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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: 6:44  
clear_day Transit: 12:10  
SunsetSet: 17:38
sunny DaytimeWhat's Visible Now?
All Constellations » Cepheus » 


Altitude: 69.8°   Azimuth: 299.4°   Direction: West-North-West

HR7940 is a giant star in the constellation of Cepheus.

HR7940 visual magnitude is 6.32. Because of its reltive faintness, HR7940 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 HR7940 is -0.013 arcsec per year in Right Ascension and 0.003 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR7940 star
DSS2 image of HR7940. The red arrow shows the motion of HR7940 during the next 10000 years (-2.17 arcmin in Right Ascension and 0.50 arcmin in declination);

Key facts about HR7940


HR7940 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 69.8°
Azimuth: 299.4°
Direction: West-North-West

Celestial coordinates and finder chart of HR7940

HR7940 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR7940 are provided in the following table:

20h 43m 13s
+57° 06’ 51”

The simplified sky map below shows the position of HR7940 in the sky:

Finder chart HR7940 star
Simplified finder chart for HR7940.

Visibility of HR7940 from your location

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

HR7940 is circumpolar and transits at 10:04 UTC (altitude: 84.4°)

Distance of HR7940 from the Sun and relative movement

HR7940 is distant 6,269.23 light years from the Sun and it is moving towards the Sun at the speed of 15 kilometers per second.

1,923.08 pc
6,269.23 ly
-15 km/s
-0.013 arcsec/year
0.003 arcsec/year

Spectral properties of HR7940

HR7940 belongs to spectral class B2 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR7940 is situated in the HertzsprungÔÇôRussell diagram.

HR Diagram
H-R diagram showing the position of HR7940. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR7940