HR7807

HR7807 is a variable main-sequence star in the constellation of Cygnus.

HR7807 visual magnitude is 5.9. Because of its reltive faintness, HR7807 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 HR7807:

Color of HR7807 ⬤

Magnitude of HR7807 5.9

Class Main-sequence

VISIBILITY RIGHT NOW HR7807 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of HR7807

HR7807 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 HR7807 are provided in the following table:

Right Ascension J2000 20h 23m 44s

Declination J2000 +37° 28’ 35”

Galactic Longitude 76.04°

Galactic Latitude 0.04°

Constellation Cygnus

The simplified sky map below shows the position of HR7807 in the sky:

Simplified finder chart for HR7807.

Visibility of HR7807 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 HR7807 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: 52.5° RISE 17:40

Max altitude: 76.0° TRANSIT 4:38

Azimuth: 307.5° SET 15:32

RIGHT NOW HR7807 is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR7807

The image below is a photograph of HR7807 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 HR7807 is 0.004 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 HR7807. The red arrow shows the motion of HR7807 during the next 100000 years (6.67 arcmin in Right Ascension and -6.67 arcmin in declination);

Distance of HR7807 from the Sun and relative movement

HR7807 is distant 893.15 light years from the Sun and it is moving towards the Sun at the speed of 30 kilometers per second.

Distance (parsec) 273.97 pc

Distance (light year) 893.15 ly

Heliocentric radial velocity -30 km/s

Proper Motion RA 0.004 arcsec/year

Proper Motion Dec -0.004 arcsec/year

Spectral properties of HR7807

HR7807 belongs to spectral class B2 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -1.29

Spectral Type B2V

Color Index (B-V) -0.2

Temperature of HR7807 13585K

The red dot in the diagram below shows where HR7807 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7807. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7807

Henry Draper Catalogue HD194335

SAO Catalogue SAO69951

Hipparcos Catalogue HIP100574

Durchmusterung Catalogue BD+37 3916

General Catalogue of Variable Stars Var?

In Evidence

Other stars in Cygnus