HR6684

Altitude: 35.5° Azimuth: 209.2° Direction: South-South-West

HR6684 is a variable sub-giant star in the constellation of Ophiuchus.

HR6684 visual magnitude is 5.82. Because of its reltive faintness, HR6684 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 HR6684:

Color of HR6684 ⬤

Magnitude of HR6684 5.82

Class Sub-giant

VISIBILITY RIGHT NOW

HR6684 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 35.5°
Azimuth: 209.2°
Direction: South-South-West

Celestial coordinates and finder chart of HR6684

HR6684 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 HR6684 are provided in the following table:

Right Ascension J2000 17h 56m 18s

Declination J2000 +00° 40’ 13”

Galactic Longitude 27.16°

Galactic Latitude 12.55°

Constellation Ophiuchus

The simplified sky map below shows the position of HR6684 in the sky:

Simplified finder chart for HR6684.

Visibility of HR6684 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 HR6684 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: 89.3° RISE 12:37

Max altitude: 39.2° TRANSIT 18:39

Azimuth: 270.7° SET 0:40

Digitized Sky Survey image of HR6684

The image below is a photograph of HR6684 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 HR6684 is -0.005 arcsec per year in Right Ascension and 0.003 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

DSS2 image of HR6684. The red arrow shows the motion of HR6684 during the next 100000 years (-8.33 arcmin in Right Ascension and 5.00 arcmin in declination);

Distance of HR6684 from the Sun and relative movement

HR6684 is distant 829.52 light years from the Sun and it is moving towards the Sun at the speed of 17 kilometers per second.

Distance (parsec) 254.45 pc

Distance (light year) 829.52 ly

Heliocentric radial velocity -17 km/s

Proper Motion RA -0.005 arcsec/year

Proper Motion Dec 0.003 arcsec/year

Spectral properties of HR6684

HR6684 belongs to spectral class B2 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude -1.21

Spectral Type B2IV

Color Index (B-V) 0.09

Temperature of HR6684 9125K

The red dot in the diagram below shows where HR6684 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR6684. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR6684

Henry Draper Catalogue HD163472

SAO Catalogue SAO122935

Hipparcos Catalogue HIP87812

Durchmusterung Catalogue BD+00 3813

General Catalogue of Variable Stars V2052 Oph

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In Evidence

Other stars in Ophiuchus