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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: 6:08  
clear_day Transit: 12:59  
SunsetSet: 19:51
sunny DaytimeWhat's Visible Now?
All Constellations » Capricornus » 

HR7931

Altitude: 4.9°   Azimuth: 212.1°   Direction: South-South-West

HR7931 is a giant star in the constellation of Capricornus.

HR7931 visual magnitude is 6.5. Because of its reltive faintness, HR7931 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 HR7931 is 0.008 arcsec per year in Right Ascension and 0.006 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of HR7931 star
DSS2 image of HR7931. The red arrow shows the motion of HR7931 during the next 100000 years (13.33 arcmin in Right Ascension and 10.00 arcmin in declination);

Key facts about HR7931

6.5
Giant

HR7931 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 4.9°
Azimuth: 212.1°
Direction: South-South-West

Celestial coordinates and finder chart of HR7931

HR7931 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 HR7931 are provided in the following table:

20h 45m 13s
-27° 14’ 49”
17.6°
-35.85°
Capricornus

The simplified sky map below shows the position of HR7931 in the sky:

Finder chart HR7931 star
Simplified finder chart for HR7931.

Visibility of HR7931 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 HR7931 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: 117.2°
Max altitude: 11.3°
Azimuth: 242.8°

Distance of HR7931 from the Sun and relative movement

HR7931 is distant 470.42 light years from the Sun and it is moving towards the Sun at the speed of 3 kilometers per second.

144.30 pc
470.42 ly
-3 km/s
0.008 arcsec/year
0.006 arcsec/year

Spectral properties of HR7931

HR7931 belongs to spectral class G8 and has a luminosity class of III corresponding to a giant star.

0.70
G8III
4892K

The red dot in the diagram below shows where HR7931 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR7931. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7931

SAO189641
SAO189641