We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
A Complete Guide to the Solar System and the Night Sky
Donate now and help us to keep this site free and ad-free!
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:49  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
wb_twilight Astronomical TwilightWhat's Visible Now?
All Constellations » Cygnus » 


Altitude: 3.3°   Azimuth: 22.7°   Direction: North-North-East

HR8157 is a variable bright giant star in the constellation of Cygnus.

HR8157 visual magnitude is 5.83. Because of its reltive faintness, HR8157 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 HR8157:

Bright giant

HR8157 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 3.3°
Azimuth: 22.7°
Direction: North-North-East

Celestial coordinates and finder chart of HR8157

HR8157 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 HR8157 are provided in the following table:

21h 19m 22s
+38° 14’ 14”

The simplified sky map below shows the position of HR8157 in the sky:

Finder chart HR8157 star
Simplified finder chart for HR8157.

Visibility of HR8157 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 HR8157 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: 51.8°
Max altitude: 76.8°
Azimuth: 308.2°

Digitized Sky Survey image of HR8157

The image below is a photograph of HR8157 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 HR8157 is 0.011 arcsec per year in Right Ascension and -0.006 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR8157 star
DSS2 image of HR8157. The red arrow shows the motion of HR8157 during the next 10000 years (1.83 arcmin in Right Ascension and -1.00 arcmin in declination);

Distance of HR8157 from the Sun and relative movement

HR8157 is distant 3,505.38 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.

1,075.27 pc
3,505.38 ly
8 km/s
0.011 arcsec/year
-0.006 arcsec/year

Spectral properties of HR8157

HR8157 belongs to spectral class F1 and has a luminosity class of II corresponding to a bright giant star.


The red dot in the diagram below shows where HR8157 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR8157. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR8157