HR4055

HR4055 is a double main-sequence star in the constellation of Hydra.

HR4055 visual magnitude is 6. Because of its reltive faintness, HR4055 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 HR4055:

Color of HR4055 ⬤

Magnitude of HR4055 6

Class Main-sequence

VISIBILITY RIGHT NOW HR4055 is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 22°.

Celestial coordinates and finder chart of HR4055

HR4055 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 HR4055 are provided in the following table:

Right Ascension J2000 10h 19m 16s

Declination J2000 -12° 31’ 41”

Galactic Longitude 255.04°

Galactic Latitude 35.83°

Constellation Hydra

The simplified sky map below shows the position of HR4055 in the sky:

Simplified finder chart for HR4055.

Visibility of HR4055 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 HR4055 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: 102.5° RISE 13:57

Max altitude: 26.0° TRANSIT 18:51

Azimuth: 257.5° SET 23:44

RIGHT NOW HR4055 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR4055

The image below is a photograph of HR4055 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 HR4055 is -0.014 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 HR4055. The red arrow shows the motion of HR4055 during the next 10000 years (-2.33 arcmin in Right Ascension and -3.17 arcmin in declination);

Distance of HR4055 from the Sun and relative movement

HR4055 is distant 217.19 light years from the Sun and it is moving towards the Sun at the speed of 16 kilometers per second.

Distance (parsec) 66.62 pc

Distance (light year) 217.19 ly

Heliocentric radial velocity -16 km/s

Proper Motion RA -0.014 arcsec/year

Proper Motion Dec -0.019 arcsec/year

Spectral properties of HR4055

HR4055 belongs to spectral class A9 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude 1.88

Spectral Type A9V

Color Index (B-V) 0.26

Temperature of HR4055 7726K

The red dot in the diagram below shows where HR4055 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR4055. Attribution: Richard Powell / CC BY-SA

HR4055 star system properties

HR4055 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR4055 double sysyem:

Main star magnitude 6

Secondary star magnitude 7.3

Magnitude difference 1.3

Separation 0.6 arcsec

Alternative designations of HR4055

Henry Draper Catalogue HD89455

SAO Catalogue SAO155894

Hipparcos Catalogue HIP50536

Durchmusterung Catalogue BD-11 2851

In Evidence

Other stars in Hydra