HR7993

Altitude: 41.6° Azimuth: 324.6° Direction: North-West

HR7993 is a hypergiant star in the constellation of Cepheus.

HR7993 visual magnitude is 6.45. Because of its reltive faintness, HR7993 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 HR7993:

Color of HR7993 ⬤

Magnitude of HR7993 6.45

Class Hypergiant

VISIBILITY RIGHT NOW

HR7993 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 41.6°
Azimuth: 324.6°
Direction: North-West

Celestial coordinates and finder chart of HR7993

HR7993 is situated close to the northern celestial pole and, as such, it is visible for most part of the year from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR7993 are provided in the following table:

Right Ascension J2000 20h 49m 17s

Declination J2000 +64° 02’ 31”

Galactic Longitude 99.94°

Galactic Latitude 12.61°

Constellation Cepheus

The simplified sky map below shows the position of HR7993 in the sky:

Simplified finder chart for HR7993.

Visibility of HR7993 from your location

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

HR7993 is circumpolar and transits at 16:16 UTC (altitude: 77.4°)

Digitized Sky Survey image of HR7993

The image below is a photograph of HR7993 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 HR7993 is -0.006 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 HR7993. The red arrow shows the motion of HR7993 during the next 100000 years (-10.00 arcmin in Right Ascension and -6.67 arcmin in declination);

Distance of HR7993 from the Sun and relative movement

HR7993 is distant 2,566.93 light years from the Sun and it is moving towards the Sun at the speed of 27 kilometers per second.

Distance (parsec) 787.40 pc

Distance (light year) 2,566.93 ly

Heliocentric radial velocity -27 km/s

Proper Motion RA -0.006 arcsec/year

Proper Motion Dec -0.004 arcsec/year

Spectral properties of HR7993

HR7993 belongs to spectral class B0 and has a luminosity class of V corresponding to a hypergiant star.

Absolute magnitude -3.03

Spectral Type B0V

Color Index (B-V) 0.07

Temperature of HR7993 9328K

The red dot in the diagram below shows where HR7993 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR7993. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7993

Henry Draper Catalogue HD198781

SAO Catalogue SAO19051

Hipparcos Catalogue HIP102771

Durchmusterung Catalogue BD+63 1663

FK5 Catalogue 3667

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In Evidence

Other stars in Cepheus