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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:40  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
sleep NighttimeWhat's Visible Now?
All Constellations » Hydra » 


Altitude: 19.4°   Azimuth: 152.8°   Direction: South-South-East

HR4218 is a multiple hypergiant star in the constellation of Hydra.

HR4218 visual magnitude is 6.67. Because of its reltive faintness, HR4218 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 HR4218:


HR4218 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 19.4°
Azimuth: 152.8°
Direction: South-South-East

Celestial coordinates and finder chart of HR4218

HR4218 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 HR4218 are provided in the following table:

10h 47m 38s
-15° 15’ 42”

The simplified sky map below shows the position of HR4218 in the sky:

Finder chart HR4218 star
Simplified finder chart for HR4218.

Visibility of HR4218 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 HR4218 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: 105.3°
Max altitude: 23.3°
Azimuth: 254.7°

Digitized Sky Survey image of HR4218

The image below is a photograph of HR4218 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 HR4218 is 0.002 arcsec per year in Right Ascension and -0.014 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4218 star
DSS2 image of HR4218. The red arrow shows the motion of HR4218 during the next 10000 years (0.33 arcmin in Right Ascension and -2.33 arcmin in declination);

Distance of HR4218 from the Sun and relative movement

HR4218 is distant 1,963.86 light years from the Sun and it is moving far from the Sun at the speed of 22 kilometers per second.

602.41 pc
1,963.86 ly
22 km/s
0.002 arcsec/year
-0.014 arcsec/year

Spectral properties of HR4218

HR4218 belongs to spectral class A0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where HR4218 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4218. Attribution: Richard Powell / CC BY-SA

HR4218 star system properties

HR4218 is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the HR4218 double sysyem:

74.7 arcsec

Alternative designations of HR4218