HR645

HR645 is a variable and double giant star in the constellation of Andromeda.

HR645 visual magnitude is 5.31. Because of its reltive faintness, HR645 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 HR645:

Color of HR645 ⬤

Magnitude of HR645 5.31

Class Giant

VISIBILITY RIGHT NOW HR645 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 20°.

Celestial coordinates and finder chart of HR645

HR645 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 HR645 are provided in the following table:

Right Ascension J2000 02h 13m 36s

Declination J2000 +51° 03’ 56”

Galactic Longitude 135.85°

Galactic Latitude -9.73°

Constellation Andromeda

The simplified sky map below shows the position of HR645 in the sky:

Simplified finder chart for HR645.

Visibility of HR645 from your location

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

HR645 is circumpolar and transits at 14:02 UTC (altitude: 89.6°)

Digitized Sky Survey image of HR645

The image below is a photograph of HR645 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 HR645 is 0.346 arcsec per year in Right Ascension and -0.171 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of HR645. The red arrow shows the motion of HR645 during the next 1000 years (5.77 arcmin in Right Ascension and -2.85 arcmin in declination);

Distance of HR645 from the Sun and relative movement

HR645 is distant 198.90 light years from the Sun and it is moving far from the Sun at the speed of 27 kilometers per second.

Distance (parsec) 61.01 pc

Distance (light year) 198.90 ly

Heliocentric radial velocity 27 km/s

Proper Motion RA 0.346 arcsec/year

Proper Motion Dec -0.171 arcsec/year

Spectral properties of HR645

HR645 belongs to spectral class G8 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude 1.38

Spectral Type G8III

Color Index (B-V) 0.93

Temperature of HR645 4917K

The red dot in the diagram below shows where HR645 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR645. Attribution: Richard Powell / CC BY-SA

HR645 star system properties

HR645 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 HR645 double sysyem:

Main star magnitude 5.31

Secondary star magnitude 9.71

Magnitude difference 4.4

Separation 27.3 arcsec

Alternative designations of HR645

Henry Draper Catalogue HD13530

SAO Catalogue SAO23047

Hipparcos Catalogue HIP10366

Durchmusterung Catalogue BD+50 481

FK5 Catalogue 77

General Catalogue of Variable Stars 747

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Other stars in Andromeda