Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:44  
clear_day Transit: 12:57  
SunsetSet: 21:11 south
wb_twilight Nautical TwilightWhat's Visible Now
All Constellations » Pegasus » 


Altitude: 50.9°   Azimuth: 103.7°   Direction: East-South-East

HR8638 is a star in the constellation of Pegasus.

HR8638 visual magnitude is 6.34. Because of its reltive faintness, HR8638 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 HR8638:


HR8638 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 50.9°
Azimuth: 103.7°
Direction: East-South-East

Celestial coordinates and finder chart of HR8638

HR8638 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 HR8638 are provided in the following table:

22h 41m 31s
+30° 57’ 56”

The simplified sky map below shows the position of HR8638 in the sky:

Finder chart HR8638 star
Simplified finder chart for HR8638.

Visibility of HR8638 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 HR8638 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: 59.0°
Max altitude: 69.5°
Azimuth: 301.0°
HR8638 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR8638

The image below is a photograph of HR8638 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 HR8638 is 0.063 arcsec per year in Right Ascension and 0 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR8638 star
DSS2 image of HR8638. The red arrow shows the motion of HR8638 during the next 10000 years (10.50 arcmin in Right Ascension and 0.00 arcmin in declination);

Distance of HR8638 from the Sun and relative movement

HR8638 is distant 831.63 light years from the Sun and it is moving towards the Sun at the speed of 35 kilometers per second.

255.10 pc
831.63 ly
-35 km/s
0.063 arcsec/year

Spectral properties of HR8638

HR8638 belongs to spectral class K5


The red dot in the diagram below shows where HR8638 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR8638. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR8638