HR7808

Altitude: -60.5° Azimuth: 283.8° Direction: West-North-West

HR7808 is a double sub-giant star in the constellation of Sagittarius.

HR7808 visual magnitude is 6.25. Because of its reltive faintness, HR7808 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 HR7808:

Color of HR7808 ⬤

Magnitude of HR7808 6.25

Class Sub-giant

VISIBILITY RIGHT NOW

HR7808 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -60.5°
Azimuth: 283.8°
Direction: West-North-West

Celestial coordinates and finder chart of HR7808

HR7808 is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR7808 are provided in the following table:

Right Ascension J2000 20h 26m 53s

Declination J2000 -37° 24’ 11”

Galactic Longitude 4.46°

Galactic Latitude -34.26°

Constellation Sagittarius

The simplified sky map below shows the position of HR7808 in the sky:

Simplified finder chart for HR7808.

Visibility of HR7808 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 HR7808 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: 127.4° RISE 14:49

Max altitude: 1.1° TRANSIT 15:53

Azimuth: 232.6° SET 16:57

Digitized Sky Survey image of HR7808

The image below is a photograph of HR7808 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 HR7808 is -0.242 arcsec per year in Right Ascension and -0.116 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of HR7808. The red arrow shows the motion of HR7808 during the next 1000 years (-4.03 arcmin in Right Ascension and -1.93 arcmin in declination);

Distance of HR7808 from the Sun and relative movement

HR7808 is distant 129.31 light years from the Sun and it is moving far from the Sun at the speed of 23 kilometers per second.

Distance (parsec) 39.67 pc

Distance (light year) 129.31 ly

Heliocentric radial velocity 23 km/s

Proper Motion RA -0.242 arcsec/year

Proper Motion Dec -0.116 arcsec/year

Spectral properties of HR7808

HR7808 belongs to spectral class K2 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude 3.26

Spectral Type K2IV

Color Index (B-V) 0.97

Temperature of HR7808 4816K

The red dot in the diagram below shows where HR7808 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7808. Attribution: Richard Powell / CC BY-SA

HR7808 star system properties

HR7808 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR7808 double sysyem:

Main star magnitude 6.25

Secondary star magnitude 7.65

Magnitude difference 1.4

Separation 1.1 arcsec

Alternative designations of HR7808

Henry Draper Catalogue HD194433

SAO Catalogue SAO212126

Hipparcos Catalogue HIP100852

Durchmusterung Catalogue CD-3713741

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In Evidence

Other stars in Sagittarius