HR6638

Altitude: -0.9° Azimuth: 305.7° Direction: North-West

HR6638 is a sub-giant star in the constellation of Hercules.

HR6638 visual magnitude is 5.69. Because of its reltive faintness, HR6638 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 HR6638:

Color of HR6638 ⬤

Magnitude of HR6638 5.69

Class Sub-giant

VISIBILITY RIGHT NOW

HR6638 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -0.9°
Azimuth: 305.7°
Direction: North-West

Celestial coordinates and finder chart of HR6638

HR6638 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 HR6638 are provided in the following table:

Right Ascension J2000 17h 48m 24s

Declination J2000 +20° 33’ 56”

Galactic Longitude 45.25°

Galactic Latitude 22.73°

Constellation Hercules

The simplified sky map below shows the position of HR6638 in the sky:

Simplified finder chart for HR6638.

Visibility of HR6638 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 HR6638 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: 69.4° RISE 5:21

Max altitude: 59.1° TRANSIT 13:11

Azimuth: 290.6° SET 21:01

Digitized Sky Survey image of HR6638

The image below is a photograph of HR6638 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 HR6638 is 0.026 arcsec per year in Right Ascension and 0.008 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR6638. The red arrow shows the motion of HR6638 during the next 10000 years (4.33 arcmin in Right Ascension and 1.33 arcmin in declination);

Distance of HR6638 from the Sun and relative movement

HR6638 is distant 250.00 light years from the Sun and it is moving towards the Sun at the speed of 26 kilometers per second.

Distance (parsec) 76.69 pc

Distance (light year) 250.00 ly

Heliocentric radial velocity -26 km/s

Proper Motion RA 0.026 arcsec/year

Proper Motion Dec 0.008 arcsec/year

Spectral properties of HR6638

HR6638 belongs to spectral class G5 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude 1.27

Spectral Type G5IV

Color Index (B-V) 0.94

Temperature of HR6638 4892K

The red dot in the diagram below shows where HR6638 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR6638. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR6638

Henry Draper Catalogue HD162076

SAO Catalogue SAO85429

Hipparcos Catalogue HIP87158

Durchmusterung Catalogue BD+20 3570

FK5 Catalogue 1465

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In Evidence

Other stars in Hercules