HR6639

HR6639 is a hypergiant star in the constellation of Ophiuchus.

HR6639 visual magnitude is 6.47. Because of its reltive faintness, HR6639 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 HR6639:

Color of HR6639 ⬤

Magnitude of HR6639 6.47

Class Hypergiant

VISIBILITY RIGHT NOW HR6639 is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of HR6639

HR6639 is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR6639 are provided in the following table:

Right Ascension J2000 17h 49m 18s

Declination J2000 +01° 57’ 39”

Galactic Longitude 27.5°

Galactic Latitude 14.7°

Constellation Ophiuchus

The simplified sky map below shows the position of HR6639 in the sky:

Simplified finder chart for HR6639.

Visibility of HR6639 from your location

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

Today's HR6639 rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 88.0° RISE 23:47

Max altitude: 40.5° TRANSIT 5:59

Azimuth: 272.0° SET 12:07

RIGHT NOW HR6639 is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR6639

The image below is a photograph of HR6639 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 HR6639 is -0.025 arcsec per year in Right Ascension and 0.065 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR6639. The red arrow shows the motion of HR6639 during the next 10000 years (-4.17 arcmin in Right Ascension and 10.83 arcmin in declination);

Distance of HR6639 from the Sun and relative movement

HR6639 is distant 341.72 light years from the Sun and it is moving towards the Sun at the speed of 58 kilometers per second.

Distance (parsec) 104.82 pc

Distance (light year) 341.72 ly

Heliocentric radial velocity -58 km/s

Proper Motion RA -0.025 arcsec/year

Proper Motion Dec 0.065 arcsec/year

Spectral properties of HR6639

HR6639 belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.

Absolute magnitude 1.37

Spectral Type K0III

Color Index (B-V) 1.24

Temperature of HR6639 4232K

The red dot in the diagram below shows where HR6639 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR6639. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR6639

Henry Draper Catalogue HD162113

SAO Catalogue SAO122787

Hipparcos Catalogue HIP87224

Durchmusterung Catalogue BD+02 3406

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In Evidence

Other stars in Ophiuchus