HR6857

HR6857 is a double giant star in the constellation of Ophiuchus.

HR6857 visual magnitude is 5.39. Because of its reltive faintness, HR6857 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 HR6857:

Color of HR6857 ⬤

Magnitude of HR6857 5.39

Class Giant

VISIBILITY RIGHT NOW HR6857 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 38°.

Celestial coordinates and finder chart of HR6857

HR6857 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 HR6857 are provided in the following table:

Right Ascension J2000 18h 19m 09s

Declination J2000 +07° 15’ 34”

Galactic Longitude 35.79°

Galactic Latitude 10.46°

Constellation Ophiuchus

The simplified sky map below shows the position of HR6857 in the sky:

Simplified finder chart for HR6857.

Visibility of HR6857 from your location

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

Today's HR6857 rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 82.7° RISE 0:03

Max altitude: 45.8° TRANSIT 6:41

Azimuth: 277.3° SET 13:16

RIGHT NOW HR6857 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR6857

The image below is a photograph of HR6857 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 HR6857 is -0.047 arcsec per year in Right Ascension and 0.002 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR6857. The red arrow shows the motion of HR6857 during the next 10000 years (-7.83 arcmin in Right Ascension and 0.33 arcmin in declination);

Distance of HR6857 from the Sun and relative movement

HR6857 is distant 146.58 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

Distance (parsec) 44.96 pc

Distance (light year) 146.58 ly

Heliocentric radial velocity -8 km/s

Proper Motion RA -0.047 arcsec/year

Proper Motion Dec 0.002 arcsec/year

Spectral properties of HR6857

HR6857 belongs to spectral class K2 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude 2.13

Spectral Type K2III

Color Index (B-V) 1.07

Temperature of HR6857 4581K

The red dot in the diagram below shows where HR6857 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR6857. Attribution: Richard Powell / CC BY-SA

HR6857 star system properties

HR6857 is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the HR6857 double sysyem:

Main star magnitude 5.39

Secondary star magnitude 12.09

Magnitude difference 6.7

Separation 42.2 arcsec

Alternative designations of HR6857

Henry Draper Catalogue HD168387

SAO Catalogue SAO123353

Hipparcos Catalogue HIP89772

Durchmusterung Catalogue BD+07 3629

Aitken Double Star Catalogue ADS11254

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Other stars in Ophiuchus