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: 4:43  
clear_day Transit: 12:58  
SunsetSet: 21:12 south
wb_twilight Nautical TwilightWhat's Visible Now
All Constellations » Hydra » 


Altitude: -34.7°   Azimuth: 258.3°   Direction: West-South-West

HR4571 is a variable hypergiant star in the constellation of Hydra.

HR4571 visual magnitude is 6.21. Because of its reltive faintness, HR4571 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 HR4571:


HR4571 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -34.7°
Azimuth: 258.3°
Direction: West-South-West

Celestial coordinates and finder chart of HR4571

HR4571 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 HR4571 are provided in the following table:

11h 57m 03s
-33° 18’ 55”

The simplified sky map below shows the position of HR4571 in the sky:

Finder chart HR4571 star
Simplified finder chart for HR4571.

Visibility of HR4571 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 HR4571 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: 123.3°
Max altitude: 5.2°
Azimuth: 236.7°
HR4571 is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR4571

The image below is a photograph of HR4571 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 HR4571 is -0.055 arcsec per year in Right Ascension and 0.003 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4571 star
DSS2 image of HR4571. The red arrow shows the motion of HR4571 during the next 10000 years (-9.17 arcmin in Right Ascension and 0.50 arcmin in declination);

Distance of HR4571 from the Sun and relative movement

HR4571 is distant 377.75 light years from the Sun and it is moving towards the Sun at the speed of 10 kilometers per second.

115.87 pc
377.75 ly
-10 km/s
-0.055 arcsec/year
0.003 arcsec/year

Spectral properties of HR4571

HR4571 belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.


The red dot in the diagram below shows where HR4571 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4571. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4571