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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: 6:04  
clear_day Transit: 12:06  
SunsetSet: 18:09
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All Constellations » Sagittarius » 

HR7639

Altitude: -26.5°   Azimuth: 123.1°   Direction: East-South-East

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 skies, while it is not visible at all from skies affected by light pollution.

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);

Key facts about HR7639

6.29
Main-sequence

HR7639 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -26.5°
Azimuth: 123.1°
Direction: East-South-East

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 hemisphere. 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”
359.42°
-30.04°
Sagittarius

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 edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

HR7639 is currently not visible from Greenwich, United Kingdom edit_location_alt

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.

1.62
A2V
8932K

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

SAO229993
SAO229993