HR6739

Altitude: 2.0° Azimuth: 170.6° Direction: South

HR6739 is a double giant star in the constellation of Sagittarius.

HR6739 visual magnitude is 6. Because of its reltive faintness, HR6739 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 HR6739:

Color of HR6739 ⬤

Magnitude of HR6739 6

Class Giant

VISIBILITY RIGHT NOW

HR6739 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 2.0°
Azimuth: 170.6°
Direction: South

Celestial coordinates and finder chart of HR6739

HR6739 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 HR6739 are provided in the following table:

Right Ascension J2000 18h 04m 50s

Declination J2000 -35° 54’ 05”

Galactic Longitude 355.99°

Galactic Latitude -7°

Constellation Sagittarius

The simplified sky map below shows the position of HR6739 in the sky:

Simplified finder chart for HR6739.

Visibility of HR6739 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 HR6739 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: 125.9° RISE 17:13

Max altitude: 2.6° TRANSIT 18:51

Azimuth: 234.1° SET 20:29

Digitized Sky Survey image of HR6739

The image below is a photograph of HR6739 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 HR6739 is -0.016 arcsec per year in Right Ascension and -0.035 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR6739. The red arrow shows the motion of HR6739 during the next 10000 years (-2.67 arcmin in Right Ascension and -5.83 arcmin in declination);

Distance of HR6739 from the Sun and relative movement

HR6739 is distant 355.12 light years from the Sun and it is moving towards the Sun at the speed of 16 kilometers per second.

Distance (parsec) 108.93 pc

Distance (light year) 355.12 ly

Heliocentric radial velocity -16 km/s

Proper Motion RA -0.016 arcsec/year

Proper Motion Dec -0.035 arcsec/year

Spectral properties of HR6739

HR6739 belongs to spectral class K2 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude 0.81

Spectral Type K2III

Color Index (B-V) 1.16

Temperature of HR6739 4389K

The red dot in the diagram below shows where HR6739 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR6739. Attribution: Richard Powell / CC BY-SA

HR6739 star system properties

HR6739 is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the HR6739 double sysyem:

Main star magnitude 6

Secondary star magnitude 11.2

Magnitude difference 5.2

Separation 12.5 arcsec

Alternative designations of HR6739

Henry Draper Catalogue HD164870

SAO Catalogue SAO209671

Hipparcos Catalogue HIP88550

Durchmusterung Catalogue CD-3512229

FK5 Catalogue 3435

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In Evidence

Other stars in Sagittarius