HR4218

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:

Color of HR4218 ⬤

Magnitude of HR4218 6.67

Class Hypergiant

VISIBILITY RIGHT NOW HR4218 is below the horizon from Greenwich, United Kingdom edit_location_alt.

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:

Right Ascension J2000 10h 47m 38s

Declination J2000 -15° 15’ 42”

Galactic Longitude 263.88°

Galactic Latitude 38.05°

Constellation Hydra

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

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° RISE 14:41

Max altitude: 23.3° TRANSIT 19:19

Azimuth: 254.7° SET 23:57

RIGHT NOW HR4218 is below the horizon from Greenwich, United Kingdom

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.

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.

Distance (parsec) 602.41 pc

Distance (light year) 1,963.86 ly

Heliocentric radial velocity 22 km/s

Proper Motion RA 0.002 arcsec/year

Proper Motion Dec -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.

Absolute magnitude -2.23

Spectral Type A0III

Color Index (B-V) -0.01

Temperature of HR4218 10252K

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

Main star magnitude 6.67

Secondary star magnitude 7.87

Magnitude difference 1.2

Separation 74.7 arcsec

Alternative designations of HR4218

Henry Draper Catalogue HD93526

SAO Catalogue SAO156235

Hipparcos Catalogue HIP52795

Durchmusterung Catalogue BD-14 3186

Aitken Double Star Catalogue ADS7930

In Evidence

Other stars in Hydra