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: 4:50  
clear_day Transit: 12:56  
SunsetSet: 21:03 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Centaurus » 


HR4557 is a double main-sequence star in the constellation of Centaurus.

HR4557 visual magnitude is 6.46. Because of its reltive faintness, HR4557 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 HR4557:

HR4557 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of HR4557

HR4557 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 HR4557 are provided in the following table:

11h 54m 25s
-37° 44’ 56”

The simplified sky map below shows the position of HR4557 in the sky:

Finder chart HR4557 star
Simplified finder chart for HR4557.

Visibility of HR4557 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 HR4557 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: 127.7°
Max altitude: 0.8°
Azimuth: 232.3°
HR4557 is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR4557

The image below is a photograph of HR4557 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 HR4557 is -0.309 arcsec per year in Right Ascension and 0.06 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR4557 star
DSS2 image of HR4557. The red arrow shows the motion of HR4557 during the next 1000 years (-5.15 arcmin in Right Ascension and 1.00 arcmin in declination);

Distance of HR4557 from the Sun and relative movement

HR4557 is distant 151.63 light years from the Sun and it is moving towards the Sun at the speed of 12 kilometers per second.

46.51 pc
151.63 ly
-12 km/s
-0.309 arcsec/year
0.06 arcsec/year

Spectral properties of HR4557

HR4557 belongs to spectral class F7 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR4557 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4557. Attribution: Richard Powell / CC BY-SA

HR4557 star system properties

HR4557 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR4557 double sysyem:

1.1 arcsec

Alternative designations of HR4557

Gl 452.2A