Your Guide to the Solar System and the Night Sky
Donate now! You'll help cover server costs, enhance the site and keep it ad-free.
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:48  
clear_day Transit: 12:56  
SunsetSet: 21:05 south
sunny DaytimeWhat's Visible Now
All Constellations » Vulpecula » 


HR8101 is a double main-sequence star in the constellation of Vulpecula.

HR8101 visual magnitude is 6.68. Because of its reltive faintness, HR8101 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 HR8101:

HR8101 is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 61°.

Celestial coordinates and finder chart of HR8101

HR8101 is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR8101 are provided in the following table:

21h 10m 32s
+22° 27’ 16”

The simplified sky map below shows the position of HR8101 in the sky:

Finder chart HR8101 star
Simplified finder chart for HR8101.

Visibility of HR8101 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 HR8101 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: 67.5°
Max altitude: 61.0°
Azimuth: 292.5°
HR8101 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR8101

The image below is a photograph of HR8101 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 HR8101 is 0.02 arcsec per year in Right Ascension and -0.008 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR8101 star
DSS2 image of HR8101. The red arrow shows the motion of HR8101 during the next 10000 years (3.33 arcmin in Right Ascension and -1.33 arcmin in declination);

Distance of HR8101 from the Sun and relative movement

HR8101 is distant 2,024.84 light years from the Sun and it is moving towards the Sun at the speed of 12 kilometers per second.

621.12 pc
2,024.84 ly
-12 km/s
0.02 arcsec/year
-0.008 arcsec/year

Spectral properties of HR8101

HR8101 belongs to spectral class A1 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR8101 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR8101. Attribution: Richard Powell / CC BY-SA

HR8101 star system properties

HR8101 is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the HR8101 double sysyem:

18 arcsec

Alternative designations of HR8101