HR7917

HR7917 is a double main-sequence star in the constellation of Cygnus.

HR7917 visual magnitude is 6.08. Because of its reltive faintness, HR7917 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 HR7917:

Color of HR7917 ⬤

Magnitude of HR7917 6.08

Class Main-sequence

VISIBILITY RIGHT NOW HR7917 is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 53°.

Celestial coordinates and finder chart of HR7917

HR7917 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 HR7917 are provided in the following table:

Right Ascension J2000 20h 40m 36s

Declination J2000 +29° 48’ 19”

Galactic Longitude 71.9°

Galactic Latitude -7.32°

Constellation Cygnus

The simplified sky map below shows the position of HR7917 in the sky:

Simplified finder chart for HR7917.

Visibility of HR7917 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 HR7917 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: 60.2° RISE 19:57

Max altitude: 68.3° TRANSIT 5:03

Azimuth: 299.8° SET 14:04

RIGHT NOW HR7917 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR7917

The image below is a photograph of HR7917 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 HR7917 is 0.008 arcsec per year in Right Ascension and 0.036 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR7917. The red arrow shows the motion of HR7917 during the next 10000 years (1.33 arcmin in Right Ascension and 6.00 arcmin in declination);

Distance of HR7917 from the Sun and relative movement

HR7917 is distant 267.21 light years from the Sun and it is moving towards the Sun at the speed of 30 kilometers per second.

Distance (parsec) 81.97 pc

Distance (light year) 267.21 ly

Heliocentric radial velocity -30 km/s

Proper Motion RA 0.008 arcsec/year

Proper Motion Dec 0.036 arcsec/year

Spectral properties of HR7917

HR7917 belongs to spectral class A2 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude 1.51

Spectral Type A2V

Color Index (B-V) 0.14

Temperature of HR7917 8658K

The red dot in the diagram below shows where HR7917 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7917. Attribution: Richard Powell / CC BY-SA

HR7917 star system properties

HR7917 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR7917 double sysyem:

Main star magnitude 6.08

Secondary star magnitude 10.58

Magnitude difference 4.5

Separation 0.9 arcsec

Alternative designations of HR7917

Henry Draper Catalogue HD197120

SAO Catalogue SAO88997

Hipparcos Catalogue HIP102033

Durchmusterung Catalogue BD+29 4131

Aitken Double Star Catalogue ADS14149

In Evidence

Other stars in Cygnus