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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:57  
clear_day Transit: 12:11  
SunsetSet: 17:27
sunny DaytimeWhat's Visible Now?
All Constellations » Ophiuchus » 


Altitude: 2.8°   Azimuth: 256.9°   Direction: West-South-West

HR6439 is a main-sequence star in the constellation of Ophiuchus.

HR6439 visual magnitude is 6.32. Because of its reltive faintness, HR6439 should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The proper motion of HR6439 is 0.04 arcsec per year in Right Ascension and -0.18 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR6439 star
DSS2 image of HR6439. The red arrow shows the motion of HR6439 during the next 1000 years (0.67 arcmin in Right Ascension and -3.00 arcmin in declination);

Key facts about HR6439


HR6439 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 2.8°
Azimuth: 256.9°
Direction: West-South-West

Celestial coordinates and finder chart of HR6439

HR6439 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 HR6439 are provided in the following table:

17h 19m 59s
-05° 55’ 01”

The simplified sky map below shows the position of HR6439 in the sky:

Finder chart HR6439 star
Simplified finder chart for HR6439.

Visibility of HR6439 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 HR6439 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: 95.9°
Max altitude: 32.6°
Azimuth: 264.1°

Distance of HR6439 from the Sun and relative movement

HR6439 is distant 173.96 light years from the Sun and it is moving towards the Sun at the speed of 31 kilometers per second.

53.36 pc
173.96 ly
-31 km/s
0.04 arcsec/year
-0.18 arcsec/year

Spectral properties of HR6439

HR6439 belongs to spectral class G9 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR6439 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR6439. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR6439

Gl 668.1