. The red arrow shows the motion of HR4055 during the next 10000 years (-2.33 arcmin in Right Ascension and -3.17 arcmin in declination);

Distance of HR4055 from the Sun and relative movement

HR4055 is distant 217.19 light years from the Sun and it is moving towards the Sun at the speed of 16 kilometers per second.

66.62 pc
217.19 ly
-16 km/s
-0.014 arcsec/year
-0.019 arcsec/year

Spectral properties of HR4055

HR4055 belongs to spectral class A9 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR4055 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4055. Attribution: Richard Powell / CC BY-SA

HR4055 star system properties

HR4055 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR4055 double sysyem:

0.6 arcsec

Alternative designations of HR4055