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: 6:52  
clear_day Transit: 12:49  
SunsetSet: 18:46 south
sunny DaytimeWhat's Visible Now
All Constellations » Aquila » 


Altitude: 7.3°   Azimuth: 97.8°   Direction: East

HR7717 is a double star in the constellation of Aquila.

HR7717 visual magnitude is 6.27. Because of its reltive faintness, HR7717 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 HR7717:


HR7717 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 7.3°
Azimuth: 97.8°
Direction: East

Celestial coordinates and finder chart of HR7717

HR7717 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 HR7717 are provided in the following table:

20h 12m 35s
+00° 52’ 03”

The simplified sky map below shows the position of HR7717 in the sky:

Finder chart HR7717 star
Simplified finder chart for HR7717.

Visibility of HR7717 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 HR7717 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: 89.1°
Max altitude: 39.4°
Azimuth: 270.9°

Digitized Sky Survey image of HR7717

The image below is a photograph of HR7717 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 HR7717 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 HR7717 star
DSS2 image of HR7717. The red arrow shows the motion of HR7717 during the next 10000 years (1.67 arcmin in Right Ascension and -2.33 arcmin in declination);

Distance of HR7717 from the Sun and relative movement

HR7717 is distant 602.59 light years from the Sun and it is moving towards the Sun at the speed of 19 kilometers per second.

184.84 pc
602.59 ly
-19 km/s
0.01 arcsec/year
-0.014 arcsec/year

Spectral properties of HR7717

HR7717 belongs to spectral class B9 HR7717 is also a CrEuSr chemically peculiar star.


The red dot in the diagram below shows where HR7717 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7717. Attribution: Richard Powell / CC BY-SA

HR7717 star system properties

HR7717 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR7717 double sysyem:

2.8 arcsec

Alternative designations of HR7717