HR7642

Altitude: 3.1° Azimuth: 22.3° Direction: North-North-East

HR7642 is a double sub-giant star in the constellation of Cygnus.

HR7642 visual magnitude is 6.32. Because of its reltive faintness, HR7642 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 HR7642:

Color of HR7642 ⬤

Magnitude of HR7642 6.32

Class Sub-giant

VISIBILITY RIGHT NOW

HR7642 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 3.1°
Azimuth: 22.3°
Direction: North-North-East

Celestial coordinates and finder chart of HR7642

HR7642 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 HR7642 are provided in the following table:

Right Ascension J2000 19h 58m 34s

Declination J2000 +38° 06’ 20”

Galactic Longitude 73.84°

Galactic Latitude 4.54°

Constellation Cygnus

The simplified sky map below shows the position of HR7642 in the sky:

Simplified finder chart for HR7642.

Visibility of HR7642 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 HR7642 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: 51.9° RISE 16:44

Max altitude: 76.6° TRANSIT 4:05

Azimuth: 308.1° SET 15:22

RIGHT NOW HR7642 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR7642

The image below is a photograph of HR7642 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 HR7642 is 0.009 arcsec per year in Right Ascension and -0.004 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

DSS2 image of HR7642. The red arrow shows the motion of HR7642 during the next 100000 years (15.00 arcmin in Right Ascension and -6.67 arcmin in declination);

Distance of HR7642 from the Sun and relative movement

HR7642 is distant 1,762.16 light years from the Sun and it is moving towards the Sun at the speed of 14 kilometers per second.

Distance (parsec) 540.54 pc

Distance (light year) 1,762.16 ly

Heliocentric radial velocity -14 km/s

Proper Motion RA 0.009 arcsec/year

Proper Motion Dec -0.004 arcsec/year

Spectral properties of HR7642

HR7642 belongs to spectral class B5 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude -2.34

Spectral Type B5IV

Color Index (B-V) -0.09

Temperature of HR7642 11407K

The red dot in the diagram below shows where HR7642 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7642. Attribution: Richard Powell / CC BY-SA

HR7642 star system properties

HR7642 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR7642 double sysyem:

Main star magnitude 6.32

Secondary star magnitude 7.42

Magnitude difference 1.1

Separation 1.9 arcsec

Alternative designations of HR7642

Henry Draper Catalogue HD189432

SAO Catalogue SAO69193

Hipparcos Catalogue HIP98320

Durchmusterung Catalogue BD+37 3703

Aitken Double Star Catalogue ADS13198

In Evidence

Other stars in Cygnus