HR8770

HR8770 is a variable and multiple giant star in the constellation of Cassiopeia.

HR8770 visual magnitude is 6.5. Because of its reltive faintness, HR8770 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 HR8770:

Color of HR8770 ⬤

Magnitude of HR8770 6.5

Class Giant

VISIBILITY RIGHT NOW HR8770 is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 67°.

Celestial coordinates and finder chart of HR8770

HR8770 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 HR8770 are provided in the following table:

Right Ascension J2000 23h 02m 43s

Declination J2000 +55° 14’ 11”

Galactic Longitude 107.79°

Galactic Latitude -4.41°

Constellation Cassiopeia

The simplified sky map below shows the position of HR8770 in the sky:

Simplified finder chart for HR8770.

Visibility of HR8770 from your location

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

HR8770 is circumpolar and transits at 06:36 UTC (altitude: 86.2°)

Digitized Sky Survey image of HR8770

The image below is a photograph of HR8770 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 HR8770 is 0.008 arcsec per year in Right Ascension and 0.012 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR8770. The red arrow shows the motion of HR8770 during the next 10000 years (1.33 arcmin in Right Ascension and 2.00 arcmin in declination);

Distance of HR8770 from the Sun and relative movement

HR8770 is distant 722.84 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

Distance (parsec) 221.73 pc

Distance (light year) 722.84 ly

Heliocentric radial velocity -13 km/s

Proper Motion RA 0.008 arcsec/year

Proper Motion Dec 0.012 arcsec/year

Spectral properties of HR8770

HR8770 belongs to spectral class B9 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -0.23

Spectral Type B9III

Color Index (B-V) -0.08

Temperature of HR8770 11247K

The red dot in the diagram below shows where HR8770 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR8770. Attribution: Richard Powell / CC BY-SA

HR8770 star system properties

HR8770 is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the HR8770 double sysyem:

Main star magnitude 6.5

Secondary star magnitude 10.1

Magnitude difference 3.6

Separation 19.5 arcsec

Alternative designations of HR8770

Henry Draper Catalogue HD217833

SAO Catalogue SAO35092

Hipparcos Catalogue HIP113797

Durchmusterung Catalogue BD+54 2900

General Catalogue of Variable Stars V638 Cas

Aitken Double Star Catalogue ADS16474

In Evidence

Other stars in Cassiopeia