HR839

HR839 is a double star in the constellation of Cassiopeia.

HR839 visual magnitude is 6.45. Because of its reltive faintness, HR839 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 HR839:

Color of HR839 ⬤

Magnitude of HR839 6.45

Class

VISIBILITY RIGHT NOW HR839 is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 31°.

Celestial coordinates and finder chart of HR839

HR839 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR839 are provided in the following table:

Right Ascension J2000 02h 51m 45s

Declination J2000 +58° 18’ 52”

Galactic Longitude 138.2°

Galactic Latitude -0.94°

Constellation Cassiopeia

The simplified sky map below shows the position of HR839 in the sky:

Simplified finder chart for HR839.

Visibility of HR839 from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

HR839 is circumpolar and transits at 10:13 UTC (altitude: 83.2°)

Digitized Sky Survey image of HR839

The image below is a photograph of HR839 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 HR839 is -0.066 arcsec per year in Right Ascension and 0.015 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR839. The red arrow shows the motion of HR839 during the next 10000 years (-11.00 arcmin in Right Ascension and 2.50 arcmin in declination);

Distance of HR839 from the Sun and relative movement

HR839 is distant 284.97 light years from the Sun and it is moving towards the Sun at the speed of 5 kilometers per second.

Distance (parsec) 87.41 pc

Distance (light year) 284.97 ly

Heliocentric radial velocity -5 km/s

Proper Motion RA -0.066 arcsec/year

Proper Motion Dec 0.015 arcsec/year

Spectral properties of HR839

HR839 belongs to spectral class A1

Absolute magnitude 1.74

Spectral Type A1

Color Index (B-V) 0.1

Temperature of HR839 9028K

The red dot in the diagram below shows where HR839 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR839. Attribution: Richard Powell / CC BY-SA

HR839 star system properties

HR839 is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the HR839 double sysyem:

Main star magnitude 6.45

Secondary star magnitude 9.25

Magnitude difference 2.8

Separation 192.7 arcsec

Alternative designations of HR839

Henry Draper Catalogue HD17581

SAO Catalogue SAO23662

Hipparcos Catalogue HIP13347

Durchmusterung Catalogue BD+57 651

In Evidence

Other stars in Cassiopeia