HR4579

Altitude: -52.2° Azimuth: 61.7° Direction: East-North-East

HR4579 is a double hypergiant star in the constellation of Hydra.

HR4579 visual magnitude is 6.43. Because of its reltive faintness, HR4579 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 HR4579:

Color of HR4579 ⬤

Magnitude of HR4579 6.43

Class Hypergiant

VISIBILITY RIGHT NOW

HR4579 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -52.2°
Azimuth: 61.7°
Direction: East-North-East

Celestial coordinates and finder chart of HR4579

HR4579 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 HR4579 are provided in the following table:

Right Ascension J2000 11h 58m 54s

Declination J2000 -25° 54’ 32”

Galactic Longitude 288.4°

Galactic Latitude 35.48°

Constellation Hydra

The simplified sky map below shows the position of HR4579 in the sky:

Simplified finder chart for HR4579.

Visibility of HR4579 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 HR4579 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: 115.9° RISE 3:31

Max altitude: 12.6° TRANSIT 6:59

Azimuth: 244.1° SET 10:28

Digitized Sky Survey image of HR4579

The image below is a photograph of HR4579 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 HR4579 is -0.027 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.

DSS2 image of HR4579. The red arrow shows the motion of HR4579 during the next 10000 years (-4.50 arcmin in Right Ascension and -3.17 arcmin in declination);

Distance of HR4579 from the Sun and relative movement

HR4579 is distant 890.71 light years from the Sun and it is moving far from the Sun at the speed of 13 kilometers per second.

Distance (parsec) 273.22 pc

Distance (light year) 890.71 ly

Heliocentric radial velocity 13 km/s

Proper Motion RA -0.027 arcsec/year

Proper Motion Dec -0.019 arcsec/year

Spectral properties of HR4579

HR4579 belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.

Absolute magnitude -0.75

Spectral Type A0V

Color Index (B-V) 0.03

Temperature of HR4579 9766K

The red dot in the diagram below shows where HR4579 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR4579. Attribution: Richard Powell / CC BY-SA

HR4579 star system properties

HR4579 is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the HR4579 double sysyem:

Main star magnitude 6.43

Secondary star magnitude 6.63

Magnitude difference 0.2

Separation 0.2 arcsec

Alternative designations of HR4579

Henry Draper Catalogue HD104039

SAO Catalogue SAO180349

Hipparcos Catalogue HIP58436

Durchmusterung Catalogue CD-25 8963

Aitken Double Star Catalogue ADS8371

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In Evidence

Other stars in Hydra