Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:44  
clear_day Transit: 12:51  
SunsetSet: 18:57 south
sleep NighttimeWhat's Visible Now
All Constellations » Sagittarius » 


Altitude: 7.7°   Azimuth: 217.3°   Direction: South-West

HR7643 is a main-sequence star in the constellation of Sagittarius.

HR7643 visual magnitude is 6.01. Because of its reltive faintness, HR7643 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 HR7643:


HR7643 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 7.7°
Azimuth: 217.3°
Direction: South-West

Celestial coordinates and finder chart of HR7643

HR7643 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 HR7643 are provided in the following table:

20h 01m 23s
-22° 44’ 13”

The simplified sky map below shows the position of HR7643 in the sky:

Finder chart HR7643 star
Simplified finder chart for HR7643.

Visibility of HR7643 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 HR7643 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: 112.7°
Max altitude: 15.8°
Azimuth: 247.3°

Digitized Sky Survey image of HR7643

The image below is a photograph of HR7643 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 HR7643 is 0.01 arcsec per year in Right Ascension and -0.014 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR7643 star
DSS2 image of HR7643. The red arrow shows the motion of HR7643 during the next 10000 years (1.67 arcmin in Right Ascension and -2.33 arcmin in declination);

Distance of HR7643 from the Sun and relative movement

HR7643 is distant 312.86 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.

95.97 pc
312.86 ly
8 km/s
0.01 arcsec/year
-0.014 arcsec/year

Spectral properties of HR7643

HR7643 belongs to spectral class G7 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR7643 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7643. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7643