Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]


HR7639 is a main-sequence star in the constellation of Sagittarius.

HR7639 visual magnitude is 6.29. Because of its reltive faintness, HR7639 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 HR7639:

HR7639 is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of HR7639

HR7639 is situated south of the celestial equator, as such, it is more easily visible from the southern emisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR7639 are provided in the following table:

20h 01m 26s
-40° 48’ 51”

The simplified sky map below shows the position of HR7639 in the sky:

Finder chart HR7639 star
Simplified finder chart for HR7639.

Visibility of HR7639 from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

HR7639 is currently not visible from Greenwich, United Kingdom [change]

Digitized Sky Survey image of HR7639

The image below is a photograph of HR7639 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 HR7639 is -0.015 arcsec per year in Right Ascension and -0.038 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR7639 star
DSS2 image of HR7639. The red arrow shows the motion of HR7639 during the next 10000 years (-2.50 arcmin in Right Ascension and -6.33 arcmin in declination);

Distance of HR7639 from the Sun and relative movement

HR7639 is distant 279.83 light years from the Sun and it is moving towards the Sun at the speed of 31 kilometers per second.

85.84 pc
279.83 ly
-31 km/s
-0.015 arcsec/year
-0.038 arcsec/year

Spectral properties of HR7639

HR7639 belongs to spectral class A2 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR7639 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7639. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7639