HR4557

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:

Color of HR4557 ⬤

Magnitude of HR4557 6.46

Class Main-sequence

VISIBILITY RIGHT NOW 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:

Right Ascension J2000 11h 54m 25s

Declination J2000 -37° 44’ 56”

Galactic Longitude 290.66°

Galactic Latitude 23.76°

Constellation Centaurus

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

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° RISE 19:24

Max altitude: 0.8° TRANSIT 20:18

Azimuth: 232.3° SET 21:11

RIGHT NOW 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.

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.

Distance (parsec) 46.51 pc

Distance (light year) 151.63 ly

Heliocentric radial velocity -12 km/s

Proper Motion RA -0.309 arcsec/year

Proper Motion Dec 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.

Absolute magnitude 3.12

Spectral Type F7V

Color Index (B-V) 0.52

Temperature of HR4557 6300K

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

Main star magnitude 6.46

Secondary star magnitude 7.76

Magnitude difference 1.3

Separation 1.1 arcsec

Alternative designations of HR4557

Henry Draper Catalogue HD103437

SAO Catalogue SAO202926

Hipparcos Catalogue HIP58057

Durchmusterung Catalogue CD-37 7536

Gliese Catalogue Gl 452.2A

In Evidence

Other stars in Centaurus