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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:46  
clear_day Transit: 12:51  
SunsetSet: 18:55 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Sagittarius » 


Altitude: -40.9°   Azimuth: 307.9°   Direction: North-West

HR7166 is a variable and double sub-giant star in the constellation of Sagittarius.

HR7166 visual magnitude is 5.53. Because of its reltive faintness, HR7166 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 HR7166:


HR7166 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -40.9°
Azimuth: 307.9°
Direction: North-West

Celestial coordinates and finder chart of HR7166

HR7166 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 HR7166 are provided in the following table:

18h 59m 23s
-12° 50’ 26”

The simplified sky map below shows the position of HR7166 in the sky:

Finder chart HR7166 star
Simplified finder chart for HR7166.

Visibility of HR7166 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 HR7166 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: 102.8°
Max altitude: 25.7°
Azimuth: 257.2°

Digitized Sky Survey image of HR7166

The image below is a photograph of HR7166 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 HR7166 is 0.002 arcsec per year in Right Ascension and -0.018 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR7166 star
DSS2 image of HR7166. The red arrow shows the motion of HR7166 during the next 10000 years (0.33 arcmin in Right Ascension and -3.00 arcmin in declination);

Distance of HR7166 from the Sun and relative movement

HR7166 is distant 514.20 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

157.73 pc
514.20 ly
-13 km/s
0.002 arcsec/year
-0.018 arcsec/year

Spectral properties of HR7166

HR7166 belongs to spectral class B5 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where HR7166 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7166. Attribution: Richard Powell / CC BY-SA

HR7166 star system properties

HR7166 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 HR7166 double sysyem:

0.4 arcsec

Alternative designations of HR7166